JP5247225B2 - Receiver for receiving emergency breaking news in digital terrestrial television broadcasting and watch with receiver - Google Patents

Description

  The present invention relates to a technology for transmitting and receiving emergency bulletins in terrestrial digital television broadcasting, and more particularly, to a receiver that quickly and reliably receives emergency earthquake bulletins and a clock with a receiver.

  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 method 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 mechanism is known that operates while suppressing standby power consumption and activates a receiver that is not turned on to notify the receiver (see, for example, Patent Document 1). By providing a transmission control signal receiving circuit for detecting an emergency warning broadcast activation flag, when the emergency warning broadcast activation flag is 1, the digital terrestrial television broadcast receiver is turned on and the emergency warning broadcast is sent to the receiver. Is a technology that encourages viewing.

  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 flag for emergency warning broadcast 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 and start or end of the emergency bulletin. In addition, the emergency information descriptor of the ARIB standard STD-B10 and the video / audio of the emergency breaking news are transmitted using the AC carrier. This emergency information 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.

  In addition, a case is known in which a clock familiar to daily life is used as a terminal for receiving an emergency warning broadcast or an earthquake early warning and transmitting it to a user of the receiver. For example, a technique of a clock that receives an emergency warning broadcast or receives an emergency warning broadcast from the Internet or the like and displays it on the clock or emits a sound is disclosed (for example, Utility Model Document 1). reference). Also, in a terminal equipped with a P-wave seismometer, an emergency earthquake bulletin is received via an information communication network, and the information is transmitted to a portable terminal having a GPS function, thereby receiving the information. However, a technique for transmitting the earthquake early warning to the user of the mobile terminal is disclosed (for example, see Patent Document 3). A wristwatch capable of receiving FM data broadcasting or the like is presented as an example for the portable terminal.

JP 2006-319771 JP2007-243936 JP 2006-112922 A Actual application 2007-4489 “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>

  As described above, there is a possibility that emergency earthquake bulletins can be transmitted by terrestrial digital television broadcasting. In that case, it is possible to broadcast all over the country as well as the current emergency alert broadcasting.

  At this time, in order to accurately transmit the earthquake early warning to the receiver user in the earthquake stricken area reported by the earthquake early warning, the user of the receiver is in the area subject to the earthquake early warning. In some cases, it is desirable to be able to receive the earthquake early warning reliably.

  For that purpose, the transmitting side of the terrestrial digital television broadcast may transmit the information on the earthquake early warning so that the area targeted for the earthquake early warning or the area where the receiver is located can be specified. On the other hand, the receiver side needs to be able to confirm the coincidence between the predicted disaster area indicated by the earthquake early warning of terrestrial digital television broadcasting and the location of the receiver.

  In other words, the receiver that receives the earthquake early warning of terrestrial digital television broadcasting needs a means for recognizing the area.

  On the other hand, clocks such as table clocks are one of the devices familiar to people's lives. The provision of a receiver for receiving the earthquake early warning of terrestrial digital television broadcasting is extremely meaningful, and leads to safety and security.

  At this time, in order to determine whether the clock equipped with a terrestrial digital television broadcast receiver and receiving the earthquake early warning is located in a strong earthquake area to which the earthquake early warning warns, the position of the clock is previously determined. I need to know the information.

  However, since the timepiece disclosed in the above-mentioned utility model document 1 cannot detect its own position, further contrivance is required to be applied to the case of emergency earthquake warning.

  In addition, the portable terminal disclosed in Patent Document 3 described above can obtain position information by the GPS function. However, since the portable terminal is generally used indoors such as a table clock, an antenna line is used indoors for broadcast waves. There is no concern about use because it is pulled in or received using a simpler re-transmission device. On the other hand, GPS functions that need to receive radio waves from multiple satellites at the same time are often not available indoors. . In addition, having wireless devices other than broadcast wave receivers is not economical in terms of power consumption or the like.

  Therefore, a receiver and a watch with a receiver that can easily present position information different from GPS are desired.

  An object of the present invention is to provide a receiver and a clock with a receiver that specify a position of a receiver by using a postal code associated with position information and appropriately receive an emergency bulletin, particularly an earthquake early warning. .

A receiver according to the present invention is a receiver that receives an AC signal from a terrestrial digital television broadcast wave, and stores at least a flag for identifying the presence or absence of an earthquake early warning and an emergency early warning including information on the earthquake early warning. The telegram information is defined in advance to be transmitted as an AC signal having the same frame length as that of the TMCC signal. A means for receiving the terrestrial digital television broadcast wave and extracting the AC signal, and a zip code are set. Means for identifying the position of the receiver and detecting it as position information of the receiver, and when the flag value identifies that there is an earthquake early warning, the one extracted from one frame of the AC signal Based on the information of the earthquake early warning, it is determined whether or not the area specified by the location information corresponds to the area subject to the earthquake early warning, and a warning is given if applicable. And a warning means for emitting. Preferably, the information of the earthquake early warning includes "strong earthquake area with seismic intensity 4 or higher" or "seismic area" capable of estimating "strong earthquake area with seismic intensity 4 or higher", and the warning means includes the position information Warn if it matches the “strong earthquake area with seismic intensity 4 or higher”.

In the receiver according to the present invention, preferably, the information of the emergency earthquake bulletin includes information of “seismic latitude”, “seismic longitude”, and “seismic depth ” , and using the information, and means for calculating the intensity expected arrival time of the seismic (principal motion) to areas specified by the position information, the warning unit may issue a warning to come before Symbol predicted arrival time.

Furthermore, the receiver-attached timepiece according to the present invention is a timepiece including the receiver according to the present invention, wherein the postal code information is input using a time setting function including a time display function in the receiver-attached timepiece , information of the earthquake early warning, and said Rukoto be displayed using the time display function.

  ADVANTAGE OF THE INVENTION According to this invention, the receiver which can transmit an emergency earthquake early warning accurately according to the area where the said user exists, and the timepiece with a receiver can be provided.

  First, a receiver according to an embodiment of the present invention will be described. In addition, it becomes clear from the description of the receiver of the present embodiment that it can be configured as a clock with a receiver.

  The receiver 1 and the timepiece equipped with the receiver 1 of this embodiment transmit an emergency early warning (hereinafter, information including emergency warning broadcast and emergency earthquake early warning is collectively called emergency early warning) using an AC signal. In the terrestrial digital broadcasting service, it is a device that receives the signal transmitted by the AC signal, specifies the position of the receiver using the zip code associated with the position information, and provides the emergency bulletin, especially the emergency earthquake bulletin It makes it possible to receive properly.

  For example, in the case of the mode 3 synchronous modulation section of the partial reception segment (segment number # 0) of the ISDB-T terrestrial digital television broadcast wave, the AC signal is carrier numbers # 7, # 89, # 206, # 209. , # 226, # 244, # 377 and # 407 are signals carried by AC carriers at eight locations.

  For example, when a broadcaster receives an earthquake early warning from the Japan Meteorological Agency, an earthquake early warning based on the format example of the telegram information shown in Table 1 as a representative example is transmitted by a transmission apparatus related to ISDB-T digital terrestrial television broadcasting. Information, that is, earthquake early warning information such as earthquake occurrence time, location (latitude, longitude, depth), and scale is stored in all of the AC information carried by the eight AC carriers, and the receiver 1 Send to. The hardware configuration of the transmission apparatus related to ISDB-T digital terrestrial television broadcasting is known and not shown.

  That is, a message storing the same frame length as the TMCC signal, the same phase reference and synchronization signal as the TMCC signal, at least a flag for identifying the presence or absence of the earthquake early warning, and an emergency early warning including information on the emergency earthquake early warning Information (the format of the telegram information illustrated in Table 1) is defined in advance so as to be transmitted from the transmission device by an AC carrier.

  In order to facilitate understanding of the present invention, the case where all the AC information carried by the mode 3 AC carrier in ISDB-T terrestrial digital television broadcasting will be described below. Note that is also applicable.

  Table 1 shows telegram information for accurately, promptly and reliably transmitting information necessary for the receiver in order to deliver the earthquake early warning. For example, when strong shaking (seismic intensity of 5 or less) is estimated, it is desired to transmit information that enables the receiving side to know the area name and the area name whose seismic intensity is 4 or more.

  Therefore, the broadcaster multiplexes and transmits the telegraphic information of the earthquake early warning as shown in Table 1 on the AC signal in the partial reception segment of the terrestrial digital television broadcast by the terrestrial digital television broadcast transmitter. can do. For example, a broadcaster uses a digital terrestrial television broadcasting transmission device to specify the “earthquake occurrence time”, the place of occurrence (“seismic latitude”, “seismic longitude”, “seismic depth”), and “magnitude”. This is transmitted together with an earthquake early warning activation flag for identifying the earthquake early warning (set to 1 at the time of early warning and 0 otherwise).

  “Various flags” presents information such as “emergency warning broadcast activation”, “emergency earthquake bulletin activation / identification”, “normal” / “training” identification, and “news breaking” presence / absence. For example, 9 bits are assigned to “various flags”. Basic information classification is performed by the upper 6 bits. From the 7th bit onwards, the copy bit of “Earthquake Early Warning activation / identification” is put in the 7th bit, and 1 or 0 is put in the value of the 8th bit so that the number of 1s in the first 8 bits is an even number Thus, the reception errors of “various flags”, especially “emergency earthquake early warning activation / identification” are dealt with. In the latter, the number of 1s in the first 8 bits is made an even number to form an even parity, and an even error can be detected on the receiving side. A buffer bit is placed at the ninth bit. The buffer bit is for securing a buffering time until data detection when the power is turned on from the standby operation.

  Specifically, the “various flags” are flags that can identify the presence / absence of an emergency earthquake news program, the presence / absence of a data broadcast, the presence / absence of an emergency warning broadcast, and normal times. For example, the receiving side can recognize a combination of bits corresponding to the activation of “Earthquake Early Warning”. As an example, from a state of “none” (000001010) in a normal state, a combination of bits corresponding to an emergency earthquake warning, for example, “emergency warning broadcast, emergency earthquake warning (with program, no data)” (110100100) state Is received by the receiver. Thereby, the receiver can know that “there is an emergency earthquake news program and there is no data broadcast”.

  The “phase reference”, “synchronization signal”, and “parity bit” are the same as those of the TMCC signal. In the case of ISDB-T terrestrial digital television broadcasting, one symbol of the OFDM (Orthogonal Frequency Division Multiplexing) method is used as a reference. The 204 bits of the DBPSK signal are allocated to the same 204 symbols as the TMCC signal to form one frame. Therefore, the signal of the format described in Table 1 is transmitted in one frame of the OFDM signal. The “parity bit” is, for example, a parity bit used for error correction based on a predetermined difference set cyclic code system.

  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.

“Phase reference” is the same as the TMCC signal.
A value based on the same generator polynomial (x ¹¹ + x ⁹ +1) as the value W _{i of the} BPSK signal allocated to the (Pilot) signal will be described, but an example in which an AC carrier is used for transmission of telegram information will be described. 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 "phase reference" in the description to the AC information this eight of AC carrier carries are each 0,0,0,1,1,1,1 and 1. 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.

  Information related to “earthquake occurrence time”, “location of the earthquake”, “latitude of the epicenter”, “longitude of the epicenter”, “depth of the epicenter”, and “magnitude” of the magnitude of the earthquake will be described in detail later. This is information based on the description in Patent Document 1, and is transmitted with a parity code for error correction.

  FIG. 1 shows a receiver 1 according to an embodiment of the present invention. The reception part of the AC signal in the receiver 1 includes a frequency conversion circuit 6, an AD conversion circuit 7, an FFT 8, an AC extraction circuit 9, an error correction circuit 16, an AC decoding circuit 17, and a prediction information calculation unit 18. And warning means 22.

  The time / position display control portion in the receiver 1 for functioning as a receiver with a clock includes a current time counting circuit 25, a display control circuit 26, a time detection means 27, a position detection means 28, and a zip code input circuit. 29.

  The frequency conversion circuit 6 removes unnecessary frequency components from the 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. This circuit amplifies and outputs. This channel selection can also be predetermined by the receiver.

  The AD conversion circuit 7 converts the intermediate frequency signal output from the frequency conversion circuit 6 into digital, and sends out 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 AC extraction circuit 9 performs delay detection by DBPSK from the OFDM format stream, and then performs a level determination of 0 or 1 to obtain an AC signal bit stream.

  The error correction circuit 16 synchronizes with the frame synchronization signal generated by the frame synchronization detection circuit 10 based on the emergency early warning information (AC signal), for example, the parity bit of the difference set cyclic code system, if it has the parity bit. Correct the error.

  The AC decoding circuit 17 decodes emergency bulletin information in a decoding format corresponding to the encoding method on the transmission side.

  The prediction information calculation means 18 calculates the prediction information of the seismic intensity and the arrival time of each area from the decoded emergency early warning information, for example, if it is an emergency earthquake early warning. The prediction information calculation means 18 is connected to the time detection means 27 and the position detection means 28 in order to acquire the position of the receiver 1 and the current time. Further details of the function of the prediction information calculation means 18 will be described later.

  The time detection unit 27 acquires and holds the current time from the current time counting circuit 25 of the clock, and supplies the current time information to the prediction information calculation unit 18. The terminal provided with the receiver 1 is a clock (the configuration of the clock itself is known and will not be described), and counts the current time. The current time counting circuit 25 is a part that also functions as a watch itself, and always counts the current time. The current time is corrected by manual input by the watch user, periodically from a standard radio wave, or by periodically receiving digital terrestrial television broadcasts, and from the TDT (Time Date Table) included in the received signal. Time information can be detected and performed. The output signal of the current time counting circuit 25 is also input to the display control circuit 26, and the display control circuit 26 controls to display the current time on the display unit 33 of the clock.

  The position detecting means 28 is connected to a postal code input circuit 29 which is the main part of the present invention. The 7-digit postal code corresponding to the place where the clock is installed (that is, the address) is set in the postal code input circuit 29 by the operation of the clock user, and the position detecting means 28 is set from the postal code input circuit 29. The postal code information is acquired to identify and detect the address, and the position information of the receiver 1 is supplied to the prediction information calculation means 18.

  The operation of the prediction information calculation unit 18 will be described in more detail. From the telegram information of the earthquake early warning as shown in Table 1, that is, the information on the location information (latitude, longitude, depth) of the earthquake source and the magnitude (magnitude) of the earthquake, and the ground strength that can be specified in advance, Calculate the predicted seismic intensity and the predicted arrival time of strong ground motion (main motion). Furthermore, the prediction information calculation means 18 can also calculate the absolute time of the predicted arrival time by adding the earthquake occurrence time.

  Specifically, the prediction information calculation means 18 calculates the predicted seismic intensity and the predicted arrival time of strong ground motion (main motion) as follows.

The 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)

  Since the prediction information calculation means 18 acquires position information from the position detection means 28 and can grasp the point where the receiver is present, x is easily calculated from the position information of the epicenter and the position information of the receiver. be able to. Note that the latitude and longitude of the representative point are set in advance as values corresponding to the 7-digit zip code and the address of the area.

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

Therefore, the measured seismic intensity I _INSTR can be easily calculated in the receiver 1 by acquiring the location 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 2, it is converted into information on the maximum predicted seismic intensity in the seismic intensity class.

  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.

  As described above, the prediction information calculation means 18 has the position of the receiver 1 and the ground amplification degree based on the position, the latitude, longitude and depth of the epicenter transmitted by the emergency earthquake warning of the digital terrestrial television broadcast, and Using the magnitude, the epicenter distance x is calculated, and the calculations of equations (1) to (3) are performed to calculate the predicted seismic intensity at the point where the receiver is located. Then, the epicenter distance Δ is calculated, and the predicted arrival time is calculated from the travel time table such as JMA2001 and the current time information acquired from the time detection means 27.

  FIG. 6 shows a specific configuration of the zip code input circuit 29 and a specific configuration example of the current time counting circuit 25, the display control circuit 26, and the display unit 33.

  The zip code input circuit 29 includes a zip code setting circuit 43 and a setting information storage circuit 45, and preferably a switching circuit 42 is provided between the current time counting circuit 25 and the zip code input circuit 29. The switching circuit 42 is responsible for displaying a signal for displaying the current time information and the zip code setting information obtained from the current time counting circuit 25 and the zip code input circuit 29 on the display unit 33, for example, “hour, minute”. It can be sent to the display control circuit 26.

  The zip code setting circuit 43 is incorporated in the interface circuit 41 for inputting the zip code by using the setting jig on the back of the watch, for example, by the user's operation of the receiver-equipped clock constituted by the receiver 1. The numerical value of the inputted zip code is recognized in conjunction with 42, and the numerical value is stored in the setting information storage circuit 45.

  An example of the interface circuit 41 of the zip code setting circuit 43 is shown.

  FIG. 4 is a diagram schematically showing a user interface 34 and a display unit 33 in the case of a digital type timepiece having a receiver according to an embodiment of the present invention.

  In FIG. 4, “normal operation” → “time setting” → “alarm setting” → “postal code input (3 digits)” → “postal code input (−below, the first two digits) with the“ set ”button 34-1 "→" Postal code input (-the following two digits) "→" Normal operation "is switched. For example, with the “+” and “−” buttons, numerical values for the state set by the “set” button 34-1 are input. In addition, increment (“+”) and decrement (“−”) are represented. “Alarm setting” is set to “ON” when one of the “+” and “−” buttons is pressed, and set to “OFF” when pressed simultaneously.

  For example, as shown in the display unit 33 in FIG. 4, a zip code can be set using a time display function in a digital clock.

  In the case of an analog type timepiece, the user interface 35 or the like can be preferably used.

  FIG. 5 is a diagram schematically showing a user interface in the case of an analog type timepiece having a receiver according to an embodiment of the present invention.

  In this case, “clock” 35-1, “alarm” 35-2, and “mail” 35-3 are switched by slide switch 35-6. In each state, turn the knob 35-4 to the right (“+”) or the left (“−”) to change the number. The “postal” number is input by switching the dial switch 35-5 one digit at a time. The numerical value is confirmed by pressing the knob 35-4 once. When inputting this zip code, for example, the minute hand indicates the dial of each time on the clock face (for example, 1 to 12 o'clock 12:00 and 1 to 9 o'clock are set to 0 to 9). The user of the watch confirms the value and operates it. The “alarm” 35-2 is set to “OFF” when the same knob 35-4 is pressed twice.

  Using such a user interface, the zip code setting circuit 43 enables the input of a zip code for recognizing the region setting position of the receiver 1.

  The setting information storage circuit 45 stores the output of the postal code setting circuit 43 together with the identification of the postal code digits. The output of the setting information storage circuit 45 is sent to the position detection means 28.

  The switching circuit 42 switches the numerical value sent to the display control circuit 26 so that the output of the current time counting circuit 25 and the output of the postal code setting circuit 43 can be switched and displayed, and the numerical value read by the postal code setting circuit 43. A signal for switching with the change of the postal code digit is output.

  As shown in FIG. 6, the upper display unit 33-1 or the lower display unit 33-2 of the display unit 33 is switched by the switching circuit 42 to count the current time (for example, hour, minute, second) and the zip code. Setting or input numerical value is displayed separately.

  Note that the time setting and alarm setting inputs in the user interface are connected to the switching circuit 42 (not shown).

  The warning means 22 displays the characters on a display device (a time display device of the timepiece can be used as it is) included in the table clock provided with the receiver 1 or a speaker included in the table clock provided with the receiver 1. Or a vibration warning by a vibrator provided in the table clock provided with the receiver 1, or a perceptual warning by an operation different from the normal operation.

  An example of displaying an emergency earthquake bulletin using the clock display unit 33 will be described.

  In the first example, priority is given to breaking news, and only the predicted seismic intensity in the area is calculated by the prediction information calculation means, and presented when the seismic intensity 4 exceeds the reference value.

  In FIG. 2, the example of a display in the display part 33 at the time of receiving an earthquake early warning is shown. The date display part of the upper display unit 33-1 receives the earthquake early warning as well as explicitly displaying “Earthquake Early Warning (Meteorological Agency)” from the state before the reception (FIG. 2A) and presenting a warning. Transition to a later state (FIG. 2B).

  The second example presents the predicted seismic intensity and the estimated margin time (remaining number of hours) in the area, and how much earthquake will come to the user of the watch, and how much more margin is left Or present.

  FIG. 3 shows still another example of display in the earthquake early warning. Along with the explicit display of “Earthquake Early Warning (Meteorological Agency)” similar to FIG. 2, the display part of the time (hour, minute) of the lower display unit 33-2 is the state before reception (FIG. 3 (A)). After receiving, the display changes to “Seismic Intensity” and “Remaining Time” until the main motion reaches the area, and shows a warning (FIG. 3B). In the example of FIG. 3, an example of “seismic intensity 5 strong, remaining time 12 seconds” is shown.

  Next, the operation of the receiver 1 of this embodiment is confirmed.

  The receiver 1 receives, for example, a one-segment signal of terrestrial digital television broadcasting. That is, symbol synchronization is performed by the guard interval correlation or the like from the OFDM signal received by the antenna 5 and received on the selected channel, and an AC signal is extracted through FFT calculation.

  Furthermore, the receiver 1 of the present embodiment performs frame synchronization of the AC signal based on the synchronization signal included in the message information and multiplexed on the AC signal.

  The receiver 1 according to the present embodiment monitors the “Emergency Earthquake Warning” activation flag included in the telegram information according to the timing obtained based on the frame synchronization, and when the activation flag is 1, it continues thereafter. Receiving the telegram information, it recognizes the rest of the telegram information, that is, information relating to the “earthquake occurrence time”, “seismic latitude”, “seismic longitude”, “seismic depth”, and “magnitude”.

  And the prediction information calculation means 18 is based on the received information, position information, and the current time according to the above-described methods (calculations of formulas (1) to (3) and a travel time table such as JMA2001). Calculate the predicted seismic intensity and predicted arrival time of the main motion in the area.

  When the seismic intensity is a reference value (seismic intensity of 4 or more), information on the emergency earthquake warning information by the warning means 22 is presented (display, warning sound, voice, etc.)

  Therefore, in addition to the current time counting function of the clock, in the technique disclosed by the present invention, the prediction information calculation means 18 can specify the position information input via the postal code input circuit 29. From the number, the corresponding “address” and “latitude and longitude” of the area are derived.

  In addition, as the telegram information of previous earthquake early warnings, “Earthquake time”, “Latitude of the epicenter”, “Longitude of the epicenter”, “Depth of the epicenter”, and “Magnitude” are transmitted and received and predicted by the receiver. In the example, the prediction information calculation means 18 calculates the seismic intensity and the predicted arrival time of the main motion. The calculation means 18 may determine whether or not the “strong earthquake area having a seismic intensity of 4 or more” matches the position information of the area, and if it matches, the information may be presented to the warning means 22.

  The receiver 1 according to the above-described embodiment has been described as receiving the earthquake early warning transmitted by the AC signal. However, the receiver 1 is configured to receive the emergency warning broadcast or the earthquake early warning transmitted by the TMCC signal. The same effect can be obtained. That is, in consideration of the future expandability of TMCC, even when an earthquake early warning is transmitted using a currently unused part of TMCC and a reserve bit, the operation can be performed in the same manner as in the case of emergency warning broadcasting.

  According to the receiver 1 and the receiver-attached timepiece of the embodiment, the location of the receiver can be specified using the zip code associated with the location information, and the emergency alert broadcast can be appropriately received.

  While the above embodiments have been described with specific examples, it will be apparent to those skilled in the art that many variations and substitutions can be made within the spirit and scope of the 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 a table clock, for example. The functions of the receiver according to the invention can also be integrated. For example, when the table clock has several changeover switches, it can be applied as in the above-described embodiment. The present invention can be applied to various types of timepieces such as wall clocks and wall clocks. Furthermore, although the emergency early warning has been described as being transmitted by an AC signal, it may be configured to be transmitted by a TMCC signal. Accordingly, the invention should not be construed as limited by the embodiments described above, but only by the claims.

  The receiver according to the present invention enables reliable transmission of emergency warnings such as emergency warning broadcasts and earthquake early warnings, so it is useful for applications that are used in combination with various daily life devices as a device that immediately receives notification of emergency warnings. is there.

FIG. 2 is a diagram illustrating a receiver according to an embodiment of the present invention. It is a figure which shows the example of a display of the earthquake early warning received via the receiver of one Example by this invention. It is a figure which shows another example of a display of the emergency earthquake bulletin received via the receiver of one Example by this invention. It is a figure which shows typically the user interface and display part in the case of the digital type timepiece which comprises the receiver of one Example by this invention. It is a figure which shows typically the user interface in the case of the analog type timepiece which comprises the receiver of one Example by this invention. It is a figure which shows the specific structure of the postal code input circuit in the receiver of one Example by this invention, and the specific structure example of a present | current time counting circuit, a display control circuit, and a display part.

Explanation of symbols

1 Receiver 5 Antenna 6 Frequency Conversion Circuit 7 AD Conversion Circuit 8 FFT
9 AC extraction circuit 16 Error correction circuit 17 AC decoding circuit 18 Prediction information calculation means 22 Warning means 25 Current time counting circuit 26 Display control circuit 27 Time detection means 28 Position detection means 29 Zip code input circuit 33 Display unit 33-1 Upper display Department (also used for “Earthquake Early Warning” and “Month and Day” display screens)
33-2 Lower display (also used for “hour, minute” and “seismic intensity, remaining time” display screens)
34, 35 User interface 34-1 “Setting”, “+”, “−” buttons 35-1 “Time” menu 35-2 “Alarm” menu 35-3 “Postal” menu 35-4 Knob 35-5 Dial switch 35-6 slide switch 41 interface circuit 42 switching circuit 43 zip code setting circuit 45 setting information storage circuit

Claims (4)

A receiver for receiving an AC signal from a terrestrial digital television broadcast wave,
The telegram information that stores at least the flag that identifies the presence or absence of the earthquake early warning and the emergency early warning including information on the earthquake early warning is defined in advance to be transmitted by an AC signal having the same frame length as the TMCC signal. And
Means for receiving a terrestrial digital television broadcast wave and extracting an AC signal;
Means for setting the postal code to identify the position of the receiver, and detecting the position information of the receiver;
When the value of the flag identifies that there is an earthquake early warning, the area specified by the location information is based on the information on the earthquake early warning extracted from one frame of the AC signal. A receiver comprising: warning means for determining whether or not the area falls under the target area and issuing a warning when the area falls. The information of the earthquake early warning includes information of “seismic area with seismic intensity 4 or higher” or “seismic area” that can estimate “strong earthquake area with seismic intensity 4 or higher”,
2. The receiver according to claim 1, wherein the warning unit issues a warning when the position information coincides with a “strong earthquake area having a seismic intensity of 4 or more”. The information of the earthquake early warning includes information of “latitude of the epicenter”, “longitude of the epicenter”, and “depth of the epicenter”,
Means for calculating the predicted arrival time of strong ground motion (main motion) to the area specified by the position information using the information;
The receiver according to claim 1, wherein the warning unit issues a warning by presenting the predicted arrival time. A timepiece comprising the receiver according to claim 1,
The postal code information is input using a time setting function including a time display function in the receiver-attached timepiece,
A receiver-attached timepiece, wherein the information on the earthquake early warning is displayed using the time display function.

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