WO2010050563A1 - 地上デジタルテレビジョン放送における緊急速報の受信機及び送信装置 - Google Patents
地上デジタルテレビジョン放送における緊急速報の受信機及び送信装置 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
- H04H20/59—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for emergency or urgency
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/86—Arrangements characterised by the broadcast information itself
- H04H20/95—Arrangements characterised by the broadcast information itself characterised by a specific format, e.g. an encoded audio stream
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H40/00—Arrangements specially adapted for receiving broadcast information
- H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
- H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a technology for transmitting and receiving emergency bulletins in digital terrestrial television broadcasting, and in particular, a receiver that receives an emergency bulletin activation signal with low power consumption and that receives the bulletins promptly when the emergency bulletin is issued, And it is related with the transmitter for transmitting reliably to the user of a receiver.
- Non-Patent Document 1 The Japan Meteorological Agency started providing emergency earthquake warnings (for example, see Non-Patent Document 1) to the general public from October 1, 2007. Accordingly, television and radio broadcasting stations are also broadcasting such as displaying or sounding them on a television screen together with a chime sound when the breaking news is announced. In addition, a part of the earthquake early warning radio broadcast started on April 1, 2008.
- one-segment service with partial reception particularly in the case of a so-called one-segment service with partial reception (hereinafter simply referred to as one-segment), a delay required for signal processing such as radio frequency (RF) signal demodulation, error correction, video codec, etc.
- RF radio frequency
- an ISDB-T Integrated Services Digital Broadcasting-Terrestrial, ARIB standard STD-B31
- TMCC Transmission and Multiplexing Confusion Control Control
- the transmission control signal receiving circuit includes a synchronization holding circuit based on the frame synchronization signal of the TMCC signal, and at the timing indicated by the count value by the synchronization holding circuit, in a frame and in frame units (out of frame) Can be operated intermittently to save power consumption.
- the power-on timing in the frame is, for example, about 30 msec from the synchronization signal to the emergency warning broadcast activation flag.
- the emergency broadcast type and the start or end of the emergency broadcast are presented by a combination of an emergency warning broadcast activation flag of the TMCC carrier and a signal type bit placed on a specific AC carrier in the partial reception segment, for example.
- ARIB standard STD-B10 emergency information descriptor and emergency broadcast video / audio are transmitted using an AC carrier.
- This emergency information descriptor includes a signal type bit and is transmitted in an AC signal of a partially received segment, and the video / audio is stored in an AC signal of another segment.
- the power is turned on or the channel is switched in preparation for the case where the receiver is not turned on or another channel is received.
- the TMCC signal in the partial reception segment is disclosed.
- a technique for reproducing other disaster / disaster prevention information and video / audio after receiving an AC signal and after power-on or channel switching see, for example, Patent Document 3).
- the above-mentioned techniques are all the same techniques regarding the receiver for terrestrial digital television broadcasts, with the aim of quickly starting up receivers of receivers who are not watching the broadcast.
- emergency warnings such as earthquake early warnings can be used in environments where the receiver is not watching the program, that is, in a state where the receiver is stored in a bag or pocket, or where the reception status is unknown, It is required that digital terrestrial television broadcast waves can be received even in a poor reception situation.
- the synchronization signal for frame synchronization is also the activation flag signal.
- the synchronization signal for frame synchronization is also the activation flag signal.
- the object of the present invention is to improve the frame synchronization performance and set the emergency early warning activation flag even in an environment where the received electric field strength is low so that the emergency early warning can be reliably transmitted to the receiver of the digital terrestrial television broadcasting. It is an object of the present invention to provide a receiver and a transmission device that can stand by.
- the receiver of the present invention is a terrestrial digital television broadcast wave receiver including an AC signal and a TMCC signal, and the TMCC signal and the AC signal have a differential demodulation reference and a synchronization signal based on the same reference. And at least one of the TMCC signal and the AC signal has telegram information including a flag for identifying presence / absence of emergency bulletin, and extracts a TMCC carrier that carries the TMCC signal; AC extraction means for extracting an AC carrier for carrying a signal, diversity combining means for performing analog addition on the TMCC carrier and the AC carrier, and a differential demodulation reference and synchronization signal of an output signal by the diversity combining means Frame synchronization means for performing frame synchronization on the basis of the frame synchronization frame obtained by the frame synchronization means In accordance with the timing, the flag value monitoring means for monitoring the value of the flag to determine the presence or absence of emergency warning, and the flag information indicating that the flag is emergency warning is detected by the flag monitoring means. And decoding means for decoding
- the broadcast wave is an ISDB-T terrestrial digital television broadcast wave, and includes four TMCC signals and eight AC signals
- the diversity combining means includes the 4 Frame synchronization is performed using a synchronization signal obtained by analog addition of a reference signal and a synchronization signal for differential demodulation received from the eight TMCC signals and the eight AC signals.
- the broadcast wave is an ISDB-T terrestrial digital television broadcast wave, and includes four TMCC signals and eight AC signals
- the diversity combining means includes the 4 Means for synthesizing the differential demodulation reference and synchronization signals received from the TMCC signals to obtain a first output signal, and combining the differential demodulation reference and synchronization signals received from the eight AC signals; It has means for obtaining a second output signal, and means for performing frame synchronization by a synchronization signal obtained by analog addition of the first output signal and the second output signal.
- the diversity combining means performs analog addition by maximum ratio combining.
- the telegram information is preliminarily defined so that the emergency bulletin having the same content is transmitted by four TMCC signals, and the flag monitoring means receives the four TMCC signals.
- the flag is monitored by analog addition.
- the telegram information is preliminarily defined so that emergency bulletins having the same contents are transmitted by eight AC signals, and the flag monitoring means receives from the eight AC signals.
- the flag is monitored by analog addition.
- the flag monitoring means performs analog addition by maximum ratio synthesis.
- the receiver includes a synchronization signal preliminary verification unit between the AC reception unit and the diversity combining unit, and the synchronization signal preliminary verification unit is included in the AC carrier.
- the transmitter of the present invention is a digital terrestrial television broadcast transmitter including an AC signal and a TMCC signal, and the TMCC signal and the AC signal have a differential demodulation reference and a synchronization signal based on the same reference. And at least one of the TMCC signal and the AC signal has telegram information including a flag for identifying the presence or absence of emergency bulletin, and diversity combining that performs analog addition on the TMCC carrier and the AC carrier on the receiving side The message information is transmitted so as to be possible.
- the transmission system of the present invention is a terrestrial digital television broadcast transmission system including an AC signal and a TMCC signal, and the TMCC signal and the AC signal have a differential demodulation reference and a synchronization signal based on the same reference. And at least one of the TMCC signal and the AC signal has telegram information including a flag for identifying the presence or absence of emergency bulletin, and diversity combining that performs analog addition on the TMCC carrier and the AC carrier on the receiving side
- TMCC extracting means for extracting a TMCC carrier
- AC extracting means for extracting an AC carrier carrying the AC signal
- Diversity combining means for performing analog addition on the TMCC carrier and the AC carrier
- frame synchronization means for performing frame synchronization based on a differential demodulation reference and a synchronization signal of an output signal by the diversity combining means
- the frame According to the timing of the frame acquired by the synchronization means, the flag value is monitored to determine the presence or absence of emergency breaking news, and the flag monitoring means detects a flag value indicating that the flag is emergency breaking news.
- a decrypting means for decrypting the message information.
- the frame synchronization performance is improved and the emergency early warning activation flag is set so that the emergency early warning can be reliably transmitted to the receiver of the terrestrial digital television broadcast. It is possible to stand by.
- emergency AC information is stored in the AC signal, and diversity combining (analog addition of received waves) is performed with the TMCC signal to improve the reception gain of the synchronization signal for frame synchronization.
- FIG. 1 conceptually illustrates the AC signal of this embodiment.
- the frame length is the same as that of the TMCC signal, is composed of 204 symbols of the OFDM signal, and 1 bit is transmitted for each symbol.
- the “differential demodulation reference” is a value based on the same generator polynomial (x 11 + x 9 +1) as the value W k of the BPSK signal assigned to the SP signal of the carrier number k, similarly to the TMCC signal.
- W k stored as the reference of differential demodulation described in the AC information carried by the eight AC carriers is 0, 0, 0, 0, 0, 1, 1, and 0, respectively.
- the “synchronization signal” is a 16-bit synchronization signal, and the value thereof is “0011010111101110” (odd frame) and its inverse (even frame), which are different values in the odd and even frames.
- the odd frame is “1,1, -1,1,1, ⁇ 1, ⁇ 1,1, ⁇ 1,1, ⁇ 1,1, ⁇ 1,1,1 "and even frames are" -1,1,1,1, -1, -1, -1,1,1,1,1,1,1, -1, -1, -1, 1 ”.
- W k is 1, these are inverted.
- the carrier numbers # 101, # 131, # 286 are described. And # 349 TMCC carriers and carrier numbers # 7, # 89, # 206, # 209, # 226, # 244, # 377 and # 407 and a total of 12 carriers
- the “synchronization signal” having the same content is transmitted (transmission diversity).
- “Activation flag signal” is 1-bit information for identifying the presence or absence of emergency bulletin. Here, it is transmitted following the “synchronization signal”.
- the value of the “activation flag signal” is the value representing the bit of “0” when there is an emergency warning, and the phase of the last symbol of the “synchronization signal” is continued. The phase is inverted as a value representing the bit of.
- the “activation flag signal” can be composed of 2 bits. In this case, “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).
- “Emergency breaking news identification signal” is a signal indicating the type of emergency breaking news. Information is provided as to whether the emergency bulletin represents emergency earthquake bulletin (earthquake motion warning information) or emergency warning broadcast. For example, 3 bits are used, “000” is an emergency earthquake warning, “001” is an emergency warning broadcast, “010” is an emergency earthquake warning test signal, and “011” is an emergency warning broadcast test signal. As with the “activation flag signal”, each 3-bit value is transmitted as a DBPSK-modulated value.
- the value of the “emergency warning identification signal” is read to identify the type of emergency warning, that is, what the emergency warning is.
- Various identification signals include information signals accompanying emergency bulletins such as “breaking news ID” (12 bits), “information number” (4 bits), “message type” (2 bits), and signals such as broadcaster identification. Is applicable.
- “Breaking News ID” is inserted as an identification number (ID number) of emergency breaking news.
- ID number an identification number of emergency breaking news.
- an earthquake early warning published by the Japan Meteorological Agency has an earthquake identification number that starts with “ND” and is created by arranging (year), month, day, hour, minute, and second. The lower 12 bits of this number are allocated and used. In other cases such as emergency alert broadcasting, an identification number is assigned in the same way.
- This “Breaking News ID” makes it possible to distinguish between the breaking news and other breaking news, even if a follow-up or cancellation information occurs in the same emergency bulletin.
- Information number is a number that is incremented by one each time a subsequent bulletin is released. It is given so that the receiver can recognize that it is a series of information and an emergency bulletin issued earlier. It is used repeatedly in the range of 0-15.
- “Telegram type” is used to indicate whether normal transmission in which an emergency bulletin is issued or whether the previously issued emergency bulletin is canceled (cancellation). Store it so that it can be canceled if a false early warning is generated. Using 2 bits, for example, “00” indicates that it is an emergency warning broadcast or public emergency earthquake warning (earthquake motion warning), and “01” indicates that it is a cancel information. If there is no emergency bulletin, “11” can be transmitted to provide insurance against the determination of the “activation flag signal”.
- an identification signal conforming to the ARIB standard STD-B14 can be used.
- “broadcast area identification” (6 bits), “prefectural compound flag” (1 bit), and “area operator identification” (4 bits) are stored.
- Each identification signal is similarly DBPSK modulated.
- “Emergency early warning information” is a part that stores necessary information for information that should be transmitted separately from broadcast, such as emergency earthquake early warning.
- a specific example is given in the case where the target of emergency warning is emergency earthquake warning and emergency warning broadcast. Information is stored only for emergency earthquake warning, and fixed bit (for example, all '1') for emergency warning broadcast. Is placed.
- the information that should be transmitted separately from the broadcast is the minimum necessary information for the receiver when the earthquake early warning is issued, and it is transmitted accurately, quickly and reliably. Information to be done. That is, it is information that allows the receiver to recognize how much magnitude / seismic magnitude of the earthquake will occur in the area where the receiver is located.
- the first method example directly conveys an area where strong shaking is expected.
- a 2-bit national prefectural identification flag signal is transmitted, “01” for national broadcasting, “00” for prefectural broadcasting or wide-area broadcasting, and “11” when not in use. Shall be transmitted.
- maximum predicted seismic intensity (4 bits) is stored if necessary.
- the “maximum predicted seismic intensity” corresponds to seismic intensity 4 or higher of 4, 5 weak, 5 strong, 6 weak, 6 strong, or 7. “Strong” and “weak” are distinguished by 1 and 0 respectively. Therefore, “0100”, “0101”, “1101”, “0110”, “1110”, and “0111” can be distinguished. However, this maximum predicted seismic intensity is the maximum predicted seismic intensity that is expected to be observed in any region of Japan due to the earthquake if it is nationwide broadcast, not for each specific region, and if it is a wide area or prefectural area broadcast, It is the maximum predicted seismic intensity that is expected to be observed in the area. An emergency earthquake bulletin is issued when the maximum predicted seismic intensity predicted to be observed in any part of Japan is greater than 5 seismic intensity.
- the second method example is an indirect method that transmits detailed earthquake information such as time of occurrence, epicenter latitude, longitude, depth, and magnitude, and calculates the predicted seismic intensity and predicted arrival time at the receiver that received the information. It is. More detailed alerts can be made for each region based on the recipient's wishes.
- the predicted arrival time of predicted seismic intensity and strong ground motion can be calculated from the acquired location information (latitude and longitude, depth) of the earthquake source, the magnitude of the earthquake (magnitude), and the degree of ground amplification. .
- the predicted seismic intensity is calculated as the measured seismic intensity I INSTR by the following formula.
- I INSTR 2.68 + 1.72 log (PGV) ⁇ 0.21 (1)
- PGV is the maximum speed [cm / s] of each point on the ground surface
- the maximum speed PGV 600 on the reference base (hard base, S wave speed 600 m / s) calculated by the maximum speed attenuation formula is a value obtained by multiplying the site amplification degree ARV i at the point to be the target in the national land information.
- PGV 1.31 PGV 600 ⁇ ARV i (2)
- x is easily calculated from the position information of the epicenter and the position information of the receiver. can do.
- ARV i is a value depending on the location, it can be selectively used based on the position information by being stored in advance in the receiver.
- the measured seismic intensity I INSTR can be easily calculated in the receiver by acquiring the location information and magnitude of the epicenter which is unknown in the receiver from the transmission side.
- the maximum predicted seismic intensity in the seismic intensity class is determined based on the relationship between the two shown in the following table.
- the estimated arrival time (required arrival time) from the time of the occurrence of the earthquake at the location where the receiver is located is the travel time table shown by the Japan Meteorological Agency based on the epicenter distance ⁇ [km] and the focal depth D [km] (For example, JMA2001) can be used for calculation.
- the epicenter distance ⁇ is a value that can be calculated from the location information (latitude and longitude) of the epicenter and the location information of the receiver.
- the “emergency breaking information” includes the “earthquake occurrence time” (17 bits), “seismic latitude” (11 bits), “seismic longitude” (12 bits), “ The “depth of the epicenter” (10 bits) and the “magnitude” (7 bits) are stored.
- Earthquake occurrence time is the time when an earthquake occurred, estimated after observation of P-waves, and transmitted to broadcast stations by public emergency earthquake alerts.
- the time of “earthquake occurrence time” is displayed in a range of 24 hours, the hour display is 5 bits, the minutes and seconds are 6 bits, for example, 13:25:37 is “01101
- ” is inserted only as a notation here, and is not inserted in actual transmission.
- “Latitude of the epicenter” and “longitude of the epicenter” represent the position of the epicenter on the ground surface. For example, latitude and longitude expressed with 1/10 degree accuracy such as 36.3 degrees north latitude and 136.5 degrees east longitude. Longitude. These are expressed as a numerical value of 10 times excluding the decimal point, with north latitude and east longitude being positive values, south latitude and west longitude being negative values.
- “seismic latitude” and “seismic longitude” are 363 and 1365, respectively, and 11 bits and 12 bits are assigned and expressed in binary numbers such as “00101101011” and “0101010101101”. Note that the negative value of south latitude or west longitude is a one's complement. For example, 36.3 degrees south latitude is expressed as “11010010100”.
- the depth of the epicenter is the depth of the epicenter from the ground surface, and is expressed as a numerical value with the unit [km]. For example, in the case of 30 km, it is 30, and is represented by a 10-bit binary number “0000011110”.
- Magnitude is a magnitude value indicating the magnitude of the earthquake, and is a numerical value with one decimal place, for example, 3.5. This is expressed as a 10-fold numerical value. That is, it is 35 and is a 7-bit binary number “0010011”.
- page number (2 bits) is added to “emergency breaking information” and transmitted.
- the “page number” is used for transmitting “emergency breaking information” by the above two methods over two frames and distinguishing information based on both methods when improving the convenience of the receiver.
- Parity bit is a parity bit used for error correction. Parity bits that enable error correction are targeted for 105 bits from the 18th bit excluding 17 bits to the 122nd bit immediately before the “parity bit” in addition to the “differential demodulation standard” and “synchronization signal”. 82 bits are stored. For example, error correction coding is performed using the shortened code (187, 105) of the difference set cyclic code (273, 191) in the same manner as the ISCC-T TMCC signal. Since error correction of about 8 bits is possible, the reliability of information can be increased and more reliable transmission can be achieved.
- “Reserve bits” are reserved bits for future expansion. Normally, “1” is stored. When “Emergency Early Warning Information” transmits the information of Method 1 to prefectures nationwide and transmits “maximum predicted seismic intensity” and “page number”, 10 bits remain in the “reserved bit”. In the method 2, it is 13 bits similarly.
- the reserve bits are put together, but there are cases where it is easier to deal with changes in the middle of operation if they are added in units of necessary information.
- “Reserve bit” is also DBPSK modulated.
- message information including the emergency bulletin (the message information format shown in FIG. 1)
- eight AC carriers in the partial reception segment of digital terrestrial television broadcasting are activated to identify synchronization signals and emergency bulletins.
- the flag signal is continuously transmitted, and an emergency warning identification signal, various identification signals, emergency warning information, a reserve bit, and a parity bit of an error correction code are transmitted.
- the receiver of Example 1 by this invention receives the format of the message
- the receiver can be included in any device such as a mobile phone, a personal digital assistant (PDA), a wristwatch, a table clock, a personal computer, or a home appliance.
- the 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).
- 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.
- the emergency signal is received by receiving the AC signal in the partial reception segment. Can receive information.
- FIG. 2 shows a block diagram of the receiver of the first embodiment.
- the receiver according to the first embodiment includes an antenna 1, an AC reception / synchronization establishment unit 2, an AC information analysis unit 3, a synchronization holding / power control unit 4, a warning generation unit 5, a power supply 6, an AC reception / A first power switch 7 for switching power supply to the synchronization establishing unit 2 and a second power switch 8 for switching power supply to the AC information analyzing unit 3 are provided.
- the AC reception / synchronization establishment unit 2 includes a frequency conversion unit 9, an AD conversion unit 10, an FFT 11, a TMCC extraction unit 26, an AC extraction unit 27, a diversity combining unit 27, and a frame synchronization detection unit 14. And an activation flag demodulator 13.
- the AC information analysis unit 3 includes an AC demodulation unit 15, an error correction unit 16, an AC decoding unit 17, and an information processing unit 18.
- the information processing unit 18 includes a position detection unit and a current time detection unit (not shown).
- the synchronization holding / power control unit 4 includes a frame synchronization holding unit 19, a timing control unit 20, an activation flag monitoring unit 21, and a power supply control unit 22.
- the frequency conversion unit 9 removes unnecessary frequency components from the received digital terrestrial broadcast wave signal input from the antenna 1 using a predetermined filter, selects a designated channel, and converts the frequency into an intermediate frequency signal. At the same time, it is amplified as appropriate and output. This channel selection can also be predetermined by the receiver.
- the AD conversion unit 10 converts the intermediate frequency signal of the reception signal output from the frequency conversion unit 9 into digital, and sends out a digital baseband signal.
- the FFT 11 performs an FFT (Fast Fourier Transform) operation on the effective symbol period of the OFDM symbol, and demodulates the digital baseband signal of the received signal into an OFDM 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 TMCC extraction unit 26 extracts only four TMCC carriers in the partial reception segment (segment number # 0) from the OFDM format stream of the received signal.
- the four TMCC carriers extracted here are supplied to the diversity combining unit 27.
- the AC extraction unit 12 extracts only 8 AC carriers in the partial reception segment (segment number # 0) from the OFDM stream of the received signal.
- the four AC carriers extracted here are supplied to the diversity combining unit 27 and the activation flag demodulating unit 13.
- the diversity combining unit 27 performs diversity combining (analog addition of received radio waves) on the four TMCC carriers and the eight AC carriers extracted by the TMCC extracting unit 26 and the AC extracting unit 12, toward the frame synchronization detecting unit 14. Output.
- the diversity combining demodulates the DBPSK modulated wave by performing the delay detection in each carrier, simply and go amplitude synthesis, the values of the reference W k of the SP signals and the differential demodulation by another means (not shown) Or perform a maximum ratio synthesis based on.
- the reception sensitivity of the “synchronization signal” transmitted by the TMCC carrier and the AC carrier can be increased. That is, the minimum received power that enables frame synchronization can be kept small.
- the receiver according to the first embodiment of the present invention can synthesize 12 carriers by the diversity combining unit 27 and perform frame synchronization with high reception sensitivity.
- the frame synchronization detection unit 14 detects a match between a TMCC carrier and an AC carrier that have been combined by the diversity combining unit 27 and a pattern, for example, a predetermined mode 3 that is stored and transmitted as a “synchronization signal”. When the two match, a frame synchronization signal (reset pulse) is generated at the head timing of the AC signal. Further, emergency breaking synchronization establishment information indicating whether or not emergency breaking frame synchronization is established is generated based on the frame synchronization signal.
- the activation flag demodulator 13 uses the stream of the eight AC carriers of the received signal extracted by the AC extractor 12 as the final symbol (the 16th symbol of the synchronization signal of each frame, with the first symbol of the frame as the 0th symbol. , Corresponding to the 17th symbol from the beginning of the frame) and the activation flag signal (the 17th symbol, the 18th symbol from the beginning of the frame), the activation flag signal is demodulated by delay detection, etc., and transmitted activation Estimate the value of the flag signal.
- the delay detection can be realized by, for example, multiplying the phase conjugate of the received signal of the 16th symbol by the received signal of the 17th symbol.
- Diversity combining based on eight (8) AC carriers is performed by performing phase conjugate products between the received signals for the two symbols on the eight carriers.
- TMCC carrier and AC carrier that is, processing such as delay detection, synthesis of four TMCC carriers, and synthesis of eight AC carriers are performed by diversity combining unit 27 and activation flag demodulating unit 13
- the circuit scale can be reduced, for example, by performing synthesis in the TMCC extraction unit 26 and the AC extraction unit 12 and then inputting to the diversity synthesis unit 27 and the activation flag demodulation unit 13.
- the diversity combining unit 27 combines the four combined signals of the TMCC carrier and the eight combined signals of the AC carrier.
- the activation flag demodulating unit 13 extracts and outputs an activation flag signal by timing control from the frame synchronization holding unit 14 (not shown).
- the synchronization holding / power control unit 4 includes a frame synchronization holding unit 19, a timing control unit 20, an activation flag monitoring unit 21, and a power supply control unit 22, which are always supplied with power from the power supply unit 6.
- the frame synchronization holding unit 19 includes, for example, a clock generator and a counter, and is controlled based on the frame synchronization signal output from the frame synchronization detection unit 14.
- the clock generated by the clock generator is counted by the counter, and the count value is A frame pulse is generated every time the predetermined value is reached, 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 20.
- the frame synchronization holding unit can generate a self-held frame pulse.
- the timing control unit 20 determines whether to perform an inter-frame intermittent reception mode, an intra-frame intermittent reception mode, or these A combination intermittent reception mode 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 21 acquires the value of the activation flag signal output from the activation flag demodulating unit 13, samples and holds the value, and outputs the value to the power supply control unit 22.
- the timing at which the activation flag monitoring unit 21 detects the activation flag signal is also controlled based on the frame pulse output by the frame synchronization holding unit 19.
- the power supply control unit 22 detects the AC reception / synchronization establishment unit 2.
- the first power switch 7 is controlled so as to control the power supply.
- the activation flag monitoring unit 21 outputs the activation flag signal “0” (that is, the state in which the emergency early warning has been issued)
- the power supply to the AC reception / synchronization establishment unit 2 is continued.
- the first power switch 7 is switched as described above, and the second power switch 8 is switched so as to start the power supply to the AC information analysis unit 3.
- the timing control unit 22 determines that the activation flag signal value “0” indicating that there is an emergency warning is changed to the normal state “1”, the timing control unit 22
- the power supply to the AC reception / synchronization establishment unit 2 is controlled by the first power switch 7 so that only the value of the activation flag signal is constantly monitored at the timing of the control signal from the AC information analysis unit 3
- the second power switch 8 is switched so that the power supply to is interrupted.
- the AC demodulation unit 15 When power is supplied to the AC information analysis unit 3, the AC demodulation unit 15, the error correction unit 16, and the AC decoding unit 17 are sequentially activated. In synchronism with the frame synchronization signal generated by the frame synchronization detection unit 14, the AC demodulation unit 15 first selects all eight locations in the partial reception segment (segment number # 0) extracted from the OFDM format stream of the reception signal. After the DBPSK modulated wave on the AC carrier is detected and diversity combined by the same operation as that of the activation flag demodulating unit 13, a level determination of 0 or 1 is performed to obtain an AC signal bit stream.
- the error correction unit 16 corrects the error of the received AC signal bit stream based on the value of the parity bit using, for example, a difference set cyclic code system.
- the AC decoding unit 17 decodes the content of each signal in a decoding format corresponding to the encoding method on the transmission side, that is, “activation flag signal”, “emergency early warning identification signal”, “various identification signals”, and “emergency early warning information”. Decrypt the contents of.
- the power supply control unit 22 can also be controlled to supply power to the AC information analysis unit 3 in the intra-frame intermittent reception operation or the inter-frame intermittent reception operation so as to acquire only all the information of the emergency bulletin. .
- the activation flag demodulator 13 and the AC demodulator 15 can be operated so as to send the result of majority decision between a plurality of frames.
- various modes of detecting or correcting an AC information error and decoding can be considered, and will be collectively described as a “decoding unit”.
- the information processing unit 18 receives the contents of each signal output from the AC decoding unit 17, confirms that the “start flag signal” certainly indicates “emergency breaking news”, and “emergency breaking news identification signal”. Classifies whether the emergency bulletin is an emergency earthquake bulletin or an emergency warning broadcast.
- the information processing unit 18 makes the one-segment receiver receive all signals in the partial reception segment and fix them so that all the receivers of the digital terrestrial television broadcast function.
- the receiver outputs a control signal for starting an operation of receiving signals of all segments.
- the information processing unit 18 reads all information decoded by the AC decoding unit 17 and issues a necessary warning to the warning generating unit 5 based on the read information when the emergency early warning is an emergency earthquake early warning.
- the control signal is output.
- the information processing unit 18 reads, for example, “strong earthquake area with seismic intensity 4 or higher” from the decoded “emergency breaking information”, and the position information detected by the position detection unit matches the “strong earthquake area with seismic intensity 4 or higher”. Then, a control signal to that effect is output to the warning generation unit 5.
- the information processing unit 18 reads, for example, “earthquake occurrence time”, “latitude of the epicenter”, “longitude of the epicenter”, “depth of the epicenter”, and “magnitude” from the decoded “emergency breaking information”, and the position With reference to the position information detected by the detector, the calculation based on the equation (1) is performed to calculate the predicted value of the measured seismic intensity. Further, with reference to the position information detected by the position detection unit and the current time information detected by the current time detection unit, the predicted arrival time of the main motion is calculated using a travel time table such as JMA2001, for example.
- a travel time table such as JMA2001
- the position detection unit detects position information indicating the regional position of the receiver.
- a position detection part grasps
- GPS Global Positioning System
- the current time detection unit detects current time information indicating the current time of the receiver.
- the current time detection unit is a time setting by input of a receiver, a standard radio wave (radio clock, JJY), GPS, or a TDT (TimeTiDate Table) included in a received signal of a received digital terrestrial broadcast wave or Current time information can be detected from TOT (Time Offset Table) or the like.
- the current time detection unit can detect the current time based on a signal from the base station when the receiver is provided in a mobile phone.
- the warning generation unit 5 displays characters on a display provided in the receiver, generates sound from a speaker provided in the receiver, issues a vibration warning by a vibrator provided in the receiver, or during normal operation. Perceptually generate warnings with different actions.
- the receiver 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.
- 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.
- the intra-frame intermittent reception mode and the inter-frame intermittent reception mode can be suitably used.
- the inter-frame intermittent reception mode functions more suitably, and when the reliability of AC signal synchronization establishment is increased, the intra-frame intermittent reception mode functions more suitably. It is also possible to use the inter-frame intermittent reception mode and the intra-frame intermittent reception mode in combination. By using these intermittent reception modes, the receiver of the present invention can greatly reduce power consumption.
- Inter-frame intermittent reception mode is determined when, for example, emergency early warning synchronization establishment information indicating that AC signal synchronization is not established is supplied.
- the ON duration of the first power switch 7 or the second power switch 8 is at least one frame or more. For example, when only one frame is used, the power consumption of the receiver can be greatly reduced. Furthermore, for example, when two frames are used, the reliability of the received signal can be improved by using even parity. Alternatively, for example, when 3 frames are used, it is possible to improve the reliability of the received signal by making a majority decision.
- 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.
- the on / off interval is set to a predetermined value (for example, 10 seconds).
- the power supply time to the AC reception / synchronization establishing unit 2 when the synchronization of the AC signal is not established it is possible to prevent the AC signal from being lost, and further, to analyze the AC information.
- the reliability of the received signal in the unit 3 can be improved. Further, standby power consumption can be reduced by increasing the on / off interval.
- 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.
- the power is turned on from the last symbol of the previous frame, and the power is turned off when reception of a required bit, for example, a start flag signal is completed.
- the standby power consumption can be reduced by setting the power supply time to the AC reception / synchronization establishing unit 3 at the time of establishing the synchronization of the AC signal to 18 symbols or 3 symbols.
- the power is turned on earlier by the corresponding time.
- the FFT 11 and the start flag demodulating unit 13 when it is necessary to hold in a memory for a certain symbol, the power is turned on and the power is cut off between the frequency converting unit 9 and the AD converting unit 10 and subsequent processing units. By shifting the timing, it is possible to save the operation of the preceding processing unit with high power consumption.
- the receiver can be transmitted in a short time of about 1 to 2 seconds. While saving power consumption, it can be received with higher sensitivity, and prompt emergency bulletin transmission is possible.
- the receiver according to the second embodiment of the present invention is a case corresponding to the combined use with the case where the AC carrier is used for a purpose different from the transmission of the emergency bulletin.
- the AC carrier is “a transmission path of additional information related to the transmission control of the modulated wave” and has been used for the purpose of broadcasting stations so far, and a general receiver has not seen it. It was a mechanism.
- This transmission is allowed on the other hand, it will be necessary to distinguish it from the transmission of emergency bulletin.
- This case is a case of a receiver in which it can be defined that the “synchronization signal” is not transmitted in the conventional transmission, and that the emergency early warning is transmitted when the “synchronization signal” is included.
- the synchronization signal and the emergency early warning are sent to, for example, eight AC carriers in the partial reception segment of digital terrestrial television broadcasting.
- the activation flag signal for identification is continuously transmitted, and the emergency early warning identification signal, various identification signals, emergency early warning information, the reserve bit, and the parity bit of the error correction code are transmitted.
- a signal different from the telegram information format including the emergency bulletin is transmitted or not transmitted depending on the circumstances of the broadcasting station.
- the receiver according to the second embodiment of the present invention basically receives a message information format (the message information format shown in FIG. 1) similar to that of the first embodiment of the present invention.
- the receiver can be included in any device such as a mobile phone, a personal digital assistant (PDA), a wristwatch, a table clock, a personal computer, or a home appliance.
- PDA personal digital assistant
- FIG. 3 shows a block diagram of the receiver of the second embodiment.
- the receiver according to the second embodiment includes an antenna 1, an AC reception / synchronization establishment unit 2, an AC information analysis unit 3, a synchronization holding / power control unit 4, a warning generation unit 5, a power source 6, an AC reception /
- the first power switch 7 for switching the power supply to the synchronization establishing unit 2 and the second power switch 8 for switching the power supply to the AC information analyzing unit 3 are provided.
- the configuration is the same as that of the receiver of Example 1.
- FIG. 3 is different from FIG. 3 in that the AC reception / synchronization establishment unit 2 is provided with a synchronization signal pre-verification unit 28 subsequent to the AC extraction unit 12.
- the synchronization signal pre-verification unit 28 can detect coincidence between the synthesized signal of the eight AC carriers extracted and output by the AC extraction unit 12 and the pattern of the “synchronization signal”, and can detect a frame pulse based on the “synchronization signal”. Check whether or not.
- the composite signal of the AC carrier is output to the diversity combining unit 27 and the activation flag demodulating unit 13.
- a control signal other than “emergency early warning” is transmitted to the diversity combining unit 27 and the activation flag demodulating unit 13 to prevent transmission of the combined signal of the AC carrier.
- the activation flag demodulator 13 and the activation flag monitoring unit 21 can detect the activation flag signal only when the “synchronization signal” is included in the AC carrier, so that the terrestrial digital television broadcast in which the emergency bulletin is not transmitted from the transmission side.
- the AC carrier information is not received as in the conventional receiver.
- the activation flag signal can be monitored immediately, so that the telegram information of the emergency bulletin is received at a necessary timing and presented to the receiver by the warning generation unit 5 Can do.
- the receiver according to the present invention can be provided in, for example, a mobile phone.
- the function of the receiver according to the present invention can be integrated into the decoding function.
- the mobile phone when the mobile phone is in the standby mode, it can be operated in the same manner as in the above-described embodiment.
- the flag value in the telegram information is set.
- 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 apparatus according to the present invention can improve the frame synchronization performance and transmit the emergency early warning even in an environment where the reception electric field strength is low, and thus is useful for the transmission system using a predetermined transmission control signal.
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Abstract
Description
IINSTR=2.68+1.72 log(PGV)±0.21 ・・・(1)
ここで、PGVは地表面での各地点の最大速度[cm/s]であり、最大速度減衰式で計算される基準基盤(硬質基盤、S波速度600m/s)での最大速度PGV600と国土数値情報にある各対象となる地点での地盤増幅度ARViとの乗算で求められる値である。
PGV=1.31 PGV600×ARVi ・・・(2)
log(PGV600)=0.58 (M-0.171)+0.0038 D-1.29
-log(x+0.028×100.50(M-0.171))-0.002x ・・・(3)
なお、本実施例1を含み本発明の各実施例の説明において、緊急速報の情報はISDB-T方式の地上デジタルテレビジョン放送波の部分受信セグメント(セグメント番号#0)内のAC信号により送出されるとしている。携帯電話など移動・携帯端末の多くでは、この部分受信セグメント(セグメント番号#0)を受信して番組を視聴する(ワンセグサービス)。よって、携帯電話などに具備される本発明の各実施例の受信機1は、緊急速報の情報を伝送するAC信号を受信できる。
一方、他のセグメントを受信する固定受信向けのデジタルテレビなどに具備される本発明の各実施例の受信機1においても、AC信号については部分受信セグメント内のものを受信することにより、緊急速報の情報を受信できる。
Claims (9)
- AC信号とTMCC信号とを含む地上デジタルテレビジョン放送波の受信機であって、
前記AC信号と前記TMCC信号は、同一の基準に基づく差動復調の基準及び同期信号を含み、
TMCC信号及びAC信号は、同一の基準に基づく差動復調の基準及び同期信号を有し、前記TMCC信号及び前記AC信号のうちの少なくとも一方は、緊急速報の有無を識別するフラグを含む電文情報を有し、
前記TMCC信号を搬送するTMCCキャリアを抽出するTMCC抽出手段と、
前記AC信号を搬送するACキャリアを抽出するAC抽出手段と、
前記TMCCキャリアと前記ACキャリアに対してアナログ加算を行うダイバーシティ合成手段と、
前記ダイバーシティ合成手段による出力信号の差動復調の基準及び同期信号に基づいてフレーム同期を行うフレーム同期手段と、
前記フレーム同期手段が取得したフレームのタイミングに従い、前記フラグの値を監視して、緊急速報の有無を判別するフラグ監視手段と、
前記フラグ監視手段によって前記フラグが緊急速報である旨を表すフラグ値を検出した場合に、前記電文情報を復号する復号手段と、
を備えることを特徴とする受信機。 - 前記放送波はISDB-T方式の地上デジタルテレビジョン放送波であり、4本のTMCC信号と8本のAC信号とを含み、
前記ダイバーシティ合成手段は、該4本のTMCC信号及び該8本のAC信号から受信した差動復調の基準及び同期信号をアナログ加算した同期信号によりフレーム同期を行うことを特徴とする、請求項1に記載の受信機。 - 前記放送波はISDB-T方式の地上デジタルテレビジョン放送波であり、4本のTMCC信号と8本のAC信号とを含み、
前記ダイバーシティ合成手段は、該4本のTMCC信号から受信した差動復調の基準及び同期信号を合成して第1の出力信号を得る手段と、
該8本のAC信号から受信した差動復調の基準及び同期信号を合成して第2の出力信号を得る手段と、
前記第1の出力信号と前記第2の出力信号をアナログ加算した同期信号によりフレーム同期を行う手段とを有することを特徴とする、請求項1に記載の受信機。 - 前記ダイバーシティ合成手段は、最大比合成によってアナログ加算を行うことを特徴とする、請求項1ないし請求項3のいずれか一項に記載の受信機。
- 前記電文情報は、同一内容の緊急速報が4本のTMCC信号にて伝送されるように予め規定され、
前記フラグ監視手段は、該4本のTMCC信号から受信した前記フラグをアナログ加算して監視することを特徴とする、請求項2又は3に記載の受信機。 - 前記電文情報は、同一内容の緊急速報が8本のAC信号にて伝送されるように予め規定され、
前記フラグ監視手段は、該8本のAC信号から受信した前記フラグをアナログ加算して監視することを特徴とする、請求項2ないし請求項3のいずれか一項に記載の受信機。 - 前記フラグ監視手段は、最大比合成によってアナログ加算を行うことを特徴とする、請求項5ないし請求項6のいずれか一項に記載の受信機。
- 前記受信機は、前記AC受信手段と前記ダイバーシティ合成手段との間に、同期信号事前検証手段を備え、
前記同期信号事前検証手段は、前記ACキャリアの中から同期信号に基づくフレームパルスの存在を検証する手段と、
該同期信号が検出された場合は、前記ACキャリアを前記ダイバーシティ合成手段及び前記フラグ監視手段へ受渡す手段と、
該同期信号が検出されない場合は、前記ACキャリアの送出を防止する手段とを有することを特徴とする、請求項6に記載の受信機。 - AC信号とTMCC信号とを含む地上デジタルテレビジョン放送の送信装置であって、
TMCC信号及びAC信号は、同一の基準に基づく差動復調の基準及び同期信号を有し、前記TMCC信号及び前記AC信号のうちの少なくとも一方は、緊急速報の有無を識別するフラグを含む電文情報を有し、受信側でTMCCキャリアとACキャリアに対してアナログ加算を行うダイバーシティ合成を可能とするように、前記電文情報を送信することを特徴とする送信装置。
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