JP4757212B2 - Earthquake early warning system - Google Patents

Description

  The present invention relates to an emergency earthquake warning system that predicts an earthquake arrival time and seismic intensity based on an emergency earthquake warning from the Japan Meteorological Agency and distributes the information to each terminal before the arrival of the main motion of the earthquake.

  IP transmission type information as an emergency earthquake warning system that predicts the arrival time and seismic intensity of earthquakes from the earthquake early warning published by the Japan Meteorological Agency, and distributes the predicted arrival time and seismic intensity information to each terminal before the arrival of the earthquake A distribution system and an information distribution system using a broadcast method using a CATV network are known.

  Here, the emergency earthquake bulletin informs the information about the occurrence time, the epicenter, and the scale of the earthquake predicted from the observation of the P wave before the arrival of the S wave (the main motion of the earthquake). Usually, the time from the announcement of the earthquake early warning to the actual arrival of the S wave is several seconds to several tens of seconds.

  In the case of the IP transmission type, the server that has received the earthquake early warning retransmits the earthquake early warning to each receiving terminal device by the IP method. In the receiving terminal device, the arrival time and seismic intensity are calculated and predicted from the received emergency earthquake bulletin, and voiced or the like is performed.

In the case of the broadcast method using the CATV network shown in Non-Patent Document 1, the center device receives the earthquake early warning, calculates the arrival time and seismic intensity from the received earthquake early warning, and predicts. Then, the center device distributes the arrival time and seismic intensity prediction information to each receiving terminal device by the broadcast method. In the receiving terminal device, the received arrival time and seismic intensity prediction information are voiced.
“Completion of“ CATV Broadcast Emergency Earthquake Early Warning Data Distribution System ”Prototype and Start of Demonstration Experiment” Japan Electronics and Information Technology Industries Association July 26, 2006

  However, in the case of the IP transmission type, a congestion delay in the network or a delay due to unicast occurs, so that it takes a long time to start up the receiving terminal device. Therefore, there is a high possibility that earthquake prediction information will be broadcast after the main movement of the earthquake.

  Further, in the method of Non-Patent Document 1, since the receiving terminal device has an audio unit, processing at the receiving terminal device becomes heavy, and there is a problem in terms of cost. Furthermore, since the receiving terminal device has an audio unit, it cannot be diverted to other uses.

  Therefore, an object of the present invention is to realize an emergency earthquake warning system that can be constructed at low cost without delay of information due to arithmetic processing or the like.

A first invention is an emergency earthquake warning system that calculates earthquake prediction information based on an emergency earthquake warning and distributes the earthquake prediction information to each terminal via a transmission line. The center unit is configured to receive an earthquake early warning and calculate earthquake prediction information, voice processing means for converting the earthquake prediction information into an audio signal, and within a predetermined band. Modulation means for modulating the first carrier wave with an audio signal, control signal generation means for generating a control signal based on earthquake prediction information, and modulating a second carrier wave in a predetermined band different from the first carrier wave with the control signal, Transmitting means for transmitting the modulated first carrier wave and second carrier wave to the receiving terminal device via a transmission line, and the receiving terminal device transmits a signal obtained by modulating the first carrier wave with an audio signal to the transmission line. Received via Sound signal receiving means for obtaining a sound signal, control signal receiving means for obtaining a control signal by receiving a signal obtained by modulating a second carrier wave with a control signal, and earthquake prediction information based on the sound signal based on the control signal Broadcast control means for performing the broadcast control, and the receiving terminal device is grouped for each of a plurality of areas, the arithmetic processing means calculates earthquake prediction information for each area, Each earthquake prediction information is converted into each audio signal, the modulation means modulates a plurality of first carriers in different bands within a predetermined band with each audio signal, and the audio signal receiving means A signal obtained by modulating the first carrier wave corresponding to the area to which the signal belongs with the audio signal is received via the transmission line to obtain the audio signal, the arithmetic processing means calculates the priority of each area, and the transmission means First carrier modulated in the order of Sending a wave, it is an earthquake early warning system, characterized in that.

  Here, the earthquake prediction information is information such as arrival time and seismic intensity predicted from emergency earthquake bulletin (information about earthquake occurrence time, epicenter, and scale). The transmission line is a CATV cable or an optical cable. In addition, the control signal includes information for controlling the broadcast such as the start, end, recording and volume of the earthquake prediction information, information for updating data such as the address and group ID of the receiving terminal device, and earthquake prediction. It is a signal including text data of information.

  The predetermined band is usually a band of 70 to 90 MHz, but may be any other band.

  The audio signal and the control signal are put on the first carrier and the second carrier, which are in different predetermined bands, respectively, and demodulated by the audio signal receiving unit and the control signal receiving unit which are different receiving units in the receiving terminal device, Received. The audio signal receiving means is means for performing demodulation and channel selection of the audio signal, and the control signal receiving means is means for performing demodulation and channel selection of the control signal.

  The modulation method of the first carrier is usually frequency modulation. As the modulation method of the second carrier wave, the FSK method, the PSK method, or the like may be used, and the first carrier wave and the second carrier wave may be the same modulation method.

  The priority is determined in consideration of, for example, the arrival direction of the earthquake and the difference in the ground condition for each area.

The second invention is Oite the first inventions, the control signal includes a text data of earthquake prediction information, the receiving terminal apparatus, the earthquake early warning, characterized in that it comprises a display device for displaying the text data System.

  According to the first invention, the first carrier wave for transmitting the sound signal carrying the earthquake prediction information and the second carrier wave for transmitting the control signal are set to different frequency bands. By separating the audio signal receiving means and the control signal receiving means, it is possible to greatly shorten the time until the broadcast for transmitting the earthquake prediction information is started.

  In addition, since the emergency earthquake warning system of the present invention can be constructed using a conventional notification broadcasting system, an emergency earthquake warning system can be constructed at a low cost, and earthquake prediction information is broadcast as one of the notification broadcasts. be able to. Therefore, it is possible to link disaster prevention information, disaster information, and earthquake prediction information by notification broadcasting. In addition, since the receiving terminal device does not have an arithmetic processing unit and an audio unit, the cost can be reduced and it can be easily used as an FM radio broadcast receiver.

In addition, by using a plurality of first carriers in different bands, it is possible to distribute different earthquake prediction information for each of a plurality of areas to the receiving terminal device. Therefore, it is possible to further improve the prediction accuracy of the earthquake arrival time and seismic intensity.

Furthermore, by setting a priority for each area, earthquake prediction information can be calculated and distributed in order from the area with the highest priority. For example, earthquake prediction information can be distributed in order from an area where the earthquake is scheduled to arrive early. In addition, by reorganizing areas that are predicted to arrive at the same time among the plurality of calculated areas in accordance with the arrival direction of the earthquake, it is possible to operate with a first carrier smaller than the actual number of areas.

According to the second aspect of the invention, the text data of the earthquake prediction information is included in the control signal, and the apparatus for displaying the text data on the receiving terminal device is provided, so that the earthquake prediction information is transmitted visually as well as voice. Can do.

  Hereinafter, specific examples of the present invention will be described with reference to the drawings. However, the present invention is not limited to these examples.

  FIG. 1 is a block diagram showing the configuration of the center device 1 used in the emergency earthquake warning system of the present invention, and FIG. 2 is a block diagram showing the configuration of the receiving terminal device 2 used in the emergency earthquake warning system. These are figures which show the outline of a structure of the earthquake early warning system of this invention.

  First, the configuration of the earthquake early warning system will be described. As shown in FIG. 3, the earthquake early warning system includes a center device 1 and a plurality of receiving terminal devices 2. The center device 1 and the receiving terminal device 2 are connected via a CATV cable. The receiving terminal devices 2 are grouped into areas A, B, and C according to their installation locations.

  Next, the configuration of the center apparatus 1 will be described with reference to FIG. The center device 1 includes an arithmetic processing unit 10, an audio unit 11, notification broadcast server software 12, a priority processing unit 13, FM modulators 14 a, b, c, an FSK transmitter 15, and a mixer 16. The arithmetic processing means 10 is connected to the Meteorological Agency server, the sounding means 11, and the notification broadcast server software 12, and receives the earthquake early warning from the Meteorological Agency server. The sounding means 11 is connected to the priority processing means 13, and the priority processing means 13 is connected to the FM modulators 14a, 14b, and 14c, respectively. The notification broadcast server software 12 is connected to the FSK transmitter 15. The FM modulators 14a, b, c, and FSK transmitter 15 are connected to the mixer 16, and a signal output from the mixer 16 is transmitted to each receiving terminal device 2 via a CATV cable.

  The FM modulators 14a, 14b, and 14c correspond to the modulation means of the present invention, and the notification broadcast server software 12 and the FSK transmitter 15 correspond to the control signal generation means of the present invention.

  The center device 1 of the present invention is the same as the conventional notification broadcasting center device except for the arithmetic processing means 10, the sounding means 11, and the priority processing means 13, and is constructed by diverting the notification broadcasting center device. can do.

  Next, the configuration of the receiving terminal device 2 will be described with reference to FIG. The receiving terminal device 2 has a CPU 20 (broadcast control means of the present invention). The CPU 20 is connected to the tuner 21 (corresponding to the audio signal receiving means of the present invention), the tuner 22 (corresponding to the control signal receiving means of the present invention), the reproduction unit 24, and the volume control unit 25, and controls them. ing. In addition, the CPU 20 is connected to the nonvolatile memory 27, reads data from the nonvolatile memory 27, and writes data to the nonvolatile memory 27. The nonvolatile memory 27 stores the terminal ID, group ID, and the like of the receiving terminal device 2. The group ID identifies whether the receiving terminal device 2 belongs to areas A, B, or C. A signal input from the CATV cable is input to tuners 21 and 22 through a BPF (band pass filter) 23. The BPF 23 is a filter that passes only signals in the FM frequency band. The tuner 21 is connected to the playback unit 24, the playback unit 24 is connected to the volume control unit 25, and the volume control unit 25 is connected to the speaker 26. The tuner 22 is connected to the CPU 20. Further, the CPU 20 is connected to a display device 28 for displaying characters.

  Next, the operation of the earthquake early warning system will be described. When an earthquake early warning is announced from the Japan Meteorological Agency, the earthquake early warning is input to the arithmetic processing means 10 of the center apparatus 1 from the Meteorological Agency server or via another server. The calculation processing means 10 sets broadcast priorities for the areas A, B, and C based on the earthquake arrival direction, etc., and calculates earthquake prediction information for each of the areas A, B, and C in the order of the priorities. The result is input to the sounding means 11 and the notification broadcast server software 12. The earthquake prediction information is information such as predicted arrival time, seismic intensity, etc., taking into account the distance from the epicenter of the earthquake to each area A, B, C, the ground condition of each area A, B, C, etc. It is determined. Since earthquake prediction information is calculated for each area, it is possible to predict arrival time and seismic intensity more accurately.

  The calculation of earthquake prediction information in the calculation processing means 10 will be described in more detail.

The earthquake early warning is information on the position (latitude, longitude, depth) of the epicenter predicted from the observation of the P wave, the magnitude (magnitude) of the earthquake, and the occurrence time. First, the arithmetic processing means 10 calculates the distance to each area A, B, C from the latitude and longitude of the epicenter and the latitude and longitude of each area A, B, C. Specifically, if the position of the epicenter (X, Y) and the position of the area A (Xa, Ya), the distance La from the epicenter to the area A is La = ((X−Xa) ² + (Y -Ya) ² ) determined as ^1/2 . More precisely, the distance is obtained by spherical trigonometry or the like. Next, the arrival time of the S wave in each area A, B, C is calculated from the occurrence time of the earthquake and the velocity of the S wave. The speed of the S wave is predicted in consideration of the ground condition and the like. If the arrival time of the earthquake is T and the velocity of the S wave considering the ground condition in the area A is Vs, the time Ta at which the S wave reaches the area A is obtained by Ta = T + La / Vs. The first carrier wave having a frequency unique to each area A, B, C is calculated in the order of arrival time of each area A, B, C calculated in this way, using earthquake prediction information unique to each area A, B, C. It modulates and distributes to the receiving terminal apparatus 2 of each area A, B, and C.

  In addition, when the priorities of the areas A, B, and C are equal, it is not necessary to calculate the earthquake prediction information for each area, and if the earthquake prediction information common to the entire areas of the areas A, B, and C is calculated. Good.

  Next, the sounding means 11 converts the earthquake prediction information of each area A, B, C into sound signals, and the sound signals are input to the priority processing means 13.

  The priority processing means 13 inputs the audio signal of area A to the FM modulator 14a, the audio signal of area B to the FM modulator 14b, and the audio signal of area C to the FM modulator 14c.

  The FM modulator 14a frequency-modulates the first carrier wave in the FM frequency band (70 to 90 MHz) with the audio signal of area A, and the FM modulator 14b differs from the frequency of the first carrier wave used in the FM modulator 14a. The frequency of the first carrier wave in the FM frequency band is frequency-modulated with the audio signal of area B, and the FM modulator 14c uses the frequency of the first carrier wave used in the FM modulator 14a and the first carrier wave used in the FM modulator 14b. The first carrier wave in the FM frequency band, which is different from the frequency of one carrier wave, is frequency-modulated with an audio signal in area C. These frequency-modulated first carriers are input to the mixer 16.

  On the other hand, when earthquake prediction information is input to the notification broadcast server software 12, a control signal is generated based on the earthquake prediction information. The control signal is a signal including information for controlling the start, end, volume, etc. of the sound broadcast of the earthquake prediction information in the receiving terminal device 2 and text data of the earthquake prediction information. A control signal output from the notification broadcast server software 12 is input to the FSK transmitter 15.

  In the FSK transmitter 15, the second carrier wave having a frequency different from that of the first carrier wave is FSK modulated with the control signal, and the modulated second carrier wave is input to the mixer 16.

  In the mixer 16, the modulated first carrier wave output from the FM modulators 14 a, b, c is mixed with the modulated second carrier wave output from the FSK transmitter 15, and each is mixed via the CATV cable. It is transmitted to the receiving terminal device 2 in the area.

  As for the signal sent from the center apparatus 1 to the receiving terminal apparatus 2 via the CATV cable, only the signal in the FM frequency band passes through the BPF 23 and is input to the tuners 21 and 22.

  The CPU 20 controls the tuner 22 so as to select the frequency of the second carrier wave. The control signal is demodulated by the tuner 22 and input to the CPU 20. The CPU 20 controls the tuner 21 so as to select the frequency of the first carrier wave set in advance by the area based on the information indicating that the sound broadcast of the earthquake prediction information included in the control signal is started. Then, the sound signal of the earthquake prediction information is demodulated, and the sound signal is input to the reproduction unit 24, and the sound of the earthquake prediction information of the area to which the receiving terminal device 2 belongs is output from the speaker 26. Further, the CPU 20 controls the volume control unit 25 to set the volume to an appropriate value.

  Since the earthquake prediction information is calculated in the order of priority of each area, the audio signal is output in the order of priority of each area, and the broadcast of the earthquake prediction information is started in the order of priority of each area.

  The text data of the earthquake prediction information included in the control signal is input from the CPU 20 to the display device 28, and earthquake prediction information such as the earthquake arrival time and seismic intensity is visually displayed on the display device 28.

  As described above, in the earthquake early warning system of the present invention, different earthquake prediction information can be distributed for each area A, B, C, and the earthquake prediction information is sorted in the order of priority of each area A, B, C. You can broadcast. Separately, the carrier wave carrying the control signal and the carrier wave carrying the earthquake signal of the earthquake prediction information are separately received and demodulated. It is possible to shorten the time until the broadcast starts.

  In addition, since the receiving terminal device 2 does not have an arithmetic processing unit and an audio unit, the cost can be reduced and the diversion to an FM radio broadcast receiver or the like is easy. Furthermore, since the center device 1 can be configured using a conventional notification broadcasting center device, the emergency earthquake warning system of the present invention can be constructed at low cost, and notification that conveys disaster information, disaster prevention information, etc. It is also possible to link with a broadcasting system.

  In the first embodiment, a CATV cable is used, but an emergency earthquake warning system may be configured using an optical cable or the like instead of the CATV cable. Further, the modulation method of the second carrier wave may be a signal modulated by a method other than the FSK method. Moreover, although the band of the first carrier wave is 70 to 90 MHz, it may be within another predetermined band.

  According to the present invention, it is possible to construct an inexpensive earthquake early warning system in which the receiving terminal device is activated quickly.

The figure which shows the structure of the center apparatus used for the earthquake early warning system of this invention. The figure which shows the structure of the receiving terminal device used for the earthquake early warning system of this invention. The figure which shows the structure of the earthquake early warning system of this invention.

1: Center device 2: Receiving terminal device 10: Arithmetic processing means 11: Sounding means 12: Notification broadcast server software 13: Priority processing means 14a, b, c: FM modulator 15: FSK transmitter 16: Mixer 20 : CPU
21, 22: Tuner 24: Playback unit 25: Volume control unit 26: Speaker 27: Non-volatile memory 28: Display device

Claims (2)

In the earthquake early warning system that calculates earthquake prediction information based on the earthquake early warning and distributes the earthquake prediction information to each terminal via a transmission line,
The earthquake early warning system is composed of a center device and a plurality of receiving terminal devices,
The center device is
Arithmetic processing means for receiving the earthquake early warning and calculating earthquake prediction information;
An audio means for converting the earthquake prediction information into an audio signal;
Modulation means for modulating a first carrier wave within a predetermined band with the audio signal;
A control signal generating means for generating a control signal based on the earthquake prediction information and modulating a second carrier wave in a predetermined band different from the first carrier wave by the control signal;
Transmitting means for transmitting the modulated first carrier wave and second carrier wave to a receiving terminal device via a transmission line;
The receiving terminal device
Audio signal receiving means for receiving the signal obtained by modulating the first carrier wave with the audio signal via the transmission line and obtaining the audio signal;
Control signal receiving means for receiving the signal obtained by modulating the second carrier wave with the control signal via the transmission line and obtaining the control signal;
Broadcast control means for performing broadcast control of the earthquake prediction information by the audio signal based on the control signal,
The receiving terminal devices are grouped into a plurality of areas,
The arithmetic processing means calculates the earthquake prediction information for each area,
The voice means converts each earthquake prediction information into each voice signal,
The modulating means modulates a plurality of first carriers in different bands within a predetermined band with each of the audio signals,
The audio signal receiving means receives the signal obtained by modulating the first carrier wave corresponding to the area to which the audio signal belongs with the audio signal via the transmission line to obtain the audio signal,
The arithmetic processing means calculates the priority of each area,
The transmission means transmits the first carrier wave modulated in the order of the priorities.
Earthquake early warning system characterized by that. The control signal includes text data of the earthquake prediction information,
The earthquake early warning system according to claim 1, wherein the receiving terminal device includes a display device that displays the text data.

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