JP2010136353A - Receiver, transmitter and transmission system of emergency alert message in terrestrial digital television broadcast - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a receiver, a transmitter and a transmission system for an emergency alert message in a terrestrial digital television broadcast. <P>SOLUTION: This receiver 1 includes: a flag for identifying the presence or absence of an emergency alert message; a transmission control signal extracting means 9 for previously defining telegraphic message information of a format including broadcast provider identifying information enabling recognizing the information of an emergency alert message for each broadcast area so as to be transmitted by a transmission control signal, receiving terrestrial digital television broadcast signals and extracting the transmission control signal; and an information analyzing means 13 for determining the broadcast provider identifying information of the telegraphic message included in the transmission control signal and analyzing the contents of the emergency alert message. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technology for transmitting and receiving emergency warnings such as emergency warning broadcasting and emergency earthquake warnings in digital terrestrial television broadcasting, in a format including broadcaster identification information that makes it possible to identify emergency warning information by broadcasting region. The present invention relates to a receiver, a transmission device, and a transmission system for transmitting electronic message information.

  Currently, for example, an ISDB-T (Integrated Services Digital Broadcasting-Terrestrial, ARIB standard STD-B31) system has been put into practical use as a transmission system for digital terrestrial television broadcasting.

  In this case, a terrestrial digital television broadcast receiver that is not turned on when a broadcast station conducts an emergency warning broadcast in response to a large-scale earthquake or tsunami warning, or a request from a local government, continues from analog broadcasting. There is a mechanism for starting.

  For example, there is a signal called TMCC (Transmission and Multiplexing Configuration Control) signal provided for transmitting information related to the demodulation operation of the receiver.

  In this TMCC signal, information called an emergency warning broadcast activation flag, which changes the bit value based on emergency warning broadcasting, is described. If this emergency warning broadcast activation flag is detected and the value is 1, emergency warning broadcast is performed, and therefore the receiver can be started up by this emergency warning broadcast activation flag.

  A technique is disclosed in which this is operated with reduced standby power consumption and a receiver whose power is not turned on is notified to the receiver (see, for example, Patent Document 1). This technology includes a transmission control signal receiving circuit for detecting an emergency warning broadcast activation flag. When the emergency warning broadcast activation flag is 1, the terrestrial digital television broadcast receiver is turned on, and the receiver This is a technology that encourages viewers to watch emergency warning broadcasts.

  On the other hand, the Japan Meteorological Agency started providing earthquake early warnings (see Non-Patent Document 1, for example) to the general public from October 1, 2007. Along with this, each broadcast station of television and radio also started broadcasting such as displaying on the television screen or transmitting it with sound together with the chime sound when the breaking news is announced. In addition, a part of the earthquake early warning radio broadcast started on April 1, 2008.

  In addition, a technique using an AC (Auxiliary Channel) carrier is disclosed in addition to transmission / reception of a start flag by a TMCC signal for transmission in terrestrial digital television broadcasting such as disaster and disaster prevention information including earthquake early warning (for example, , See Patent Document 2). The combination of the emergency warning broadcast activation flag of the TMCC carrier and the signal type bit placed on a specific AC carrier in the partial reception segment, for example, presents the type of emergency early warning and the start or end. In addition, ARIB standard STD-B10 emergency bulletin descriptors and emergency bulletin video / audio are transmitted using an AC carrier. This emergency bulletin descriptor includes the signal type bit and is stored in the AC signal of the partially received segment, and the video / audio is stored and transmitted in the AC signal of the other segment.

  Also in the technique of Patent Document 2, it is disclosed that when the power of the receiver is not turned on or when other channels are received, prompting for power-on or channel switching is performed. Techniques have been proposed for receiving TMCC signals and AC signals in a segment and reproducing other disaster / disaster prevention information and video / audio after power-on or channel switching.

JP 2006-319771 A JP 2007-243936 A

“Technical reference materials on overview and processing methods of earthquake early warnings,” Japan Meteorological Agency Earthquake Volcano, [Search on January 31, 2008], Internet <URL: http://www.seisvol.kishou.go.jp/ eq / EEW / kaisetsu / Whats_EEW / reference.pdf>

  When transmitting emergency information using terrestrial digital television broadcasting, it is necessary to shorten the time until the receiver receives the emergency information and issues an alarm. The conventional method of superimposing and transmitting emergency earthquake early warning information to video signals requires video coding, modulator / demodulator interleaving processing time, etc. It was difficult to send the earthquake early warning to the receiver. Therefore, even if you transmit emergency early warning using just TMCC or AC signal, the data transmission speed is slow, so if you try to transmit detailed earthquake information like general emergency earthquake warning, the amount of information will be long, There is a problem that the delay time becomes large. For example, the area information defined in the earthquake earthquake warning for general public is 187 area, but the amount of information that can be transmitted in one frame of AC signal of digital terrestrial broadcasting is 203 bits. One frame is occupied exclusively.

  When transmitting urgent breaking news using digital terrestrial television broadcasting, how to shorten the time until the receiver receives the urgent breaking news and issues an alarm is an important issue. The conventional method of transmitting emergency earthquake bulletin information superimposed on video signals requires video encoding, modulator and demodulator interleave processing time, etc., so it is urgent before an earthquake occurs before the shaking occurs. It was difficult to deliver the earthquake early warning to the receiver. When using TMCC signals and AC signals to avoid delays in video coding and interleaving processing time, the data transmission rate is slow, so it is necessary to transmit detailed earthquake early warnings such as emergency earthquake warnings for general public. Becomes longer, which causes a problem of delay time.

  SUMMARY OF THE INVENTION An object of the present invention is to transmit a telegram early warning information required by a receiver with a small amount of information. An object of the present invention is to provide a receiver, a transmission device, and a transmission system for transmitting information.

  A transmission apparatus that transmits terrestrial digital television broadcasts multiplexes information on a broadcast area currently being broadcast on a TMCC or AC signal and transmits the multiplexed information. Whether the area where the broadcast wave is received is included in the general earthquake early warning area when the broadcast area information is acquired by the receiver through the transmission of a limited amount of information and the earthquake early warning is issued Let them judge quickly. The emergency earthquake warning is also referred to as an earthquake motion warning.

  That is, the receiver according to the present invention is a receiver that receives a transmission control signal from a terrestrial digital television broadcast wave, and can identify a flag for identifying the presence or absence of emergency bulletin and information on emergency bulletin for each broadcasting region. A transmission control signal that is preliminarily specified so that telegram information in a format including broadcaster identification information to be transmitted is transmitted by a transmission control signal, and that receives the terrestrial digital television broadcast wave and extracts the transmission control signal It is characterized by comprising extraction means and information analysis means for discriminating the broadcaster identification information of the telegram information included in the transmission control signal and analyzing the contents of the emergency bulletin. In the receiver according to the present invention, it is preferable that the receiver includes a warning unit that issues a warning according to the information of the emergency breaking news analyzed by the information analysis unit. In the receiver according to the present invention, the information analysis means may receive an emergency bulletin corresponding to a signal type that can identify the type of emergency bulletin according to the area information specified as a result of analyzing the broadcaster identification information. It is preferable that the warning means issues a warning when it is determined whether or not an emergency early warning has been issued in the signal identification. Furthermore, it is preferable that the receiver according to the present invention further includes broadcast wave channel setting means for automatically setting the channel setting of the terrestrial digital television broadcast wave according to the broadcast provider identification information analyzed by the information analysis means. is there.

  In the receiver according to the present invention, the broadcaster identification information corresponds to a local and regional code in a telegram format for emergency earthquake warning of the Japan Meteorological Agency.

  The receiver according to the present invention is further characterized by further comprising a control means for controlling so as to issue a warning after verifying a plurality of received information and verifying the certainty of the information. The receiver according to the present invention further comprises position detection means for detecting a current position of the receiver, and the control means includes information on emergency breaking information corresponding to the broadcast area determined by the information analysis means, and the position. It is preferable to perform control so as to issue a warning after verifying the probability of the received signal by collating with the position information determined by the detection means.

  In addition, the transmission device for digital terrestrial television broadcasting according to the present invention receives the terrestrial digital television broadcast wave at the receiver side and can receive the emergency early warning in the transmission control signal. It is characterized by transmitting telegram information in a format including a flag for identification and broadcaster identification information that enables identification of emergency warning information for each broadcast area by a transmission control signal.

  The transmission system of the present invention is a transmission system for digital terrestrial television broadcasting, and includes a flag for identifying presence / absence of emergency bulletin, and broadcaster identification information for identifying emergency bulletin information for each broadcast area. Comprising: a transmission device that transmits message information in a format including a transmission control signal; and a receiver that receives a transmission control signal from a terrestrial digital television broadcast wave, wherein the receiver includes the received terrestrial digital television broadcast wave. Transmission control signal extraction means for extracting the transmission control signal from the information, and information analysis means for determining the broadcaster identification information of the telegram information included in the transmission control signal and analyzing the contents of the emergency bulletin It is characterized by.

  According to the present invention, when transmitting emergency information to a receiver of digital terrestrial television broadcasting, by transmitting broadcast emergency information included in the broadcasting area and nationwide local information by broadcaster identification information, Emergency information can be transmitted quickly.

It is a figure which shows the receiver in the transmission system of Example 1 by this invention. It is a figure showing the AC carrier used for the receiver in the transmission system of Example 1 by this invention. It is a figure showing the TMCC carrier used for the receiver in the transmission system of Example 1 by this invention. It is a figure showing the intermittent reception mode for starting flag monitoring in the receiver in the transmission system of Example 1 by this invention. It is a flowchart showing the operation | movement according to signal identification in the receiver in the transmission system of Example 1 by this invention. It is a figure showing the structural example of the outline message | telegram information in the receiver in the transmission system of Example 1 by this invention. It is a figure showing the structural example of the message | telegram information in the receiver in the transmission system of Example 1 by this invention. It is a figure which shows the example of the area | region division of the earthquake earthquake warning for general use used for the receiver in the transmission system of Example 1 by this invention. It is a figure which shows the example of the area | region division of the earthquake earthquake warning for general use used for the receiver in the transmission system of Example 1 by this invention.

  First, the receiver in the transmission system of Example 1 by this invention is demonstrated.

  The receiver 1 in the transmission system according to the first embodiment of the present invention is a terrestrial digital television broadcast service that transmits emergency early warning (hereinafter, information including emergency alert broadcast and emergency earthquake early warning is collectively referred to as emergency early warning). 1 is a device that receives an emergency bulletin transmitted by a transmission control signal (that is, a TMCC signal or an AC signal), and is a device that can promptly notify the user of the receiver 1 of information on the emergency bulletin. .

  FIG. 1 shows a receiver 1 in a transmission system according to a first embodiment of the present invention. The reception part of the transmission control signal that constitutes the receiver 1 mainly includes a transmission control signal synchronization establishment unit 2, an emergency early warning analysis unit 3, and a warning generation unit 14. Further, in order to control the power supply of the transmission control signal synchronization establishment unit 2, the emergency early warning analysis unit 3, and the warning generation unit 14, the receiver 1 includes a synchronization holding / power control unit 4, a power source 21, a power source, And switches 22, 23, and 25. The transmission control signal synchronization establishment unit 2 includes a frequency conversion unit 6, an AD conversion unit 7, an FFT 8, a transmission control signal extraction unit 9, a frame synchronization detection unit 15, and an activation flag demodulation unit 16. Further, the emergency bulletin analysis unit 3 includes an emergency information extraction determination unit 11, an error correction unit 12, and a detailed information analysis unit 13. Further, the synchronization holding / power control unit 4 includes a frame synchronization holding unit 17, a timing control unit 18, an activation flag monitoring unit 19, and a power supply control unit 20.

  The AC signal is composed of 204 symbols in one frame. For example, in the case of the mode 3 synchronous modulation unit of the partial reception segment (segment number # 0) of the ISDB-T terrestrial digital television broadcast wave, the carrier number # 7 , # 89, # 206, # 209, # 226, # 244, # 377 and # 407 are signals carried by AC carriers at eight locations (see FIG. 2). When transmitting an emergency early warning using an AC signal, since it has the same frame length as the TMCC signal, for example, the same “differential demodulation reference [1]” as the TMCC signal (shown in FIGS. 2 and 3). “Reference”) and “synchronization signal [16]” are provided, and further, “emergency information data [105]” and “reservation bit [82]” are provided as an example of telegram information that is transmitted from the transmission device. It is defined in advance ([] represents the number of bits). Here, the “reserved bit [82]” can be transmitted as a “parity bit” for error correction of the information of the “emergency information data [105]”. A detailed example will be described later along with an example of “emergency information data [105]”.

  The TMCC signal is composed of 204 symbols. For example, in the case of a mode 3 synchronous modulation section of a partial reception segment (segment number # 0) of an ISDB-T terrestrial digital television broadcast wave, carrier numbers # 101 and # 131 are used. , # 286 and # 349, which are known as signals provided for transmitting information related to the demodulation operation of the receiver 1, which is carried by TMCC carriers at four locations (see FIG. 3). When transmitting emergency early warning using a TMCC signal, the TMCC signal uses “Reserve [12]” in “TMCC information” defined in the ISDB-T standard for digital terrestrial television broadcasting waves. To transmit information. Here, since the number of transmission information frames that can be arbitrarily used is reduced as compared with the AC signal, for example, signal identification [3] to be described later is transmitted so that more information can be transmitted in a short time. Detailed information of detailed emergency early warning may be assigned to the AC signal.

  Therefore, for example, when a broadcaster receives an emergency earthquake bulletin from the Japan Meteorological Agency, it identifies a flag for identifying the presence of the emergency bulletin and the type of emergency bulletin by using a transmission device for ISDB-T digital terrestrial television broadcasting. Reservation of TMCC information carried by four TMCC carriers and / or eight ACs for storing telegram information (for example, information on earthquake early warning (earthquake motion warning) described later) including emergency signal information including possible signal identification It is stored in AC information carried by the carrier and transmitted to the receiver 1. It should be noted that the hardware configuration of the transmission apparatus related to the ISDB-T digital terrestrial television broadcasting is known and not shown. However, it is composed of a transmission device that transmits message information using transmission control information (TMCC or AC), a receiver 1 that receives the message information and performs a specific operation, and these transmission device and receiver 1. The transmission system exhibits a specific function as described below.

  In order to facilitate understanding of the present invention, the case where mode 3 in ISDB-T terrestrial digital television broadcasting is used will be described below, but it should be noted that the present invention can be applied to other modes. .

  With reference to FIG. 1 again, the receiver 1 in the transmission system of Example 1 by this invention is demonstrated.

  The frequency conversion unit 6 removes unnecessary frequency components from a digital terrestrial television broadcast wave input from the antenna 5 using a predetermined filter, selects a designated channel, converts the frequency into an intermediate frequency signal, and appropriately converts the frequency. Amplify and output. This channel selection can be determined in advance by the receiver 1.

  The AD conversion unit 7 converts the intermediate frequency signal output from the frequency conversion unit 6 into digital, and transmits a digital baseband signal.

  The FFT 8 performs an FFT (Fast Fourier Transform) operation on the effective symbol period of the OFDM symbol, and demodulates it into an OFDM format stream. The effective symbol period can be defined by performing symbol synchronization by guard interval correlation or the like, and performs an FFT operation at an FFT sample frequency according to a predetermined transmission mode.

  The transmission control signal extraction unit 9 extracts and demodulates a carrier (8 AC carriers or 4 TMCC carriers) of the transmission control signal from the OFDM format stream of the received signal, and performs delay detection with DBPSK from the OFDM format stream. After that, a level determination of 0 or 1 is performed to obtain a bit stream of a transmission control signal (AC signal or TMCC signal). The extracted AC carrier or TMCC carrier is supplied to the frame synchronization detection unit 15 and the activation flag demodulation unit 16, and the AC signal or TMCC signal after the synchronization is established is supplied to the emergency information extraction determination unit 11.

  In addition, when all the AC carriers and all the TMCC carriers in the OFDM frame are extracted by the transmission control signal extraction unit 9, a frame of a continuous AC signal extracted from the AC carrier is formed, and the TMCC carrier The frame of continuous TMCC signal extracted from the above can be configured to be a continuous frame configuration in which 8 frames of AC signal and 4 frames of TMCC signal are alternately combined. The AC signal frame and the 4-frame TMCC signal frame may be configured as a continuous frame of an arbitrary combination defined in advance.

  The frame synchronization detection unit 15 preliminarily adds a “synchronization signal” to the bit stream of the transmission control signal (AC signal or TMCC signal) demodulated by the transmission control signal extraction unit 9 and the transmission control signal (corresponding AC signal or TMCC signal). A coincidence detection with a determined mode 3 pattern is performed, and when they coincide, a frame synchronization signal (reset pulse) is generated at the head timing of the demodulated transmission control signal. Also, emergency warning synchronization probability information indicating whether or not there is a frame synchronization probability of the emergency warning is generated based on the frame synchronization signal.

  The error correction unit 12 performs error correction on the information of the emergency breaking information in synchronization with the frame synchronization signal generated by the frame synchronization detection unit 15 based on, for example, the code in the case of having the parity bit of the differential cyclic code system. . The error correction unit 12 can use a combination of a plurality of error corrections, and examples thereof include a parity method, a checksum method, and a cyclic redundancy check (CRC) method. The parity method referred to here is a method for detecting an error by determining whether the sum of data strings is an even number or an odd number. The checksum method is a method in which a bit-unit data string is converted into a byte-unit data string, and the lower one byte of the sum is extracted and determined. Furthermore, the cyclic redundancy check (CRC) method is a method for determining CRC parity bits obtained by a separately defined generator polynomial. The outline of each method has been described above, but the detailed description is omitted because it is known.

  The activation flag demodulator 16 extracts the activation flag signal from the bit stream of 8 AC signals (or 4 TMCC signals) extracted by the transmission control signal extraction unit 9 according to the frame timing detected by the frame synchronization detection unit 15. The value is detected and output to the activation flag monitoring unit 19.

  The frame synchronization holding unit 17, the timing control unit 18, the activation flag monitoring unit 19, and the power supply control unit 20 in the synchronization holding / power supply control unit 4 are always supplied with power from the power supply 21.

  The frame synchronization holding unit 17 generates a frame synchronization signal at the frame timing detected by the frame synchronization detection unit 15 and holds this timing. For example, the frame synchronization holding unit 17 includes a clock generator and a counter, and is controlled based on the frame synchronization signal output from the frame synchronization detection unit 15. The clock generated by the clock generator is counted by the counter, and the count value Each time becomes a predetermined value, a frame pulse is generated and the count value is reset according to a frame synchronization signal (reset pulse), and this frame pulse is supplied to the timing control unit 18. Thereby, the frame synchronization holding unit 17 can generate a self-held frame pulse.

  The timing control unit 18 is based on the frame pulse transmitted from the frame synchronization holding unit 17 and the emergency early warning synchronization establishment information transmitted from the frame synchronization detection unit 15. One of these combinations of intermittent reception modes is determined, and an on / off (0 or 1 value) control signal is transmitted at the timing of each intermittent reception mode.

  The activation flag monitoring unit 19 acquires the value of the activation flag signal output from the activation flag demodulating unit 16, samples and holds the value, and outputs the sample and hold value to the power supply control unit 20.

  The timing at which the activation flag monitoring unit 19 detects the activation flag signal when acquiring and monitoring the value of the activation flag as described above is also controlled based on the frame pulse output by the frame synchronization holding unit 17. .

  In the power supply control unit 20, the output value of the start flag monitoring unit 19 is “11” of the start flag signal (the start flag signal is described in 2 bits as will be described later with reference to FIG. 7. In the first period, the power supply of the transmission control signal synchronization establishment unit 2 is supplied only during the start flag signal period (including the period of the synchronization signal when performing the frame synchronization described above). The power switch 22 is ON / OFF controlled. On the other hand, while the activation flag monitoring unit 19 is outputting the activation flag signal “00” (see FIG. 7, the emergency early warning has been issued), the power supply control unit 20 transmits the transmission control signal. The first power switch 22 is controlled to be turned on so that the power supply to the synchronization establishing unit 2 is continuously performed, and the second power switch 23 is turned on so as to start the power supply to the emergency breaking news analyzing unit 2 To control. More specifically, the activation flag monitoring unit 19 monitors the presence / absence of the emergency warning indicated by the activation flag signal in each frame, and is not shown in a normal state (a state in which no emergency warning is issued continues). The frame counter counts the value of the frame (n ++, increments the value of the integer n by 1) and returns to n = 0 each time the number of frames Nf is reached, while the power supply control unit 20 redetects the synchronization signal. The first power switch 22 for switching the power supply to the transmission control signal synchronization establishing unit 2 is turned on / off.

  Therefore, when the power supply control unit 20 determines that the activation flag signal value “00” indicating that there is an emergency warning is changed to the normal state “11”, the power supply control unit 20 outputs from the timing control unit 18. The power supply to the transmission control signal synchronization establishment unit 2 is supplied to the first power switch 22 so that only the value of the activation flag signal can be constantly monitored by the activation flag monitoring unit 19 at the timing of the control signal with which synchronization is established. And the second power switch 23 is switched so that the power supply to the emergency warning analysis unit 3 is cut off.

The above is the intra-frame intermittent reception mode, and an example thereof will be described with reference to FIG.
FIG. 4A shows an example in which a continuous frame of TMCC signal is configured, and FIG. 4B shows an example in which a continuous frame of AC signal is configured. When the activation flag signal in the TMCC system is being monitored, the “synchronization information” and the “activation signal” in the TMCC information are at positions separated within one frame. Power is supplied to the transmission control signal synchronization establishment unit 2 intermittently so that power is supplied only when the activation flag signal is monitored (T _{2 in the} figure) and when synchronization is established (T _{0 in the} figure) while securing time (P _{1 in the} figure). Can be controlled. In addition, when the activation flag signal in the AC system is being monitored, the “synchronization information” and the “activation signal” in the AC information are adjacent to each other as shown in FIG. 4B in one frame. , the power supply control unit 20, to ensure proper rise time (shown P _1), only when the monitoring of the synchronization establishing and the start flag signals 'time and the start flag signal monitoring (not T ₂ (shown T _1)') power The power supply of the transmission control signal synchronization establishment unit 2 can be intermittently controlled so as to be supplied. Regardless of which method is used, it is possible to reliably and immediately obtain emergency bulletin information while extremely saving power consumption. It should be noted that the control of the continuous TMCC signal or AC signal monitoring frame (Nf frame) is not performed every frame, but is performed intermittently at a predetermined frame interval (so-called interframe intermittent reception mode). By using the inner intermittent reception mode and the inter-frame intermittent reception mode in combination, it is possible to save more power consumption and to obtain information on the emergency early warning reliably and immediately.

  As described above, the power supply control unit 20 controls to supply power to the emergency warning information analysis unit 3 in the intra-frame intermittent reception operation or the inter-frame intermittent reception mode so as to acquire only the information of the emergency warning. In particular, when operating with an inter-frame intermittent reception operation, it is also possible to operate so as to send the result of majority decision between a plurality of frames.

  The inter-frame intermittent reception mode is determined, for example, when emergency early warning synchronization establishment information indicating that AC signal synchronization is not established is supplied. In this case, the ON duration of the first power switch or the second power switch is at least one frame. For example, when only one frame is used as the ON duration, the power consumption of the receiver 1 can be greatly reduced as compared to the case where the ON is always set. Further, for example, when two frames are used, the receiver 1 can be configured to improve the reliability of the received signal by using even parity. Alternatively, for example, when three frames are used, the receiver 1 can be configured to improve the reliability of the received signal by making a majority decision.

  When the transmission mode of terrestrial digital television broadcasting is mode 3 and the guard interval ratio (GI ratio) is 1/8, one frame is 231.336 msec. In the inter-frame intermittent reception mode, there is no restriction on the power-on timing of the transmission control signal synchronization establishing unit 20, and for example, the on / off interval is set to a predetermined value (for example, every 10 seconds).

  The intra-frame intermittent reception mode is determined, for example, when emergency early warning synchronization establishment information indicating that AC signal synchronization is established is supplied. In this case, the ON duration time of the first power switch 22 or the second power switch 23 is set such that one frame shown in FIG. 4 is, for example, 20.4112 msec = (18/204) frame, and from the last symbol of the previous frame. The power is turned on, only the required bits are received, and the power is shut off at the time when reception of the update flag is started, for example. Alternatively, if the frame synchronization holding unit 17 is in a state in which a certain degree of accuracy can be maintained, the period for detecting the coincidence of the “synchronization signal” is extended, and the majority is set to 2.268 msec = (2/204). It is also possible to turn on the power supply for the period of “signal” only and shut off the power supply for the rest.

  Thus, standby power consumption is reduced by setting the power supply time to the transmission control signal synchronization establishment unit 2 at the time of AC signal synchronization establishment to 18 symbols (when synchronization is established) or 2 symbols (when starting flag monitoring). can do. When it is necessary to consider the rising operation of an AGC (automatic gain control) circuit (not shown in FIG. 1), the power is turned on earlier by a corresponding time.

  Further, in the operation of the FFT 8 and the activation flag demodulating unit 16, it is necessary to hold in a memory or the like for a certain symbol. For this reason, when operating in the intra-frame intermittent reception mode, which will be described later, in order to save the operation of the upstream processing unit that consumes a large amount of power, the frequency conversion unit 6 and the AD conversion unit 7 and the subsequent processing units are not connected. Thus, it is possible to suppress power consumption by shifting the timing of power-on and power-off.

  Therefore, the first power switch 22 that switches the power supply to the transmission control signal synchronization establishing unit 2 can be connected to each of a plurality of processing units (for example, two systems) and individually supplied with power. .

  For example, in the operation of FFT8, when converting the received signal on the time axis to the frequency axis, a sample for at least one symbol is temporarily held in a memory or the like, and an integration calculation is performed, which corresponds to the processing time. There is a delay. For this reason, when operating in the in-frame intermittent reception mode, the power-on, power-on is performed for the purpose of effectively reducing the power-on (on) time of the RF unit that consumes a large amount of power (that is, the receiving unit of the frequency converter 6). The interruption timing is shifted by at least one symbol from the subsequent processing unit such as FFT8.

  Further, for example, when power is supplied to the emergency warning analysis unit 3 such as when the activation flag is on (in the state where there is an emergency warning) in the intermittent reception mode as described above, the emergency information extraction determination unit 11 The error correction unit 12 and the detailed information analysis unit 13 are activated. In synchronization with the frame synchronization signal generated by the frame synchronization holding unit 17, the emergency information extraction determination unit 11 first obtains a bit stream of the transmission control signal, and if necessary, after combining the transmission control signal with diversity, The activation flag in the transmission control signal is determined, and if the activation flag indicates that there is an emergency warning, the bit stream of the received transmission control signal is sent to the error correction unit 12.

  In addition, for example, when the activation flag is on (the state where there is an emergency bulletin) and the power is supplied to the emergency bulletin analysis unit 3 in the intermittent reception mode as described above, the emergency information extraction determination unit 11, the error correction unit 12 and the detailed information analysis unit 13 are activated. In synchronization with the frame synchronization signal generated by the frame synchronization detection unit 15, the emergency information extraction determination unit 11 first obtains the bit stream of the transmission control signal, and if necessary, after combining the transmission control signal with diversity, The activation flag in the transmission control signal is determined, and if the activation flag indicates that there is an emergency warning, the bit stream of the received transmission control signal is sent to the error correction unit 12.

  As described above, the error correction unit 12 performs error correction on the received bit stream (emergency information data) of the transmission control signal based on the value of the parity bit using, for example, a differential cyclic coding method, and corrects the emergency information data. It is sent to the detailed information analysis unit 13.

  At this time, the error correction unit 12 confirms whether or not error correction of the bit stream of the transmission control signal is possible. If there is an error that the bitstream cannot be corrected, data is not sent to the detailed information analysis unit 13 and a control signal is output to the detailed information analysis unit 13 to notify that there is a reception error. The monitoring of the activation flag signal is continued with respect to the transmission control signal synchronization establishment unit 2. For this purpose, for example, the error correction unit 12 can send a control signal indicating resynchronization or re-demodulation to the frame synchronization detection unit 15 and the activation flag demodulation unit 16.

  The detailed information analysis unit 13 discriminates plural types of information of the telegram information by “signal identification”, and analyzes the contents of the emergency information data corresponding to the discriminated signal type. If the detailed information analysis unit 13 determines that there is an emergency bulletin corresponding to the signal type according to the analysis result, the detailed information analysis unit 13 sends a control signal to turn on the third power switch 25 and the warning generation unit 14 When there is no power supply, the power supply 21 is forcibly supplied from the power supply 21 to the warning generation unit 14. Note that the power supply control to the warning generation unit 14 by the detailed information analysis unit 13 may be configured in another mode, and may be realized in other arbitrary modes such as a software switch. Further functions of the detailed information analysis unit 13 will be described in detail with reference to FIG.

  The warning generation unit 14 displays characters on a display provided in the receiver 1, generates sound from a speaker provided in the receiver 1, issues a vibration warning by a vibrator provided in the receiver 1, or during normal operation Perceptually generate warnings with different actions. Alternatively, when the receiver 1 is provided in any device such as a mobile phone, a personal digital assistant (PDA), a wristwatch, a table clock, a personal computer, etc., the sound is generated from a speaker using the function of these devices. Alternatively, a vibration warning by a vibrator may be issued, or a warning may be generated perceptually by an operation different from that during normal operation.

  Next, the basic operation of the receiver 1 in the transmission system according to the present invention will be described. FIG. 5 is a flowchart for explaining the basic operation of the receiver 1 that receives the emergency early warning. The telegram for emergency bulletin according to the present invention is roughly divided into “broadcaster identification information”, “emergency earthquake bulletin area information”, and “emergency earthquake bulletin local information” (see FIG. 6). Each corresponds to “broadcaster identification information”, “in-broadcast area information”, and “local information” in the more detailed telegram example shown in FIG. 7, and details of FIG. 7 will be described later.

  As illustrated in FIG. 1, the receiver 1 extracts a transmission control signal (AC signal or TMCC signal) multiplexed with the transmission control signal (AC signal or TMCC signal) by the transmission control signal synchronization establishment unit 2. Then, frame synchronization is performed (steps S1 and S2), and “broadcaster identification information” included in the transmission control signal is extracted regardless of the presence or absence of the emergency early warning activation flag (step S3). Thus, the broadcast area of the area that the receiver 1 is currently receiving is specified from the broadcaster identification information (step S4). The broadcast area can be specified by referring to a “broadcaster identification table” for emergency bulletin held in advance in the receiver 1. As this broadcaster identification table, a table that is preset and held in the receiver 1 or that is updated by another communication means or the like can be used. In addition, when the receiver is a mobile terminal, for example, the broadcaster identification table is referred to based on the “broadcaster identification information” to acquire the broadcaster broadcast corresponding to each region. It is possible to reduce the time for detecting the channel information in the area.

  Subsequently, the detailed information analysis unit 13 holds the regional information specified as a result of analyzing the “broadcaster identification information”. If the receiver is a mobile terminal, the “broadcaster identification information” may be periodically analyzed. The receiver 1 determines that the information analyzed by the emergency information extraction / determination unit 11 is true by means of the transmission control signal synchronization establishment unit 2 through the presence of the emergency early warning activation flag, and issues an emergency early warning by signal identification. If it is determined that the information has been reported (step S5), the local information in the detailed information of the emergency early warning is extracted, and “strong” The “region where the shaking is estimated” and / or “the region where the strong shaking is estimated” are specified (steps S6 and S7).

  The identification of the area is realized by referring to an “area information table” for emergency bulletin set in the receiver 1 in advance. Further, identification of a region is realized by referring to a “regional information table” for emergency bulletin set in advance in the receiver. The “regional information table” and “regional information table” for emergency bulletin can be set in the receiver 1 in advance, or a table updated by another communication means or the like can be used. The receiver 1 that has identified a region and / or a region where a strong shake is estimated may be used in a predetermined operation, for example, when the receiver 1 is provided with a display device by a warning generation unit 14, “Regional information” and / or “Regional information” are displayed (steps S8 and S9).

  The receiver 1 may hold these “broadcaster identification table”, “region information table”, and “region information table” in a memory (not shown) as individual tables. As shown in FIG. 8 and FIG. 9, it may be held as one table. In the case of holding as one table, it is expected that the convenience for updating based on new information from, for example, the Japan Meteorological Agency will be improved.

The detailed information analysis unit 13 of the receiver 1 is preferably provided with a position detection unit (not shown) in order to grasp the area that the receiver 1 is currently receiving. The position detection unit detects position information indicating the regional position of the receiver 1. In particular, when the detailed information analysis unit 13 of the receiver 1 has a position detection unit, the region information from the AC signal received by the receiver 1 is compared with the position information detected by the position detection unit, and the received signal It is also possible to determine the certainty of the received information. For example, in the case where a position detection unit that detects the current position of the receiver 1 is provided, the receiver 1 broadcasts based on the “broadcaster identification information” described in the telegram information determined by the detailed information analysis unit 13. And the position information of the receiver 1 determined by the position detection unit, and after verifying the certainty of the received signal, the warning generation unit 14 can be instructed to issue a warning.
Preferably, the position detection unit may add a function of setting and inputting position information for permanently installing the receiver during installation in fixed reception. Alternatively, position detection by GPS (Global Positioning System) may be provided. The same applies to the case where the receiver of this embodiment is incorporated into a permanent type device (table clock or the like). For mobile or mobile reception, add position detection by GPS, or have other wireless communication functions such as wireless LAN, and use hotspot information (including manual location input if location is recognizable) The position of can also be detected. Further, when the receiver 1 of this embodiment is incorporated in a mobile phone, position information can be obtained using base station information to which the mobile phone is connected.
In addition, when incorporating the receiver of the present embodiment into a mobile terminal (such as a mobile phone), when receiving an emergency bulletin across multiple regions, the received information is collated and the accuracy of the information is verified. After verification, it is possible to add a function of controlling to issue a warning.
In the description of each embodiment of the present invention, including the first embodiment, information on the emergency bulletin is transmitted by the AC signal in the partial reception segment (segment number # 0) of the ISDB-T terrestrial digital television broadcast wave. It is going to be done. Many mobile / mobile terminals such as mobile phones receive this partial reception segment (segment number # 0) and watch programs (one-segment service). Therefore, the receiver 1 of each embodiment of the present invention provided in a mobile phone or the like can receive an AC signal for transmitting information on emergency breaking news.
On the other hand, also in the receiver 1 of each embodiment of the present invention provided in a digital TV for fixed reception that receives other segments, the emergency signal is received by receiving the AC signal in the partial reception segment. Can receive information.

The detailed information analysis unit 13 of the receiver 1 is preferably provided with a current time detection unit in order to grasp the current time that the receiver 1 is currently receiving. The current time detection unit detects current time information indicating the current time of the receiver. Preferably, the current time detection unit grasps an earthquake occurrence time in “Earthquake detailed information (seismic source information)” described in message information in a more detailed message example shown in FIG. More specifically, for example, the receiver 1 determines the earthquake occurrence time based on the “detailed earthquake information (seismic source information)” described in the telegram information determined by the detailed information analysis unit 13 and the current time detection unit. It is possible to instruct the warning generation unit 14 to issue a warning after checking the current time information of the receiver 1 and verifying the probability of the received signal.
Preferably, the current time detection unit includes time setting by input of a receiver, standard radio wave (radio clock, JJY), GPS, or TDT (Time Date Table) included in a received signal of a received digital terrestrial broadcast wave or Current time information can be detected from TOT (Time Offset Table) or the like. Alternatively, the current time detection unit can detect the current time based on a signal from the base station when the receiver is provided in a mobile phone.

  As shown in FIG. 1, the receiver 1 of the present embodiment normally has the presence or absence of the activation flag determined by the activation flag monitoring unit 19 (hereinafter “present” indicates that there is an emergency flash report). In the above description, “ON” or bit value “00”) can be monitored. When it is determined that the activation flag is “present” and the emergency information extraction determination unit 11 determines that the activation flag is “present”, it is transmitted by the detailed information analysis unit 13 after the activation flag. The presence / absence of “signal type” is determined. When the “signal type” is present, the detailed information analysis unit 13 analyzes the detailed information according to the type defined by the “signal type”, and the warning generation unit 14 issues a warning on the analyzed result. For example, the warning generation unit 14 displays the detailed information on the display device included in the receiver 1.

  It should be noted that the emergency bulletin can be transmitted in a hierarchical signal format. The AC signal and TMCC signal are transmitted in units of OFDM frames (about 231 milliseconds in the case of mode 3 and guard interval 1/8). For example, “activation flag” and “signal type” having high importance are transmitted in all frames, and signals are hierarchically arranged in the order of basic information and detailed information of emergency early warning.

  FIG. 7 shows a signal format in the case of transmitting emergency earthquake warning (earthquake motion warning) information by an AC signal. The AC signal is composed of 204 symbols, and an example is shown in which “differential demodulation reference”, “synchronization signal”, and “error correction code” have the same configuration as TMCC. Similar to TMCC, “differential reference [1]” and “synchronization signal [16]” are transmitted from the beginning of the frame.

  The “differential demodulation reference” and “synchronization signal” are the same as those of the TMCC signal. In the case of ISDB-T terrestrial digital television broadcasting, TMCC is based on one symbol of the OFDM (Orthogonal Frequency Division Multiplexing) method. The 204 bits of the DBPSK signal are allocated to the same 204 symbols as the signal to form one frame.

  The “synchronization signal” is used for synchronization in the same manner as the TMCC signal, is transmitted 16 bits per frame, and the phase is inverted between the odd frame and the even frame. The value is “0011010111101110” in odd frame notation.

The “differential demodulation reference” is a value based on the same generator polynomial (x ¹¹ + x ⁹ +1) as the value W _{i of the} BPSK signal assigned to the SP (Scattered Pilot) signal of the carrier number i, similarly to the TMCC signal. However, an AC carrier is used to transmit the message information. For example, the AC carrier in the partial reception segment (segment number # 0) of the ISDB-T terrestrial digital television broadcast wave is carrier number # 7, # 89, # 206, # 209 in the case of the mode 3 synchronous modulation unit. , # 226, # 244, # 377 and # 407. _{W i} are stored as "reference for differential demodulation" description in AC information this eight of AC carrier carries are each 0,0,0,0,0,1,1 and 0. Note that a modulation method other than BPSK can be used, and a method to be used on the transmission side and the reception side is determined in advance together with the above-described difference set cyclic code method.

  The transmission apparatus transmits “start flag [2]” next to “synchronization signal”. As described above, the receiver 1 can intermittently receive and monitor only the portion of the activation flag. For example, ‘00’ indicates “emergency breaking” and ‘11’ indicates “no urgent breaking”. Therefore, the activation flag functions as a flag (start / end flag) indicating the start / end of transmission of emergency early warning (for example, earthquake motion warning information). The “update flag [2]” arranged next to the “activation flag” is used for updating the information contents.

  The transmission apparatus transmits “signal identification [3]” next to “update flag [2]”. In this example, “signal identification” defined as follows is transmitted.

“000”: Earthquake early warning (applicable area)
“001”: Earthquake Early Warning (No applicable area)
“010”: Test signal for emergency earthquake warning (with corresponding area) “011”: Test signal for earthquake early warning (without corresponding area) “100”: Emergency warning broadcast “101”: First push type service activation signal “110” ": Second push type service activation signal" 111 ": No emergency warning

  The detailed information analysis unit 13 of the receiver 1 executes an operation defined for each “signal identification” in accordance with the signal identification determined by the detailed information analysis unit 13. Schematically, when the detailed information analysis unit 13 identifies 000 to 110 of “signal identification”, “emergency earthquake warning (with earthquake motion warning information)”, “emergency warning broadcast”, “push-type content distribution” ". When 111 of “Signal Identification” is identified, it can be understood that the above-mentioned activation flag detection is a malfunction, and the operation shifts to the operation of resuming the activation flag without analyzing the detailed information. Can be prevented. Note that the difference in presence / absence of the corresponding area in the emergency bulletin is that if the broadcast area currently being received includes an area where strong shaking is estimated, the predetermined operation is executed without waiting for the analysis of detailed information thereafter. It is to do. Moreover, the test signal of the earthquake early warning is for informing the receiver that it is a trial transmission. Furthermore, the two push-type service activation signals are prepared because it is assumed that different content distributions are identified and transmitted simultaneously to provide an arbitrary content service.

  The detailed information analysis unit 13 controls the receiver 1 to receive the corresponding broadcast signal when it is identified as “emergency warning broadcast”, and responds when identified as “push-type content distribution”. The receiver 1 is controlled to receive the content to be received. Therefore, in the case of “emergency warning broadcasting” or “push-type content distribution”, the detailed information in the telegram information can be used in an arbitrary manner, so that it can be used as a stuffing bit. The following description regarding FIG. 7 is a case where the detailed information analysis unit 13 identifies “emergency earthquake warning (with earthquake motion warning information)” and analyzes the detailed information.

  The detailed information analysis unit 13 can analyze “broadcaster identification [11]” transmitted next and specify the transmission source (broadcaster) of the broadcast signal. This is composed of “broadcast area identification”, “prefectural double flag”, and “area broadcaster identification”, and specifies the transmission source (broadcast broadcaster) of the currently received broadcast signal.

  “Broadcaster identification [11]” is “region identification [6]”, “prefectural multiple flag [1]”, “non-patent literature (ARIB TR-B14 terrestrial digital broadcast operation regulations)” By using “Regional Carrier Identification [4]”, it is possible to specify the broadcasting area and broadcasting company in the whole country. The identification of the broadcaster not only enables identification of the broadcast area, but also allows additional functions to be added to the receiver 1. For example, if the receiver 1 receives an AC signal regardless of when the earthquake early warning is received, or when the AC signal is received in a normal time without the earthquake early warning, the ground information is analyzed according to the information on the broadcast area analyzed by the detailed information analysis unit 13. A function for automatically setting the channel setting of the digital television broadcast wave can be provided. Thus, when a new broadcast wave scan is required, such as when the receiver 1 has moved its position, the broadcast wave channel is faster than the receiver 1 receiving the broadcast TS and performing network identification. It becomes possible to confirm the correspondence between the information and the broadcaster identification and the broadcasting area.

  The detailed information analysis unit 13 analyzes the “earthquake information [88]” transmitted next. The “earthquake information [88]” includes “earthquake basic information [22]” and “earthquake detailed information [66]”.

  “Earthquake basic information [22]” includes “total number of earthquake information being issued”, “earthquake information No.”, “earthquake ID”, “emergency earthquake early warning information number”, and “message type code”.

  The “total number of earthquake information being issued” represents the total number of earthquake information that is simultaneously issued when, for example, message information is transmitted by region in a hierarchical structure.

  “Earthquake information No.” represents what number of earthquake information the current frame indicates.

  “Earthquake ID” transmits the lower 4 bits of the general earthquake early warning issued by the Japan Meteorological Agency.

  The “message type code” is represented by “0” in the case of general earthquake early warning, and is represented by “1” in the case of information cancellation.

  “Earthquake detailed information [66]” is composed of two frames of an odd frame and an even frame. In the odd frame, “region information [59] where strong shaking is estimated” is transmitted. "Is transmitted.

  Regarding “region information [59] in which strong shaking is estimated”, “page number [1]” includes “1” in the case of an odd frame that transmits, for example, “region information in which strong shaking is estimated”. In the case of an even frame that transmits “seismic source information [59]”, it is represented by “0”.

  If the “broadcast area in-area information [40]” includes an area where strong shaking is expected in the broadcast area specified by “broadcaster identification”, the information is transmitted. For example, FIG. 8 and FIG. 9 show examples of areas of public emergency earthquake warnings included in the broadcast area specified by “broadcaster identification [11]”. As shown in FIG. 8 and FIG. 9, the area information is the most included in the broadcasting area of the “Hokkaido area” wide-area broadcasting, and the number of areas is 38. In this example, a 2-bit reserve is added and 40 bits are used for “area information in the broadcast area”.

In “Regional Information [16]”, information on “Region where strong shaking is estimated” of the earthquake early warning for general public is transmitted. 8 and 9 show the regional divisions for general earthquake early warnings. As shown in FIGS. 8 and 9, the number of regions in the region information is 14. In this example, 2 bits of spare are added and 16 bits are used for “regional information”.
In “Signal Identification”, “000” is defined as “Earthquake Early Warning (with applicable area)” and “001” is defined as “Emergency Earthquake Early Warning (without applicable area)”. The “regional information in the broadcasting area” is treated as having been transmitted according to the distinction of “no applicable area”, and the region classification of each prefecture in the “emergency earthquake early warning for general use” shown in FIGS. ] ".

  The “seismic source information [59]” includes the following detailed information.

  For example, in the case of an odd frame for transmitting “information of an area where strong shaking is estimated”, “1” is transmitted and “seismic source information” is transmitted by “page number [1]”. In the case of an even frame, “0” is transmitted.

  The transmission device transmits the hour [5], minute [6], and second [6] portions of the earthquake occurrence time of the general emergency earthquake early warning at “earthquake occurrence time [17]”.

  The transmission device transmits the “seismic latitude information” of the earthquake early warning for the general public at “seismic latitude [10]”.

  The transmission device transmits the “seismic longitude information” of the earthquake early warning for the general public using “seismic longitude [11]”.

  The transmission device transmits “the depth of the epicenter” of the earthquake early warning for general public at “the depth of the seismic source [10]”.

  The transmission device transmits “magnitude” of an emergency earthquake warning for general public (described in an emergency earthquake warning code message for advanced users) by “magnitude [7]”.

  The transmission device transmits the “maximum predicted seismic intensity” of the general emergency earthquake early warning (described in the emergency earthquake early warning code message part for advanced users) with the “maximum predicted seismic intensity [3]”. For example, an example defined as “maximum predicted seismic intensity” is as follows.

“000”: Maximum predicted seismic intensity 3
“001”: Maximum predicted seismic intensity 4
“010”: Maximum predicted seismic intensity 5- (less than 5)
“011”: Maximum predicted seismic intensity 5+ (5+)
“100”: Maximum predicted seismic intensity 6- (less than 6)
“101”: Maximum predicted seismic intensity 6+ (5+)
“110”: Maximum predicted seismic intensity 7
“111”: Non notification such as unknown prediction

  In order for the transmission side to deliver the earthquake early warning, it is necessary to transmit the minimum necessary information for the receiver accurately, quickly and reliably. For example, when a strong shake (seismic intensity of 5 or less) is estimated, it is desired to transmit information that enables the receiving side to know the size and the area name where the seismic intensity of 4 or more is estimated. Therefore, the broadcaster multiplexes and transmits the telegram information including the above-mentioned “seismic source information” using a digital terrestrial television broadcasting transmission device. For example, a broadcaster uses a digital terrestrial television broadcasting transmitter to send an “earthquake occurrence time”, an occurrence location (seismic location information: “seismic latitude”, “seismic longitude”, “seismic depth”), And the magnitude of the earthquake ("magnitude") along with an activation flag signal identifying the emergency bulletin.

  In this case, the detailed information analysis unit 13 preliminarily defines the telegram information of the earthquake early warning as shown in FIG. 7, that is, the position information (latitude, longitude, depth) of the earthquake source and the magnitude (magnitude) of the earthquake. The predicted seismic intensity and the predicted arrival time of strong ground motion (major motion) are calculated from the information on the ground amplification level that can be used. Furthermore, the detailed information analysis unit 13 can also calculate the absolute time of the predicted arrival time by adding the earthquake occurrence time.

  Specifically, the detailed information analysis unit 13 calculates the predicted seismic intensity and the predicted arrival time of strong ground motion (main motion) as follows.

The predicted seismic intensity is _calculated as a measured seismic intensity I _INSTR by the calculation formula described in Non-Patent Document 1 below.

I _INSTR = 2.68 + 1.72 log (PGV) ± 0.21 (1)

Here, PGV is the maximum velocity [cm / s] at each point on the ground surface, and as described in Non-Patent Document 1, the reference substrate (hard substrate, S wave velocity calculated by the maximum velocity attenuation formula is used. It is a value obtained by multiplying the maximum speed PGV ₆₀₀ at 600 m / s) and the ground amplification degree ARV _i at each target point in the national land numerical information.

PGV = 1.31 PGV ₆₀₀ × ARV _i (2)

As described in Non-Patent Document 1, the maximum velocity attenuation equation is expressed by Equation (3), and information necessary for calculating PGV ₆₀₀ [cm / s] is magnitude M, depth of the hypocenter. Only D [km] and the shortest fault distance x [km].

log (PGV ₆₀₀ ) = 0.58 (M−0.171) +0.0038 D−1.29
−log (x + 0.028 × 10 ^{0.50 (M−0.171)} ) −0.002x (3)

  Assuming that the receiver 1 has the above-described position detection unit for acquiring the position information and knows the point where the receiver 1 currently exists, x can be easily determined from the position information of the epicenter and the position information of the receiver 1. Can be calculated.

Further, since ARV _i is a value depending on the location, it can be selectively used based on the position information by being stored in the receiver 1 in advance.

Therefore, the measured seismic intensity I _INSTR can be easily calculated in the receiver 1 by acquiring the position information and magnitude of the epicenter which is unknown in the receiver 1 from the transmission side.

Since the measured seismic intensity I _INSTR is calculated as a numerical value including a decimal point, for example, as shown in Table 1, it is converted to the maximum predicted seismic intensity in the seismic intensity class.

  On the other hand, the estimated arrival time (time required for arrival) from the time of the occurrence of the earthquake at the location where the receiver is located is the travel time table provided by the Japan Meteorological Agency based on the epicenter distance Δ [km] and the depth of the epicenter D [km] (For example, JMA2001) can be used for calculation. The epicenter distance Δ is a value that can be calculated from the location information (latitude, longitude) of the epicenter and the location information of the receiver 1.

  Therefore, the estimated arrival time of the main motion can be easily calculated in the receiver 1 by transmitting the location information of the epicenter and the occurrence time of the earthquake which are unknown in the receiver 1.

Referring to FIG. 7 again, the transmission apparatus can transmit “CRC [8]”. Here, the 18th (startup flag) and 20th to 114th (other information for signal identification) multiplexing information related to the earthquake early warning information (earthquake motion warning information) are generated as a polynomial g (x) = x ^The CRC parity bit obtained by ⁸ + x ⁷ + x ⁶ + x ⁴ + x ² +1 is transmitted.

  The transmitter then transmits “error correction code [82]”. Here, an error correction code such as a difference set cyclic code is transmitted to improve the reliability of emergency early warning transmission.

  The receiver 1 monitors the activation flag in the same manner as described above, detects signal identification, and can analyze the detailed information described in FIG. 7 and issue an alarm if it is an emergency earthquake warning. When the “signal type [3]” is “100” (emergency warning broadcast activation signal), the receiver 1 performs an alarm operation and activates the receiver 1 to receive a broadcast signal.

  Further, when the “signal type [3]” identifies “101” (first push type service activation signal) or “110” (second push type service activation signal), the receiver 1 1 is activated to receive the contents of each push type service.

  As described above, when it is determined as “emergency warning broadcast” as a result of the determination of “signal type”, the information is transmitted by the alarm generation unit 14 determined separately, and the display screen of the receiver is also activated. Further, as an application different from the transmission of emergency bulletin, the receiver 1 is forcibly activated separately from the emergency bulletin by setting the identifier of “push-type content delivery” as the target of the determination and identification of “signal type” It is also possible to realize that individual services can be provided.

  As described above, according to the present invention, the transmitter can efficiently transmit the required detailed information, and the receiver can function to perform an appropriate reception operation according to the signal type. Even if the breaking news is issued and the time when the broadcasting station puts it on the radio wave and the difference between the timing of transmission and reception are taken into consideration, it is possible to quickly transmit the emergency breaking news in a short time of about 1 to 2 seconds.

  In the above description, a transmission example including information on emergency early warning performed using an AC carrier is introduced. However, it is also possible to apply only an alarm to a reserve bit of a TMCC signal.

  Although the specific coding scheme has been described as a representative example for the above-described embodiments, it will be apparent to those skilled in the art that many modifications and substitutions can be made within the spirit and scope of the present invention. For example, in the above-described embodiment, in order to facilitate understanding of the present invention, it has been described that the receiver according to the present invention can be provided in, for example, a mobile phone. In addition, the function of the receiver according to the present invention can be integrated into the decoding function. For example, when the mobile phone is in the standby mode, it can be operated in the same manner as in the above-described embodiment. Alternatively, when the mobile phone is in the normal operation mode, the flag value in the telegram information is set. Depending on the determination, the emergency early warning may be decoded without performing power supply control, the seismic intensity and arrival time prediction information for the area where the mobile phone is located may be calculated, and a warning may be issued. Accordingly, the invention should not be construed as limited by the embodiments described above, but only by the claims.

  The receiver and the transmission device according to the present invention enable quick and reliable transmission of the early earthquake early warning, so that they are useful for transmission system applications using a predetermined transmission control signal.

DESCRIPTION OF SYMBOLS 1 Receiver 2 Transmission control signal synchronization establishment part 3 Emergency early warning analysis part 4 Power supply control part 5 Antenna 6 Frequency conversion part 7 AD conversion part 8 FFT
9 Transmission control signal extraction unit 11 Emergency information extraction determination unit 12 Error correction unit 13 Detailed information analysis unit 14 Warning generation unit 15 Frame synchronization detection unit 16 Activation flag demodulation unit 17 Frame synchronization holding unit 18 Timing control unit 19 Activation flag monitoring unit 20 Power control unit 21 Power source 22 First power switch 23 Second power switch 25 Third power switch

Claims (9)

A receiver for receiving a transmission control signal from a terrestrial digital television broadcast wave,
The telegram information in a format including a flag for identifying presence / absence of emergency bulletin and broadcaster identification information enabling identification of emergency bulletin information for each broadcast area is defined in advance to be transmitted by a transmission control signal. And
A transmission control signal extracting means for receiving the terrestrial digital television broadcast wave and extracting the transmission control signal;
Information analysis means for determining the broadcaster identification information of the telegram information included in the transmission control signal and analyzing the content of the emergency bulletin,
A receiver comprising:   The receiver according to claim 1, further comprising a warning unit that issues a warning according to the information of the emergency bulletin analyzed by the information analysis unit.   The information analysis means determines whether or not there is an emergency bulletin corresponding to a signal type that can identify the type of emergency bulletin according to the regional information specified as a result of analyzing the broadcaster identification information, The receiver according to claim 2, wherein the warning means issues a warning when it is determined that an emergency warning has been issued by signal identification.   4. The broadcast wave channel setting means for automatically setting the channel setting of the terrestrial digital television broadcast wave according to the broadcast provider identification information analyzed by the information analysis means. A receiver according to claim 1.   The receiver according to any one of claims 1 to 4, wherein the broadcaster identification information corresponds to a local and regional code in a telegram format for emergency earthquake warning of the Japan Meteorological Agency.   The control unit according to any one of claims 1 to 5, further comprising a control unit configured to collate a plurality of received information and verify a certainty of the information and then issue a warning. Receiver. Comprising position detecting means for detecting the current position of the receiver;
The control unit compares the information of the emergency early warning corresponding to the broadcast area determined by the information analysis unit and the position information determined by the position detection unit, and verifies the probability of the received signal, The receiver according to claim 6, wherein the receiver is controlled to emit In order to receive the urgent breaking news in the transmission control signal by receiving the digital terrestrial television broadcast wave at the receiver side,
Transmitting apparatus characterized by transmitting telegram information in a format including a flag for identifying presence / absence of emergency bulletin and broadcaster identification information enabling identification of emergency bulletin information for each broadcast area using a transmission control signal . A transmission system for terrestrial digital television broadcasting,
A transmission device that transmits, in a transmission control signal, a telegram information in a format that includes a flag that identifies whether or not there is an emergency bulletin, and broadcaster identification information that enables identification of emergency broadcast information for each broadcast area,
A receiver for receiving a transmission control signal from a terrestrial digital television broadcast wave,
The receiver
Transmission control signal extraction means for extracting the transmission control signal from the received digital terrestrial television broadcast wave;
Information analysis means for determining the broadcaster identification information of the telegram information included in the transmission control signal and analyzing the content of the emergency bulletin,
A transmission system for digital terrestrial television broadcasting, comprising:

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