JP4555393B2 - Emergency early warning receiver for digital terrestrial television broadcasting - Google Patents

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, and in particular, a receiver and a transmission device that reduce the time from receiving information to issuing an alarm, And a transmission system.

  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>

  In the case of digital terrestrial television broadcasting, especially in the case of partial reception one-segment services, the delay required for signal processing such as radio frequency (RF) signal demodulation, error correction, and codec processing for video, etc. There will be a delay of several seconds. If the receiver is not turned on, it cannot be received.

  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.

  An object of the present invention is to provide a receiver and a transmission device for shortening the time from receiving information to issuing an alarm in a system for transmitting and receiving an emergency warning such as an emergency warning broadcast and an emergency earthquake warning in digital terrestrial television broadcasting. And a transmission system.

  The transmission device for transmitting terrestrial digital television broadcasting in the transmission system according to the present invention is capable of providing emergency information such as emergency early warning activation flag and signal identification, emergency early warning such as emergency earthquake early warning information number, and so on. The page is divided into detailed information such as “region” and “seismic source information”, and identification information necessary for alarming is transmitted in a shorter cycle. The receiver in the transmission system according to the present invention performs an operation corresponding to the signal identification of the telegram information. The emergency earthquake warning is also referred to as an earthquake motion warning.

  That is, the transmission device according to the first aspect of the present invention is a transmission device that transmits emergency early warning using a transmission control signal of a digital terrestrial television broadcast wave, and includes a flag for identifying presence or absence of emergency early warning, Message information setting means for setting message information for storing emergency warning information including signal identification capable of identifying the type of emergency warning signal after, and a message for transmitting the message information by a transmission control signal of digital terrestrial television broadcast waves And an information transmission means.

  The receiver according to the first aspect of 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 the type of emergency bulletin Transmission information for storing emergency early warning information including signal identification is defined in advance so as to be transmitted by a transmission control signal, and receiving the terrestrial digital television broadcast wave and extracting the transmission control signal A signal extraction unit; a signal identification extraction determination unit that determines a plurality of types of signal identification information of the telegram information included in the transmission control signal; and an information analysis unit that analyzes contents of the determined type of emergency bulletin. It is characterized by that.

  Furthermore, the transmission device according to the second aspect of the present invention is a transmission device that transmits emergency early warning using a transmission control signal of a digital terrestrial television broadcast wave, and includes a flag for identifying presence or absence of emergency early warning, Message information setting means for setting message information for storing emergency warning information including signal identification capable of identifying the type of emergency warning signal after, and a message for transmitting the message information by a transmission control signal of digital terrestrial television broadcast waves Information transmission means, wherein the message information setting means includes the emergency bulletin in the information of the emergency bulletin identified by the signal identification in order to verify whether it is legitimate message information on the receiving side. It is characterized by transmitting information including information on the current time at the time of transmission.

  The receiver according to the second aspect of 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 of an emergency bulletin and the type of the emergency bulletin. Emergency information including information on the current time at the time of transmitting the emergency early warning in the information of the emergency early warning identified by the signal identification for verifying whether it is correct signal identification and regular telegram information The telegram information for storing the bulletin is prescribed in advance to be transmitted by the transmission control signal, the transmission control signal extracting means for receiving the terrestrial digital television broadcast wave and extracting the transmission control signal, and the transmission A signal identification extraction / determination means for discriminating a plurality of types of information for signal identification of the telegram information included in the control signal; and an information analysis means for analyzing the contents of the discriminated type of emergency early warning. Is the current time information in the telegram information, if it meets by matching the information of the current time of the receiver side, characterized in that it analyzes the contents of emergency bulletin of the type described above determination.

  Furthermore, a transmission device according to a third aspect of the present invention is a transmission device that transmits emergency early warning using a transmission control signal of a digital terrestrial television broadcast wave, and includes a flag for identifying presence or absence of emergency early warning, Message information setting means for setting message information for storing emergency warning information including signal identification capable of identifying the type of emergency warning signal after, and a message for transmitting the message information by a transmission control signal of digital terrestrial television broadcast waves The message information setting means includes a hierarchy of emergency bulletins transmitted by the signal identification, and a page type as an identifier for transmitting the hierarchical emergency bulletins further hierarchically. It is characterized in that the information is transmitted.

  The receiver according to the third aspect of 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 of an emergency bulletin and the type of the emergency bulletin. Urgent signal information, and emergency warning information transmitted by the signal identification is layered and transmitted, and emergency bulletin information including a page type information as an identifier for further layering and transmitting the layered emergency bulletin is stored The message information to be transmitted is preliminarily defined to be transmitted by a transmission control signal, transmission control signal extraction means for receiving the terrestrial digital television broadcast wave and extracting the transmission control signal, and the transmission control signal A signal identification extraction judging means for discriminating a plurality of types of information for signal identification of the contained telegram information, and an information analyzing means for analyzing the content of the discriminated emergency warning The information analysis means analyzes the emergency bulletin hierarchized by the signal identification based on the information of the page type, and further analyzes the hierarchized emergency early warning information. And

  Furthermore, a transmission device according to a fourth aspect of the present invention is a transmission device that transmits emergency early warning using a transmission control signal of a digital terrestrial television broadcast wave, and includes a flag for identifying the presence or absence of emergency early warning, Followed by a telegram information setting means for setting telegram information for storing emergency early warning including signal identification that can identify the type of emergency early warning, and transmitting different earthquake information over multiple frames of transmission control signal of digital terrestrial television broadcast wave A telegram information transmission means, wherein the telegram information setting means includes an earthquake information number indicating what number of earthquake information one frame indicates when the different earthquake information is transmitted over the plurality of frames. Transmission.

  The receiver according to the fourth aspect of 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 of an emergency bulletin and the type of the emergency bulletin. When telegram information that stores emergency early warnings including signal identification is transmitted across multiple frames of transmission control signals, the earthquake information number that indicates the number of earthquake information for each frame is displayed. A transmission control signal extracting means for receiving the terrestrial digital television broadcast wave and extracting the transmission control signal, and a plurality of types of information for identifying the telegram information included in the transmission control signal. A signal identification extraction judging means for discriminating the information, and an information analyzing means for analyzing the content of the discriminating type of emergency early warning, the information analyzing means comprising information on the earthquake information number. Based on the current frame received it is characterized by analyzing whether shows what number earthquake information.

  According to the present invention, it is possible to quickly transmit emergency warning information in a short time. In particular, based on the "current time" verification result, it is possible to verify whether it is legitimate telegram information, and to transmit hierarchical information according to "signal identification" and "page type" information enable. In particular, extremely efficient information transmission is possible with a transmission control signal (TMCC signal or AC signal) having a limited number of bits.

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 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 example of a structure of the hierarchical message information 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 transmission system of Example 1 by this invention. It is a figure showing the structural example of the message | telegram information in the transmission system of Example 1 by this invention. It is a flowchart showing the operation | movement classified by signal identification 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 transmission system of Example 2 by this invention. It is a figure showing the structural example of the hierarchy type | mold message | telegram information in the transmission system of Example 2 by this invention. It is a figure which shows the receiver in the transmission system of Example 2 by this invention. It is a flowchart showing the operation | movement according to signal identification in the receiver in the transmission system of Example 2 by this invention. It is a figure which shows the example of the division of the area | region of the general emergency earthquake early warning used with the receiver in the transmission system of Example 1 and Example 2 by this invention. It is a figure which shows the example of the division of the area | region of the general emergency earthquake early warning used with the receiver in the transmission system of Example 1 and Example 2 by this invention.

  First, the transmission system according to the first embodiment of the present invention will be described.

  A receiver in a transmission system according to an embodiment of the present invention is a terrestrial digital television broadcasting service that transmits emergency early warning (hereinafter, information including emergency warning broadcast and emergency earthquake early warning is collectively referred to as emergency early warning). This 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 makes it possible to promptly notify the user of the receiver of emergency bulletin information.

  FIG. 1 shows a receiver 1 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 bulletins using TMCC signals, TMCC signals use “Reserve [12]” in “TMCC information” defined in the ISDB-T standard for terrestrial digital television broadcast 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 the emergency bulletin by using a transmission device for ISDB-T digital terrestrial television broadcasting. TMCC information reserved by four TMCC carriers and / or AC carried by eight AC carriers for storing telegram information (for example, emergency earthquake warning information described later) including emergency signal information including possible signal identification The information is stored in information 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. .

  While the output value of the activation flag monitoring unit 19 detects “1” of the activation flag signal (that is, a normal state without emergency warning), the power supply control unit 20 detects that the transmission control signal synchronization establishment unit 2 The first power switch 22 is ON / OFF controlled so that power is supplied only during the start flag signal period (including the period of the synchronization signal when the frame synchronization described above is performed). On the other hand, while the activation flag monitoring unit 19 outputs “0” of the activation flag signal (that is, the state in which the emergency early warning has been issued), the power supply control unit 20 transmits the transmission control signal synchronization establishment unit 2. The first power switch 22 is controlled to be turned on so that the power supply to the power source is continued, and the second power switch 23 is controlled to be turned on so as to start the power supply to the emergency warning analysis unit 2. 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.

  Accordingly, when the power supply control unit 20 determines that the activation flag signal value “0” indicating that there is an emergency warning is changed to the normal state “1”, the power control unit 20 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. Although the activation flag signal is described as 1 bit, it may be configured by 2 bits of “00” or “11” to provide redundancy.

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 is being monitored in the TMCC system, the “synchronization information” and the “activation flag” in the TMCC information are located within a frame, but the power supply control unit 20 The transmission control signal synchronization establishment unit 2 is intermittently powered so that time (P _{1 in the} figure) is secured and power is supplied only when the start flag is monitored (T _{2 in the} figure) and synchronization is established (T _{0 in the} figure). Can be controlled. Further, when the activation flag signal is monitored in the AC system, the “synchronization information” and the “activation flag” 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, using the AC signal format shown in FIG. 7 to be described later, the ON duration of the first power switch 22 or the second power switch 23 is, for example, 20.4112 msec = (1 frame shown in FIG. 18/204) frame, the power is turned on from the last symbol of the previous frame, and the power is cut off when the reception of a required bit, for example, a known signal is completed. 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 3.402 msec = (3/204) frames. It is also possible to turn on the power only for the last bit of the “signal”, the “activation flag signal”, and the subsequent “known signal”, and to cut off the power 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 3 symbols (when starting flag monitoring). can do. When it is necessary to consider the rising operation of an AGC (automatic gain control) circuit or the like 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, when power is supplied to the emergency early warning analysis unit 3, such as when the activation flag is on 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 is 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.

  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” (FIG. 7 described later), 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 based on the signal identification according to the analysis result, the detailed information analysis unit 13 sends a control signal for turning on the third power switch 25 and gives a warning. When the generator 14 is not supplied with power, the power supply 21 is forcibly supplied to the warning generator 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.

  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. Note that the warning generation unit 14 can display the received content distribution instead of issuing a warning when the “signal identification” indicates a content distribution service.

  Next, the basic operation of the receiver 1 according to an embodiment of the present invention will be described. FIG. 5 is a flowchart showing the basic operation of the receiver 1 that receives the emergency bulletin. In addition, emergency earthquake warnings and emergency warning broadcast emergency bulletins (which will be clarified in the following explanation, but can include information on push-type content distribution for any information service) are collectively referred to as emergency bulletins. To. It is assumed that the receiver 1 has a function of receiving and displaying content distribution.

  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 broadcast. In the above description, the bit value “0” is monitored (step S1). 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 identification” is determined (step S2). When this “signal identification” is present, the detailed information analysis unit 13 analyzes the detailed information according to the type defined by the “signal type” (steps S31 to S33), and the warning generation unit 14 gives a warning to the analyzed result. To emit. For example, the warning generation unit 14 displays the detailed information on the display device included in the receiver 1 (steps S41 to S43). Therefore, the detailed information analysis unit 13 can cause the receiver 1 to perform different operations depending on the determination result of “signal identification”. For example, when the content of “signal identification” represents the signal identification A, the detailed information analysis unit 13 responds accordingly. Detailed information analysis (step S31) and information display (step S41) are performed, and in the case of other signal types B and C determined by “signal identification”, detailed information analysis and information display are performed accordingly.

  FIG. 6 shows an example of a hierarchical signal format for transmitting emergency bulletins. 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). In the signal format shown in FIG. 6, “activation flag” and “signal identification” having high importance are transmitted in all frames. Thereafter, the signals are hierarchically arranged in the order of the basic information and the detailed information of the emergency early warning. Here, regarding the hierarchical structure of each signal, the “activation flag” is assumed to be every frame, the “signal identification” is assumed to be every frame, and the “emergency breaking news” is assumed to be continuous for every n * n frames, “Detailed information” is configured for each m × n frame. Note that m and n are natural numbers of 1 or more. The receiver 1 monitors the “activation flag” and “signal identification” sent for each frame, and executes the operation defined for each “signal identification” by the detailed information analysis unit 13. With this configuration, it is not necessary to transmit all the information related to “signal identification” using an AC signal or a TMCC signal, and only necessary detailed information can be appropriately transmitted.

  FIG. 7 shows an example of a signal format when an emergency earthquake warning is transmitted as 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 according to the present embodiment transmits “activation flag [1]” next to “synchronization signal”. As described above, the receiver 1 can intermittently receive and monitor only the portion of the activation flag. The “known signal [1]” arranged after the “activation flag” can improve the demodulation accuracy when a fixed reference signal that is defined in advance is present for performing transmission path estimation in the activation flag demodulation. However, it is not necessarily required.

  The transmitter transmits “signal identification [3]” next to “known signal [1]”. 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. It should be noted that the difference in the presence or absence of the corresponding area in the earthquake early warning is that the predetermined operation can be performed without waiting for the analysis of the detailed information after that when the area where strong shaking is estimated is included in the currently receiving broadcast area. This is to execute. Also, the test signal for the earthquake early warning is to inform the receiver 1 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 and can be used as a stuffing bit (see FIG. 8). 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 the “broadcast area identification [11]” transmitted next to specify the transmission source (broadcasting company) 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.

Note that “broadcast area identification [11]” is “area identification [6]”, “prefectural multiple flag [1]”, “area” shown in non-patent literature (ARIB TR-B14 terrestrial digital broadcast operation rules). By using the provider identification [4], it becomes 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.
Here, when only the broadcast area is specified, the transmission device does not need to transmit “prefectural double flag [1]” and “regional carrier identification [4]”.

  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” corresponds to m shown in FIG. That is, it represents the total number of earthquake information issued simultaneously.

  “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-region information [40]” includes an area where strong shaking is expected in the broadcast area specified by “broadcast area identification”, the information is transmitted. For example, FIG. 14 and FIG. 15 show an example of the region classification of the general emergency earthquake warning included in the broadcast region specified by “broadcast region identification [11]”. As shown in FIG. 14 and FIG. 15, the area information is included most 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. Table 1 shows the regional classifications for general earthquake early warnings. As shown in Table 1, 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)”. And “no corresponding area” can also determine the area to which the earthquake early warning is applicable within the range of the broadcast area in which each broadcasting station transmits the emergency early warning.

  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 transmitting device to deliver the earthquake early warning, it is necessary to transmit the minimum necessary information for the receiver 1 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”, location (seismic location information: “seismic latitude”, “seismic longitude”, “seismic depth”), And the magnitude of the earthquake ("magnitude") are transmitted together with an activation flag signal for identifying the emergency earthquake warning (set to 0 at the time of warning, otherwise set to 1).

  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)

  If the receiver 1 has a position detection unit (described later) for acquiring the position information, and the point where the receiver 1 is present is known, x is determined by the position information of the epicenter and the position information of the receiver 1. It can be easily 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 predicted arrival time (time required for arrival) from the time of the occurrence of the earthquake at the location where the receiver 1 is located is the travel time indicated by the Japan Meteorological Agency based on the epicenter distance Δ [km] and the depth D [km] of the epicenter It can be calculated using a table (for example, JMA2001). 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.

  FIG. 9 is a flowchart showing an operation according to signal identification in the receiver 1. The receiver 1 monitors the activation flag in the same manner as described above (step S11), and detects signal identification (step S12). If it is an earthquake early warning, the detailed information demonstrated in FIG. 7 will be analyzed (step S131), and a warning will be issued (step S141). When “signal identification [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 (step S142). ).

  Further, when the “signal identification [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 broadcasting” as a result of the determination of “signal identification”, the information is transmitted by the alarm generation unit 14 determined separately, and the display screen of the receiver 1 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 defining the identifier of “push-type content distribution” as the target of the determination and identification of “signal identification”. It is also possible to realize that individual services can be provided.

The detailed information analysis unit 13 of the receiver 1 is also preferably provided with a position detection unit (not shown). In particular, when the detailed information analysis unit 13 of the receiver 1 has a position detection unit that detects the current position of the receiver 1, the local information from the AC signal received by the receiver 1 and the position detection unit are detected. It is also possible to determine the likelihood of the information received by the received signal by comparing the positional information. The position detection unit detects position information indicating the regional position of the receiver 1. Suitably, a position detection part grasps | ascertains a prefectural area or a wide area by the broadcast provider identification in "broadcast area identification" described in message | telegram information. More specifically, for example, the receiver 1 determines the broadcast area based on the “broadcast area identification” described in the telegram information determined by the detailed information analysis unit 13 and the position of the receiver 1 determined by the position detection unit. It is possible to instruct the warning generation unit 14 to issue a warning after verifying the certainty of the received signal with the information.
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. Or you may provide the position detection by GPS (Global Positioning System). 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 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.

Further, it is also preferable to provide a current time detection unit (not shown) in the detailed information analysis unit 13 of the receiver 1. The current time detection unit detects current time information indicating the current time of the receiver 1. Preferably, the current time detection unit grasps the earthquake occurrence time in the “detailed earthquake information (seismic source information)” described in the message information. 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 is a time setting by input of the receiver 1, a standard radio wave (radio clock, JJY), GPS, or a TDT (Time Date Table) included in a received signal of a received digital terrestrial broadcast wave. Alternatively, 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 1 is provided in a mobile phone.

  As described above, according to the present invention, the transmission device efficiently transmits the required detailed information, and the receiver 1 can function to perform an appropriate reception operation according to the signal identification. Even when the emergency bulletin is issued and the time when the broadcast station puts it on the radio wave and the difference between the timing of transmission and reception are taken into consideration, the emergency bulletin can be transmitted promptly 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.

  Next, a transmission system according to the second embodiment of the present invention will be described. The transmission apparatus in the transmission system of the present embodiment is known as the hardware configuration of the transmission apparatus related to ISDB-T terrestrial digital television broadcasting, as is the case with the transmission apparatus in the transmission system of the first embodiment. do not do. 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.

  10 and 11 are diagrams illustrating a configuration example of message information in the transmission system according to the second embodiment of the present invention. FIG. 12 is a diagram illustrating a receiver in the transmission system according to the second embodiment of the present invention. FIG. 13 is a flowchart illustrating an operation according to signal identification in the receiver according to the second exemplary embodiment of the present invention.

  FIG. 10 is a configuration example of message information in the transmission system according to the second embodiment. “Differential demodulation reference”, “Synchronization signal”, “Start flag”, “Information content update flag”, “Signal identification”, “Seismic motion” It consists of “alarm detailed information”, “CRC”, and “error correction parity bit”. The difference from the first embodiment is that an “information content update flag” is provided immediately after the “startup flag”, and “current time”, “page type”, and “earthquake motion” are provided as “earthquake motion warning detailed information”. Information ”is arranged. The bit values assigned to each information are also different. However, the configuration of the second embodiment includes all the advantages of the configuration of the first embodiment, and only the differences will be mainly described.

  The “differential demodulation reference” and the “synchronization signal” are the same as those of the existing TMCC as in the first embodiment.

  The “activation flag” in this example is composed of 2 bits, and “00” indicates “there is an emergency warning” and “11” indicates “there is no emergency warning”. Therefore, the activation flag signal functions as a flag (start / end flag) indicating the start / end of transmission of emergency early warning (for example, earthquake motion warning information). In addition, since it is a format specialized for the transmission of earthquake motion warning information, “100” to “110” of “Signal Identification” is not operated, but it is specialized for emergency earthquake warning (or earthquake motion warning) The values “00” and “11” of the “flag” may be determined to be “with earthquake motion warning” and “without earthquake motion warning”, respectively.

  The “information content update flag” is composed of 2 bits. When the “start flag” is “00”, the information update flag is incremented by 1 each time the content of the “detailed information on earthquake motion warning” is changed. , '01', '10', '11'. If the “activation flag” is “11”, the “information content update flag” is also “11”. As a result, the receiver side can determine whether or not the information content has been changed without decoding the “detailed information on earthquake motion warning”.

  “Signal identification” makes it possible to determine the content of “detailed information on earthquake motion warning” hierarchically, as in the first embodiment. For example, as shown in FIG. 11, the information of “seismic ground motion detailed information” and the information of “broadcaster identification” can be identified hierarchically. The “broadcaster identification” is used to specify a broadcasting station that transmits the message information.

  In this embodiment, “current time information”, “page type”, and “earthquake motion information” are arranged as “earthquake motion warning detailed information”.

  As the information of “current time”, the transmission device transmits a bit value representing the time at which the message information is transmitted. As will be described later, the transmitted “current time” and the “current time” of the receiver are collated on the receiver side, so that the transmitted “earthquake information” is properly transmitted. It can be used to verify whether or not.

  The “page type” is used to identify the hierarchy of “earthquake motion information” configured in a hierarchical information form. This “page type” corresponds to the function of “page number” in the first embodiment.

  For example, as shown in FIG. 11, from the information of “page type”, “earthquake motion information # 1” including information such as “area information in broadcast area” and “regional information” exemplified in FIG. 14 and FIG. The “earthquake motion information # 2” composed of the “basic earthquake information” and the “detailed earthquake information” can be identified. The meaning of these detailed information is the same as in the first embodiment.

  Next, the receiver 1 in the transmission system according to the second embodiment will be described with reference to FIG. The receiver 1 according to the second embodiment operates by receiving the message information illustrated in FIGS. 10 and 11.

  In FIG. 12, the receiver 1 according to the second embodiment can be configured in the same manner as the receiver 1 of the first embodiment, and is given the same reference number. However, it is assumed that the transmission device according to the second embodiment transmits “current time information”, “page type”, and “earthquake motion information” as “seismic motion warning detailed information”. The detailed information analysis unit 13 of the receiver 1 includes a current time verification unit 131, a page type determination unit 132, and an earthquake information analysis unit 133.

  The operation of the receiver 1 according to the second embodiment will be described with reference to FIG. The operations in steps S21 and S22 are the same as those in steps S1 and S2 in the first embodiment, and “earthquake motion information # 1 including information on“ current time ”and“ page type ”of the signal type determined by“ signal identification ”. ”And“ earthquake motion information # 2 ”will be described.

  In step S23, the current time collating unit 131 preferably includes the above-described current time detecting unit. In the second embodiment, information on the “current time” included in the transmitted message information and the current time detecting unit are included. The “current time” information on the receiver 1 side acquired by the above is collated. When it is determined that the collation results match, it is possible to verify that the transmitted “earthquake motion information” has been properly transmitted. Note that it is not always necessary to match the “current time” information included in the transmitted message information with the “current time” information on the receiver 1 side in units of seconds. In this case, an allowable range used for comparison verification can be set in advance. If the current time information does not match, the process shifts to the operation mode for monitoring the “activation flag”.

  In step S <b> 24, when the current time collating unit 131 determines that the current time information matches, the page type determining unit 132 determines “page type” information. As a result, “when the current time information does not match”, it is not necessary to perform an extra operation such as a decryption operation of the telegram information, and an effect of preventing false alarms, spoofing, or saving power can be obtained.

  In step S25, the earthquake information analysis unit 133 performs “earthquake motion information # 1” including information such as “broadcast area area information” and “regional information”, and the above-described “earthquake basic information” and “earthquake detailed information”. And “earthquake motion information # 2”.

  In step S25, for example, the warning generation unit 14 displays “earthquake motion information” corresponding to the information of “page type”.

  As described above, in the transmission system according to the second embodiment, it is possible to verify whether or not the information is legitimate electronic message information based on the verification result of “current time”, and “signal identification” and “page type”. It is possible to transmit hierarchical information according to the information. In particular, extremely efficient information transmission is possible with a transmission control signal (TMCC signal or AC signal) having a limited number of bits.

  From the above-described embodiments, transmission systems of several modifications can be constructed.

  For example, in the transmission system according to the first aspect, a transmission device that transmits emergency early warning using a transmission control signal of a digital terrestrial television broadcast wave includes a flag for identifying presence / absence of emergency early warning, and an emergency early warning after the flag. It can be configured as a transmission device that sets telegram information that stores emergency bulletin including signal identification that can identify the type, and transmits the telegram information using a transmission control signal of a terrestrial digital television broadcast wave.

  In the transmission system according to the first aspect, a receiver that receives a transmission control signal from a digital terrestrial television broadcast wave includes a flag for identifying presence / absence of emergency bulletin and signal identification for identifying the type of emergency bulletin. When the telegram information for storing the emergency bulletin is preliminarily specified to be transmitted by the transmission control signal, the transmission control signal is extracted by receiving the terrestrial digital television broadcast wave and included in the transmission control signal. It can be configured as a receiver that discriminates a plurality of types of information for signal identification of telegram information and analyzes the contents of the discriminated types of emergency bulletins.

  In the transmission system according to the second aspect, a transmitting device that transmits emergency early warning using a transmission control signal of a terrestrial digital television broadcast wave includes a flag for identifying presence / absence of emergency early warning, and an emergency early warning after the flag. Whether or not it is legitimate telegram information when telegram information is set to store emergency bulletin including signal identification that can identify the type, and the telegram information is transmitted with the transmission control signal of terrestrial digital television broadcast waves Can be configured as a transmitting device that transmits information including the current time at the time of transmitting the emergency bulletin in the information of the emergency bulletin identified by the signal identification.

  In the transmission system according to the second aspect, the receiver that receives the transmission control signal from the terrestrial digital television broadcast wave includes a flag that identifies the presence or absence of emergency bulletin, a signal identification that can identify the type of emergency bulletin, In order to verify whether or not the message information is the message information, the message information for storing the emergency bulletin including the information on the current time when transmitting the emergency bulletin in the information of the emergency bulletin identified by the signal identification However, when it is specified in advance to be transmitted by a transmission control signal, the terrestrial digital television broadcast wave is received and the transmission control signal is extracted, and the signal information of the telegram information included in the transmission control signal is identified. When discriminating multiple types of information and analyzing the content of the identified type of emergency bulletin, when matching the current time information in the telegram information with the current time information on the receiver side, This size Early warning of the contents of the type can be configured as a receiver to analyze.

  In the transmission system according to the third aspect, the transmitting device that transmits the emergency early warning using the transmission control signal of the digital terrestrial television broadcast wave includes a flag for identifying presence / absence of the emergency early warning, and an emergency early warning after the flag. When the telegram information that stores the emergency bulletin including the signal identification that can identify the type is set and the telegram information is transmitted by the transmission control signal of the digital terrestrial television broadcast wave, the emergency bulletin transmitted by this signal identification is transmitted. It can be configured as a transmission apparatus that transmits the hierarchized emergency bulletin including the information of the page type as an identifier for further hierarchizing and transmitting, while transmitting the hierarchized emergency bulletin.

  In the transmission system according to the third aspect, the receiver that receives the transmission control signal from the terrestrial digital television broadcast wave includes a flag that identifies the presence or absence of emergency bulletin, a signal identification that can identify the type of emergency bulletin, Telegram information that stores emergency bulletins including information of page types as identifiers for transmitting hierarchical hierarchical bulletins by further hierarchizing and transmitting them. When it is specified in advance to be transmitted by a control signal, the transmission control signal is extracted by receiving a terrestrial digital television broadcast wave, and a plurality of types of signal identification of telegram information included in the transmission control signal are extracted. When determining the information and analyzing the contents of this type of emergency bulletin, the layered emergency bulletin is resolved based on the page type information. As well as it can be configured as a receiver for analyzing further layered information emergency bulletin that is hierarchical layering.

  In the transmission system according to the fourth aspect, the transmission device that transmits the emergency bulletin using the transmission control signal of the digital terrestrial television broadcast wave includes a flag for identifying presence / absence of the emergency bulletin and an emergency bulletin after the flag. When telegram information that stores emergency early warning including signal identification that can identify the type is set and different earthquake information is transmitted over a plurality of frames of a transmission control signal of terrestrial digital television broadcast waves, the different earthquakes are transmitted over a plurality of frames. When transmitting information, it can be configured as a transmission device that transmits an earthquake information number that indicates what number of earthquake information one frame indicates.

  In the transmission system according to the fourth aspect, the receiver that receives the transmission control signal from the terrestrial digital television broadcast wave includes a flag that identifies the presence or absence of emergency bulletin and a signal identification that can identify the type of emergency bulletin. When the telegram information storing the emergency bulletin is transmitted over multiple frames of the transmission control signal with different earthquake information, it is specified in advance to include an earthquake information number indicating what number of earthquake information each frame indicates. The terrestrial digital television broadcast wave is received and the transmission control signal is extracted, and a plurality of types of information of signal identification of the telegram information included in the transmission control signal are determined, and this determined type of emergency early warning When analyzing the contents of, based on the information of the earthquake information number, it is configured as a receiver that analyzes what number of earthquake information the current frame to receive indicates Rukoto can.

  Accordingly, 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 above-described embodiments, 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 Synchronization protection 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 supply control unit 21 Power supply 22 First power switch 23 Second power switch 25 Third power switch 131 Current time verification unit 132 Page type determination unit 133 Earthquake information analysis unit

Claims (2)

A receiver for receiving a transmission control signal from a terrestrial digital television broadcast wave,
A reference and a synchronization signal of the differential demodulation for synchronization, emergency bulletin a flag identifying the presence or absence of, after the flag, identifying available-whether the earthquake early as the type of early warning at the receiving side in a distinguishable signal identifying whether included in the region where the region of the broadcast waves is estimated a predetermined seismic intensity more than shaking for receiving and, the emergency bulletin and identified in accordance with the type defined by the signal type The telegram information to be stored is defined in advance so as to be transmitted by the transmission control signal of the broadcast wave, and different detailed information among the earthquake early warnings is set over different frames of the transmission control signal, and the flag and the signal identification is defined in advance to be transmitted in each and every frame, wherein the different details of the earthquake early warning identifies each of the different details It described a page number to which are predefined to be transmitted in the different frames,
A transmission control signal extracting means for receiving the terrestrial digital television broadcast wave and extracting the transmission control signal;
Flag monitoring means for monitoring the flag of the telegram information included in the transmission control signal sent in all frames;
Signal identification extraction judging means for discriminating plural types of information of signal identification of the telegram information contained in the transmission control signal sent in all frames ;
Information analysis means for analyzing the content of the determined type of emergency bulletin;
Equipped with a,
The information analysis means includes the flag indicating the presence of an emergency early warning, the signal identification indicating the presence of the emergency earthquake early warning, and the area of the broadcast wave being included in an area where a shake exceeding a predetermined seismic intensity is estimated. Means for determining whether or not
From the determined result, the flag indicates that there is an emergency early warning, the signal identification indicates that there is the emergency earthquake early warning, and the area of the broadcast wave is included in an area where a shake exceeding a predetermined seismic intensity is estimated. And a means for analyzing detailed information received according to the page number . The information analysis means includes the first page number and the regional information in which the different detailed information is preliminarily defined on the transmission side in a two-frame configuration of odd frames and even frames, and a shake exceeding a predetermined seismic intensity is estimated. The emergency earthquake set in one frame of the two-frame configuration and transmitting the information of the epicenter in the emergency earthquake warning together with the second page number in the other frame of the two-frame configuration The receiver according to claim 1, wherein detailed information of a bulletin is analyzed according to the page number.

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