JP2011244228A - Digital broadcast receiving apparatus and digital broadcast receiving method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide detailed operation of a transmitting apparatus and a receiving apparatus that can reproduce an emergency earthquake alert transmitted by digital broadcasting with minimized delay.SOLUTION: A digital broadcast receiving apparatus and a receiving method comprise: a receiving section for receiving a transmission signal; a broadcast demodulation section 105 for demodulating a digital broadcasting signal from the transmission signal received by the receiving section; a determination section 117 for generating and outputting an image signal and an audio signal relating to earthquake motion; a synthesizing section for synthesizing these signals; and a control section 118 for controlling so as to synthesize these signals.

Description

  The present invention relates to a technique for transmitting and receiving emergency information transmitted by digital broadcasting.

  Conventionally, the emergency warning broadcast activation flag included in the digital broadcast transmission signal is monitored, and if the emergency warning broadcast activation flag is “1”, forced service switching or normal energization from the standby state is performed. It is possible to provide emergency warning broadcasts to viewers quickly by shifting to. (See Patent Document 1)

JP 2005-333512 A

  The above-mentioned patent document 1 discloses a reduction in power consumption in a so-called standby state in which emergency alert broadcasting is monitored.

  However, the emergency alert broadcast activated by the emergency alert broadcast activation flag has the emergency alert broadcast signal compressed and encoded on the transmission side, and it has been necessary to perform decompression decoding processing on the receiver side for reproduction. . For this reason, a delay time for compression / decompression has occurred before the emergency warning broadcast is reproduced.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide detailed operations of a transmission device and a reception device capable of reproducing emergency earthquake warnings transmitted by digital broadcasting without delay as much as possible. There is.

  In order to achieve the above object, for example, the configuration described in the claims is adopted.

  According to the present invention, when it is necessary to issue an earthquake early warning, a transmission method and a reception device having a transmission method and a reception method capable of reproducing the emergency earthquake early warning on the receiver side without delay as much as possible. Can be provided.

It is a block diagram which shows the structure of the digital broadcast receiver which can receive the earthquake motion warning information which concerns on the 1st Embodiment of this invention. It is a block diagram which shows one Example of the digital broadcast transmitter which transmits the digital broadcast which the digital broadcast receiver of this invention receives. It is explanatory drawing which shows the structure of the earthquake motion warning information received with the earthquake motion warning information receiving part 120 which is the main blocks of this invention. It is explanatory drawing which shows the structure of the earthquake motion warning information received with the earthquake motion warning information receiving part 120 which is the main blocks of this invention. It is explanatory drawing which shows the structure of the earthquake motion warning information received with the earthquake motion warning information receiving part 120 which is the main blocks of this invention. It is explanatory drawing which shows the structure of the earthquake motion warning information received with the earthquake motion warning information receiving part 120 which is the main blocks of this invention. It is explanatory drawing which shows the structure of the earthquake motion warning information received with the earthquake motion warning information receiving part 120 which is the main blocks of this invention. It is explanatory drawing which shows operation | movement description of the earthquake motion warning information received with the earthquake motion warning information receiving part 120 which is the main block of this invention. It is explanatory drawing which shows the structure of the earthquake motion warning information received with the earthquake motion warning information receiving part 120 which is the main blocks of this invention. It is explanatory drawing which shows the structure of the earthquake motion warning information received with the earthquake motion warning information receiving part 120 which is the main blocks of this invention. It is explanatory drawing which shows the structure of the earthquake motion warning information received with the earthquake motion warning information receiving part 120 which is the main blocks of this invention. It is explanatory drawing which shows the structure of the earthquake motion warning information received with the earthquake motion warning information receiving part 120 which is the main blocks of this invention. It is explanatory drawing which shows the structure of the TMCC signal received in the TMCC decoding part 113 which is a main block of this invention. It is explanatory drawing which shows the structure of the TMCC information received in the TMCC decoding part 113 which is a main block of this invention. It is explanatory drawing which shows the structure of the TMCC information received in the TMCC decoding part 113 which is a main block of this invention. It is explanatory drawing which shows the structure of the TMCC information received in the TMCC decoding part 113 which is a main block of this invention. It is explanatory drawing which shows one Example of transmission operation | movement of the TMCC signal received by the TMCC decoding part 113 which is the main blocks of this invention, and a reception operation | movement. It is explanatory drawing which shows one Example of transmission operation | movement of the TMCC signal received in the TMCC decoding part 113 which is the main block of this invention, and the earthquake motion warning information received by the earthquake motion warning information receiving part 120. It is explanatory drawing which shows one Example of transmission operation | movement of the TMCC signal received in the TMCC decoding part 113 which is the main block of this invention, and the earthquake motion warning information received by the earthquake motion warning information receiving part 120. It is explanatory drawing which shows one Example of transmission operation | movement of the TMCC signal received in the TMCC decoding part 113 which is the main block of this invention, and the earthquake motion warning information received by the earthquake motion warning information receiving part 120. It is explanatory drawing which shows one Example of transmission operation | movement of the TMCC signal received by the TMCC decoding part 113 which is the main blocks of this invention, and the earthquake motion warning information received by the earthquake motion warning information receiving part 120, and the receiving operation of this invention. It is explanatory drawing which shows one Example of transmission operation | movement of the TMCC signal received by the TMCC decoding part 113 which is the main blocks of this invention, and the earthquake motion warning information received by the earthquake motion warning information receiving part 120, and the receiving operation of this invention. It is explanatory drawing which shows one Example of transmission operation | movement of the TMCC signal received by the TMCC decoding part 113 which is the main blocks of this invention, and the earthquake motion warning information received by the earthquake motion warning information receiving part 120, and the receiving operation of this invention. It is explanatory drawing which shows one Example of transmission operation | movement of the TMCC signal received by the TMCC decoding part 113 which is the main blocks of this invention, and the earthquake motion warning information received by the earthquake motion warning information receiving part 120, and the receiving operation of this invention. It is a block diagram which shows one Example of the discrimination | determination part 117 which is a main block of the 1st Embodiment of this invention. It is a block diagram which shows the structure of the digital broadcast receiver which can receive the seismic-motion warning information which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows one Example of the decoding part 108 and the synthetic | combination parts 2601 and 2602 which are the main blocks of the 2nd Embodiment of this invention. It is a block diagram which shows one Example of the decoding part and the synthetic | combination part 2602 which are the main blocks of the 3rd Embodiment of this invention. It is a block diagram which shows the structure of the digital broadcast receiver which can receive the seismic-motion warning information which concerns on the 4th Embodiment of this invention. It is a block diagram which shows one Example of the discrimination | determination part 117 and the output part 2901 which are the main blocks of the 4th Embodiment of this invention. It is explanatory drawing of the digital broadcast transmitted with the digital broadcast transmission apparatus of this invention. It is explanatory drawing of the digital broadcast transmitted with the digital broadcast transmission apparatus of this invention. It is explanatory drawing which shows one Example of the receiver operation | movement which receives the AC signal added to the digital broadcast transmitted with the digital broadcast transmitter of this invention, and an AC signal. It is explanatory drawing which shows one Example of the receiver operation | movement which receives the AC signal added to the digital broadcast transmitted with the digital broadcast transmitter of this invention, and an AC signal. It is explanatory drawing which shows one Example of the receiver operation | movement which receives the AC signal added to the digital broadcast transmitted with the digital broadcast transmitter of this invention, and an AC signal. It is explanatory drawing which shows one Example of the receiver operation | movement which receives the AC signal added to the digital broadcast transmitted with the digital broadcast transmitter of this invention, and an AC signal. It is explanatory drawing which shows one Example of the AC signal added to the digital broadcast transmitted with the digital broadcast transmission apparatus of this invention. It is explanatory drawing which shows one Example of the AC signal added to the digital broadcast transmitted with the digital broadcast transmission apparatus of this invention. It is explanatory drawing which shows one Example of the AC signal added to the digital broadcast transmitted with the digital broadcast transmission apparatus of this invention. It is explanatory drawing which shows one Example of the AC signal added to the digital broadcast transmitted with the digital broadcast transmission apparatus of this invention. It is explanatory drawing which shows one Example of the AC signal added to the digital broadcast transmitted with the digital broadcast transmission apparatus of this invention. It is explanatory drawing which shows one Example of the AC signal added to the digital broadcast transmitted with the digital broadcast transmission apparatus of this invention. It is explanatory drawing which shows one Example of the AC signal added to the digital broadcast transmitted with the digital broadcast transmission apparatus of this invention. It is explanatory drawing which shows one Example of the AC signal added to the digital broadcast transmitted with the digital broadcast transmission apparatus of this invention. It is explanatory drawing which shows one Example of the AC signal added to the digital broadcast transmitted with the digital broadcast transmission apparatus of this invention.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In the drawings, the same reference numerals indicate the same or corresponding parts. Further, the present invention is not limited to the illustrated example.

  FIG. 1 is a block diagram showing the configuration of a digital broadcast receiving apparatus that receives earthquake motion warning information transmitted using an AC signal included in segment number # 0 in Embodiment 1 according to the present invention.

  FIG. 2 is a block diagram showing an embodiment of a digital broadcast transmitting apparatus for transmitting a digital broadcast received by the digital broadcast receiving apparatus of the present invention.

  In this digital broadcasting system, a plurality of MPEG-2 transport streams (hereinafter referred to as TS) are re-multiplexed into one TS, subjected to transmission path encoding processing, and then subjected to IFFT (Inverse Fast The signals are collectively converted into an OFDM (Orthogonal Frequency Division Multiplexing) transmission signal composed of a plurality of subcarriers by Fourier Transform and transmitted as a broadcast wave.

  Here, the OFDM transmission signal in this digital broadcasting system has a configuration in which 13 OFDM segments obtained by dividing a transmission bandwidth of 6 MHz into 14 parts are connected, and hierarchical transmission of up to three layers is possible in units of OFDM segments. It has become. In addition, among the 13 segments of the OFDM transmission signal, the central segment (segment number # 0) can be set as a partial reception layer assuming reception by a mobile receiver such as a mobile phone. FIG. 31 shows the segment structure. A receiver that can receive all 13 segments of the OFDM transmission signal is called a 13-segment receiver, and a receiver that can receive one central segment of the OFDM transmission signal is called a one-segment receiver.

  In this digital broadcasting system, TMCC (Transmission and Multiplexing Configuration) that transmits control information for smooth demodulation of the receiver, such as system identification, transmission parameter switching index, emergency warning broadcast activation flag, transmission parameters of each layer, etc. Control) signal and an AC (Auxiliary Channel) signal that is an extension signal for transmitting additional information related to transmission control of the modulated wave. This frame configuration is shown in FIG. In FIG. 32, the carrier positions and the number of carriers of TMCC signals and AC signals added as OFDM subcarriers differ depending on transmission parameters. Details will be described later.

  Here, an emergency warning system (EWS: Emergency Warning System) activated by an emergency warning broadcast activation flag transmitted by TMCC refers to emergency information to viewers when a tsunami warning due to the occurrence of an earthquake is issued. It is used to inform more quickly. When operating the emergency alert broadcast, the broadcast station sets the emergency alert broadcast activation flag included in the TMCC signal to “ON” and broadcasts the content with the content that can be recognized as the emergency alert broadcast.

  Further, as a system for transmitting more advanced emergency information, there is an earthquake early warning (EEW) announced by the Japan Meteorological Agency. The Earthquake Early Warning is a method for immediately estimating the magnitude of an epicenter or earthquake by analyzing initial microtremors (so-called P waves) and main motions (so-called S waves) captured by a seismometer near the epicenter immediately after the occurrence of the earthquake. This is information that estimates the seismic intensity of major motions in each location based on the information and informs it as quickly as possible. In addition, the Earthquake Early Warning is intended to ensure the safety of the viewer without panicking according to the surrounding situation by notifying the viewer before a strong shake arrives. This earthquake early warning is transmitted using an AC signal included in segment number # 0.

  In general, the name “Earthquake Early Warning” is used, but in the ministerial ordinance notification, the name “earthquake motion warning information” is used, and “earthquake motion warning information” will be used in the future.

  The seismic motion warning information is information related to seismic motion warning performed in accordance with the provisions of Article 13, Paragraph 1 of the Meteorological Business Law (Act No. 165 of 1974).

  The operation of the digital transmission / transmission apparatus that realizes the present digital broadcasting system will be described with reference to FIG.

  201 is an information source encoding unit, 202 is an MPEG2 multiplexing unit, 203 is a TS remultiplexing unit, 204 is an RS (Reed-Solomon) encoding unit, and 205 is a layer division unit. Reference numeral 206 denotes a parallel processing unit, which includes three systems a, b, and c. 207 is a hierarchical synthesis unit, 208 is a time interleaving unit, 209 is a frequency interleaving unit, 210 is an OFDM frame configuration unit, 211 is an inverse fast Fourier transform (hereinafter IFFT) unit, 212 is a guard interval addition unit, 213 is a transmission unit, 214 is a pilot signal component, 215 is a TMCC signal component, and 216 is an AC signal component.

  In this digital broadcasting system, a transport stream (TS) defined by MPEG2 Systems is converted into one TS by re-multiplexing one or a plurality of inputs, and after a plurality of transmission path encodings are performed according to the service intention, Finally, it is transmitted as one OFDM signal. The transmission spectrum of television broadcasting is formed by connecting 13 OFDM blocks (hereinafter referred to as OFDM segments) obtained by dividing the channel bandwidth of television broadcasting into 14 equal parts. By structuring the carrier configuration of the OFDM segment so that a plurality of segments can be connected, a transmission bandwidth suitable for media can be realized in segment width units. Since channel coding is performed in units of OFDM segments, a part of one television channel can be a fixed reception service and the rest can be a mobile reception service. Such transmission is defined as hierarchical transmission. Each layer is configured by one or a plurality of OFDM segments, and parameters such as a carrier modulation scheme, an inner code coding rate, and a time interleave length can be set for each layer. The number of possible layers is up to 3 levels, and partial reception is also counted as one layer. The number of segments and transmission path coding parameters in each layer are determined according to the organization information, and are transmitted by the TMCC signal as control information for assisting the operation of the receiver. For the OFDM segment at the center of a television broadcast signal composed of 13 segments, transmission path coding can be performed for frequency interleaving only within that segment. Thereby, a part of television service can be partially received.

  Considering the adaptability to the inter-station distance of SFN or the resistance to Doppler shift in mobile reception, this digital broadcasting system has three different OFDM carrier intervals. These are identified as system modes. The carrier interval is about 4 kHz in mode 1, about 2 kHz in mode 2, and about 1 kHz in mode 3. Although the number of carriers varies depending on the mode, the information bit rate that can be transmitted in any mode is the same.

  The information source encoding unit 201 encodes the video signal, the audio signal, and the data, respectively, and the MPEG2 multiplexing unit 202 generates one TS. The plurality of TSs output from the plurality of MPEG2 multiplexing units are input to the TS remultiplexing unit 203 so as to have an arrangement suitable for signal processing in units of data segments. In the TS re-multiplexing unit 203, it is converted into a burst signal format of 188 bytes by a clock that is four times the IFFT sample clock, and a Reed-Solomon outer code is added and converted into a single TS by the RS encoding unit 204. The After that, when performing hierarchical transmission, the hierarchical division unit 205 divides the hierarchy according to the designation of the hierarchical information, and inputs it to a maximum of three parallel processing units 206a, 206b, 206c. In the parallel processing units 206a, 206b, and 206c, digital data processing such as error correction coding and interleaving, and carrier modulation are mainly performed, respectively. In addition, a delay correction is performed in advance for a delay time difference between hierarchies caused by a time axis operation of byte interleaving and bit interleaving, thereby adjusting timing. Error correction, interleave length, and carrier modulation scheme are set independently in each layer. After parallel processing in the parallel processing units 206a, 206b, and 206c, the signal layered by the layer combining unit 207 effectively demonstrates error correction coding capability against electric field fluctuations and multipath interference in mobile reception. For this purpose, the data is input to the time interleaving unit 208 and the frequency interleaving unit 209. The time interleaving method is convolutional interleaving in order to shorten the combined delay time and suppress the memory capacity of the receiver. Further, the frequency interleave unit is configured by combining inter-segment and inter-segment interleaving so that a sufficient interleaving effect can be exhibited while ensuring a segment structure.

  A TMCC (Transmission and Multiplexing Configuration Control) signal is transmitted using a specific carrier as control information in order to assist demodulation and decoding of the receiver for hierarchical transmission in which a plurality of transmission parameters are mixed. Also, an AC (Auxiliary Channel) signal assigned to a specific carrier is used to transmit additional information related to broadcasting.

  In OFDM frame configuration section 210, information data from frequency interleaving section 209, pilot signal for synchronous reproduction from pilot signal configuration section 214, TMCC signal from TMCC configuration section 215, and AC signal from AC signal configuration section 216 are used. An OFDM frame is constructed. This frame configuration is shown in FIG. Si, j represents a carrier symbol in the data segment after interleaving. SP (Scattered Pilot) is a reference pilot symbol for the receiver to perform quasi-synchronous detection. As shown in FIG. 32, it is inserted once in 12 carriers in the carrier direction and once in 4 symbols in the symbol direction. If SP is interpolated in the symbol direction on the receiving side, SP of 3 (12/4) carrier interval can be obtained. Since the maximum value of the guard interval length is 1/4 of the effective symbol length, multipath up to the maximum delay time that does not cause intersymbol interference is achieved by interpolation processing (transmission path characteristics estimation) by SP of 3 carrier intervals. Is possible. When the guard interval ratio is 1/4, an SP of 4 carrier intervals may be used in principle, but it is inserted once in 4 symbols in the symbol direction in consideration of the characteristics of the interpolation filter.

  The example in FIG. 32 is mode 1, but the carrier numbers in mode 1 are 0 to 107, whereas in modes 2 and 3, they are 0 to 215 and 0 to 431, respectively.

  The AC signal is arranged as shown in FIG. 32 and has a data amount of 204 bits per carrier. In addition, two AC signals are arranged for each segment in mode 1, four in mode 2, and eight in mode 3.

  The TMCC signal is arranged as shown in FIG. 32 and has a data amount of 204 bits per carrier. Further, one TMCC signal is arranged for each segment in mode 1, two in mode 2, and four in mode 3.

  All signals after the frame configuration are converted into OFDM signals by IFFT operation of IFFT section 211, guard intervals are added by guard interval adding section 212 and converted to OFDM transmission signals, and digital broadcasting at a frequency determined by transmitting section 213 Converted to a signal.

  Next, the operation of the digital broadcast receiving apparatus that receives a transmission signal transmitted by the digital broadcast transmitting apparatus of FIG. 2 will be described with reference to FIG.

  101 is an antenna, 102 is a channel selection unit, 103 is an orthogonal demodulation unit, 104 is a fast Fourier transform (hereinafter referred to as FFT) unit, 105 is a demodulation and decoding operation that performs demodulation and decoding operations of the present digital broadcasting system from the FFT unit 104 to the TS output. , 106 is a descrambling unit, 107 is a demux unit, 108 is a compressed broadcast video signal, a compressed broadcast audio signal decoding unit, 114 and 115 are switching units, and 109 is decoded via the switching unit 114 A video output unit for displaying a broadcast video signal, 110 is an audio output unit for outputting a broadcast audio signal decoded via the switching unit 115, and these are mainstream blocks for reproducing the broadcast video signal and the broadcast audio signal. It is. Reference numeral 111 denotes a synchronous reproduction unit, 112 denotes a frame extraction unit, and 113 denotes a TMCC decoding unit, which performs synchronous signal reproduction for performing the operation of the demodulation decoding unit 105 and obtains information such as transmission parameters. The channel selection unit 102, the TMCC decoding unit 113, and the switching units 114 and 115 constitute a broadcast receiving unit 119.

  On the other hand, 116 is an AC decoding unit, and 117 is a discrimination unit. These components constitute the earthquake motion warning information receiving unit 120.

  The switching units 114 and 115 switch the video signal and audio signal of the decoding unit 108 and the determination unit 117, respectively.

  Reference numeral 118 denotes a control unit that performs operation control and power control of the broadcast receiving unit 119 and the earthquake motion warning information receiving unit 120.

  The control part 118, the broadcast receiving part 119, and the earthquake motion warning information receiving part 120 constitute a digital broadcast receiving apparatus 121.

  Hereinafter, the operation will be described in detail. The channel frequency band to be received by the channel selection unit 102 is extracted from the digital broadcast received by the antenna 101, the UHF television broadcast channel is designated, and the signal selected by the orthogonal demodulation unit 103 is orthogonally demodulated into a baseband signal. The FFT unit 104 converts the frequency axis processing, and FFT is performed for a period corresponding to an effective symbol among the OFDM symbols. At that time, the multipath situation of the received signal is taken into consideration, and the FFT processing is performed in an appropriate period. In response, the demodulation / decoding unit 105 performs demodulation processing on each carrier on the frequency axis (for example, synchronous demodulation using scattered pilots (SP: see FIG. 32) for QPSK, 16QAM, and 64QAM). Frequency and time axis deinterleaving and demapping, dividing into each layer, bit deinterleaving, depuncturing, byte deinterleaving, energy despreading, Viterbi decoding and Error correction such as RS (Reed-Solomon) decoding is performed and the digital broadcast signal is demodulated. For example, a transport stream (hereinafter abbreviated as TS) signal defined by MPEG2 Systems is output to the descrambling unit 106. . The descramble unit 106 scrambles the TS signal that has been scrambled for copyright protection, and outputs the descrambled signal to the demax unit 107. In the demux unit 107, a desired compressed broadcast video signal and a compressed digital signal of the broadcast audio signal are extracted and output to the decoding unit 108. The decoding unit 108 decodes the compressed broadcast video signal and the compressed broadcast audio signal, the decoded broadcast video signal is sent to the video output unit 109 via the switching unit 114, and the decoded broadcast audio signal is the switching unit 115. Is output to the audio output unit 110.

  On the other hand, the synchronization reproduction unit 111 receives the baseband signal from the orthogonal demodulation unit 103 and reproduces the OFDM symbol synchronization signal and the FFT sample frequency according to the mode and the guard interval length. When the mode and the guard interval length are unknown, the mode and guard interval length can also be determined based on the correlation of the guard period of the OFDM signal. Further, the frequency position of the TMCC signal is detected from the output signal of the FFT unit 104. The frame extraction unit 112 demodulates the TMCC signal at the detected frequency position and extracts a frame synchronization signal from the TMCC signal. The frame synchronization signal is output to the synchronization reproduction unit 111, and phase adjustment with the symbol synchronization signal is performed. The TMCC decoding unit 113 performs error correction of the differential cyclic code on the demodulated TMCC signal, and extracts TMCC information such as a hierarchical structure and transmission parameters. The TMCC information is output to the demodulation / decoding unit 105 and used as various control information for the demodulation / decoding process.

  The earthquake motion warning information receiving unit 120 includes an AC decoding unit 116 and a discrimination unit 117. The AC decoding unit 116 extracts the seismic motion warning information when the configuration identification of the AC signal of the segment No. 0 of the FFT output indicates that the seismic motion warning information is transmitted (“001”, “110”: described later). . If the configuration identification is other than that, the AC signal is not decoded. The extracted seismic motion warning information is discriminated by the discriminating unit 117, and when the seismic motion warning is to be issued, the information is converted into a video signal or an audio signal. The video signal is sent to the video output unit 109 via the switching unit 114. The audio signal is output to the audio output unit 110 via the switching unit 115.

  The control unit 118 controls the switching units 114 and 115 when the emergency warning broadcast activation flag information from the TMCC decoding unit 113 and the seismic motion warning information from the seismic motion warning information receiving unit 120 are input and the seismic motion warning should be issued. Then, the video signal for the earthquake motion warning is output to the video output unit 109, and the audio signal for the earthquake motion warning is output to the audio output unit 110.

  Next, the configuration of the earthquake motion warning information that is configured by the AC signal configuration unit 216 and received by the earthquake motion warning information reception unit 120 will be described using FIGS. 3 to 12.

  The AC signal is an additional information signal related to broadcasting. Additional information related to broadcasting refers to additional information related to transmission control of modulated waves or earthquake motion warning information. Earthquake motion warning information is transmitted using the segment No. 0 AC carrier. The AC signal is arranged as shown in FIG. 32 and has a data amount of 204 bits per carrier.

  FIG. 3 shows the bit assignment of 204 bits B0 to B203 of the AC signal arranged in segment No.0.

  One bit of B0 is used as a reference for differential demodulation. The 3 bits from B1 to B3 are used as configuration identification to distinguish whether it is additional information or earthquake motion warning information. Additional information or earthquake motion warning information is sent out by 200 bits B4 to B203. When transmitting earthquake motion warning information, the same ground motion warning information is transmitted on all AC carriers in segment No. 0. By using the same seismic motion warning information for all AC carriers in segment No. 0, seismic motion warning information transmitted on different AC carriers can be analog-added on the receiver side, so that even smaller CN ratios can be received. .

  FIG. 4 shows a reference for differential demodulation of B0. The modulation method of the AC carrier is DBPSK, and the amplitude and phase reference for differential demodulation are given by Wi in FIG.

  FIG. 5 shows bit allocation when the seismic motion warning information is transmitted by the AC signal of segment No. 0.

  When the configuration identification is 000,010,011,100,101,111, the AC is used for broadcasters as usual, and transmits additional information related to transmission control of modulated waves.

  When the configuration identification is 001, 110, earthquake motion warning information is transmitted.

  ‘001’ and ‘110’ representing the transmission of the earthquake motion warning information have the same code as the first 3 bits (B1 to B3) of the TMCC synchronization signal, and are alternately transmitted for each frame at the same timing as the TMCC signal.

  The 13 bits of B4 to B16 are used as synchronization signals.

  In the case of the earthquake motion warning information, the code obtained by concatenating the configuration identification and the synchronization signal is the same code as the TMCC synchronization signal, and is composed of a 16-bit word. There are two kinds of synchronization signals: w0 = 0011010111101110 and w1 = 1100101000010001 obtained by bit-inverting it. The same bits as the TMCC synchronization signals (B1 to B16) are allocated, and w0 and w1 are alternately transmitted for each frame at the same timing to transmit the same code as TMCC. Since analog addition can be performed between the TMCC and the AC signal, the reception sensitivity of frame synchronization in the receiver can be improved.

  The two bits B17 to B18 are used as the start / end flag of the earthquake motion warning information.

  FIG. 6 shows the meaning of the start / end flag of the earthquake motion warning information.

  When the earthquake motion warning information is issued, 2 bits are assigned as a start / end flag of the earthquake motion warning information in order to indicate that the receiver is automatically activated and the earthquake motion warning information is transmitted by an AC signal.

  In the AC signal, when there is no information to be transmitted, all bits are modulated with ‘1’, so that the start / end flag when representing the seismic motion warning detailed information or its test signal is set to ‘00’. In addition, in order to improve the reliability of the start / end flag, 2 bits are used for the start / end flag, and the inverted signal has the maximum intersymbol distance. Also, “10” and “01” are not used in order to ensure the reliability of the start / end flag.

  When transmission of earthquake alarm information is started, the start / end flag is changed from '11' to '00'. When the transmission of the earthquake motion warning information is finished, the start / end flag is changed from “00” to “11”. The start / end flag can be used as an activation signal for the receiver.

  The two bits B19 to B20 are used as an update flag.

  FIG. 7 shows the meaning of the earthquake motion warning information update flag.

  The signal identification (B21 to B23) or the contents of the earthquake motion information (B56 to B111) shown in FIG. 10 (described later) is updated while the value of the start / end flag of the earthquake motion warning information is “00”. 7 increments the value of the update flag by 1 as shown in FIGS. 7 and 8, and notifies the receiver that the signal identification or the earthquake motion information has been updated.

  The update flag is incremented by 1 each time a change occurs in the details of the series of seismic motion warning details transmitted when the start / end flag is '00', '00' is the start value, and '11' Next to, it shall return to '00'. When the start / end flag is “11”, the update flag is set to “11”.

  An example of sending the update flag is shown in FIG. The first report, the second report,... Show the state where the signal identification shown in FIG. 9 (described later) or the contents of the earthquake motion information shown in FIG. Even if the current time or page type shown in FIG. 10 (described later) changes, the value of the update flag does not change.

  The three bits B21 to B23 are used for signal identification.

  FIG. 9 shows the meaning of signal identification.

  The signal identification of earthquake motion warning information is a signal used to identify the type of earthquake motion warning detailed information. When the start / end flag is '00', signal identification '000' / '001' / '010' / '011' is transmitted, and when the start / end flag is '11', signal identification '111' Is sent out. Also, the seismic motion warning detailed test signal (with / without corresponding area) and the seismic motion warning detailed information (with / without corresponding area) are not sent simultaneously.

  The signal identifications '100' / '101' / '110' are for future expansion and are all set to '1'.

  As shown in FIG. 12 (described later), the total number of earthquake motion information can be sent up to two, but the test signal and this signal are not sent simultaneously. In addition, when transmitting ground motion information with and without the signal identification at the same time, send the information as ground motion information with the corresponding region, so that at least one earthquake motion information is in the corresponding region. Can be promptly notified to the receiver.

  The 88 bits from B24 to B111 are detailed detailed information on earthquake motion warning.

  FIG. 10 shows the details. Bit allocation of detailed information on earthquake motion warning is specified for each signal identification.

  First, detailed information on earthquake motion warning when the signal identification is '000' / '001' / '010' / '011' is shown.

For the current time, the number of seconds that have elapsed since a reference year / month / day / hour / minute / second is specified in binary notation, and the lower 31 bits are assigned MSB first. When transmitting earthquake motion warning information, in a receiver that supports automatic startup with time adjustment by TOT (Time Offset Table) or communication line, etc., by collating the time of the receiver with the time information sent,
The reliability of the received earthquake motion warning information can be confirmed.

  In the seismic motion information, the allocation of information to be transmitted differs depending on the page type code. The receiver can know which information is transmitted by checking the page type. When the page type is “0”, as shown in FIG. 11 (described later), information indicating the target area of the earthquake motion warning is transmitted. When the page type is ‘1’, information on the earthquake motion alarm source is transmitted as shown in FIG. 12. However, the seismic motion information of both page types “0” and “1” is not necessarily transmitted.

  When earthquake motion information is not transmitted, the page type is set to “0”, and all the earthquake motion information is set to “1”.

  Next, detailed information on earthquake motion warning when the signal identification is “111” will be described.

  Broadcaster identification 11 bits are uniquely assigned to broadcasters nationwide. Broadcasters can be identified only by AC signals.

  When the start / end flag is “11”, the signal identification “111” is transmitted.

  FIG. 11 shows earthquake motion information when the page type is “0”. When the page type is “0”, the information indicates the target area of the earthquake motion warning, and FIG. 11 shows the bit allocation of the target area. The bit assigned to the area including the target area of the earthquake motion warning is “0”, and the bit allocated to the area not including the target area of the earthquake motion warning is “1”. If earthquake information is not sent, set all to '1'.

  When multiple earthquake motion warnings occur simultaneously (maximum total number 2), the earthquake motion information (regional information) of page type '0' may be sent as the first and second, respectively. The update flag is not updated when the transmission of alarm information (regional information) changes from the first to the second, or from the second to the first.

  FIG. 12 shows the earthquake motion information when the page type is “1”.

  In the “earthquake motion warning identification”, 9 bits are assigned to identify earthquake motion warning information when a plurality of earthquake motion warnings are generated. If it is determined based on the time (in seconds) to distinguish multiple earthquake motion warning information, it is possible to identify the earthquake motion warning information for the past 8 minutes and 32 seconds with 9-bit earthquake motion warning identification. . By comparing the current time of B24 to B54 with the occurrence time of B101 to B110, the number of seconds that have elapsed since the occurrence of the earthquake motion can be known.

  The earthquake motion information identification of B57 is “0” when the transmitted ground motion information is the first information, and “1” when the second information is the second information.

  The occurrence time is based on the same reference year, month, day, hour, minute, and second as the current time indicated by B24 to B54, the elapsed seconds from the reference time are expressed in binary notation, and the lower 10 bits are assigned MSB first.

  The 10 bits of B112 to B121 are CRC-10.

  Since the information related to the detailed information on the seismic motion warning is important information and requires high reliability, error detection by CRC is possible after decoding by an error correction code using the following parity bits.

  The parity bits generated by using the shortened code (187,105) of the difference set cyclic code (273,191) are set in the 82 bits of B122 to B203 similarly to the error correction code of TMCC.

  Since earthquake motion warning information is important information and requires high reliability, it is protected by an error correction code using a differential cyclic code as in TMCC. The configuration identifications B1 to B3 and the synchronization signals B4 to B16 are not subject to error correction. The information of B17 to B121 is subjected to error correction coding with the shortened code (187,105) of the difference set cyclic code (273,191).

  The operation method of the earthquake motion warning information described with reference to FIGS. 3 to 12 will be briefly described with reference to FIG.

  When seismic motion warning information is transmitted by the AC carrier of segment No. 0, the configuration identification is set to the value shown in FIG. When an earthquake occurs and a seismic motion warning is issued, the start / end flag is set to “with seismic motion warning detailed information: '00” ”, and at the same time, an update flag, signal identification, seismic motion warning detailed information, and a parity bit are set. At the end of the earthquake motion warning, the start / end flag is set to “No earthquake motion warning detailed information: '11'”.

  Next, the configuration of the TMCC signal configured by the TMCC signal configuration unit 215 and decoded by the TMCC decoding unit 113 will be described with reference to FIGS.

  FIG. 13 shows a TMCC signal configuration (TMCC carrier bit allocation). The TMCC signal is used to transmit information related to the demodulation operation of the receiver, such as a hierarchical configuration and transmission parameters of each OFDM segment.

  The amplitude and phase reference for differential demodulation is given by Wi in FIG.

  The synchronization signal is composed of a 16-bit word. There are two types of synchronization signals, w0 = 0011010111101110 and w1 = 1100101000010001 obtained by bit-inversion thereof, and w0 and w1 are alternately transmitted for each frame. The synchronization signal is used to establish synchronization of the TMCC signal and OFDM frame synchronization. In order to prevent the pseudo synchronization pull-in phenomenon that occurs when the bit pattern of the TMCC information coincides with the synchronization signal, the polarity of the synchronization signal is inverted for each frame. Since the TMCC information is not inverted every frame, pseudo synchronization pull-in can be avoided by inversion every frame.

  The segment format identification is a signal for identifying whether the segment is a differential modulation unit or a synchronous modulation unit. It is composed of 3-bit words, and is assigned “111” in the case of the differential modulation unit and “000” in the case of the synchronous modulation unit. The number of TMCC carriers varies depending on the segment format. When the partial reception segment belongs to the synchronous modulation unit, there is only one TMCC carrier. Even in this case, 3 bits are assigned to the identification signal so that reliable decoding is possible, and the inverted signal has the maximum intersymbol distance.

  The TMCC information is information that assists the demodulation and decoding operations of the receiver, such as system identification, transmission parameter switching index, emergency warning broadcast activation flag, current information, and next information.

  2 bits are assigned to the system identification signal. “00” is set for a system based on the digital terrestrial television broadcasting system, and “01” is set for a digital terrestrial audio broadcasting system with a common transmission system. The remaining values are reserved.

  Current information indicates the current hierarchical configuration and transmission parameters, and next information indicates the transmission parameters after switching.

  When the transmission parameter is switched, the transmission parameter switching index is counted down to notify the receiver of the switching and take the timing. This index usually takes a value of ‘1111’, but when the transmission parameter is switched, 1 is subtracted for each frame from 15 frames before the switching. It should be noted that after “0000”, it returns to “1111”. The switching timing is the next frame synchronization for sending “0000”. That is, the new transmission parameter is applied from the frame returned to ‘1111’. The next information can be set or changed at an arbitrary time before the switching countdown, but cannot be changed during the countdown.

  FIG. 14 shows bit allocation of TMCC information. Further, FIG. 15 shows transmission parameter information included in the current / next information. If there is no unused layer or next information in the transmission parameter information, those bits are set to ‘1’.

  When switching any one or more of transmission parameters and flags (partial reception flag, carrier modulation scheme, convolutional coding rate, interleave length, number of segments) included in the current information and next information in FIG. Count down the indicator. When only the emergency warning broadcast activation flag is switched, the transmission parameter switching index is not counted down.

  FIG. 16 shows the assignment of the emergency warning broadcast activation flag. In emergency alert broadcasting, the activation flag is set to '1' when activation control for the receiver is performed, and the activation flag is set to '0' when activation control is not performed.

  The partial reception flag is set to '1' when the segment at the center of the transmission band is set for partial reception, and is set to '0' otherwise. When segment No. 0 is set for partial reception, the layer is defined as layer A in FIG. If there is no next information, the flag is set to ‘1’.

  The concatenated transmission phase correction amount is control information used in a digital terrestrial audio broadcasting system with a common transmission system. Of the 102 bits of TMCC information, 90 bits are currently defined, but the remaining 12 bits are reserved for future expansion. In operation, all the reserved bits are stuffed with '1'.

  The TMCC information B20 to B121 is subjected to error correction coding with a shortened code (184,102) of the difference set cyclic code (273,191). TMCC information requires transmission reliability higher than that of a data signal in order to specify transmission parameters and control a receiver. Considering that it is difficult to share the decoding circuit of the concatenated code in the receiver and that the block code is advantageous from the viewpoint of processing delay, the error correction code of TMCC is a shortened code of the difference set cyclic code (273,191) ( 184,102). Further, since the TMCC signal is transmitted by a plurality of carriers, it is possible to reduce the required C / N and improve the reception performance by analog addition of the signals. With these error correction techniques and addition processing, the TMCC signal can be received with a smaller C / N than the data signal. Note that the synchronization signal and the segment format identification information are excluded from the error correction target, and all bits of a plurality of TMCC carriers are made the same to enable majority determination for each bit including parity bits.

  The operation of emergency alert broadcasting (hereinafter referred to as EWS) will be described.

Follow the procedure below to start and end EWS.
(At start)
(1) An emergency information descriptor in which EWS conditions (start_end_flag, type 1 / type 2 and type code) are set is sent out by the PMT.
(2) The broadcaster sends TMCC's emergency warning broadcast activation flag as '1'.
(3) Start broadcasting with content that can be recognized as emergency warning broadcasting.
(When finished)
(1) Send emergency warning broadcast activation flag as '0'.
(2) Delete the emergency information descriptor from the PMT.
(Handling of start flag for TMCC emergency warning broadcasting)
On the sending side, the TMCC emergency warning broadcast activation flag is always set to '1' during the period in which emergency warning broadcasting is performed by any service in the TS (network), regardless of the sending layer. . A receiver that supports automatic activation periodically monitors the activation flag for TMCC emergency warning broadcasting.
(Multiple location of emergency information descriptor)
The emergency information descriptor is described in the descriptor area 1 of the PMT of the service that performs the emergency alert broadcast. In order to clearly indicate that an emergency warning broadcast is being performed to an EWS-compatible receiver, the descriptor is always described in the PMT of the emergency warning broadcast service itself. It is up to each broadcaster to determine whether or not to write an emergency information descriptor in the PMT for other services. However, if a service of a different hierarchy is described, it may be ignored by the receiver.
(Changes to the emergency information descriptor)
If it becomes necessary to change the contents (regional code, etc.) described in the emergency information descriptor during the emergency warning broadcast, the procedure for EWS termination (set the emergency flag for TMCC emergency warning to '0' After deleting the information descriptor), the changed emergency information descriptor is inserted into the PMT, and the TMCC emergency warning activation flag is set to “1” again. Alternatively, after the TMCC emergency warning broadcast activation flag is set to “0” and the description items are changed while the emergency information descriptor is placed on the PMT, the flag can be set to “1”. In any case, the period from when the emergency alert activation flag is set to “0” to “1” is set to 1 second or more and 4 OFDM Frames or more. In addition, since the receiver continues the EWS process for 90 seconds after the emergency warning activation flag becomes '0', the operator must change the target area for 90 seconds without changing the EWS. The emergency alarm activation flag must be set to '1'.
(EWS reception)
For fixed receivers, perform the following operations (1) to (4).
(1) After the TMCC emergency warning broadcast activation flag changes from “0” to “1”, the emergency information descriptor in the descriptor area 1 in the PMT of the reception TS is monitored.
(2) If start_end_flag = 1 of the emergency information descriptor and area_code corresponds to the area code set in the receiver, the service described in the emergency information descriptor is selected and received.
(3) The monitoring of the PMT is continued while the emergency warning broadcast activation flag of TMCC is “1”.
(4) The emergency alert broadcast ends when the TMCC emergency alert broadcast activation flag becomes 0 or when the PMT emergency information descriptor is deleted. However, emergency warning broadcasts may be resumed due to the operation of “Changes in description of emergency information descriptor”. Therefore, EWS reception processing must be continued for at least 90 seconds after the emergency warning broadcast ends. , It returns to the state before starting (the service of EWS reception is not the last memory). Also, when the service is switched during EWS reception, the EWS reception process ends, but when the emergency warning broadcast activation flag of TMCC changes from “0” to “1”, the EWS reception process is started.
-If start_end_flag = 0 in the emergency information descriptor, it is a test broadcast and should not be processed.
-In the case of a receiver that cannot receive TMCC when the power is off (standby), the emergency information description in descriptor area 1 in the PMT of the receiving TS even if the emergency warning broadcast activation flag of TMCC is '1' after power on The child is monitored and the EWS reception process is started.
-In the case of a receiver that can receive TMCC when the power is off (standby), the above EWS reception processing is performed even when the power is off (standby).
-If there is no corresponding PMT during the EWS reception process, the emergency warning broadcast reception process may be terminated.

  For mobile receivers, the area code set in the receiver may differ from the actual location. Therefore, the startup operation should be performed regardless of area_code in the above fixed receiver operation (2). However, this does not apply when the receiving area can be specified by other means. Other operations are basically the same as the above fixed receiver operation, but it is also effective to perform a warning operation to the viewer such as blinking the portable receiver as an alternative means of the EWS reception process.

FIG. 17 shows the above emergency information descriptor change and receiver operation.
(Emergency warning broadcast test signal operation)
In the emergency alert test broadcast, the start_end_flag value of the emergency information descriptor is used as the end signal side '0' from the beginning. During the test broadcast period, the descriptor will continue to be described in the PMT. When the test broadcast ends, the emergency information descriptor is deleted from the PMT when the TMCC emergency warning broadcast activation flag becomes “0”.

  The operation of receiving the earthquake motion warning information described with reference to FIGS. 3 to 12 will be described with reference to FIG.

  1, the AC carrier in the segment No. 0 is extracted and demodulated, and the transmission of the earthquake motion warning information is confirmed by the configuration identification shown in FIG. 5, and further synchronization is established. At this time, since the same earthquake motion warning information is transmitted for all AC carriers in segment No. 0, the analog motion addition of all AC carriers in segment NO. Demodulation becomes possible. For example, if there are N AC carriers, the amplitude of the seismic motion warning information is N times, whereas the noise is uncorrelated in each AC carrier and therefore does not become N times (in terms of power, the seismic motion warning information Is only N times the square of N).

  When the AC decoding unit 116 checks the configuration identification portion shown in FIG. 5 and confirms that the earthquake motion warning information has been sent to the AC, as described in FIG. Is the same as the TMCC sync signal, so that the analog identification of the code identifying the configuration identification and the sync signal and the TMCC sync signal is added to the TMCC for the above reason. Can also reproduce the synchronization signal with low noise.

  Furthermore, as a method for checking the configuration identification part shown in FIG. 5 in the AC decoding unit 116, the 3-bit part from the head of the TMCC synchronization signal and the configuration identification part shown in FIG. 5 of the AC carrier in the segment No. 0 It is possible to determine that the earthquake motion warning information has been sent to the AC when all three bits are correlated.

  When the earthquake motion warning information receiving unit 120 is about to receive the earthquake motion warning information, the channel selection unit 102, the quadrature demodulation unit 103, the FFT unit 104, the synchronous reproduction unit 111, the frame extraction unit 112, and the AC decoding unit 116 are always operating. . The operations of the channel selection unit 102, the quadrature demodulation unit 103, the FFT unit 104, the synchronous reproduction unit 111, and the frame extraction unit 112 perform only the segment NO. Thereby, it can be set as a low power consumption operation | movement rather than processing the 13 segment full band of this digital broadcasting.

  When the earthquake motion warning information receiving unit 120 is about to receive the earthquake motion warning information, the control unit 118 is always operating.

  The AC carrier in the segment No. 0 is extracted and demodulated by the AC decoding unit 116, and the seismic motion warning information start / end flag shown in FIG. 5 is monitored in the sense shown in FIG. In a state where no information is reported, the state of switching from “no earthquake motion warning information” to “with earthquake motion warning information” is monitored.

  The discriminating unit 117 is in a stopped state at the initial stage, that is, when the earthquake motion warning information is not issued (the earthquake motion warning information start / end flag is “No earthquake motion warning information”).

  Further, at the stage when the earthquake motion warning information is not issued, the demodulation / decoding unit 105, the descrambling unit 106, the demax unit 107, the decoding unit 108, the switching units 114 and 115, the video output unit 109, and the audio output unit 110 are stopped. It is in a state.

The TMCC decoding unit 113 is always operating when trying to receive an emergency alert broadcast, and monitors the emergency alert broadcast activation flag shown in FIG.
At this time, the channel selection unit 102, the quadrature demodulation unit 103, the FFT unit 104, the synchronous reproduction unit 111, and the frame extraction unit 112 are always operating. The operations of the channel selection unit 102, the quadrature demodulation unit 103, the FFT unit 104, the synchronous reproduction unit 111, and the frame extraction unit 112 need only be performed for the segment No. 0, that is, only the one-segment part when receiving an emergency warning broadcast. . Thereby, it can be set as a low power consumption operation | movement rather than processing the 13 segment full band of this digital broadcasting.

  The operation in the case of “with start-up control” is as described with reference to FIGS.

  When an earthquake occurs and seismic motion warning information is issued, that is, when the seismic motion warning information start / end flag is “with seismic motion warning detailed information”, the AC decoding unit 116 starts from “no seismic motion warning detailed information”. The state of switching to “there is detailed earthquake motion warning information” is detected, and “there is detailed earthquake motion warning information”, that is, the information that the earthquake motion warning information is issued is transmitted to the control unit 118. The control unit 118 sends a control signal that causes the determination unit 117 to be in a normal state and the broadcast reception unit 119 to be in a standby state. The AC decoding unit 116 extracts and confirms the seismic motion warning information start / end flag, the seismic motion warning information update flag, the identification flag shown in FIG. 5 when the seismic motion warning information start / end flag becomes “earthquake motion warning detailed information available”. The signal, seismic motion warning information details, CRC-10, and parity bit data are output to the determination unit 117.

  The determination unit 117 that has entered the normal state receives the data from the AC decoding unit 116, performs error correction of the shortened code of the difference set cyclic code, performs CRC-10 error detection, and then performs signal identification shown in FIG. The meaning is confirmed and the meaning shown in FIG. 9 is determined. Then, predetermined processing is performed according to each meaning, and the discrimination information is sent to the control unit 118.

  Based on the discrimination information from the discrimination unit 117, the control unit 118 changes the broadcast reception unit 119 that has been in the standby state from the standby state to the normal state when the identification signal is “detailed information on earthquake motion warning (with applicable area)”. In addition, the switching units 114 and 115 are controlled so as to select a signal from the determination unit 117. The video signal and the audio signal indicating the detailed information on the seismic motion warning from the determination unit 117 are output to the video output unit 109 and the audio output unit 110, respectively, and the seismic motion warning is performed.

  In the above example, the broadcast receiving unit 119 is controlled to be in the standby state. However, only the switching units 114 and 115, the video output unit 109, and the audio output unit 110 may be controlled to be in the standby state.

  Furthermore, although the above shows an example in which the broadcast receiving unit 119 is controlled from the standby state to the normal state, only the switching units 114 and 115, the video output unit 109, and the audio output unit 110 are normally changed from the broadcast receiving unit 119 in the standby state. Alternatively, the standby state switching units 114 and 115, the video output unit 109, and the audio output unit 110 may be controlled to be in a normal state. As a result, there is an effect that an earthquake motion alarm can be performed with lower power consumption than when the broadcast receiving unit 119 is controlled.

  Here, the normal state represents a normally operating state, the standby state does not operate, but can immediately shift to the normal state, and the stopped state does not operate. The standby state of the broadcast receiving unit 119, the switching units 114 and 115, the video output unit 109, and the audio output unit 110 refers to energization so that video output or audio output can be performed quickly when the normal state is reached.

  The detailed operation of the determination unit 117 will be described.

  The discriminating unit 117 confirms the signal identification shown in FIG. 5 and discriminates the meaning shown in FIG. 9. When the identification signal is “Earthquake motion warning detailed information (with corresponding area)”, a buzzer sound or voice A warning by flashing light or a display is displayed. At the same time, the discriminating unit 117 outputs the earthquake detailed information and time information such as the prefecture information and the epicenter information where strong shaking is expected as shown in FIG. 10, FIG. 11 and FIG. Or count down to the time when the earthquake is expected to occur. At the same time, the control unit 118 controls the broadcast receiving unit 119 that has been in the standby state from the standby state to the normal state, and controls the switching units 114 and 115 to select the signal from the determination unit 117. The video signal and the audio signal indicating the detailed information on the seismic motion warning from the determination unit 117 are output to the video output unit 109 and the audio output unit 110, respectively, and the seismic motion warning is performed.

  When the discriminating unit 117 discriminates “earthquake motion warning detailed information (no relevant area)”, the video output unit 109 and the audio output unit 110 are not output. However, depending on the case, the same operation as “there is a corresponding area” is performed, and the video output unit 109 displays earthquake detailed information such as prefecture information and epicenter information expected to be strongly shaken, or the audio output unit 110. You may make it output by voice.

  When the discriminating unit 117 discriminates the “test signal for detailed earthquake motion warning information (with relevant area)” or “the test signal for detailed earthquake motion warning information (without relevant region)”, this is generally performed by the seismic motion warning information receiving unit 120. This is effective when the operation is confirmed in the test mode, ignored in the normal operation mode, and is not output to the video output unit 109 or the audio output unit 110. In the test mode, for example, video information or audio indicating that the mode is the test mode for each operation of “seismic motion warning detailed information (with corresponding area)” or “earthquake motion warning detailed information (without corresponding area)”. Multiplex information.

  The discriminating unit 117 always needs to check the signal identification when the earthquake motion warning information start / end flag is “detailed information on earthquake motion warning”, but at least when the state of the earthquake motion warning information update flag changes, the signal identification is always performed. Confirm.

  Next, the AC decoding unit 116 is monitoring the state where the earthquake motion warning information start / end flag is switched from “with detailed earthquake motion warning information” to “without detailed earthquake motion warning information”, and the earthquake motion warning information start / end flag is “ In the case of “No detailed earthquake motion warning information”, information “No detailed earthquake motion warning information” is transmitted to the control unit 118. The control unit 118 sends a signal that causes the determination unit 117 to stop. The determination unit 117 receives this and enters a stop state. At the same time, the control unit 118 sends a control signal to the broadcast receiving unit 119. The broadcast receiving unit 119 receives this signal, keeps the broadcast receiving unit 119 in a normal state for a certain period of time, and switches the switching units 114 and 115 to the decoding unit 108 side. At this time, the decoded broadcast video signal from the digital broadcast decoding unit 108 received by the channel selection unit 102 is output to the video output unit 109, and the decoded broadcast audio signal is output to the audio output unit 110 for a predetermined time. After the elapse, the broadcast receiving unit 119 is brought into a stopped state. On the other hand, the control unit 118 controls the AC decoding unit 116 to stop data output from the AC decoding unit 116 to the determination unit 117.

  Here, the stop state of the broadcast receiving unit 119 means that the channel selection unit 102, the orthogonal demodulation unit 103, the FFT unit 104, the synchronous reproduction unit 111, and the frame extraction unit 112 are in one-segment operation, and the demodulation / decoding unit 105, the descrambling unit 106, the demax unit 107, the decoding unit 108, the switching units 114 and 115, the video output unit 109, and the audio output unit 110 are not operating.

  The standby state of the broadcast receiving unit 119 means that the channel selection unit 102, the quadrature demodulation unit 103, the FFT unit 104, the synchronous reproduction unit 111, and the frame extraction unit 112 operate in the 13-segment full band, and the demodulation / decoding unit 105, the descrambling unit 106, the demax unit 107, and the decoding unit 108 are operating, and the switching units 114 and 115, the video output unit 109, and the audio output unit 110 are not operating.

  The normal state of the broadcast receiving unit 119 is that the channel selection unit 102, the quadrature demodulation unit 103, the FFT unit 104, the synchronous reproduction unit 111, and the frame extraction unit 112 operate in the 13-segment full band, and the demodulation / decoding unit 105, the descrambling unit 106, the demax unit 107, and the decoding unit 108 are operating, and the switching units 114 and 115, the video output unit 109, and the audio output unit 110 are operating.

  Note that the TMCC decoding unit 113 is always operating.

  The above description is based on the assumption that the digital broadcast receiving apparatus 121 is not operating. However, the digital broadcast receiving apparatus 121 is operating, that is, the broadcast receiving unit 119 was originally in a normal state. Sometimes, the following operations are performed.

  When the earthquake motion warning information start / end flag becomes “earthquake motion warning detailed information exists”, the AC decoding unit 116 detects a state of switching from “earthquake motion warning detailed information” to “earthquake motion warning detailed information present”, By the control signal, “there is detailed earthquake motion warning information”, that is, information on which the earthquake motion warning information is issued is transmitted to the control unit 118. The control unit 118 sends a control signal that causes the determination unit 117 to be in a normal state. In addition, the control unit 118 sends a control signal to the broadcast receiving unit 119, and the broadcast receiving unit 119 receives the control signal. The switching unit 114, 115 receives the determination signal from the decoded broadcast video signal from the decoding unit 108. Preparation for switching from the decoded broadcast audio signal from the decoding unit 108 to the audio signal from the determination unit 117 is performed. On the other hand, the AC decoding unit 116 detects and confirms the earthquake motion warning information start / end flag and the earthquake motion warning information update flag shown in FIG. , Identification signal, earthquake motion warning information details, CRC-10, and parity bit data are output to the discriminating unit 117.

  The discriminating unit 117, which is in the normal state by the control signal, receives the data from the AC decoding unit 116, performs error correction of the shortened code of the difference set cyclic code, performs CRC-10 error detection, and then shows FIG. The signal identification is confirmed, and the meaning shown in FIG. 9 is determined. Then, predetermined processing is performed according to each meaning, and the discrimination information is sent to the control unit 118.

  Based on the discrimination information from the discrimination unit 117, the control unit 118 controls the switching units 114 and 115 to select the signal from the discrimination unit 117 when the identification signal is “seismic motion warning detailed information (with applicable area)”. To do. The video signal and the audio signal indicating the detailed information on the seismic motion warning from the determination unit 117 are output to the video output unit 109 and the audio output unit 110, respectively, and the seismic motion warning is performed.

  Next, the AC decoding unit 116 monitors the state of switching from the earthquake motion warning information start / end flag “with detailed earthquake motion warning information” to “no detailed earthquake motion warning information”, and the earthquake motion warning information start / end flag is set to “earth motion. In the case of “no alarm detailed information”, the control unit 118 is informed of “no earthquake motion alarm detailed information”. The control unit 118 sends a signal that causes the determination unit 117 to stop. The determination unit 117 receives this and enters a stop state. At the same time, the control unit 118 sends a control signal to the broadcast receiving unit 119, and the broadcast receiving unit 119 receives this signal, and the switching unit 114 and 115 respectively decode the video signal from the determination unit 117 from the decoding unit 108. Switching to the broadcast video signal is performed from the audio signal from the determination unit 117 to the decoded broadcast audio signal from the decoding unit 108. On the other hand, the control unit 118 controls the AC decoding unit 116 to stop data output from the AC decoding unit 116 to the determination unit 117.

  According to the present embodiment, when the earthquake motion warning information is broadcasted, the switching units 114 and 115 are used to switch from the broadcast video signal or broadcast audio signal of the normal television broadcast to the video signal or audio signal of the earthquake motion warning information. There is an effect that it is possible to provide a digital broadcast receiving apparatus that displays image and outputs sound with the highest priority on earthquake motion warning information. In addition, since it is only necessary to have one video output unit and one audio output unit, there is an effect that the cost can be reduced with a simple configuration. Furthermore, there is an effect that the broadcast receiving unit 119 can be automatically activated when the digital broadcast receiving apparatus 121 is not in operation, and when the digital broadcast receiving apparatus 121 is in operation, it is quickly switched to earthquake motion warning information. There is an effect that can be done.

  Here, the TMCC signal and the AC signal transmitted by the digital broadcast transmission apparatus in FIG. 2 will be described with reference to FIGS.

  Also, the TMCC signal and AC signal transmitted by the digital broadcast transmission apparatus of FIG. 2 and the emergency alarm broadcast and earthquake motion alarm reception operation (control method of the control unit 118) of the digital broadcast reception apparatus of FIG. To do. The control unit 118 receives the emergency warning broadcast activation flag information from the TMCC decoding unit 113 and the seismic motion warning information from the seismic motion warning information receiving unit 120, and controls the switching units 114 and 115 when the seismic motion warning should be issued. Then, the video signal for the earthquake motion warning is output to the video output unit 109, and the audio signal for the earthquake motion warning is output to the audio output unit 110.

  FIG. 18 shows the transmission operation timing of the start / end flag of earthquake motion warning information sent by the AC signal and the emergency warning broadcast start flag sent by the TMCC signal. As shown in FIG. 18, first, when the start / end flag is “Earthquake alarm detailed information available: '00” ”, even if it is necessary to carry out emergency alarm broadcasting during the period of“ 00 ”, During the period of '00', the start flag is not set to “with start control: ON”, and the start / end flag is set to “no earthquake motion warning detailed information: '11” ”and the start flag is set to“ with start control: Set to "ON". In this way, the receiving operation of both the seismic motion warning and the emergency warning broadcast overlaps the digital broadcasting receiving device that supports both the seismic motion warning and the emergency warning broadcasting, and the receiving operation of the seismic motion warning and the emergency warning broadcast each other. It is possible to prevent a reception failure from occurring and an output of earthquake motion warning information from being hindered.

The receiver operation at this time will be described.
(1) The start / end flag is “No detailed earthquake alarm information: '11” ”
The startup flag is "No startup control: OFF"
The receiver is in normal operation
(2) Start / end flag is “Earthquake alarm detailed information available: '00” ”
The startup flag is "No startup control: OFF"
In case of, the receiver supports the earthquake motion warning operation
(3) The start / end flag is “No detailed earthquake alarm information: '11” ”
The startup flag is "No startup control: OFF"
The receiver is in normal operation
(4) The start / end flag is “No detailed earthquake alarm information: '11” ”
The startup flag is "Startup control available: ON"
In case of, the receiver supports emergency alert broadcasting
(5) The start / end flag is "No detailed earthquake alarm information: '11'"
The startup flag is "No startup control: OFF"
In the case of, the receiver returns to normal operation. In the receiver operation of FIG. 18, when the start / end flag is “earthquake motion warning detailed information: '00” ”, the emergency warning broadcast activation flag is“ with activation control: Since “ON” does not transmit due to overlapping, there is an effect that the receiver can respond to the seismic motion warning operation and the emergency warning broadcast without being hindered.

  FIG. 19 shows the start / end flag of the earthquake motion warning information sent by the AC signal, the signal identification, and the transmission operation timing of the emergency warning broadcast start flag sent by the TMCC signal. As shown in FIG. 19, first, if the start / end flag is “Earthquake motion warning detailed information: '00” ”and the signal identification is“ Earthquake motion warning detailed information (with applicable area): “000” ”. Even if it is necessary to carry out emergency warning broadcasting during the period of '00' and '000', the start flag is not set to "with start control: ON" during the period of '00' and '000'. / After the end flag is “No seismic motion warning detailed information: '11” ”, or the signal identification is“ Earthquake motion warning detailed information (no applicable area): '001 ””, the start flag is activated. Controlled: Set to ON. In this way, the receiving operation of both the seismic motion warning and the emergency warning broadcast overlaps the digital broadcasting receiving device that supports both the seismic motion warning and the emergency warning broadcasting, and the receiving operation of the seismic motion warning and the emergency warning broadcast each other. It is possible to prevent a reception failure from occurring and an output of earthquake motion warning information from being hindered. Even when the signal identification is “Earthquake motion warning detailed information test broadcast (with applicable region): '010” ”, the operation is performed when the signal identification is“ Earthquake motion warning detailed information (with applicable region):' 000 ””. Follow the case. In this case, however, “Earthquake motion warning detailed information (no relevant area):“ 011 ”” is used instead of “Seismic motion warning detailed information (no relevant area):“ 001 ””.

The receiver operation at this time will be described.
(1) The start / end flag is “No detailed earthquake alarm information: '11” ”
The signal identification is "No detailed earthquake alarm information: '111'"
The startup flag is "No startup control: OFF"
The receiver is in normal operation
(2) Start / end flag is “Earthquake alarm detailed information available: '00” ”
Signal identification is “Seismic motion warning detailed information (with applicable area): '000” ”
The startup flag is "No startup control: OFF"
In case of, the receiver supports the earthquake motion warning operation
(3) The start / end flag is “No detailed earthquake alarm information: '11” ”
The signal identification is "No detailed earthquake alarm information: '111'"
The startup flag is "No startup control: OFF"
The receiver is in normal operation
(4) The start / end flag is “No detailed earthquake alarm information: '11” ”
The signal identification is "No detailed earthquake alarm information: '111'"
The startup flag is "Startup control available: ON"
In case of, the receiver supports emergency alert broadcasting
(5) The start / end flag is "No detailed earthquake alarm information: '11'"
The signal identification is "No detailed earthquake alarm information: '111'"
The startup flag is "No startup control: OFF"
In the case of, the receiver returns to normal operation. In the receiver operation of FIG. 19, when the start / end flag is “Earthquake alarm detailed information: '00” ”, the emergency alarm broadcast activation flag is“ with activation control: Since “ON” does not transmit due to overlapping, there is an effect that the receiver can respond to the seismic motion warning operation and the emergency warning broadcast without being hindered.

  Or, when the start / end flag is “Earthquake alarm detailed information: '00” ”and the signal identification is“ Earthquake alarm detailed information (with applicable area): “000” ”, the emergency alarm broadcast activation flag is“ Activated ”. Controlled: ON "is not transmitted because it overlaps, so there is an effect that the receiver can respond to the seismic motion warning operation and the emergency warning broadcast without being hindered.

  FIG. 20 shows the start / end flag of the earthquake motion warning information sent by the AC signal, the signal identification, and the transmission operation timing of the emergency warning broadcast start flag sent by the TMCC signal. As shown in FIG. 20, first, if the start / end flag is “earthquake motion warning detailed information:“ 00 ”” and the signal identification is “earthquake motion warning detailed information (no corresponding area):“ 001 ”, then“ If it becomes necessary to carry out emergency warning broadcasting during the period of 00 ', 001', it will not prevent the activation flag from being "with startup control: ON" during the period of '00', '001'. . By doing in this way, there exists an effect which can broadcast emergency alert broadcast immediately. Even when the signal identification is “Earthquake motion warning detailed information test broadcast (no applicable area): '011” ”, the operation is performed with the signal identification“ Earthquake alarm detailed information (no applicable area):' 001 ””. Follow the case.

First, when the start flag is "No start control: OFF", the seismic motion warning is issued and the start / end flag is "Earth motion warning detailed information: '00""and the signal identification is" Earthquake motion warning detailed information (no applicable area) " : In case of "001", if it is necessary to start the emergency alert broadcasting during that period, the receiver operation when the operation flag for that period is "Startup control: ON" is permitted. Will be explained.
(1) The start / end flag is “No detailed earthquake alarm information: '11” ”
The signal identification is "No detailed earthquake alarm information: '111'"
The startup flag is "No startup control: OFF"
The receiver is in normal operation
(2) Start / end flag is “Earthquake alarm detailed information available: '00” ”
Signal identification is “Seismic motion warning detailed information (no applicable area): '001” ”
The startup flag is "No startup control: OFF"
In case of, the receiver supports the earthquake motion warning operation
(3) Start / end flag is “Earthquake alarm detailed information available: '00” ”
Signal identification is “Seismic motion warning detailed information (no applicable area): '001” ”
The startup flag is "Startup control available: ON"
In case of, the receiver supports emergency alert broadcasting
(4) The start / end flag is “Earthquake alarm detailed information available: '00” ”
Signal identification is “Seismic motion warning detailed information (no applicable area): '001” ”
The startup flag is "No startup control: OFF"
In case of, the receiver supports the earthquake motion warning operation
(5) The start / end flag is "No detailed earthquake alarm information: '11'"
The signal identification is "No detailed earthquake alarm information: '111'"
The startup flag is "No startup control: OFF"
In the case of, the receiver returns to the normal operation. In the receiver operation of FIG. 20, the start / end flag is “earthquake motion warning detailed information: '00” ”and the signal identification is“ earthquake motion warning detailed information (no applicable area): “ In the case of 001 '", since it is not a corresponding area of the earthquake motion warning, there is an effect that the emergency warning broadcast can be performed with priority over the earthquake motion warning operation.

  Even when the signal identification is “Earthquake motion warning detailed information test broadcast (with applicable region): '010” ”, the operation is performed when the signal identification is“ Earthquake motion warning detailed information (with applicable region):' 000 ””. Follow the case. In addition, even when the signal identification is “Test broadcast of detailed earthquake motion warning information (no applicable area): '011” ”, the operation is also performed when the signal identification is“ Earthquake alarm detailed information (no applicable area): “001” ”. Follow the case. Since the receiver is a test broadcast, it will not respond in normal operation, but during maintenance such as in the receiver test mode, it will indicate that it is a test broadcast and the signal identification will be "Earthquake motion warning detailed information (with applicable areas): '000" In case of “”, follow the receiver operation when the signal identification is “Earthquake alarm detailed information (no applicable area):“ 001 ””.

  Next, regarding the TMCC signal and the AC signal transmitted by the digital broadcast transmission apparatus of FIG. 2 and the emergency alarm broadcast and earthquake motion alarm reception operation (control method of the control unit 118) of the digital broadcast reception apparatus of FIG. This will be described with reference to FIGS. 21, 22, 23, and 24. FIG.

  The control unit 118 receives the emergency warning broadcast activation flag information from the TMCC decoding unit 113 and the seismic motion warning information from the seismic motion warning information receiving unit 120, and controls the switching units 114 and 115 when the seismic motion warning should be issued. Then, the video signal for the earthquake motion warning is output to the video output unit 109, and the audio signal for the earthquake motion warning is output to the audio output unit 110. The operation will be described below.

FIG. 21 shows the start / end flag and signal identification of the earthquake motion warning information sent by the AC signal, the transmission operation timing of the emergency warning broadcast start flag sent by the TMCC signal, and the receiving operation thereof. As shown in FIG. 21, first, if the start / end flag is “Earthquake alarm detailed information:“ 11 ”” and the emergency warning broadcast starts and the activation flag is “with activation control: ON”, If it is necessary to issue a seismic motion warning during a period with start control, even if the start flag is "Start control: ON", the start / end flag is set to "With detailed seismic alarm information: '00'" Start operation of earthquake alarm. The receiver operation at this time will be described.
(1) The start / end flag is “No detailed earthquake alarm information: '11” ”
The signal identification is "No detailed earthquake alarm information: '111'"
The startup flag is "No startup control: OFF"
The receiver is in normal operation
(2) The start / end flag is "No detailed earthquake alarm information: '11'"
The signal identification is "No detailed earthquake alarm information: '111'"
The startup flag is "Startup control available: ON"
In case of, the receiver supports emergency alert broadcasting
(3) Start / end flag is “Earthquake alarm detailed information available: '00” ”
Signal identification is “Seismic motion warning detailed information (with applicable area): '000” ”
The startup flag is "Startup control available: ON"
In the case of, the receiver gives priority to the seismic motion warning operation.
(4) The start / end flag is “No detailed earthquake alarm information: '11” ”
The signal identification is "No detailed earthquake alarm information: '111'"
The startup flag is "Startup control available: ON"
In the case of, the receiver ends the earthquake motion warning operation and supports emergency warning broadcasting
(5) The start / end flag is "No detailed earthquake alarm information: '11'"
The signal identification is "No detailed earthquake alarm information: '111'"
The startup flag is "No startup control: OFF"
In the case of, the receiver returns to the normal operation. In the receiver operation of FIG. 21, when the start / end flag is “detailed information on earthquake motion warning: '00” ”, the earthquake motion warning operation has priority over the emergency warning broadcast. Because it is implemented, the emergency warning broadcast has the effect of not preventing the earthquake motion warning.

  Or, if the start / end flag is “Earthquake alarm detailed information: '00” ”and the signal identification is“ Earthquake alarm detailed information (with applicable area): “000” ”, the earthquake alarm is activated from the emergency alarm broadcast. Because it is prioritized, emergency alert broadcasting has the effect of not preventing information output in the area of the earthquake motion warning from being affected.

FIG. 22 shows the start / end flag and signal identification of the seismic motion warning information sent by the AC signal, the transmission operation timing of the emergency warning broadcast activation flag sent by the TMCC signal, and the receiving operation thereof. As shown in FIG. 22, first, if the emergency warning broadcast starts and the activation flag is “with activation control: ON” during the period when the start / end flag is “No detailed earthquake motion warning information: '11” ”, If it is necessary to issue a seismic motion warning during a period with start control, even if the start flag is "Start control: ON", the start / end flag is set to "With detailed seismic alarm information: '00'" Start operation of earthquake alarm. At this time, the receiver operation when the signal identification is “detailed information on earthquake motion warning (no corresponding area): '001” ”will be described.
(1) The start / end flag is “No detailed earthquake alarm information: '11” ”
The signal identification is "No detailed earthquake alarm information: '111'"
The startup flag is "No startup control: OFF"
The receiver is in normal operation
(2) The start / end flag is "No detailed earthquake alarm information: '11'"
The signal identification is "No detailed earthquake alarm information: '111'"
The startup flag is "Startup control available: ON"
In case of, the receiver supports emergency alert broadcasting
(3) Start / end flag is “Earthquake alarm detailed information available: '00” ”
Signal identification is “Seismic motion warning detailed information (no applicable area): '001” ”
The startup flag is "Startup control available: ON"
The receiver will continue to broadcast the emergency alert
(4) The start / end flag is “No detailed earthquake alarm information: '11” ”
The signal identification is "No detailed earthquake alarm information: '111'"
The startup flag is "Startup control available: ON"
The receiver will continue to broadcast the emergency alert
(5) The start / end flag is "No detailed earthquake alarm information: '11'"
The signal identification is "No detailed earthquake alarm information: '111'"
The startup flag is "No startup control: OFF"
In the case of, the receiver returns to normal operation. In the receiver operation of FIG. In the case of 001 '", since it is not a corresponding area of the earthquake motion warning, there is an effect that the emergency warning broadcast can be performed with priority over the earthquake motion warning operation.

FIG. 23 shows the start / end flag and signal identification of the earthquake motion warning information sent by the AC signal, the transmission operation timing of the emergency warning broadcast activation flag sent by the TMCC signal, and the reception operation thereof. As shown in FIG. 23, first, if the start flag is “No start control: OFF”, the seismic motion warning is issued and the start / end flag is “Earthquake motion warning detailed information: '00” ”. The operation of the receiver when the emergency warning broadcast needs to be started during the period with the detailed earthquake motion warning information and the transmission operation with the activation flag “with activation control: ON” during that period is permitted will be described.
(1) The start / end flag is “No detailed earthquake alarm information: '11” ”
The signal identification is "No detailed earthquake alarm information: '111'"
The startup flag is "No startup control: OFF"
The receiver is in normal operation
(2) Start / end flag is “Earthquake alarm detailed information available: '00” ”
Signal identification is “Seismic motion warning detailed information (with applicable area): '000” ”
The startup flag is "No startup control: OFF"
In case of, the receiver supports the earthquake motion warning operation
(3) Start / end flag is “Earthquake alarm detailed information available: '00” ”
Signal identification is “Seismic motion warning detailed information (with applicable area): '000” ”
The startup flag is "Startup control available: ON"
In case of, the receiver continues the seismic motion warning operation
(4) The start / end flag is “No detailed earthquake alarm information: '11” ”
The signal identification is "No detailed earthquake alarm information: '111'"
The startup flag is "Startup control available: ON"
In case of, the receiver supports emergency alert broadcasting
(5) The start / end flag is "No detailed earthquake alarm information: '11'"
The signal identification is "No detailed earthquake alarm information: '111'"
The startup flag is "No startup control: OFF"
In the case of, the receiver returns to the normal operation. In the receiver operation of FIG. 23, when the start / end flag is “detailed information on earthquake motion warning: '00” ”, the earthquake motion warning operation has priority over the emergency warning broadcast. Because it is implemented, the emergency warning broadcast has the effect of not preventing the earthquake motion warning.

  Or, if the start / end flag is “Earthquake alarm detailed information: '00” ”and the signal identification is“ Earthquake alarm detailed information (with applicable area): “000” ”, the earthquake alarm is activated from the emergency alarm broadcast. Because it is prioritized, emergency alert broadcasting has the effect of not preventing information output in the area of the earthquake motion warning from being affected.

FIG. 24 shows the start / end flag and signal identification of the earthquake motion warning information sent by the AC signal, the transmission operation timing of the emergency warning broadcast start flag sent by the TMCC signal, and the reception operation thereof. As shown in FIG. 24, first, an earthquake motion warning is issued in the period when the activation flag is “no activation control: OFF”, and the start / end flag is “detailed information on earthquake motion alarm: '00” ”and the signal identification is“ earthquake motion alarm ”. Detailed information (no applicable area): When “001” is set, if it is necessary to start emergency alert broadcasting during that period, the operation flag for that period is “with start control: ON”. The operation of the receiver when permitted is described.
(1) The start / end flag is “No detailed earthquake alarm information: '11” ”
The signal identification is "No detailed earthquake alarm information: '111'"
The startup flag is "No startup control: OFF"
The receiver is in normal operation
(2) Start / end flag is “Earthquake alarm detailed information available: '00” ”
Signal identification is “Seismic motion warning detailed information (no applicable area): '001” ”
The startup flag is "No startup control: OFF"
In case of, the receiver supports the earthquake motion warning operation
(3) Start / end flag is “Earthquake alarm detailed information available: '00” ”
Signal identification is “Seismic motion warning detailed information (no applicable area): '001” ”
The startup flag is "Startup control available: ON"
In case of, the receiver supports emergency alert broadcasting
(4) The start / end flag is “No detailed earthquake alarm information: '11” ”
The signal identification is "No detailed earthquake alarm information: '111'"
The startup flag is "Startup control available: ON"
The receiver will continue to broadcast the emergency alert
(5) The start / end flag is "No detailed earthquake alarm information: '11'"
The signal identification is "No detailed earthquake alarm information: '111'"
The startup flag is "No startup control: OFF"
In this case, the receiver returns to the normal operation. In the receiver operation of FIG. In the case of 001 '", since it is not a corresponding area of the earthquake motion warning, there is an effect that the emergency warning broadcast can be performed with priority over the earthquake motion warning operation.

  Even when the signal identification is “Earthquake motion warning detailed information test broadcast (with applicable region): '010” ”, the operation is performed when the signal identification is“ Earthquake motion warning detailed information (with applicable region):' 000 ””. Follow the case. In addition, even when the signal identification is “Test broadcast of detailed earthquake motion warning information (no applicable area): '011” ”, the operation is also performed when the signal identification is“ Earthquake alarm detailed information (no applicable area): “001” ”. Follow the case. Since the receiver is a test broadcast, it will not respond in normal operation, but during maintenance such as in the receiver test mode, it will indicate that it is a test broadcast and the signal identification will be "Earthquake motion warning detailed information (with applicable areas): '000" In case of “”, follow the receiver operation when the signal identification is “Earthquake alarm detailed information (no applicable area):“ 001 ””.

  Hereinafter, an embodiment of the determination unit 117, which is the main block of the present invention, will be described with reference to FIG.

  2501 is an input of data from the AC decoding unit 116, 2502 is an error correction detection unit, 2503 is an input of a control signal from the control unit 118, 2504 is a clock unit, 2505 is a current time setting unit, 2506 is a data judgment storage unit, 2507 Is a comparison determination unit, 2508 is a buzzer sound generation unit, 2509 is a processing unit, 2510 is a video signal output, 2511 is an audio signal output, and 2512 is an output of determination information to the control unit 118.

  The clock unit 2504 always operates even when the determination unit 117 is in a stopped state, and indicates an accurate time. Use of GPS (Global Positioning System), the use of a radio clock function that automatically corrects errors by receiving standard radio waves, and the use of a function that automatically updates the correct time from the outside, such as the Internet, can be considered as methods for obtaining accurate time. Although not limited to these, it is not preferable to obtain time information from digital broadcasting for the reason described later.

  The current time setting unit 2505, the data determination storage unit 2506, the comparison determination unit 2507, the buzzer sound generation unit 2508, and the processing unit 2509 operate when the determination unit 117 is in the “standby state” and “normal state” and is in the “stop state”. It does not work when.

  When the determination unit 117 receives a control signal from the control unit 118 via the input 2503 and enters a standby state or a normal state, the current time setting unit 2505 always extracts and sets the current time from the clock unit 2504. When the AC decoding unit 116 determines that the earthquake motion warning information start / end flag “there is detailed earthquake motion warning information”, the AC decoding unit 116 sends the information “there is detailed earthquake motion warning information” to the control unit 118. The control unit 118 sends a control signal for making the determination unit 117 from the stopped state to the normal state via the input 2503. Thereafter, the seismic motion warning information start / end flag and the seismic motion warning information update flag shown in FIG. 5 are sent from the AC decoding unit 116 to the error correction detection unit 2502 of the determination unit 117 via the input 2501 by a control signal from the control unit 118. , Identification signal, earthquake motion warning information details, CRC-10, and parity bit data are output. The error correction detection unit 2502 performs error correction of the shortened code of the differential cyclic code, and then performs CRC-10 error detection. When there is no error, the data from the AC decoding unit 116 is confirmed by the data determination storage unit 2506 for the signal identification shown in FIG. 5 to determine the meaning shown in FIG. In the case of “There is a corresponding area”, the information shown in FIGS. 10, 11, and 12 is stored. The time information is stored and simultaneously compared with the current time of the current time setting unit 2505 by the comparison determination unit 2507. The sent time information in the data judgment storage unit 2506 is the current time information of the broadcasting station when the broadcasting station transmits, and has a predetermined accuracy. In addition to this, the processing delay of the broadcasting station, the propagation delay of the broadcast radio wave reaching the receiver, the processing delay of the digital broadcast receiver 121 that receives this, and the time taking into account the accuracy of the clock unit 2504, all of these are added at the maximum Since the time information in the data determination storage unit 2506 and the current time of the current time setting unit 2505 do not deviate beyond the positive / negative (advance / delay) of the time, the comparison determination unit 2507 uses this as a threshold value, and the comparison determination unit 2507 If it is within the hold value, it is determined as “normal”, and if it exceeds the threshold value, it is determined as “abnormal”. The comparison determination unit 2507 controls the buzzer sound generation unit 2508 to generate a buzzer sound when it is determined that “the area is present” and “normal”. As a result, it is possible to accumulate broadcast waves when earthquake motion warning information has been issued in the past (hereinafter referred to as RF capture). Has time information at the time of RF capture, the current time of the current time setting unit 2505 exceeds the threshold value, and the comparison determination unit 2507 determines that it is “abnormal” and does not generate a buzzer sound. There is an effect that it is possible to prevent a malfunction in which a buzzer sound is generated by the buzzer sound generator 2508. Instead of the buzzer sound generating unit 2508, a warning may be generated by voice or a warning display by flashing light. The judgment information of the comparison judgment unit 2507 is sent to the processing unit 2509 and also sent to the control unit 118 via the output 2512.

  The processing unit 2509 stores time information, detailed earthquake information such as prefecture information and epicenter information in the data determination storage unit 2506, and at the same time, prepares output from the video signal output 2510 and prepares output from the audio signal output 2511. I do. For example, although not shown in FIG. 25, the time until the arrival of the earthquake is calculated from the installation location of the digital broadcast receiving apparatus stored in advance and the detailed earthquake information.

  Output signals are output from the video signal output 2510 and the audio signal output 2511 only in the “normal state”.

  When the judgment information from the comparison judgment unit 2507 is “normal”, the video signal output 2510 and the audio signal output 2511 receive the signal from the processing unit 2509 and output the video signal output and the audio signal output of the earthquake motion warning information, respectively. To do. 11 and 12 are detailed earthquake information and time information such as prefectural information and epicenter information where strong shaking is expected, or countdown information until a time when an earthquake is expected to occur.

  The AC decoding unit 116 monitors the state of switching from the earthquake motion warning information start / end flag “with detailed earthquake motion warning information” to “without detailed earthquake motion warning information”, and the earthquake motion warning information start / end flag is set to “detailed information about earthquake motion warning”. When “None” is set, the control unit 118 is informed of “no seismic motion warning detailed information”, and the control unit 118 sends a signal for stopping the discriminating unit 117. The discriminating unit 117 receives the signal via the input 2503. Receiving this, it will be in a stop state. That is, except for the clock unit 2504, all blocks stop operating.

  According to the embodiment of FIG. 25, it is possible to prevent malfunction of warning generation by comparing the time information with the current time.

  Further, since the buzzer sound is generated, there is an effect that the occurrence of the earthquake can be quickly notified by the buzzer sound.

  A second embodiment according to the present invention will be described with reference to FIGS. 26 and 27. FIG.

  FIG. 26 is a block diagram showing a configuration of a digital broadcast receiving apparatus that receives earthquake motion warning information transmitted using an AC signal included in segment number # 0 transmitted by the digital broadcast transmitting apparatus of FIG.

  Reference numerals 2601 and 2602 denote synthesizing units, and FIG. 27 shows details thereof.

  The difference between FIG. 1 and FIG. 26 is that the switching units 114 and 115 are replaced by combining units 2601 and 2602, respectively.

  Hereinafter, the synthesis units 2601 and 2602 will be described with reference to FIG. FIG. 27 also shows the decoding unit 108 in detail.

  2701 is an input of a compressed program video signal, a compressed program audio signal, and a digital signal of a data signal from the descrambling unit 106, and 2703 is a moving picture and a still image for the compressed program video signal and the video data signal. A video decoding unit that performs decoding processing on each of the image, character graphic, and subtitle, 2704 is an audio decoding unit that performs decoding processing on the compressed program audio signal and audio data signal, and 2705 displays a moving image. A moving picture plane display memory, 2706 is a still picture plane display memory for displaying a still picture, 2707 is a moving picture still picture switching plane display memory showing information for switching a moving picture and a still picture for each pixel, and 2708 is a character Character graphic plane display memory for displaying graphics 2709 is a subtitle plane display memory for displaying subtitles. 2710 is a switching unit that switches between a moving image from the moving image plane display memory 2705 and a still image from the still image plane display memory 2706 for each pixel based on information in the moving image still image switching plane display memory 2707, and 2711 is a switching unit 2710. An adjustment unit that adjusts the synthesis ratio of the output signal, 2712 is an adjustment unit that adjusts the synthesis ratio of the output signal of the character / graphic plane display memory 2708, 2713 is an addition unit that synthesizes the output signals of the adjustment units 2711 and 2712, and 2714 is an addition An adjustment unit that adjusts the output signal combining ratio of the unit 2713, 2715 is an adjustment unit that adjusts the output signal combining ratio of the subtitle plane display memory 2709, and 2716 is an addition unit that combines the output signals of the adjustment units 2714 and 2715. Thus, the decoding unit 108 is configured. The adder 2716 outputs a broadcast video signal, and the audio system decoder 2704 outputs a broadcast audio signal.

  Reference numeral 2717 denotes data input from the AC decoding unit 116.

  Reference numeral 2718 denotes an adjustment unit that adjusts the composite ratio of the broadcast video signal that is the output signal of the adder 2716, 2719 denotes an adjustment unit that adjusts the composite ratio of the video signal of the earthquake motion warning information that is the output signal of the determination unit 117, and 2720 denotes an adjustment. An adder that synthesizes the output signals of the units 2718 and 2719, and 2721 is an output of a synthesized video signal that is an output signal of the adder 2720.

  Reference numeral 2722 denotes an adjustment unit that adjusts the synthesis ratio of the broadcast audio signal that is an output signal of the audio system decoding unit 2704; 2723, an adjustment unit that adjusts the synthesis ratio of the audio signal of the earthquake motion warning information that is the output signal of the determination unit 117; Is an adding unit that synthesizes the output signals of the adjusting units 2722 and 2723, and 2725 is an output of a synthesized speech signal that is an output signal of the adding unit 2724, and constitutes the synthesizing unit 2602.

  A method of synthesizing the broadcast video signal of the decoding unit 108 will be described.

  The scrambled TS signal for copyright protection is descrambled by the descrambling unit 106 and input from the input 2701 to the demax unit 107. The demux unit 107 extracts a desired compressed program video signal, compressed program audio signal, and data signal, and outputs them to the decoding unit 108. At this time, the desired compressed program video signal and video data signal are input to the video decoder 2703, and the desired compressed program audio signal and audio data signal are input to the audio decoder 2704. .

  Here, the desired compressed program video signal and video data signal and the desired compressed program audio signal and audio data signal are converted into character graphics, still images, and moving images by a data stream or a data carousel. Transmission is performed as monophonic audio media. These data are decoded and separated into individual encoded monomedia data.

  The encoded monomedia data is decoded by each decoder. Audio is decoded by audio system decoding, video signal is decoded by video, character / figure / still image is decoded by character / figure / still image decoding, subtitle / character super is decoded by subtitle / character super decoding.

  In the decoded video signal, the character graphic, still image, and moving image are displayed by the character graphic plane display memory 2708, the still image plane display memory 2706, and the moving image plane display memory 2705, respectively, and the moving image still image switching plane display memory 2707 is displayed. The synthesis is performed under the control. Note that scaling may be performed when displaying on each plane.

  In the multimedia service, presentation control of these mono-media is controlled by a framework defined by multimedia coding. Further, the caption super is displayed on the caption plane display memory 2709 by the encoding method of caption and character super, and the presentation control is performed.

  The switching unit 2710 switches the moving image from the moving image plane display memory 2705 and the still image from the still image plane display memory 2706 for each pixel based on information in the moving image still image switching plane display memory 2707. The output signal of the switching unit 2710 is adjusted by the adjusting unit 2711 so that the synthesis ratio is “1−α1” times. On the other hand, the character graphic that is an output signal from the character graphic plane display memory 2708 is adjusted by the adjustment unit 2712 to the composition ratio “α1” times. Here, α1 represents opacity and takes a value from 0 to 1. The adder 2713 combines the output signals of the adjusters 2711 and 2712. When α1 is 0, only the output signal of the switching unit 2710 is obtained, and when α1 is 1, only the character graphic that is an output signal from the character graphic plane display memory 2708 is obtained.

  The output signal of the adding unit 2713 is adjusted by the adjusting unit 2714 to be “1−α2” times as a composite ratio. On the other hand, the subtitle which is the output signal from the subtitle plane display memory 2709 is adjusted by the adjusting unit 2715 to the composition ratio “α2” times. Here, α2 represents opacity and takes a value from 0 to 1. An adder 2716 combines the output signals of the adjusters 2714 and 2715. When α2 is 0, only the output signal of the adder 2713 is provided, and when α2 is 1, only the caption that is an output signal from the caption plane display memory 2709 is provided.

  As described above, subtitles, character graphics, still images, and moving images are combined, and a broadcast video signal is output from the adder 2716.

  In the synthesizing unit 2601, the broadcast video signal from the adding unit 2716 is adjusted by the adjusting unit 2718 to the synthesis ratio “1-α3” times, while the video signal of the earthquake motion warning information that is the output signal from the determining unit 117 is adjusted. In 2719, the combination ratio is adjusted to "α3" times, the output signals of the adjustment units 2718 and 2719 are combined in the addition unit 2720, and the output signal of the addition unit 2720 is output to the output 2721 as a composite video signal. Here, α3 represents opacity and takes a value from 0 to 1. When α3 is 0, the combined video signal output from the output 2721 is only the broadcast video signal from the adder 2716, and α3 is 1. In this case, the combined video signal output from the output 2721 is only the video signal of the earthquake motion warning information that is the output signal from the determination unit 117.

  In the synthesis unit 2602, the broadcast audio signal from the audio system decoding unit 2704 is adjusted to a synthesis ratio “1−α4” times by the adjustment unit 2722, and on the other hand, the audio signal of the earthquake motion warning information that is the output signal from the determination unit 117 The adjustment unit 2723 adjusts the combination ratio to “α4” times, the output signals of the adjustment units 2722 and 2723 are combined by the addition unit 2724, and the output signal of the addition unit 2724 is output to the output 2725 as a synthesized speech signal. Here, α4 represents a synthesis rate, and takes a value from 0 to 1. When α4 is 0, the synthesized audio signal output from the output 2725 is only the broadcast audio signal from the audio decoding unit 2704, and α4 is In the case of 1, the synthesized voice signal output from the output 2725 is only the voice signal of the earthquake motion warning information that is the output signal from the determination unit 117.

  In this embodiment, by setting α3 and α4 to a value larger than 0.5, there is an effect that the video signal and the audio signal of the earthquake motion warning information can be presented more conspicuously than the broadcast video signal and the broadcast audio signal, respectively. .

  The discriminating unit 117 uses the character font information and other display information of the decoding unit 108 when creating a video signal of earthquake motion warning information, or the decoding unit 108 when creating an audio signal of earthquake motion warning information. By using the buzzer sound type information possessed by the digital broadcast receiver 121, it is possible to have a circuit configuration that does not require the digital broadcast receiving apparatus 121 to have duplicate information. In this case, the low-cost determination unit 117 is used. There is an effect that can be.

  In the embodiment of FIG. 26, the control unit 118 in FIGS. 18, 19, 20, 21, 22, 23, and 24 also includes emergency warning broadcast activation flag information from the TMCC decoding unit 113, When the seismic motion warning information is input from the seismic motion warning information receiving unit 120 and the seismic motion warning is to be issued, the synthesis units 2601 and 2602 are controlled, and the seismic motion warning video signal is sent to the video output unit 109 and the seismic motion warning audio signal. Can be output to the audio output unit 110.

  Embodiment 3 according to the present invention will be described with reference to FIG.

  In FIG. 28, the synthesis unit 2601 of FIG. 27 is omitted, and the video signal of the earthquake motion warning information is directly written into the caption plane display memory 2709 of the decoding unit 108. The subtitle plane display memory 2709 updates the video signal of the seismic motion warning information from the determination unit 117 after updating the decoded subtitle from the video system decoding unit 2703. Alternatively, the subtitle plane display memory 2709 does not write the decoded subtitle from the video system decoding unit 2703 at the place where the video signal of the earthquake motion warning information from the determination unit 117 is written. Also, α2 is set to a value larger than 0.5.

  Furthermore, when a caption is displayed in the caption plane display memory 2709, the video signal of the earthquake motion warning information can be displayed avoiding the display portion. In addition to subtitles, it is also possible to display a video signal of earthquake motion warning information by avoiding a display portion where a broadcaster emphasizes or requires video display in data broadcasting or the like. Furthermore, when the receiver displays an image that seems to be important, the image signal of the earthquake motion warning information can be displayed by avoiding the display portion.

  As described above, there is an effect that the video signal of the earthquake motion warning information can be synthesized and presented more conspicuously than the broadcast video signal without increasing the video system synthesis unit.

  The discriminating unit 117 uses the character font information and other display information of the decoding unit 108 when creating a video signal of earthquake motion warning information, or the decoding unit 108 when creating an audio signal of earthquake motion warning information. By using the buzzer sound type information possessed by the digital broadcast receiver 121, it is possible to have a circuit configuration that does not require the digital broadcast receiving apparatus 121 to have duplicate information. In this case, the low-cost determination unit 117 is used. There is an effect that can be.

  Embodiment 4 according to the present invention will be described with reference to FIGS. 29 and 30. FIG.

  FIG. 29 is a block diagram showing a configuration of a digital broadcast receiving apparatus that receives earthquake motion warning information transmitted using an AC signal included in segment number # 0 transmitted by the digital broadcast transmitting apparatus of FIG.

  Reference numeral 2901 denotes an output unit for earthquake motion warning information, and FIG.

  The difference between FIG. 1 and FIG. 29 is that the output 2901 of the earthquake motion warning information is separated from the video output unit 109 and the audio output unit 110 which are the output parts of the broadcast receiving unit 119.

  In FIG. 30, the video signal output from the video signal output 2510 of the earthquake motion warning information from the processing unit 2509 described in FIG. 25 and the audio signal output from the audio signal output 2511 are respectively output to the video output unit 3001. The audio output unit 3002 is used for output. Note that the video output unit 3001 may be a video display such as a flash device that blinks light or a video display using a simple video display device such as a 7-segment display.

  29, the earthquake has occurred and the earthquake motion warning information start / end flag becomes “earthquake motion warning detailed information” and the identification signal is “earthquake motion warning detailed information (there is a corresponding area). ”, The video output unit 109 of the broadcast receiving unit 119 outputs the video signal and the audio signal indicating the detailed information on the earthquake motion warning from the discriminating unit 117 using the video output unit 3001 and the audio output unit 3002, respectively. Control is performed so that the output from the audio output unit 110 does not interfere with the video signal and audio signal indicating the earthquake motion warning detailed information output from the video output unit 3001 and the audio output unit 3002. Specifically, the video of the video output unit 109 is darkened, made into a still image, a message indicating that seismic motion warning detailed information has been issued, and the audio of the audio output unit 110 is muted (not output) ), Reduce the volume, etc.

  In this embodiment, there is an effect that the video signal and the audio signal of the earthquake motion warning information can be made more conspicuous than the broadcast video signal and the broadcast audio signal, respectively. In addition, since it has a video output unit and audio output unit independent of the broadcast receiving unit, even if the video output unit and audio output unit of the broadcast receiving unit are not outputting, it can be quickly started up and earthquake motion warning information can be displayed. There is an effect that can be output.

  Also in the embodiment of FIG. 29, the control unit 118 in FIGS. 18, 19, 20, 21, 21, 22, 23, and 24 also includes the emergency warning broadcast activation flag information from the TMCC decoding unit 113 and the like. When the seismic motion warning information is input from the seismic motion warning information receiving unit 120 and the seismic motion warning is to be issued, the output unit 2901 outputs the seismic motion warning and controls the broadcast receiving unit 119 so as not to prevent the output of the seismic motion warning. To do.

  1, 26, and 29 may be either a 13-segment receiver or a one-segment receiver.

  Embodiment 5 according to the present invention is a method for transmitting earthquake motion warning information transmitted using an AC signal included in segment number # 0 transmitted by the digital broadcast transmission device of FIG. It relates to the receiver operation of the receiver. In the following, description will be made with reference to FIG. 33 showing the seismic motion warning information sending operation and the receiver operation.

  In the fifth embodiment, earthquake motion information is alternately transmitted in the order of “region information” and “seismic source information”. Here, the “region information” indicates earthquake motion information transmitted with “page type” “0” of the earthquake motion warning information and information indicating the target region of the earthquake motion warning. The “seismic source information” indicates seismic motion information transmitted by “page type” “1” of the seismic motion warning information, and information on the seismic motion warning source.

  As for the digital broadcast receiving apparatus that receives the earthquake motion warning information, it is assumed that the device that always performs the earthquake motion warning information acquisition processing and the device that performs the earthquake motion warning information acquisition processing only when the power is turned on. In general-purpose products, the latter implementation is considered common. In the case of such an implementation, there is a high possibility that the seismic motion warning being issued is processed from the middle. For this reason, depending on the method of transmitting earthquake motion warning information, there is a possibility that only one of “regional information” or “seismic source information” can be acquired, or it may take time to acquire both. is there. The seismic motion warning is for notifying the arrival of a strong shaking after a few seconds and preparing for it, so it is desirable to notify the viewer as soon as possible.

  Therefore, in this embodiment, “region information” and “seismic source information” are alternately sent once per OFDM frame in this order. As a result, the digital broadcast receiving apparatus can acquire both “region information” and “seismic source information” within 3 OFDM frames, regardless of the timing at which the acquisition process is started. In addition, by sending “region information” first, it is possible to first inform the receiver whether or not the installation location of the receiver is the target area of the earthquake motion warning.

  Hereinafter, a method for transmitting earthquake motion warning information will be described.

    Reference numeral 3300 in FIG. 33 denotes an emergency earthquake warning transmitted from the earthquake motion warning distribution server of the Japan Meteorological Agency (not shown), and indicates reception of the first report that is the first report after the occurrence of the earthquake.

    3301: An emergency earthquake bulletin from the Japan Meteorological Agency has not been received. When there is no earthquake motion warning information to be sent, all bits are sent as “1”. Immediately after receiving the first earthquake early warning 3300, the "start / end flag" is changed from "11" to "00", and the transmission of earthquake motion warning information is started. Since promptness is important, it is desirable to start transmitting earthquake motion warning information in the next OFDM frame after receiving the earthquake early warning.

    3302: An OFDM frame for sending first earthquake motion warning information after receiving an earthquake early warning from the Japan Meteorological Agency. The “start / end flag” is changed from “11” to “00” indicating “start”. The “update flag” is set to “00” which is a start value. “Signal identification” is “000” indicating “detailed information on earthquake motion warning (with corresponding area)” if the target area of the earthquake motion warning is within the broadcast area, and “detailed information on earthquake motion warning (without corresponding area)” when there is not. Set “001”. In this embodiment, “000” is set. Earthquake motion information is alternately transmitted once in the order of “page type”, “0: regional information”, and “1: epicenter information”. In the first earthquake motion warning information transmission OFDM frame, “page type” “0” is set, and “region information” is transmitted.

    3303: This is an OFDM frame for sending second earthquake motion warning information. The “start / end flag”, “update flag”, and “signal identification” continue to be set in 3302. The earthquake motion information is set to “page type” “1”, and “seismic source information” is transmitted.

    Thereafter, while the “start / end flag” is “00”, the earthquake motion warning information (3302) including “region information” and the earthquake motion warning information (3303) including “seismic source information” are alternately and once per OFDM frame. Continue sending one by one.

    By transmitting the earthquake motion warning information by the method as described above, the digital broadcast receiving apparatus can promptly provide both “regional information” and “seismic source information” regardless of the timing of acquiring the earthquake motion warning information.

    Next, FIG. 1, FIG. 25, and FIG. 33 are used for the receiver operation when “region information” and “seismic source information” are alternately transmitted once in OFDM frame units in this order in the earthquake motion warning information. I will explain. About FIG. 1, FIG. 25, the description about the content described in Example 1 is omitted.

    33 and 3310 show the reception processing operation of the digital broadcast receiving apparatus that always performs the seismic motion warning information acquisition processing. In the present embodiment, the earthquake motion warning information transmitted from the digital broadcast transmission device is alternately transmitted once for each OFDM frame in the order of “page type”, “0: area information”, and “1: seismic source information”. A transmission pattern is assumed.

  As described in the first embodiment, the AC decoding unit 116 (FIG. 1) monitors the start / end flag of the earthquake motion warning information, and from the start / end flag “11: No detailed earthquake motion information” to “00: Detailed earthquake motion information”. The change to “Yes” is detected, and the control unit 118 (FIG. 1) is notified of the seismic motion warning information, and the control unit 118 uses this as a trigger to send a control signal to put the determination unit 117 (FIG. 1) in the normal state. Send and start processing for earthquake alarm. The discriminating unit 117 (FIG. 25) that has entered the normal state performs the receiving process of the seismic motion information transmitted in the above-described transmission pattern when detecting a change in the value of the update flag. That is, 2 OFDM frame information is acquired from the time of detection, and seismic motion information reception processing is performed. In FIG. 33, an OFDM frame 330 and an OFDM frame 3303 are shown. The received earthquake motion warning information is confirmed by the data discrimination storage unit 2506 (FIG. 25) for the signal identification value shown in FIG. When the value of the signal identification is “000: Detailed earthquake motion warning information (there is a corresponding area)” shown in FIG. 9, the earthquake motion warning detailed information shown in FIG. 5, FIG. 10, FIG. To remember. In this embodiment, as the ground motion information, “region information” having a page type value “0” and “seismic source information” having a page type value “1” are alternately transmitted. Therefore, in the information of the data discrimination storage unit 2506, the storage of “region information” is updated when the OFDM frame (3302) at the time of detection is received, and the storage of “seismic source information” is updated when the next OFDM frame (3303) is received. Information on both “regional information” and “seismic source information” can be acquired in two OFDM frames. Since the update flag always changes from “11” to “00” at the timing of detecting the earthquake motion warning information, the determination unit 117 always acquires and updates the earthquake motion warning information. Since the processing unit 2509 generates warning information to be transmitted to the viewer as a video signal or an audio signal every time the storage in the data discrimination storage unit 2506 is updated, the latest information can always be provided to the viewer. .

    As described above, the digital broadcast receiving apparatus obtains the earthquake motion warning information of the transmission pattern in which “region information” and “seismic source information” are alternately sent one by one in this order, so that the configuration of the receiver can be simplified. can do. In addition, since “regional information” and “seismic source information” are sent alternately, it is possible to acquire both information in 2 OFDM frames from the detection of the earthquake motion warning information, and promptly notify the viewer of the information on the earthquake motion warning. be able to.

    Furthermore, since the update is detected and the earthquake motion warning information is acquired, the updated latest information can be immediately transmitted to the viewer. In addition, since the seismic motion warning information acquisition process is performed only when an update is detected, the seismic motion warning information reception processing is not performed when new seismic motion warning information is not received, and the processing load on the receiver can be reduced.

  In addition, since the “region information” is received first, the receiver can immediately notify the viewer whether or not the installation location of the receiver is the target region of the earthquake motion warning information.

    33 and 3320 show the reception processing operation of the digital broadcast receiver that performs the seismic motion warning information acquisition processing only when the power is turned on.

    When the AC decoder 116 is turned on (3330), it starts monitoring the start / end flag of the earthquake motion warning information. When the power is turned on, the earthquake motion warning information may have already been issued. First, the value of the start / end flag is confirmed. If “00: Detailed earthquake motion information exists”, the control unit 118 is notified of the earthquake motion warning. Communicate that information is being reported. In response to this, the control unit 118 sends a control signal for bringing the determination unit 117 into a normal state, and starts a process corresponding to the earthquake motion warning.

    The discriminating unit 117 (FIG. 25) that has entered the normal state assumes that the seismic motion information is transmitted in the transmission pattern described above, even if it does not detect a change in the value of the update flag, information on 2 OFDM frames after power-on. To acquire seismic motion information. 33 correspond to 2OFDM frames that are received after the power is turned on and that perform seismic motion information acquisition processing. As for the received earthquake motion warning information, the signal identification value shown in FIG. 5 is confirmed in the data discrimination storage unit 2506 (FIG. 25) in the same manner as in FIGS. When the value of the signal identification is “000: Detailed earthquake motion warning information (there is a corresponding area)” shown in FIG. 9, the earthquake motion warning detailed information shown in FIG. 5, FIG. 10, FIG. To remember. In this embodiment, as the ground motion information, “region information” having a page type value “0” and “seismic source information” having a page type value “1” are alternately transmitted. Depending on the timing of turning on the power, the order of receiving “Regional information” and “Earthquake information” may be reversed, but within three OFDM frames from the start of receiving the first earthquake motion warning detailed information when the power is turned on, Both “seismic source information” and ground motion information can be acquired. Further, even if the order of receiving “region information” and “seismic source information” is reversed, it can be discriminated by the value of the page type, so that no problem occurs in the reception processing.

    Thereafter, after the first information is acquired, as in the processing of FIGS. 33 and 3310, when a change in the value of the update flag is detected, the information of 2 OFDM frames is acquired from the detection time, and the received earthquake motion warning information is acquired. Process.

  As described above, the same effects as those of the digital broadcast receiving apparatus of FIGS. 33 and 3310 can be obtained, and even when the earthquake motion warning information has already been issued when the power is turned on, the earthquake motion warning information can be quickly acquired and quickly In addition, a warning can be transmitted to the viewer.

  A sixth embodiment according to the present invention will be described with reference to FIG.

  The sixth embodiment is an example in which seismic motion information is repeatedly and alternately transmitted in units of OFDM frames in the order of “page type”, “1: seismic source information”, and “0: regional information”.

    3401: An emergency earthquake bulletin from the Japan Meteorological Agency has not been received. As with 3301 of the fifth embodiment, all bits are transmitted with “1”, and immediately after receiving the first earthquake early warning 3300, the “start / end flag” is changed from “11” to “00”, and an earthquake motion warning is issued. Start sending information.

    3402: This is an OFDM frame for transmitting the first earthquake motion warning information. As in 3302 of the fifth embodiment, the “start / end flag” is changed from “11” to “00” indicating “start”. The “update flag” is set to “00” which is a start value. “Signal identification” is “000” indicating “detailed information on earthquake motion warning (with corresponding area)” if the target area of the earthquake motion warning is within the broadcast area, and “detailed information on earthquake motion warning (without corresponding area)” when there is not. Set “001”. In this embodiment, “000” is set. The seismic motion information is alternately sent once in the order of “page type”, “1: seismic source information”, and “0: regional information”. Therefore, the first seismic motion warning information transmission OFDM frame is set to “page type” “1”. And send “seismic source information”.

    3403: This is an OFDM frame for sending the second earthquake motion warning information. The “start / end flag”, “update flag”, and “signal identification” continue to be set to 3402. The earthquake motion information is set to “page type” “0”, and “region information” is transmitted.

    Thereafter, while the “start / end flag” is “00”, the seismic motion warning information (3402) including “seismic source information” and the seismic motion warning information (3403) including “regional information” are alternately and once per OFDM frame. Continue sending one by one.

    By transmitting the earthquake motion warning information by the method as described above, as in the case of the fifth embodiment, the digital broadcast receiving apparatus can promptly “regional information” and “seismic source information” regardless of the timing of the earthquake motion warning information acquisition. Both information can be provided.

  The “seismic source information” includes information on “total number of seismic motion information” for identifying the number of seismic motion information and “earthquake motion information identification” for identifying seismic motion information when a plurality of seismic motion information is transmitted. In the transmission pattern in which “seismic source information” earthquake motion warning information is transmitted first as in the present embodiment, the receiver can first identify the number of earthquake motion information and which seismic motion information. Therefore, it is possible to provide a transmission pattern that makes it easy to associate “seismic source information” and “region information” when there are a plurality of pieces of earthquake motion information.

    By transmitting the earthquake motion warning information by the method as described above, the digital broadcast receiving apparatus can promptly provide both “regional information” and “seismic source information” regardless of the timing of acquiring the earthquake motion warning information.

    Next, with reference to FIG. 1, FIG. 25, and FIG. 34, the receiver operation when “seismic source information” and “region information” are alternately transmitted once in OFDM frame units in this order in the earthquake motion warning information. I will explain. About FIG. 1, FIG. 25, the description about the content described in Example 1 is omitted.

    34 and 3410 show the reception processing operation of the digital broadcast receiving apparatus that always performs the acquisition processing of earthquake motion warning information. In the present embodiment, the earthquake motion warning information transmitted from the digital broadcast transmission device is alternately transmitted once for each OFDM frame in the order of “page type”, “1: seismic source information”, and “0: regional information”. A transmission pattern is assumed.

  As described in the first embodiment, the AC decoding unit 116 (FIG. 1) monitors the start / end flag of the earthquake motion warning information, and from the start / end flag “11: No detailed earthquake motion information” to “00: Detailed earthquake motion information”. The change to “Yes” is detected, and the control unit 118 (FIG. 1) is notified of the seismic motion warning information, and the control unit 118 uses this as a trigger to send a control signal to put the determination unit 117 (FIG. 1) in the normal state. Send and start processing for earthquake alarm. The discriminating unit 117 (FIG. 25) that has entered the normal state performs the receiving process of the seismic motion information transmitted in the above-described transmission pattern when detecting a change in the value of the update flag. That is, 2 OFDM frame information is acquired from the time of detection, and seismic motion information reception processing is performed. In FIG. 34, an OFDM frame 3402 and an OFDM frame 3403 are shown. The received earthquake motion warning information is confirmed by the data discrimination storage unit 2506 (FIG. 25) for the signal identification value shown in FIG. When the value of the signal identification is “000: Detailed earthquake motion warning information (there is a corresponding area)” shown in FIG. 9, the earthquake motion warning detailed information shown in FIG. 5, FIG. 10, FIG. To remember. In this embodiment, the seismic motion information is alternately transmitted as “seismic source information” having a page type value “1” and “region information” having a page type value “0”. Therefore, in the information of the data discrimination storage unit 2506, the storage of the “seismic source information” is updated when the OFDM frame (3402) at the time of detection is received, and the storage of “region information” is updated when the next OFDM frame (3403) is received. Information on both “regional information” and “seismic source information” can be acquired in two OFDM frames. Since the update flag always changes from “11” to “00” at the timing of detecting the earthquake motion warning information, the determination unit 117 always acquires and updates the earthquake motion warning information. Since the processing unit 2509 generates warning information to be transmitted to the viewer as a video signal or an audio signal every time the storage in the data discrimination storage unit 2506 is updated, the latest information can always be provided to the viewer. .

    As described above, the digital broadcast receiving apparatus acquires the earthquake motion warning information of the transmission pattern in which “seismic source information” and “region information” are alternately sent one by one in this order. Can be. In addition, because “seismic source information” and “regional information” are sent alternately, “2 information can be acquired in 2 OFDM frames from the detection of seismic motion warning information, and the seismic motion warning information is quickly notified to the viewer. can do.

    Furthermore, since the update is detected and the earthquake motion warning information is acquired, the updated latest information can be immediately transmitted to the viewer. In addition, since the seismic motion warning information acquisition process is performed only when an update is detected, the seismic motion warning information reception processing is not performed when new seismic motion warning information is not received, and the processing load on the receiver can be reduced.

  In the transmission pattern as in the present embodiment, the receiver can first receive “seismic source information” earthquake motion warning information. Therefore, the number of seismic motion information and which seismic motion information can be identified first, and there is an effect that it becomes easy to associate “seismic source information” and “region information” when there are a plurality of seismic motion information.

    33 and 3420 show the reception processing operation of the digital broadcast receiving apparatus that performs the seismic motion warning information acquisition processing only when the power is turned on.

    When the AC decoder 116 is turned on (3430), it starts monitoring the start / end flag of the earthquake motion warning information. When the power is turned on, the earthquake motion warning information may have already been issued. First, the value of the start / end flag is confirmed. If “00: Detailed earthquake motion information exists”, the control unit 118 is notified of the earthquake motion warning. Communicate that information is being reported. In response to this, the control unit 118 sends a control signal for bringing the determination unit 117 into a normal state, and starts a process corresponding to the earthquake motion warning.

  Based on the assumption that the seismic motion information is transmitted in the transmission pattern described above, the discriminating unit 117 (FIG. 25) that has entered the normal state can detect the information of 2 OFDM frames after the power is turned on even if it does not detect a change in the value of the update flag. Acquire and perform seismic motion information acquisition processing. 34, 3404 and 3405 in FIG. 34 correspond to 2OFDM frames that are received after the power is turned on and that perform the acquisition process of the earthquake motion information. As for the received earthquake motion warning information, the signal identification value shown in FIG. 5 is confirmed in the data discrimination storage unit 2506 (FIG. 25) in the same manner as in FIGS. When the value of the signal identification is “000: Detailed earthquake motion warning information (there is a corresponding area)” shown in FIG. 9, the earthquake motion warning detailed information shown in FIG. 5, FIG. 10, FIG. To remember. In the present embodiment, the earthquake motion information is alternately transmitted as “seismic source information” having a page type value “1” and “region information” having a page type value “0”. Depending on the timing of turning on the power, the order of receiving the “seismic source information” and “regional information” may be reversed, but the “seismic source information”, "Regional information", both earthquake motion information can be acquired. Also, even if the order of receiving “seismic source information” and “regional information” is reversed, it can be discriminated by the value of the page type, so no problem occurs in the reception process.

    Thereafter, after the first information is acquired, as in the processing of FIGS. 34 and 3410, when a change in the value of the update flag is detected, the information of 2 OFDM frames is acquired from the detection time and the received earthquake motion warning information is acquired. Process.

  As described above, the same effects as those of the digital broadcast receiving apparatus of FIGS. 34 and 3410 can be obtained, and even when the earthquake motion warning information has already been issued when the power is turned on, the earthquake motion warning information can be quickly acquired and quickly In addition, a warning can be transmitted to the viewer.

  A seventh embodiment according to the present invention will be described with reference to FIG.

  The seventh embodiment is an example in which seismic motion information is repeatedly transmitted twice in units of OFDM frames in the order of “page type”, “0: area information”, and “1: seismic source information”. That is, in this example, “0: area information”, “0: area information”, “1: seismic information”, and “1: seismic information” are transmitted in one set.

    3501: An emergency earthquake bulletin from the Japan Meteorological Agency has not been received. As with 3301 of the fifth embodiment, all bits are transmitted with “1”, and immediately after receiving the first earthquake early warning 3300, the “start / end flag” is changed from “11” to “00”, and an earthquake motion warning is issued. Start sending information.

    3502: An OFDM frame for transmitting first earthquake motion warning information. As in 3302 of the fifth embodiment, the “start / end flag” is changed from “11” to “00” indicating “start”. The “update flag” is set to “00” which is a start value. “Signal identification” is “000” indicating “detailed information on earthquake motion warning (with corresponding area)” if the target area of the earthquake motion warning is within the broadcast area, and “detailed information on earthquake motion warning (without corresponding area)” when there is not. Set “001”. In this embodiment, “000” is set. The seismic motion information is alternately transmitted twice in the order of “page type”, “0: regional information”, and “1: seismic source information”, so the first seismic motion warning information transmission OFDM frame is set to “page type” “0”. "Regional information" is sent out.

    3503: This is an OFDM frame for transmitting the second earthquake motion warning information. The earthquake motion warning information sent at 3502 is sent again.

    3304: This is an OFDM frame for sending third earthquake motion warning information. The “start / end flag”, “update flag”, and “signal identification” continue to be set to 3502. The earthquake motion information is set to “page type” “1”, and “seismic source information” is transmitted.

    3505: This is an OFDM frame for sending fourth earthquake motion warning information. The earthquake motion warning information sent in 3504 is sent again.

    Thereafter, while the “start / end flag” is “00”, the earthquake motion warning information including “region information” and the earthquake motion warning information including “seismic source information” are alternately and twice in units of OFDM frames, that is, 3502, 3503. , 3504, and 3505 are repeatedly sent.

    As described above, the digital broadcast transmission apparatus according to the present embodiment can provide the same effects as the digital broadcast transmission apparatus according to the fifth embodiment. In addition, by sending the same information twice, it is possible to provide earthquake motion warning information so that it can be easily obtained even when the reception status is not so good in a portable digital broadcast receiver.

  Next, FIG. 1, FIG. 25, and FIG. 35 are used for the receiver operation when “regional information” and “seismic source information” are alternately transmitted twice in OFDM frame units in this order as earthquake motion warning information. I will explain. About FIG. 1, FIG. 25, the description about the content described in Example 1 is omitted.

    35 and 3510 show the reception processing operation of the digital broadcast receiving apparatus that always performs the acquisition process of the earthquake motion warning information. In this embodiment, the seismic motion warning information transmitted from the digital broadcast transmitting device is in the order of “page type”, “0: regional information”, “0: regional information”, “1: epicenter information”, “1: seismic source information”. Thus, this is assumed to be a transmission pattern transmitted in units of OFDM frames.

  As described in the first embodiment, the AC decoding unit 116 (FIG. 1) monitors the start / end flag of the earthquake motion warning information, and from the start / end flag “11: No detailed earthquake motion information” to “00: Detailed earthquake motion information”. The change to “Yes” is detected, and the control unit 118 (FIG. 1) is notified of the seismic motion warning information, and the control unit 118 uses this as a trigger to send a control signal to put the determination unit 117 (FIG. 1) in the normal state. Send and start processing for earthquake alarm. The discriminating unit 117 (FIG. 25) that has entered the normal state performs the receiving process of the seismic motion information transmitted in the above-described transmission pattern when detecting a change in the value of the update flag. That is, the information of the first OFDM frame (3502) and the third OFDM frame (3504) in which a change in the value of the update flag is detected is acquired, and the seismic motion information reception process is performed. The received earthquake motion warning information is confirmed by the data discrimination storage unit 2506 (FIG. 25) for the signal identification value shown in FIG. When the value of the signal identification is “000: Detailed earthquake motion warning information (there is a corresponding area)” shown in FIG. 9, the earthquake motion warning detailed information shown in FIG. 5, FIG. 10, FIG. To remember. In this embodiment, as the ground motion information, “region information” having a page type value “0” and “seismic source information” having a page type value “1” are alternately transmitted. Therefore, in the information of the data discrimination storage unit 2506, the storage of “region information” is updated when the OFDM frame (3502) at the time of detection is received, and the storage of “seismic source information” is received when the OFDM frame (3503) is received after the 2 OFDM frames. It is updated, and both “Regional information” and “Episode information” can be acquired within 3 OFDM frames. Even if reception of the OFDM frame 3502 and reception of the OFDM frame 3504 fail to acquire earthquake motion warning information, the “region information” and “seismic source information” are re-acquired in the OFDM frame 3503 and the OFDM frame 3505. It is possible to acquire both pieces of information in the fourth OFDM frame.

    Since the update flag always changes from “11” to “00” at the timing of detecting the earthquake motion warning information, the determination unit 117 always acquires and updates the earthquake motion warning information. Since the processing unit 2509 generates warning information to be transmitted to the viewer as a video signal or an audio signal every time the storage in the data discrimination storage unit 2506 is updated, the latest information can always be provided to the viewer. .

    As described above, this embodiment can provide the same effects as those of the fifth embodiment.

    Furthermore, since “regional information” and “seismic source information” are alternately transmitted twice, it can be expected that the earthquake motion warning information can be easily obtained even when the reception state is not so good.

    35 and 3520 show the reception processing operation of the digital broadcast receiving apparatus that performs the acquisition process of the earthquake motion warning information only when the power is turned on.

    When the AC decoder 116 is turned on (3530), it starts monitoring the start / end flag of the earthquake motion warning information. When the power is turned on, the earthquake motion warning information may have already been issued. First, the value of the start / end flag is confirmed. If “00: Detailed earthquake motion information exists”, the control unit 118 is notified of the earthquake motion warning. Communicate that information is being reported. In response to this, the control unit 118 sends a control signal for bringing the determination unit 117 into a normal state, and starts a process corresponding to the earthquake motion warning.

  The discriminating unit 117 (FIG. 25) in the normal state assumes that the seismic motion information is transmitted in the transmission pattern described above, and the first OFDM frame after power-on is detected even if no change in the value of the update flag is detected. The second OFDM frame information is acquired, and the seismic motion information acquisition process is performed. 35, 3506 and 3507 in FIG. 35 correspond to the first OFDM frame and the second OFDM frame which are received after the power is turned on and which performs the seismic motion information acquisition process. As for the received earthquake motion warning information, the signal identification value shown in FIG. 5 is confirmed in the data discrimination storage unit 2506 (FIG. 25) as in the case of FIGS. When the value of the signal identification is “000: Detailed earthquake motion warning information (there is a corresponding area)” shown in FIG. 9, the earthquake motion warning detailed information shown in FIG. 5, FIG. 10, FIG. To remember. In this embodiment, as the ground motion information, “region information” having a page type value “0” and “seismic source information” having a page type value “1” are alternately transmitted. Depending on the timing of turning on the power, the order of receiving “regional information” and “seismic source information” may be reversed, but within the 4 OFDM frames from the start of receiving the first earthquake motion warning detailed information, Both “seismic source information” and ground motion information can be acquired. Further, even if the order of receiving “region information” and “seismic source information” is reversed, it can be discriminated by the value of the page type, so that no problem occurs in the reception processing. Also in this case, as in the case of FIGS. 35 and 3510, even if the acquisition of the seismic motion warning information fails at the first timing, the seismic motion warning information is re-established in the second and fourth OFDM frames after the power is turned on for the second time. Can be acquired.

    Thereafter, after the first information is acquired, the first OFDM frame (3502) and the third OFDM frame (3503) at the time of detection are detected when a change in the value of the update flag is detected, as in the processing of FIGS. 35 and 3510. The acquisition process of the earthquake motion warning information received in.

  As described above, the same effect as that of the digital broadcast receiver of FIGS. 35 and 3510 can be obtained, and even when the earthquake motion warning information has already been issued when the power is turned on, the earthquake motion warning information can be quickly acquired and quickly In addition, a warning can be transmitted to the viewer.

  An eighth embodiment according to the present invention will be described with reference to FIG.

  The seventh embodiment is an example in which seismic motion information is repeatedly transmitted twice in units of OFDM frames in the order of “page type”, “1: epicenter information”, and “0: area information”. That is, in this example, “1: epicenter information”, “1: seismic source information”, “0: area information”, and “0: area information” are transmitted in one set.

    3601: An emergency earthquake bulletin from the Japan Meteorological Agency has not been received. As with 3301 of the fifth embodiment, all bits are transmitted with “1”, and immediately after receiving the first earthquake early warning 3300, the “start / end flag” is changed from “11” to “00”, and an earthquake motion warning is issued. Start sending information.

    3602: An OFDM frame for transmitting first earthquake motion warning information. As in 3302 of the fifth embodiment, the “start / end flag” is changed from “11” to “00” indicating “start”. The “update flag” is set to “00” which is a start value. “Signal identification” is “000” indicating “detailed information on earthquake motion warning (with corresponding area)” if the target area of the earthquake motion warning is within the broadcast area, and “detailed information on earthquake motion warning (without corresponding area)” when there is not. Set “001”. In this embodiment, “000” is set. The seismic motion information is alternately transmitted twice in the order of “page type”, “1: seismic source information”, and “0: area information”. Therefore, the first seismic motion warning information transmission OFDM frame is set to “page type” “1”. And send “seismic source information”.

    3603: This is an OFDM frame for transmitting the second earthquake motion warning information. The earthquake motion warning information sent at 3602 is sent again.

    3604: This is an OFDM frame for sending third earthquake motion warning information. The “start / end flag”, “update flag”, and “signal identification” continue to be 3602. The earthquake motion information is set to “page type” “0”, and “region information” is transmitted.

    3605: An OFDM frame for sending fourth earthquake motion warning information. The earthquake motion warning information sent at 3604 is sent again.

    Thereafter, while the “start / end flag” is “00”, the seismic motion warning information including “seismic source information” and the seismic motion warning information including “region information” are alternately and twice in units of OFDM frames, that is, 3602 and 3603. , 3604 and 3605 are repeatedly sent.

  As described above, the digital broadcast transmission apparatus according to the present embodiment can provide the same effects as the digital broadcast transmission apparatus according to the sixth embodiment. In addition, by sending earthquake motion warning information in a transmission pattern in which “seismic source information” and “region information” are sent twice alternately, it is easy to obtain earthquake motion warning information even when the reception status is not so good Can be expected.

    Next, FIG. 1, FIG. 25, and FIG. 36 show the receiver operation when the “seismic source information” and the “region information” are alternately transmitted twice in this order in OFDM frame units in the earthquake motion warning information. It explains using. About FIG. 1, FIG. 25, the description about the content described in Example 1 is omitted.

    36 and 3610 show the reception processing operation of the digital broadcast receiving apparatus that always performs the seismic motion warning information acquisition processing. In this embodiment, the seismic motion warning information transmitted from the digital broadcast transmitting device is in the order of “page type”, “1: seismic source information”, “1: seismic source information”, “0: regional information”, “0: regional information”. Thus, this is assumed to be a transmission pattern transmitted in units of OFDM frames.

  As described in the first embodiment, the AC decoding unit 116 (FIG. 1) monitors the start / end flag of the earthquake motion warning information, and from the start / end flag “11: No detailed earthquake motion information” to “00: Detailed earthquake motion information”. The change to “Yes” is detected, and the control unit 118 (FIG. 1) is notified of the seismic motion warning information, and the control unit 118 uses this as a trigger to send a control signal to put the determination unit 117 (FIG. 1) in the normal state. Send and start processing for earthquake alarm. The discriminating unit 117 (FIG. 25) that has entered the normal state performs the receiving process of the seismic motion information transmitted in the above-described transmission pattern when detecting a change in the value of the update flag. That is, information on the first OFDM frame (3602) and the third OFDM frame (3604) in which a change in the value of the update flag is detected is acquired, and the seismic motion information reception process is performed. The received earthquake motion warning information is confirmed by the data discrimination storage unit 2506 (FIG. 25) for the signal identification value shown in FIG. When the value of the signal identification is “000: Detailed earthquake motion warning information (there is a corresponding area)” shown in FIG. 9, the earthquake motion warning detailed information shown in FIG. 5, FIG. 10, FIG. To remember. In this embodiment, the seismic motion information is alternately transmitted as “seismic source information” having a page type value “1” and “region information” having a page type value “0”. Therefore, in the information of the data discrimination storage unit 2506, the storage of “region information” is updated when the OFDM frame (3602) at the time of detection is received, and the storage of “seismic source information” is updated when the third OFDM frame (3604) after the detection is received. In addition, it is possible to acquire both “seismic source information” and “region information” in 3 OFDM frames. Even if the acquisition of the seismic motion warning information fails due to the reception of the OFDM frame 3602 and the reception of the OFDM frame 3604, the “seismic source information” and the “region information” are reacquired in the OFDM frame 3603 and the OFDM frame 3605. It is possible to obtain both information in 4 OFDM frames.

    Since the update flag always changes from “11” to “00” at the timing of detecting the earthquake motion warning information, the determination unit 117 always acquires and updates the earthquake motion warning information. Since the processing unit 2509 generates warning information to be transmitted to the viewer as a video signal or an audio signal every time the storage in the data discrimination storage unit 2506 is updated, the latest information can always be provided to the viewer. .

    As described above, this embodiment can provide the same effects as those of the sixth embodiment.

    Furthermore, since “regional information” and “seismic source information” are alternately transmitted twice, it can be expected that the earthquake motion warning information can be easily obtained even when the reception state is not so good.

    36 and 3620 show the reception processing operation of the digital broadcast receiver that performs the seismic motion warning information acquisition processing only when the power is turned on.

    When power is turned on (3630), AC decoding unit 116 starts monitoring the start / end flag of the earthquake motion warning information. When the power is turned on, the earthquake motion warning information may have already been issued. First, the value of the start / end flag is confirmed. If “00: Detailed earthquake motion information exists”, the control unit 118 is notified of the earthquake motion warning. Communicate that information is being reported. In response to this, the control unit 118 sends a control signal for bringing the determination unit 117 into a normal state, and starts a process corresponding to the earthquake motion warning.

    Even if the determination unit 117 (FIG. 25) in the normal state does not detect a change in the value of the update flag, the first received OFDM frame (3606) after the power is turned on (3630) and the power is turned on. The seismic motion warning information received in the later third OFDM frame (3607) is acquired. In the received earthquake motion warning information, the signal identification value shown in FIG. 5 is confirmed in the data discrimination storage unit 2506 (FIG. 25), as in the case of FIGS. When the value of the signal identification is “000: Detailed earthquake motion warning information (there is a corresponding area)” shown in FIG. 9, the earthquake motion warning detailed information shown in FIG. 5, FIG. 10, FIG. To remember. In this embodiment, as the ground motion information, “region information” having a page type value “0” and “seismic source information” having a page type value “1” are alternately transmitted. Depending on the timing of turning on the power, the order of receiving “Regional information” and “Earthquake information” may be reversed, but within three OFDM frames from the start of receiving the first earthquake motion warning detailed information when the power is turned on, Both “seismic source information” and ground motion information can be acquired. Further, even if the order of receiving “region information” and “seismic source information” is reversed, it can be discriminated by the value of the page type, so that no problem occurs in the reception processing. Also in this case, as in the case of FIGS. 35 and 3510, even if the acquisition of the seismic motion warning information fails at the first timing, the seismic motion warning information is re-established in the second and fourth OFDM frames after the power is turned on for the second time. Can be acquired.

    After the first information is acquired, the first OFDM frame (3602) at the time of detection and the third OFDM after the update detection are detected when a change in the value of the update flag is detected, as in the processes of FIGS. 36 and 3610. The acquisition processing of the earthquake motion warning information received in the frame (3603) is performed.

  As described above, the same effects as those of the digital broadcast receiving apparatus of FIGS. 36 and 3610 can be obtained, and even when the earthquake motion warning information has already been issued when the power is turned on, the earthquake motion warning information can be quickly acquired and quickly In addition, a warning can be transmitted to the viewer.

  Embodiment 9 according to the present invention will be described with reference to FIG.

  The ninth embodiment is an example in which only “page type” and “0: area information” of earthquake motion information are repeatedly transmitted. When only “page type” and “0: area information” are transmitted, this represents a case where only the target area information can be acquired by the earthquake early warning.

  3701: An emergency earthquake bulletin from the Japan Meteorological Agency has not been received. As with 3301 of the fifth embodiment, all bits are transmitted with “1”, and immediately after receiving the first earthquake early warning 3300, the “start / end flag” is changed from “11” to “00”, and an earthquake motion warning is issued. Start sending information.

  3702: This is an OFDM frame for sending the first earthquake motion warning information. As in 3302 of the fifth embodiment, the “start / end flag” is changed from “11” to “00” indicating “start”. The “update flag” is set to “00” which is a start value. “Signal identification” is determined from information on the target area obtained from the earthquake early warning. If the target area is within the broadcast area, “000” indicating “earthquake motion warning detailed information (with corresponding area)” is set, and if not, “earthquake motion warning detailed information (without corresponding area)” and “001” are set. In this embodiment, “000” is set. The earthquake motion information is set to “page type” and “0: regional information”, and “local information” is transmitted.

    Thereafter, while the “start / end flag” is “00”, the seismic motion warning information including “region information” is continuously transmitted in units of OFDM frames.

  By sending earthquake motion warning information as described above, even when complete information could not be obtained from the Japan Meteorological Agency's earthquake early warning, that is, only “page type” and “0: regional information” could be obtained. Earthquake motion information can be sent immediately to a digital broadcast receiver.

  Even if both the target area information and the epicenter information can be acquired by the emergency earthquake warning from the Japan Meteorological Agency, a transmission method of repeatedly transmitting only “page type” and “0: area information” may be used. In this case, the digital broadcast receiver does not need to implement the acquisition process of “page type” “1: epicenter information”, and there is an advantage that the configuration of the digital broadcast receiver can be simplified.

  A tenth embodiment according to the present invention will be described with reference to FIG.

  The ninth embodiment is an example in which only “page type” “1: seismic source information” of earthquake motion information is repeatedly transmitted. Information on “Signal Identification” when there is one seismic motion warning, and there is a corresponding area for signal identification, the broadcast area indicating none and the area allocation granularity of “Page Type” and “0: Target Area” are equal. Can also represent “page type” and “0: target area”. In such a case, only “page type” “1: epicenter information” is repeatedly sent.

  For example, if the broadcast area is Aomori Prefecture, “Page Type” “0: Target Area” (FIG. 11) is also assigned in Aomori Prefecture, so the areas of “Signal Identification” and “Page Type” “0: Target Area” Allocation granularity is equal. On the other hand, when the broadcasting area is the Tokyo metropolitan area, the area includes Tokyo, Chiba Prefecture, Kanagawa Prefecture, Saitama Prefecture, and the like. As for the area allocation of “page type” and “0: target area”, Tokyo, Chiba prefecture, Kanagawa prefecture, and Saitama prefecture are allocated as individual areas. That is, the area allocation granularity of “signal identification” and “page type” “0: target area” are different.

  Thus, when the area allocation granularity of “signal identification” and “page type” “0: target area” is equal as in the former case, “page type” “0: target area” is indicated by the information of “signal identification”. Can also be expressed. Therefore, “page type” “0: target area” is not transmitted, but only “page type” “1: epicenter information” is repeatedly transmitted.

    3801: An emergency earthquake bulletin from the Japan Meteorological Agency has not been received. As with 3301 of the fifth embodiment, all bits are transmitted with “1”, and immediately after receiving the first earthquake early warning 3300, the “start / end flag” is changed from “11” to “00”, and an earthquake motion warning is issued. Start sending information.

  3802: OFDM frame for sending first earthquake motion warning information. As in 3302 of the fifth embodiment, the “start / end flag” is changed from “11” to “00” indicating “start”. The “update flag” is set to “00” which is a start value. “Signal identification” is set to “000” indicating “earthquake motion warning detailed information (with corresponding area)” when the target area is within the broadcasting area. The seismic motion information is set to “page type” “1: seismic source information” and “seismic source information” is transmitted on the premise that the area allocation granularity of “signal identification” and “page type” “0: target area” is equal. .

    Thereafter, while the “start / end flag” is “00”, seismic motion warning information including “seismic source information” is continuously transmitted in units of OFDM frames.

  As described above, when the area allocation granularity of “signal identification” and “page type” “0: target area” is equal, only “page type” “1: seismic source information” is transmitted, and processing on the receiver side The effect that can be simplified can be expected.

  An eleventh embodiment according to the present invention will be described with reference to FIG.

  The ninth embodiment is an example in which “page type” “0” of earthquake motion information is repeatedly transmitted with all “earth motion information” being 1. This method is used to send notifications only when an earthquake early warning from the Japan Meteorological Agency has been issued.

    3901: An emergency earthquake bulletin from the Japan Meteorological Agency has not been received. As with 3301 of the fifth embodiment, all bits are transmitted with “1”, and immediately after receiving the first earthquake early warning 3300, the “start / end flag” is changed from “11” to “00”, and an earthquake motion warning is issued. Start sending information.

  3902: This is an OFDM frame for sending the first earthquake motion warning information. As in 3302 of the fifth embodiment, the “start / end flag” is changed from “11” to “00” indicating “start”. The “update flag” is set to “00” which is a start value. “Signal identification” is set to “000” indicating “earthquake motion warning detailed information (there is a corresponding area)” when the target area is within the broadcasting area. In order to notify only that the earthquake early warning has been issued, the earthquake motion information is set to “page type” “0: epicenter information” and all bits of “earthquake motion information” are transmitted as “1”.

    Thereafter, while the “start / end flag” is “00”, the seismic motion warning information 3902 is continuously transmitted in units of OFDM frames.

    By transmitting the earthquake motion warning information by the method as described above, it is possible to notify the receiver only that an emergency earthquake warning has been issued. Since “regional information” and “seismic source information” are not sent out, it is not necessary to extract and generate such information from the earthquake early warning from the Japan Meteorological Agency, and the effect of simplifying the configuration of the digital broadcasting transmission apparatus can be expected. Since only the fact that the earthquake early warning has been issued needs to be processed on the receiver side, an effect of reducing the load of reception processing can be expected.

  A twelfth embodiment according to the present invention will be described with reference to FIG.

  The seventh embodiment is an example in which earthquake motion information is repeatedly transmitted in units of OFDM frames in the order of “page type”, “0: regional information”, “0: epicenter information”, and “1: seismic source information”. These “0”, “0” and “1” are transmitted as one set of transmission units.

  In this way, it is considered that frames transmitted continuously can be easily acquired by a digital broadcast receiver by changing the transmission frequency of “0: area information” and “1: epicenter information”. Further, in the case of a digital broadcast receiver that performs an acquisition process of earthquake motion warning information only when the power is turned on, there is a high probability that earthquake motion information that is frequently transmitted will be acquired first when the power is turned on. In addition, the digital broadcast receiver that always performs the process of acquiring the earthquake motion warning information always acquires the first earthquake motion information. For this reason, when adjusting the seismic motion information to be preferentially acquired at the transmission frequency, it is desirable to transmit the priority seismic motion information continuously several OFDM from the head of the transmission unit.

  This embodiment is an example in which “0: regional information” is preferentially acquired, and “0: regional information” has a probability of two-thirds for a digital broadcast receiver that acquires and processes earthquake motion information only when the power is turned on. This is a case where the transmission of seismic motion information is adjusted so that can be acquired first.

    4001: An emergency earthquake bulletin from the Japan Meteorological Agency has not been received. As with 3301 of the fifth embodiment, all bits are transmitted with “1”, and immediately after receiving the first earthquake early warning 3300, the “start / end flag” is changed from “11” to “00”, and an earthquake motion warning is issued. Start sending information.

    4002: An OFDM frame for transmitting first earthquake motion warning information. As in 3302 of the fifth embodiment, the “start / end flag” is changed from “11” to “00” indicating “start”. The “update flag” is set to “00” which is a start value. “Signal identification” is “000” indicating “detailed information on earthquake motion warning (with corresponding area)” if the target area of the earthquake motion warning is within the broadcast area, and “detailed information on earthquake motion warning (without corresponding area)” when there is not. Set “001”. In this embodiment, “000” is set. Since the seismic motion information is transmitted in units of “page type”, “0: regional information”, “0: regional information”, and “1: seismic source information”, “page type” “0” in the first OFDM frame for transmitting earthquake motion warning information. "And send" Regional information ".

    4003: An OFDM frame for transmitting second earthquake motion warning information. The earthquake motion warning information sent at 4002 is sent again.

    4004: An OFDM frame for transmitting third earthquake motion warning information. The “start / end flag”, “update flag”, and “signal identification” continue to be set to 4002. The earthquake motion information is set to “page type” “1”, and “seismic source information” is transmitted.

    Thereafter, while the “start / end flag” is “00”, the transmission is continued repeatedly in units of 4002, 4003, and 4004.

  By sending seismic motion warning information in the manner described above, the digital broadcast receiver that acquires and processes seismic motion warning information only when the power is turned on is adjusted so that “0: regional information” is first acquired preferentially. Is possible. Since the “region information” is received first, it is expected that the receiver can immediately notify the viewer whether or not the installation location of the receiver is the target region of the earthquake motion warning information.

  A thirteenth embodiment according to the present invention will be described with reference to FIG.

  Embodiment 7 is an example in which earthquake motion information is repeatedly transmitted in units of OFDM frames in the order of “page type”, “1: epicenter information”, “1: seismic source information”, and “0: area information”. These “1”, “1” and “0” are transmitted as one set of transmission units.

    This embodiment is an example of preferentially acquiring “1: seismic source information”. A digital broadcast receiver that acquires and processes seismic motion information only when the power is turned on has a probability of two thirds “0: regional information”. This is a case where the transmission of seismic motion information is adjusted so that can be acquired first.

    4101: An emergency earthquake bulletin from the Japan Meteorological Agency has not been received. As with 3301 of the fifth embodiment, all bits are transmitted with “1”, and immediately after receiving the first earthquake early warning 3300, the “start / end flag” is changed from “11” to “00”, and an earthquake motion warning is issued. Start sending information.

    4102: This is an OFDM frame for sending the first earthquake motion warning information. As in 3302 of the fifth embodiment, the “start / end flag” is changed from “11” to “00” indicating “start”. The “update flag” is set to “00” which is a start value. “Signal identification” is “000” indicating “detailed information on earthquake motion warning (with corresponding area)” if the target area of the earthquake motion warning is within the broadcast area, and “detailed information on earthquake motion warning (without corresponding area)” when there is not. Set “001”. In this embodiment, “000” is set. The seismic motion information is transmitted in units of “page type”, “1: seismic source information”, “1: seismic source information”, and “0: regional information”. Therefore, in the first seismic motion warning information transmission OFDM frame, “page type” “1” ”And send“ seismic source information ”.

    4103: An OFDM frame for sending second earthquake motion warning information. The earthquake motion warning information sent in 4102 is sent again.

    4104: An OFDM frame for sending third earthquake motion warning information. The “start / end flag”, “update flag”, and “signal identification” continue to be set to 4002. The earthquake motion information is set to “page type” “0”, and “region information” is transmitted.

    Thereafter, while the “start / end flag” is “00”, it continues to be repeatedly sent in units of 4102, 4103 and 4104.

  By sending seismic motion warning information as described above, the digital broadcast receiver that acquires and processes seismic motion warning information only when the power is turned on first adjusts "1: seismic source information" first. It becomes possible to do. By preferentially acquiring the “seismic source information”, the receiver side can expect an effect that the “seismic source information” and the “region information” can be easily associated with each other when there is a plurality of pieces of earthquake motion information.

  A fourteenth embodiment according to the present invention will be described with reference to FIG.

  The present embodiment describes the case where two earthquakes have occurred in the method for transmitting earthquake motion information described in the fifth embodiment.

  In the fifth embodiment, a transmission method is shown in which earthquake motion information is repeatedly and repeatedly transmitted in units of OFDM frames in the order of “page type”, “0: area information”, and “1: seismic source information”. In this embodiment, a pair of seismic motion information of “page type”, “0: area information”, and “1: seismic source information” (hereinafter referred to as a seismic motion information pair) is used as a transmission unit, and the seismic motion information of the first earthquake Two pieces of ground motion information are transmitted by a method of alternately and repeatedly transmitting the ground motion information of the second earthquake.

  FIG. 42 shows a method of transmitting ground motion information in a state where two earthquakes, earthquakes A and B are occurring. Earthquake A is the first earthquake and B is the second. In the figure, 4201, 4202, 4203, and 4204 are earthquake motion information pairs by pairs of “page type”, “0: area information”, and “1: seismic source information”, respectively. 4201 and 4203 are earthquake motion information pairs of earthquake A, 4202 and 4204 are earthquake motion warning pairs of earthquake B. As shown in the figure, earthquake motion information pairs of earthquakes A and B are alternately sent in the order of occurrence of the earthquakes 4201, 4202, 4203, and 4204.

  As described above, while the same information is repeatedly transmitted, the “update flag” does not increment and maintains the same value.

  The “page type” and “1: seismic source information” include information for identifying the seismic motion information of two earthquakes when they are transmitted. “Total number of seismic motion information” for identifying the total number of transmitted seismic motion information and “Earthquake information identifying” for identifying the seismic motion information being transmitted. “Total number of seismic motion information” is set to “0” when the total number of transmitted seismic motion information is one, and “1” when two. In the case of the present embodiment, since the ground motion information of two earthquakes is transmitted, “1” is obtained. “Seismic motion information identification” is set to “0” when the transmitted ground motion information is the first information and “1” when the second information is the second information. In this embodiment, since the earthquake motion information is transmitted in the order of occurrence, the “earthquake motion information identification” of the first earthquake A is “0” (4212), and the “earthquake motion information identification” of the first earthquake A is “1” (4214) is set.

  As described above, by specifying the transmission pattern and transmitting the earthquake motion warning information, the digital broadcast receiving apparatus can easily identify the earthquake motion information of the two earthquakes. In addition, the digital broadcast receiving apparatus can quickly acquire both “regional information” and “seismic source information” for earthquake A and earthquake B, regardless of the timing of earthquake motion warning information acquisition. In addition, since the “region information” is received first, it can be expected that the receiver can immediately notify the viewer whether or not the installation location of the receiver is the target region of the earthquake motion warning information. In addition, since “regional information” of the earthquake motion information of two earthquakes is acquired separately, if it is the corresponding region of both “regional information” of the two earthquakes, an effect such as notifying a strong warning to the viewer is expected. it can.

  Embodiment 15 according to the present invention will be described with reference to FIG.

  The present embodiment describes the case where two earthquakes have occurred in the method for transmitting earthquake motion information described in the sixth embodiment.

  In the sixth embodiment, a transmission method is shown in which earthquake motion information is repeatedly and repeatedly transmitted in units of OFDM frames in the order of “page type”, “1: seismic source information”, and “0: regional information”. In the present embodiment, the transmission unit of “1: seismic source information” and “0: regional information” transmits the ground motion information of the first earthquake and the ground motion information of the second earthquake alternately and repeatedly in the order of 2 1 earthquake motion information is sent out.

    FIG. 43 shows a method of transmitting ground motion information in a state where two earthquakes, earthquakes A and B are occurring. Earthquake A is the first earthquake and B is the second. In the figure, reference numerals 4301, 4302, 4303, and 4304 denote earthquake motion information pairs that are pairs of “page type”, “1: epicenter information”, and “0: area information”, respectively. Reference numerals 4301 and 4303 are earthquake motion information pairs for earthquake A, and 4302 and 4304 are earthquake motion warning pairs for earthquake B. As shown in the drawing, earthquake motion information pairs of earthquakes A and B are alternately sent in the order of occurrence of earthquakes 4301, 4302, 4303, and 4304.

    As described above, while the same information is repeatedly transmitted, the “update flag” does not increment and maintains the same value.

    The “page type” and “1: seismic source information” include information for identifying the seismic motion information of two earthquakes when they are transmitted. “Total number of seismic motion information” for identifying the total number of transmitted seismic motion information and “Earthquake information identifying” for identifying the seismic motion information being transmitted. “Total number of seismic motion information” is set to “0” when the total number of transmitted seismic motion information is one, and “1” when two. In the case of the present embodiment, since the ground motion information of two earthquakes is transmitted, “1” is obtained. “Seismic motion information identification” is set to “0” when the transmitted ground motion information is the first information and “1” when the second information is the second information. In this embodiment, since the earthquake motion information is transmitted in the order of occurrence, the “earthquake motion information identification” of the first earthquake A is “0” (4311) and the “earthquake motion information identification” of the first earthquake A is It is set to “1” (4313).

    As described above, as in the fourteenth embodiment, by defining the transmission pattern and transmitting the earthquake motion warning information, the digital broadcast diagnosis apparatus can easily identify the earthquake motion information of the two earthquakes. In addition, the digital broadcast receiving apparatus can quickly acquire both “regional information” and “seismic source information” for earthquake A and earthquake B, regardless of the timing of earthquake motion warning information acquisition.

  Further, in the fifteenth embodiment, since “page type” “1: epicenter information” is transmitted as the first information of the transmission pattern, the digital broadcast receiving apparatus can first know that two pieces of earthquake motion information are transmitted. . Therefore, the receiver can promptly notify the viewer that two earthquake motion warnings have been issued. Furthermore, the determination when the number of earthquake motion warnings is changed from one to two becomes easy.

  A sixteenth embodiment according to the present invention will be described with reference to FIG.

  The present embodiment is an example of a method for transmitting ground motion information when two earthquakes are occurring.

  In the present embodiment, the first earthquake page type “1: epicenter information”, the second earthquake page type “1: epicenter information”, and the first earthquake page type “0: regional information”. The second earthquake page type “0: area information” is used as a transmission unit, and two pieces of earthquake motion information are transmitted in a transmission pattern that is repeatedly transmitted in this transmission unit.

    FIG. 44 shows a transmission pattern of ground motion information in a state where two earthquakes, earthquakes A and B are occurring. In the figure, 4401 and 4402 are one unit of the transmission pattern of the seismic motion information in this embodiment. First earthquake and earthquake A page type “1: Epicenter information” (4411) in OFDM frame unit, second earthquake and earthquake B page type “1: Epicenter information” (4412), earthquake A page The data is sent in the order of type “0: area information” (4413) and earthquake B page type “0: area information” (4414). Then, one unit of this transmission pattern is repeatedly transmitted.

    As described above, while the same information is repeatedly transmitted, the “update flag” does not increment and maintains the same value.

    The “page type” and “1: seismic source information” include information for identifying the seismic motion information of two earthquakes when they are transmitted. “Total number of seismic motion information” for identifying the total number of transmitted seismic motion information and “Earthquake information identifying” for identifying the seismic motion information being transmitted. “Total number of seismic motion information” is set to “0” when the total number of transmitted seismic motion information is one, and “1” when two. In the case of the present embodiment, since the ground motion information of two earthquakes is transmitted, “1” is obtained. “Seismic motion information identification” is set to “0” when the transmitted ground motion information is the first information and “1” when the second information is the second information. In this embodiment, since the earthquake motion information is transmitted in the order of occurrence, the “earthquake motion information identification” of the first earthquake A is “0” (4411) and the “earthquake motion information identification” of the first earthquake A is “1” (4412) is set.

  As described above, as in the fourteenth embodiment, by defining the transmission pattern and transmitting the earthquake motion warning information, the digital broadcast diagnosis apparatus can easily identify the earthquake motion information of the two earthquakes. In addition, the digital broadcast receiving apparatus can quickly acquire both “regional information” and “seismic source information” for earthquake A and earthquake B, regardless of the timing of earthquake motion warning information acquisition.

  Similarly to the fifteenth embodiment, since “page type” “1: epicenter information” is transmitted as the first information of the transmission pattern, the digital broadcast receiving apparatus first knows that two pieces of earthquake motion information are transmitted. Can do. Therefore, the receiver can promptly notify the viewer that two earthquake motion warnings have been issued. Furthermore, the determination when the number of earthquake motion warnings is changed from one to two becomes easy.

  Embodiment 17 according to the present invention will be described with reference to FIG.

  The present embodiment is an example of a method for transmitting ground motion information when two earthquakes are occurring.

    In the present embodiment, the page type “1: epicenter information” of the first earthquake, the page type “1: epicenter information” of the second earthquake, and a page including information on both the first and second earthquakes. The type “0: area information” is used as a transmission unit, and two pieces of earthquake motion information are transmitted in a transmission pattern that is repeatedly transmitted in this transmission unit.

    FIG. 45 shows a transmission pattern of ground motion information in a state where two earthquakes, earthquakes A and B are occurring. In the figure, reference numerals 4501 and 4502 denote one unit of the transmission pattern of the earthquake motion information in the present embodiment. Page type “1: Earthquake information” for the first earthquake and earthquake A in OFDM frame units (4411), Page type “1: Earthquake information” for the second earthquake and earthquake B (4412), Earthquake A, earthquake The information is transmitted in the order of page type “0: area information” (4413) including both pieces of information. Then, one unit of this transmission pattern is repeatedly transmitted.

    As described above, while the same information is repeatedly transmitted, the “update flag” does not increment and maintains the same value.

    The “page type” and “1: seismic source information” include information for identifying the seismic motion information of two earthquakes when they are transmitted. “Total number of seismic motion information” for identifying the total number of transmitted seismic motion information and “Earthquake information identifying” for identifying the seismic motion information being transmitted. “Total number of seismic motion information” is set to “0” when the total number of transmitted seismic motion information is one, and “1” when two. In the case of the present embodiment, since the ground motion information of two earthquakes is transmitted, “1” is obtained. “Seismic motion information identification” is set to “0” when the transmitted ground motion information is the first information and “1” when the second information is the second information. In this embodiment, since the earthquake motion information is transmitted in the order of occurrence, the “earthquake motion information identification” of the first earthquake A is “0” (4411) and the “earthquake motion information identification” of the first earthquake A is “1” (4412) is set.

  Information including the target areas of both earthquake A and earthquake B is transmitted to “page type” and “0: area information”. As an example, it is assumed that the target areas of earthquake A are Tokyo, Chiba prefecture, and Kanagawa prefecture, and the target areas of earthquake B are Kanagawa prefecture, Shizuoka prefecture, and Izu islands. In this case, “page type” and “0: area information” are set as values indicating Tokyo, Chiba prefecture, Kanagawa prefecture, Shizuoka prefecture, and Izu islands as target areas.

  As described above, as in the fourteenth embodiment, by defining the transmission pattern and transmitting the earthquake motion warning information, the digital broadcast diagnosis apparatus can easily identify the earthquake motion information of the two earthquakes. In addition, the digital broadcast receiving apparatus can quickly acquire both “regional information” and “seismic source information” for earthquake A and earthquake B, regardless of the timing of earthquake motion warning information acquisition.

  Furthermore, since “page type” “1: epicenter information” is transmitted as the first information of the transmission pattern as in the fifteenth embodiment, the digital broadcast receiving apparatus first knows that two pieces of earthquake motion information are transmitted. It is easy to make a determination when switching from the state in which ground motion information of one earthquake is transmitted to the transmission of ground motion of two earthquakes.

  Furthermore, by making the “region information” information including both earthquake A and earthquake B, the time required for the earthquake motion information of two earthquakes can be reduced by 1 OFDM.

DESCRIPTION OF SYMBOLS 101 ... Antenna 102 ... Channel selection part 103 ... Orthogonal demodulation part 104 ... Fast Fourier transform (FFT) part 105 ... Demodulation decoding part 106 ... Descramble part 107 ... Demax part 108 ... Decoding part 109 ... Video output part 110 ... Audio | voice output part 111 ... Synchronous playback unit 112 ... Frame extraction unit 113 ... TMCC decoding unit 114, 115 ... Switching unit 116 ... AC decoding unit 117 ... Discrimination unit 118 ... Control unit 119 ... Broadcast reception unit 120 ... Earthquake motion warning information reception unit 121 ... Digital broadcast reception Apparatus 201 ... Information source encoding unit 202 ... MPEG2 multiplexing unit 203 ... TS remultiplexing unit 204 ... RS (Reed-Solomon) encoding unit 205 ... Hierarchy division unit 206a, b, c ... Parallel processing unit 207 ... Hierarchy synthesis unit 208: Time interleaving unit 209 ... Frequency interleaving unit 210 ... OFDM frame configuration unit 211 ... Reverse high speed Fourier transform (IFFT) unit 212 ... guard interval addition unit 213 ... transmission unit 214 ... pilot signal configuration unit 215 ... TMCC signal configuration unit 216 ... AC signal configuration unit 2501, 2503, 2512 ... input 2502 ... error correction detection unit 2504 ... clock Unit 2505 ... current time setting unit 2506 ... data judgment storage unit 2507 ... comparison judgment unit 2508 ... buzzer sound generation unit 2509 ... processing unit 2510 ... video signal output 2511 ... audio signal output 2601, 2602 ... synthesis unit 2701 ... input 2703 ... video System decoding unit 2704 ... Audio system decoding unit 2705 ... Movie plane display memory 2706 ... Still image plane display memory 2707 ... Movie still image switching plane display memory 2708 ... Character graphic plane display memory 2709 ... Subtitle plane display memory for displaying subtitles 271 ... switching unit 2711,2712,2714,2715 ... adjuster 2713,2716 ... adding unit 2717 ... data input 2718,2719 ... adjuster 2720 ... adding unit 27212725 ... output 2722,2723 ... adjuster 2724 ... adding unit

Claims (2)

Digital broadcast reception for receiving a transmission signal having a digital broadcast signal including a broadcast video signal or a broadcast audio signal, and an earthquake motion warning information signal including information configured by alternately repeating region information and source information of the earthquake motion warning A device,
A receiver for receiving the transmission signal;
A broadcast demodulation unit that demodulates the digital broadcast signal from a transmission signal received by the reception unit;
A seismic motion warning information demodulating unit that demodulates the seismic motion warning information signal from the transmission signal received by the receiving unit;
From the seismic motion warning information signal demodulated by the seismic motion warning information demodulating unit, a set of seismic motion warning area information and epicenter information is generated, and a video signal and an audio signal relating to seismic motion are generated and output;
A synthesizing unit that synthesizes a broadcast video signal or a broadcast audio signal of the digital broadcast signal demodulated by the broadcast demodulation unit and a video signal or an audio signal related to earthquake motion output from the determination unit;
As the video signal or audio signal related to earthquake motion is output from the discriminating unit, the synthesizing unit synthesizes the broadcast video signal or broadcast audio signal of the digital broadcast signal and the video signal or audio signal related to the earthquake motion. A control unit to control;
A digital broadcast receiving apparatus comprising: Digital broadcast reception for receiving a transmission signal having a digital broadcast signal including a broadcast video signal or a broadcast audio signal, and an earthquake motion warning information signal including information configured by alternately repeating region information and source information of the earthquake motion warning A method,
A receiving step for receiving the transmission signal;
A broadcast demodulation step of demodulating the digital broadcast signal from the transmission signal received in the reception step;
A seismic motion warning information demodulating step for demodulating the seismic motion warning information signal from the transmission signal received in the receiving step;
From the seismic motion warning information signal demodulated in the seismic motion warning information demodulating step, a set of seismic motion warning area information and epicenter information is obtained, and a video signal and an audio signal relating to seismic motion are generated and output; and
A synthesis step of synthesizing a broadcast video signal or broadcast audio signal of the digital broadcast signal demodulated in the broadcast demodulation step and a video signal or audio signal related to earthquake motion output from the discrimination step; from the discrimination step In accordance with the output of the video signal or audio signal related to the earthquake motion, the synthesizing step combines the broadcast video signal or broadcast audio signal of the digital broadcast signal with the video signal or audio signal related to the earthquake motion. To receive digital broadcasts.

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