JP2012015930A - Digital broadcasting receiving device and digital broadcasting receiving method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmitting device and a receiving device for digital broadcasting that, almost without delay, can reproduce an earthquake early warning sent by digital broadcasting, and to provide their detailed operations.SOLUTION: A digital broadcasting receiving device receives digital broadcasting signals including broadcast image signals or broadcast sound signals, and transmission signals including AC signals by which earthquake motion alarming information is transmitted. The digital broadcasting receiving device comprises: plural receiving units that receive the transmission signals; an AC signal decoding unit that decodes plural AC signals from the transmission signals received by the plural receiving units; a discrimination unit that determines, in the plural earthquake motion alarming information, whether time information is normal and whether the information includes an information about a specific area or not. The discrimination unit selects and outputs an appropriate earthquake motion alarming information based on priority of channels of the transmission signals received by the plural receiving units when the time information is normal and the plural earthquake motion information includes the information about the specific area.

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 a block diagram which shows the structure of the digital broadcasting receiver which can receive the earthquake motion warning information which concerns on the 5th Embodiment of this invention. It is a flowchart which shows the key reception process 4000 which concerns on the 5th Embodiment of this invention. It is a flowchart which shows the key reception process 4000 which concerns on the 5th 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 6th 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 6th Embodiment of this invention. It is a flowchart which shows the key reception process 4000 which concerns on the 6th Embodiment of this invention. It is a flowchart which shows the key reception process 4000 which concerns on the 6th Embodiment of this invention. It is a flowchart which shows the key reception process 4000 which concerns on the 7th Embodiment of this invention. It is a flowchart which shows the key reception process 4100 in the confirmation screen which concerns on the 7th Embodiment of this invention. It is a flowchart which shows the key reception process 4000 which concerns on the 7th Embodiment of this invention. It is a flowchart which shows the seismic-motion warning information back reception setting process 5000 which concerns on the 8th Embodiment of this invention. It is explanatory drawing explaining an example of the receivable channel number list hold | maintained with the digital broadcast transmitter of this invention. It is explanatory drawing explaining an example of the back receiving channel priority list hold | maintained with the digital broadcast transmitter of this invention. It is explanatory drawing explaining an example of the back receiving channel candidate list produced | generated by the seismic-motion warning information back reception setting process 5000 of this invention. It is explanatory drawing which showed the example of the value of the structure identification in the AC signal received by each channel at the time of the channel scan which concerns on the 8th Embodiment of this invention. It is explanatory drawing explaining an example of the production | generation result of the back receiving channel priority list produced | generated dynamically with the digital broadcast transmitter of this invention. It is explanatory drawing which showed the example of the value of the structure identification in the AC signal received by each channel at the time of the channel scan which concerns on the 8th Embodiment of this invention, and the reception level of each channel. It is explanatory drawing explaining an example of the production | generation result of the back receiving channel priority list produced | generated dynamically with the digital broadcast transmitter 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 9th Embodiment of this invention. It is a block diagram which shows one Example of the discrimination | determination part 117 which is the main blocks of the 9th Embodiment of this invention. It is a flowchart which shows the comparison judgment process 6000 which concerns on the 9th Embodiment of this invention. It is a flowchart which shows the seismic-motion warning information selection process 7000 which concerns on the 9th Embodiment of this invention. It is a flowchart which shows the seismic-motion warning information selection process 7000a which concerns on the 9th Embodiment of this invention. It is explanatory drawing explaining an example of the display of the confirmation screen displayed by the error screen display process 4005 which concerns on the 10th Embodiment of this invention. It is explanatory drawing explaining an example of the display of the confirmation screen displayed by the confirmation screen display process 4006 which concerns on the 11th Embodiment 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 an 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 to perform 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, and 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 set to '000', '010', '011', '100', '101', '111', the AC is used for the broadcaster as before, and the transmission control of the modulated wave is performed. Transmit additional information.

  When the configuration identification is “001” or “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 the 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 and the broadcast audio signal of the normal television broadcast to the video signal and the 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 this case, the receiver returns to the normal operation. In the receiver operation of FIG. 22, 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.

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 the case of, the receiver returns to normal operation. In the receiver operation of FIG. 24, 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 ””.

  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.

  A fifth embodiment according to the present invention will be described with reference to FIGS. 33, 34 and 35. FIG.

  FIG. 33 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 digital television broadcasting.

  A user operation input unit 122 receives a user operation input such as channel switching from a button or a remote controller provided in the digital broadcast receiving apparatus, and notifies the control unit 118 as a key event.

  The difference between FIG. 1 and FIG. 33 is that a user input 122 is added.

  The key reception process 4000 executed when the control unit 118 receives a key event will be described below with reference to FIGS.

  First, the key reception process 4000 determines the type of the received key event. (S4001) The received key event is a channel UP key or channel DOWN key for switching to the next channel, a number key for switching directly to a desired channel, or the type of received broadcast (such as terrestrial digital broadcast or BS digital broadcast) If it is a channel switching operation key such as a broadcast type key for switching the type) or an input switching key for switching the display to an external input, the AC signal of the channel currently being received cannot be continuously received. move on. If it is a key event other than the above channel operation keys (for example, volume UP key, volume DOWN key, data broadcast key, etc.), the existing key event processing is performed without disturbing the display operation and sounding operation of the earthquake motion alarm information. Execute (S4003) and finish the process. The received key event processing may be a key event issued by operating a button or the like of a remote controller (remote controller), or a key event issued by operating a button or the like mounted on the digital broadcast receiver main body. either will do. Even if the digital broadcast receiving device operates a broadcast type key for switching the type of received broadcast (type such as terrestrial digital broadcast or BS digital broadcast) or an input switch key for switching display to an external input, If the AC signal of the channel cannot be continuously received and the AC signal can be received as it is, it is not determined as a channel switching operation key, and does not interfere with the display operation and sounding operation of the earthquake alarm information. The existing key event processing (S4003) is executed to finish the processing.

When the process proceeds to step S4002, it is determined from the seismic motion warning information receiving unit 120 whether or not the seismic motion warning is currently issued. If not, the information held by the seismic motion warning information receiving unit 120 is cleared, A channel selection switching process S4004 for switching to a channel is executed, and the process ends. If it is being issued, the key event is ignored and the channel selection switching process is not performed, and the process is terminated. (Step S4002)
When the seismic motion warning is being issued by the above key reception processing 4000, the channel selection switching by the user operation is invalidated.

  Further, if the digital broadcast receiver does not necessarily display the earthquake motion warning with the corresponding area and does not necessarily display the earthquake motion warning without the corresponding area, the key reception process 4000 as shown in FIG. 35 may be performed.

  The difference between FIG. 34 and FIG. 35 is that the branching condition in step S4002 has been changed to the condition that the earthquake motion warning is being issued and the earthquake motion warning being issued is in the relevant region. Channel selection switching by user operation is disabled only when the earthquake motion warning is received.

  In the present embodiment, there is an effect that it is possible to prevent the earthquake motion warning information transmitted using the AC signal from being received correctly by channel switching.

  A sixth embodiment according to the present invention will be described with reference to FIGS. 36, 37, 38 and 39. FIG.

  FIG. 36 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 digital television broadcasting.

  Reference numeral 122 denotes a user operation input unit similar to that of the fifth embodiment, and includes user operation inputs such as channel switching from a remote controller for remotely operating the digital broadcast receiver apparatus, and buttons provided on the digital broadcast receiver apparatus. A user operation input such as channel switching by pressing is notified to the control unit 118 as a key event.

  Reference numerals 2601 and 2602 denote synthesizing units, and FIG.

  The difference between FIG. 26 and FIG. 36 is that a user input 122 is added and inputs from the control unit 118 to the combining units 2601 and 2602 are added.

  In FIG. 37, in contrast to FIG. 27, the output of the addition unit 2720 and the output of the control unit 118 are combined by the adjustment units 2726 and 2727 and the addition unit 2728 as the output of the video, and the output of the addition unit The difference is that the output of 2724 and the output of the control unit 118 are combined by the adjustment units 2729 and 2730 and the addition unit 2731 and output.

  In the synthesizing unit 2601, the output signal of the adding unit 2720 is adjusted by the adjusting unit 2726 to the synthesis ratio “1−α5”, while the output signal from the control unit 118 is adjusted by the adjusting unit 2727 to the synthesis ratio “α5” times. To do. The output signals of the adjustment units 2726 and 2727 are combined by the addition unit 2728 and output to the output 2721 as a combined video signal. Here, α5 represents opacity and takes a value from 0 to 1. When α5 is 0, the composite video signal output from the output 2721 is only a composite signal of the broadcast video signal from the adder 2720 and the video signal of the earthquake motion warning information. When α5 is 1, the composite video signal is output from the output 2721. The synthesized video signal is only an output signal from the control unit 118.

  In the synthesis unit 2602, the output signal of the addition unit 2724 is adjusted by the adjustment unit 2729 to the synthesis ratio “1−α6” times, while the output signal from the control unit 118 is adjusted by the adjustment unit 2730 to the synthesis ratio “α6” times. To do. The output signals of the adjustment units 2729 and 2730 are synthesized by the addition unit 2731 and output to the output 2725 as a synthesized audio signal. Here, α6 represents a synthesis rate and takes a value from 0 to 1. When α6 is 0, the synthesized audio signal output from the output 2725 is only the synthesized signal of the broadcast audio signal from the adding unit 2724 and the audio signal of the earthquake motion warning information, and when α6 is 1, it is output from the output 2725. The synthesized voice signal is only the output signal from the control unit 118.

  The key reception process 4000 executed when the control unit 118 receives a key event in the present embodiment will be described below with reference to FIGS.

  The difference between FIG. 34 and FIG. 38 is that the error screen display process S4005 is executed when the earthquake motion warning is being issued in step S4002.

  The error screen display process S4005 is performed based on an output signal from the control unit 118.

  In error screen display processing S4005, an operation error screen is displayed to notify the user that the seismic motion warning is currently being issued and that the channel cannot be switched, and an operation error may occur due to time-out or operations other than the key for channel switching operation. The screen disappears. Note that a sound for notifying the user that the channel cannot be switched may be output.

  If the digital broadcast receiving apparatus displays a seismic motion warning with the corresponding area and does not display a seismic motion warning without the corresponding area, the key reception processing 4000 as shown in FIG. 39 may be performed.

  The difference between FIG. 38 and FIG. 39 is that the branching condition in step S4002 has been changed to a condition in which an earthquake motion warning is being issued and whether the earthquake motion warning being issued is in the corresponding region. Only when a certain earthquake motion warning is being received, an operation error screen is displayed to inform the user that the channel switching operation cannot be performed, so that the channel switching operation cannot be performed.

  A seventh embodiment according to the present invention will be described with reference to FIGS. 40, 41, and 42.

  40, the error screen display processing S4005 of FIG. 38 may display information different from the currently displayed earthquake motion warning information when the channel is switched, and it is confirmed to the user whether the channel switching is still executed. The confirmation screen display process S4006 is replaced.

  The confirmation screen display process S4006 is performed based on an output signal from the control unit 118.

  In confirmation screen display processing S4006, a confirmation screen for confirming whether or not to switch channels is displayed to the user.

  Furthermore, when the control unit 118 receives a key event from the user operation input unit 122 while the confirmation screen is displayed, the confirmation screen key reception processing 4100 in FIG. 41 is activated.

In FIG. 41, when the control unit 118 receives a key event, it determines the type of the received key. If the received key is a selection key for performing selection switching of “execute channel switching operation” or “cancel channel switching operation” displayed on the confirmation screen, the process proceeds to selection switching processing S4102. If the received key is a determination key for determining selection, the process advances to step S4103. If a key other than those described above is received, the process ends. (Step S4101)
Next, in step S4103, the user's selection is determined. If the user selects channel switching operation execution, the information stored in the seismic motion warning information receiving unit 120 is cleared and the channel switching to the target channel is performed so that the seismic motion warning information receiving process is correctly processed. The switching process S4104 is executed, and the process proceeds to the confirmation screen erasing process S4105. If the user selects canceling the channel switching operation, the process proceeds to the confirmation screen deleting process S4105 without performing the channel selection switching process. (Step S4103)
In confirmation screen erasure processing S4105, the video output of the confirmation screen currently being displayed is stopped, and the processing ends.

  Through the above processing, the user is informed that there is a possibility that information different from the currently displayed earthquake motion warning information will be displayed due to the channel switching, and the channel switching is executed for the user who still desires the channel switching. To.

  Further, if the digital broadcast receiving apparatus displays the earthquake motion warning with the corresponding area and does not display the earthquake motion warning without the corresponding area, the key reception processing 4000 as shown in FIG. 42 may be performed.

  The difference between FIG. 40 and FIG. 42 is that the branching condition in step S4002 has been changed to a condition in which an earthquake motion warning is being issued and whether the earthquake motion warning being issued is in the corresponding region. Only when a seismic motion warning is being received, the above-described confirmation screen is displayed to the user, and the user can select whether to give priority to seismic motion warning information or channel switching, thereby improving convenience.

  Embodiment 8 according to the present invention will be described with reference to FIGS. 43, 44, 45, 46, 47, 48, 49 and 50.

  FIG. 43 shows the processing of the control unit 118 that is activated when the channel selection state changes, such as when the digital broadcast receiving device transitions to a standby state, or when the display is not digital broadcast and the output is switched from an external input terminal. It is a flowchart which shows the seismic-motion warning information back reception setting process 5000. FIG.

  First, the seismic motion warning information back reception setting process 5000 confirms the channel selection state of the digital broadcast receiving apparatus. (Step S5001) If the channel is currently selected for digital broadcasting, that is, a state in which a broadcast video or data broadcast is being displayed, or tuning such as firmware update processing or processing for obtaining data such as program information is required. In the state where the background processing is being executed, since the channel selection cannot be performed in order to receive the seismic motion warning information, the processing ends. Then, this process is started again when the process being executed ends or the channel selection channel changes. Conversely, if the channel is not currently selected, that is, the digital broadcast receiver device shifts to the standby state or switches to the output from the external input terminal, and acquires data such as firmware update processing and program information In the case where the background processing that requires tuning such as processing is not being executed, there is a high possibility that tuning for receiving the seismic motion warning information can be performed on the back side, and the process proceeds to the next processing (step S5002).

  Next, a process of extracting a channel that is a channel selection destination candidate of the back reception channel is performed. (Step S5002) The digital broadcast receiver apparatus performs an initial scan before viewing the digital broadcast, and creates and holds a receivable channel number list, which is a list of receivable channels as shown in FIG. Further, the digital broadcast receiver apparatus according to the present embodiment holds a back reception channel priority list as shown in FIG. Therefore, in the back reception channel candidate extraction process in step S5002, the physical channel number included in the back reception channel priority list in FIG. 45 from the receivable channel number list in FIG. A large physical channel number is extracted and rearranged in descending order with the corresponding priority, and a back reception channel candidate list as shown in FIG. 46 is created.

  Next, it is determined whether there is a back reception channel candidate in the back reception channel candidate list extracted and created in step S5002. (Step S5003) If there is a back reception channel candidate, a channel selection operation is performed on the physical channel number of the first record in the back reception channel candidate list, and this processing is completed. If there is no back receiving channel candidate, this processing is finished without performing the receiving operation of the earthquake alarm information.

  With the above-described seismic motion warning information back reception setting processing 5000, the digital broadcast receiving device shifts to the standby state, or the digital broadcast receiving device performs channel selection operation such as the display being switched to the output from the external input terminal instead of the digital broadcast. Otherwise, the channel selection destination channel is determined based on the back reception channel priority list held by the digital broadcast receiver, and the AC signal is monitored to prepare for the reception of earthquake motion warning information.

  The back reception channel priority list held by the digital broadcast receiving apparatus may be stored in advance by the digital broadcast receiver apparatus, or the back reception channel priority list may be set or changed by the user. Further, in the initial setting of the digital broadcast receiving apparatus, it may be dynamically generated using the result when the reception channel is scanned.

When dynamically generating the back reception channel priority list using the result when the reception channel is scanned, for example, when scanning the reception channel, the value of the configuration identification of the AC signal of the scan target channel (3-bit value indicated by B _{1 to} B ₃ in FIG. 5) is investigated, and when it is “001” or “110” indicating that the seismic motion warning information is transmitted, the priority is “1”. When the configuration identification value is neither “001” nor “110”, the priority is set to “−1” and the back reception channel priority list is generated. For example, when the value shown in FIG. 47 can be acquired as the configuration identification value of each channel, if the physical channel is “27”, the configuration identification values “001” and “110” are alternately received repeatedly. Therefore, it is determined that the channel transmits seismic motion warning information, and the priority is set to “1”. If the physical channel is “24”, since the configuration identification value is received as “000”, it is determined that the channel does not transmit earthquake motion warning information, and the priority is set to “−1”. Such processing is performed when the reception channel is scanned, and a back reception channel priority list as shown in FIG. 48 is generated.

    Also, if the back reception channel priority list is dynamically generated using the results of scanning the reception channel, it is considered that a broadcast station that will provide earthquake motion warning information appears after the generation, depending on the user operation Confirm the configuration identification value in the AC signal of the channel to be selected at the time of channel selection, when switching to the standby state or switching to the output from the external input terminal to receive the broadcast back If the priority is “001” or “110” indicating transmission of earthquake motion warning information, the priority is “1”, and the configuration identification value is neither “001” nor “110” Alternatively, the priority may be set to “−1” and the priority of the corresponding channel in the back reception channel priority list may be updated.

    Further, when the back reception channel priority list is generated using the result when the reception channel is scanned, the reception level of each channel (the reception level is 0 or more and the reception environment is good if the reception level is large). Conversely, the value indicating that the reception environment is poor if the reception level is low) is taken into account, the configuration identification value (3-bit binary number) of the AC signal of the channel to be scanned is investigated, and the earthquake motion warning information is transmitted. If the value is “001” or “110” indicating that the value is the same as the value of the reception level, the priority is set. If the configuration identification value is neither “001” nor “110” Alternatively, a method of generating a back reception channel priority list obtained by setting a value obtained by multiplying the value of the reception level by -1 as the priority may be used. For example, when the configuration identification value and the reception level value of each channel are as shown in FIG. 49, if the physical channel is “27”, the configuration identification values are “001” and “110”. Since the signals are alternately and repeatedly received, it is determined that the channel transmits the seismic motion warning information. Further, since the reception level of the physical channel “27” is “63”, the priority is set to “63”. If the physical channel is “24”, since the configuration identification value is received as “000”, it is determined that the earthquake motion warning information is not transmitted, and the reception level of the physical channel “27” is “61”. Therefore, the priority is set to “−61”. Such processing is performed when the reception channel is scanned, and a back reception channel priority list as shown in FIG. 50 is generated.

    Also, if the back reception channel priority list is dynamically generated using the results of scanning the reception channel, it is considered that a broadcast station that will provide earthquake motion warning information appears after the generation, depending on the user operation Check the configuration identification value in the AC signal and the reception level of the channel at the time of channel selection, when switching to standby mode, switching to output from the external input terminal, etc. If the configuration identification value is “001” or “110” indicating that the seismic motion warning information is transmitted, the reception identification value is either “001” or “110”. If not, the priority of the corresponding channel in the back reception channel priority list may be updated to a value obtained by multiplying the reception level value by -1. There.

  According to the present embodiment, even if the channel for transmitting earthquake motion warning information is not being watched, the digital broadcast receiver device has shifted to the standby state and has not performed background processing that requires digital broadcast channel selection. If it is switched to a state or display of external input and does not require digital broadcast tuning, it is possible to automatically switch to a channel for transmitting earthquake motion warning information and receive earthquake motion warning information correctly.

  A ninth embodiment according to the present invention will be described with reference to FIGS. 51, 52, 53, 54, and 55. FIG.

  FIG. 51 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 digital television broadcasting.

  123 is a channel selection unit, 124 is an orthogonal demodulation unit, 125 is an FFT unit, 129 is a demodulation / decoding unit that performs demodulation and decoding operations of the digital broadcasting system from the FFT unit 125 to TS output, 130 is a descrambling unit, and 131 is a demax. Reference numeral 132 denotes a decoding unit for the compressed broadcast video signal and the compressed broadcast audio signal. Reference numeral 126 denotes a synchronous reproduction unit, 127 denotes a frame extraction unit, and 128 denotes a TMCC decoding unit, which performs synchronous signal reproduction for performing the operation of the demodulation decoding unit 129 and obtains information such as transmission parameters.

  The difference between FIG. 26 and FIG. 51 is that, from the channel selection unit 102 to the decoding unit 108, and the block from the synchronous reproduction unit 111 to the TMCC decoding 113, the reproduction of the broadcast video signal, the broadcast audio signal, and the AC signal of only one channel. Rather than receiving seismic motion warning information, add blocks from the channel selection unit 123 to the decoding unit 132 to reproduce broadcast video signals and broadcast audio signals of other channels, and receive seismic motion warning information from AC signals. It is a point that is added so that it can be done. Therefore, the video synthesizing unit 2601 can receive not only the video signal from the decoding unit 108 but also the video signal from the decoding unit 132 so that the two broadcast video signals can be synthesized and passed to the video display unit 109. I have to. In addition, the audio synthesis unit 2602 can receive not only the audio signal from the decoding unit 108 but also the audio signal from the decoding unit 132 so that the two broadcast audio signals can be synthesized and passed to the audio output unit 110. I have to. Also, the earthquake motion warning information receiving unit 120 does not only receive the segment No. 0 AC signal from the FFT unit 104 as an input to the AC decoding unit 116, but also AC-decodes the segment No. 0 AC signal from the FFT unit 125. Part 116 is changed so that it can be received as an input. Then, in the AC decoding unit 116, when the configuration identification of the AC signal of each of the FFT unit 104 and the FFT unit 125 indicates transmission of earthquake motion warning information (in the case of “001” and “110”), the respective earthquake motion warnings Information is extracted and passed to the determination unit 117.

FIG. 52 is a block diagram showing an embodiment of the discriminating unit 117, which is a main block of the present embodiment. Reference numeral 2513 denotes data input from the AC decoding unit 116, 2514 denotes an error correction detection unit, and 2515 denotes a data judgment storage unit. is there.

  The difference between FIG. 25 and FIG. 52 is that each earthquake motion warning information extracted from the AC signal of segment No. 0 of each of the FFT unit 104 and the FFT unit 125 is subjected to error correction by the error correction detection units 2502 and 2514, and data judgment is performed. The storage units 2506 and 25 store the corresponding area flag, time information, prefectural information, and epicenter information necessary for displaying the seismic motion warning information, among the received seismic motion warning information, and determine the seismic motion warning information display. This is a point of passing as an input of the comparison determination unit 2507 to be performed.

  The comparison determination process 6000, which is a process for determining whether the comparison determination unit 2507 notifies the earthquake motion warning information and which earthquake motion warning information is notified, will be described below with reference to FIG.

  First, the comparison determination process 6000 repeatedly executes steps S6002 and S6003 for each earthquake motion warning information received and stored in the data determination storage units 2506 and 2515. (S6001) The absolute value of the difference between the time information of each earthquake motion warning information and the current time acquired from the current time setting unit 2505 is calculated. If the value is smaller than a preset threshold value, “normal” is obtained. Judge as earthquake motion warning information. If the threshold value is exceeded, it is judged as “abnormal” earthquake motion warning information. (S6002) Next, the corresponding region presence flag of each earthquake motion warning information is compared, and if the corresponding region is present (when the signal identification is “000” or “010”), it is determined that the earthquake motion warning information is present. If there is no corresponding area (when the signal identification is “001” or “011”), it is determined that the earthquake motion warning information does not exist. (S6003) The above processing is repeated for the stored earthquake motion warning information.

  And the judgment result of all the above earthquake motion warning information is compared. (S6004) If there are two or more earthquake motion warning information “normal” and “there is a corresponding area”, execute the earthquake motion warning information selection processing 7000 for selecting which earthquake motion warning information to display. As a result, the selected seismic motion warning information is set as “existing” seismic motion warning information, and the flow advances to step S6006. If there is only one earthquake motion warning information “normal” and “there is a corresponding area”, the corresponding earthquake motion warning information is set as “corresponding” earthquake motion warning information, and the process proceeds to step S6006. If all earthquake motion warning information is “abnormal” or “no applicable area”, the process proceeds to step S6007.

  In step S6006, in order to display the earthquake motion warning information “applicable”, the information is output to the buzzer unit 2508 and the processing unit 2509, and the processing is ended. In step S6007, the buzzer unit 2508 and the processing unit 2509 are notified so as not to display the seismic motion warning information, and the process ends.

  By the above comparative judgment processing 6000, it is possible to display appropriate earthquake motion warning information from a plurality of earthquake motion warning information received from a plurality of AC signals, and to stop the display if there is no appropriate earthquake motion warning information. is there.

  Next, the earthquake motion warning information selection processing 7000 will be described with reference to FIG.

  First, FIG. 54 is a flowchart for explaining a seismic motion warning information selection process 7000 for selecting appropriate seismic motion warning information based on the time information in the seismic motion warning information.

First, in the earthquake motion warning information selection processing 7000, the “maximum value” which is a temporarily used variable is set to 0, and “selection” indicating the selected earthquake motion warning information is performed (for example, seismic motion warning information is managed in an array). If it is, an invalid index value is set to -1, and if it is managed in the list structure, it is set to a NULL value indicating an invalid pointer. (S7001) Then, in S6004, for the seismic motion warning information whose seismic motion warning information is “normal” and “there is a corresponding area”, the following processing is executed until there is no corresponding information, and the processing ends. (S7002)
First, the time information included in the earthquake motion warning information is compared with the currently stored “maximum value”. (S7003) If the result of comparison is greater than “maximum value”, the process proceeds to the next processing step S7004. If the value is equal to or less than the value of “maximum value”, the process proceeds to the corresponding earthquake motion warning information, and the time information is compared again. The process proceeds to S7003.

If it is larger than the “maximum value”, the “maximum value” is updated to the time information of the currently compared earthquake motion warning information, the current temporary earthquake motion warning information is set to “selected”, and the corresponding Proceed with the earthquake motion warning information. (S7004)
With the above-described seismic motion warning information selection process 7000, the latest seismic motion warning information can be selected from a plurality of corresponding seismic motion warning information.

  In addition, as shown in FIG. 46, it is set using a reverse reception channel candidate list in which priority is set for an identifier (for example, physical channel number) uniquely assigned to each terrestrial digital broadcast channel. Earthquake motion warning information selection processing 7000 for selecting optimal earthquake motion warning information based on priority may be used.

  FIG. 55 is a flowchart of such an earthquake motion warning information selection process 7000a.

  The difference between FIG. 54 and FIG. 55 is the following three points. The first point is that the maximum value set in step S7001 is changed to -1 instead of 0. Next, in step S7003, which compares the time information of the earthquake motion warning information, the physical channel number for identifying the channel currently being received is acquired from the control unit 118, and the information is used as a search key. If the priority level is greater than the “maximum value”, the process proceeds to step S7004a. If it is smaller than the “maximum value”, the process proceeds to the next corresponding earthquake motion warning information (S7003a). This is the point. If the corresponding priority is not found from the back reception channel priority list, the acquired priority is set to 0 and processing is performed. The last third is to set the “maximum value” and “selection” setting processing in S7004 to “maximum value” with the priority obtained from the back reception channel priority list as shown in FIG. This is a change to the processing (S7004a).

  As a result, the seismic motion warning information selection processing 7000a can select the optimal seismic motion warning information for display according to the priority set for each channel, so that the priority of the channel of the broadcasting station closer to the region is set to the highest value. By doing so, it is possible to preferentially display earthquake motion warning information suitable for the viewing area. In the case of a special area that can be received by a distant broadcasting station, if you want to watch a program but want to stop unnecessary earthquake motion warning information, in the case of this example, the priority is a negative value. By setting it to (value less than 0), it is possible to control that the seismic motion warning information of that channel is not displayed, so there is also an advantage that it is possible to provide a digital broadcast receiver that can display seismic motion warning information that is more suitable for the region. .

  The back reception channel priority list in FIG. 46 may be information set in advance in the digital broadcast receiver, or the priority may be changed by the user setting from the setting screen. Further, in the initial setting of the digital broadcast receiving apparatus, the processing for generating the priority from the configuration identification value in the AC signal and the reception level as described in the eighth embodiment using the result when the reception channel is scanned. May be used for the seismic motion warning information selection processing 7000a, as shown in FIG. 48 or FIG.

  In the present embodiment, by selecting a plurality of channels at the same time, it is possible to acquire the seismic motion warning information from the AC signals of the plurality of channels and increase the possibility that the seismic motion warning information can be acquired. Also, when multiple earthquake motion warning information can be acquired from multiple channels of AC signals, more appropriate earthquake motion warning information can be acquired by selecting the earthquake motion warning information from the time information and priority of the earthquake motion warning information. effective.

  Embodiment 10 according to the present invention will be described with reference to FIG.

  FIG. 56 is a diagram illustrating a display example of the error screen displayed in the error screen display process S4005 according to the sixth embodiment.

  The error screen as shown in FIG. 56 displays an error screen at the bottom of the screen so as not to obstruct the information on the emergency earthquake motion warning when the information on the earthquake motion warning is already displayed at the center of the screen. And In addition, for example, when emergency earthquake motion warning information is displayed at the top of the screen, the error screen is displayed at the bottom of the screen, and when emergency earthquake motion warning information is displayed at the bottom of the screen, an error is displayed. The screen is displayed at the top of the screen while adjusting the display position so that it does not overlap.

  In this embodiment, when the information on the emergency earthquake motion warning is displayed on the screen, even if the user displays an error screen when trying to operate the channel, the information on the already displayed emergency earthquake motion warning is not hidden. Therefore, there is an effect that emergency earthquake motion warning information important for the user can always be confirmed.

  Embodiment 11 according to the present invention will be described with reference to FIG.

  FIG. 57 is a diagram illustrating a display example of the confirmation screen displayed in the confirmation screen display processing S4006 according to the seventh embodiment.

  The confirmation screen as shown in FIG. 57 displays a confirmation screen at the bottom of the screen so as not to block the information on the emergency earthquake motion warning when the information on the emergency earthquake motion warning is already displayed at the center of the screen. And In addition, for example, when emergency earthquake motion warning information is displayed at the top of the screen, the confirmation screen is displayed at the bottom of the screen, and when emergency earthquake motion warning information is displayed at the bottom of the screen, confirmation The screen is displayed at the top of the screen while adjusting the display position so that it does not overlap.

  In this example, when the information of emergency earthquake motion warning is displayed on the screen, even if the confirmation screen confirming whether the user wants to perform channel operation and execute the channel change is displayed, the already displayed emergency earthquake motion is displayed. Since the alarm information is not concealed, there is an effect that the information on the emergency earthquake alarm that is important for the user can always be confirmed.

101 ... Antennas 102, 123 ... Channel selection units 103, 124 ... Orthogonal demodulation units 104, 125 ... Fast Fourier transform (FFT) units 105, 129 ... Demodulation decoding units 106, 130 ... Descramble units 107, 131 ... Demax units 108, 132 ... decoding unit 109 ... video output unit 110 ... audio output unit 111, 126 ... synchronous playback unit 112, 127 ... frame extraction unit 113, 128 ... TMCC decoding unit 114,115 ... switching unit 116 ... AC decoding unit 117 ... determination unit 118 ... Control unit 119 ... Broadcast receiving unit 120 ... Earthquake alarm information receiving unit 121 ... Digital broadcast receiving device 122 ... User operation input unit 201 ... Information source encoding unit 202 ... MPEG2 multiplexing unit 203 ... TS remultiplexing unit 204 ... RS ( Reed-Solomon) encoding unit 205 ... hierarchy dividing unit 206a, b, c ... parallel processing unit 207 ... hierarchy Combining unit 208 ... Time interleaving unit 209 ... Frequency interleaving unit 210 ... OFDM frame configuration unit 211 ... Inverse fast 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, 2513 ... Input 2502, 2514 ... Error correction detection unit 2504 ... Clock unit 2505 ... Current time setting unit 2506, 2515 ... Data judgment storage unit 2507 ... Comparison judgment unit 2508 ... Buzzer sound Generating 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 707 ... Moving picture still image switching plane display memory 2708 ... Text and figure plane display memory 2709 ... Subtitle plane display memory 2710 for displaying subtitles ... Switching units 2711, 2712, 2714, 2715 ... Adjustment units 2713, 2716 ... Addition unit 2717 ... Data input 2718, 2719 ... adjustment unit 2720 ... addition unit 2721, 2725 ... output 2722, 2723 ... adjustment unit 2724 ... addition unit 2726, 2727, 2729, 2730 ... switching unit 2728, 2731 ... addition unit 4000 ... key reception processing 4100 ... Confirmation key reception processing 5000 ... Earthquake motion warning information reverse reception setting processing 6000 ... Comparison judgment processing 7000 ... Earthquake motion warning information selection processing

Claims (2)

A digital broadcast receiver that receives a transmission signal having a digital broadcast signal including a broadcast video signal or a broadcast audio signal and an AC signal for transmitting earthquake motion warning information,
A plurality of receiving units for receiving the transmission signal;
An AC signal decoding unit for decoding a plurality of AC signals from transmission signals received by the plurality of receiving units;
Input a plurality of AC signals decoded by the AC signal decoding unit, and determine whether or not the time information is normal for a plurality of earthquake motion warning information and whether there is information of the corresponding area or information without the corresponding area. A discriminator;
When the time information is normal and there are a plurality of earthquake motion warning information in the corresponding area, the determination unit selects the earthquake motion warning information based on the priority of the channel of the transmission signal received by the plurality of reception units, A digital broadcast receiver characterized in that the digital broadcast is output. A digital broadcast receiving method for receiving a transmission signal having a digital broadcast signal including a broadcast video signal or a broadcast audio signal and an AC signal for transmitting earthquake motion warning information,
A plurality of receiving steps for receiving the transmission signal;
An AC signal decoding step of decoding a plurality of AC signals from the transmission signals received in the plurality of reception steps;
Input a plurality of AC signals decoded in the AC signal decoding step, and determine whether time information is normal for a plurality of earthquake motion warning information, and whether there is information of the corresponding region or information without the corresponding region. A determination step;
In the determination step, when the time information is normal and there are a plurality of earthquake motion warning information in the corresponding area, the earthquake motion warning information is selected based on the priority of the channel of the transmission signal received by the plurality of receiving units, A digital broadcast receiving method, characterized by comprising:

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