JP2012182686A - Emergency broadcasting radio receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an emergency broadcasting radio receiver that reliably communicates an emergency broadcast by radio broadcasting and reliably prevents malfunctions.SOLUTION: The emergency broadcasting radio receiver includes: a signal processing section 12 for, if detecting a subsequent DTMF signal within a predetermined time of detection of a DTMF signal included in radio broadcast signals received by a reception section 13, saving the detected DTMF signals; a storage section 11 storing disaster information to be displayed in association with predetermined combinations of a plurality of DTMF signals; a determination section 101 for determining whether or not the plurality of detected DTMF signals are a predetermined combination; a display processing section 102 for displaying the corresponding disaster information on a liquid crystal display panel 3 and an LED indicator 4 if the DTMF signals are a predetermined combination; and an output processing section 103 for making an audio output from a speaker 2 if the DTMF signals are a predetermined combination.

Description

  The present invention relates to an emergency broadcast radio receiver capable of reporting emergency broadcasts related to disaster prevention or disasters.

  In Japan, natural disasters such as earthquakes, tsunamis, typhoons, and torrential rains occur every year. To prepare for such disasters, it is necessary to provide disaster prevention or disaster-related information to residents in the target area accurately and quickly. It has been requested.

  Provision of information related to disaster prevention or disaster is transmitted to residents in the target area through television broadcasting, radio broadcasting, and disaster prevention administrative radio, but the receiver is turned off at midnight. If this is the case, there is a problem that information is not transmitted and the response to the disaster is delayed. In addition, in the case of a disaster that occurs locally, such as torrential rain, providing information through wide-area broadcasting often causes highly urgent information to be provided to unrelated areas. There is a demerit that the response at the time when the residents' perception of information declines is delayed.

  For this reason, it has been proposed to provide disaster information using community FM broadcasts established in various places in Japan in recent years. For example, in Patent Document 1, a predetermined DTMF signal (Dual-Tone Multi-Frequency) is formed corresponding to the operation of a switch that is input when an emergency broadcast is performed, and is broadcast in an FM broadcast signal. It is described that when a predetermined DTMF signal included in the FM broadcast is detected in the broadcast receiver, the power is automatically turned on to output at a large volume. Further, in Patent Document 2, when at least one of a DTMF signal and an EWS signal indicating an emergency broadcast is included in an FM broadcast signal due to the occurrence of a disaster, the receiver is automatically turned on. The point that emergency broadcast messages are output at high volume is described.

Registered Utility Model No. 3118188 JP 2009-232247 A

  In the above-mentioned patent document, before broadcasting an emergency broadcast using FM broadcasting, a DTMF signal is flowed so that the FM broadcast receiver is automatically turned on and adjusted to be broadcast at a high volume. However, there is a problem that the contents of the emergency broadcast are only transmitted by voice through the broadcast, and may be missed, and cannot be directly transmitted to residents with hearing impairments.

  In addition, when an experiment was performed to broadcast an emergency broadcast by sending a specific DTMF signal to the FM broadcast, a malfunction of broadcasting the emergency broadcast at the FM broadcast receiver may occur even though the DTMF signal is not sent. It was. Analysis of the cause of such a malfunction confirmed that a signal similar to the DTMF signal exists in the signal received from the FM broadcast. If the emergency broadcast is broadcast erroneously, it causes social confusion and impairs the reliability of the emergency broadcast. Therefore, malfunctions must be avoided.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a highly reliable radio receiver for emergency broadcast that can reliably transmit emergency broadcast using radio broadcast and has no malfunction.

  An emergency broadcast radio receiver according to the present invention includes a reception unit that receives a radio broadcast signal, a display unit that displays disaster information related to the emergency broadcast, the received radio broadcast signal, and the emergency broadcast signal included in the radio broadcast signal An emergency broadcast radio receiver including an output unit for outputting sound based on the DTMF signal detected in the radio broadcast signal received by the receiver unit and detecting the DTMF signal and then detecting the next DTMF signal A signal processing unit for storing a detected DTMF signal when a signal is detected within a predetermined time; a storage unit for storing disaster information to be displayed in correspondence with a predetermined combination of a plurality of DTMF signals; A determination unit that determines whether or not a plurality of DTMF signals are a predetermined combination, and a case where it is determined that the DTMF signal is a predetermined combination, A display processing unit for displaying the disaster information on the display unit, DTMF signal and an output processing unit for performing audio output from the output unit when it is determined that the predetermined combination. Furthermore, the combination of DTMF signals used for determination when displaying disaster information is a combination of DTMF signals that are low in frequency of occurrence and different from each other in radio broadcast signals. Further, the display processing unit stops the display on the display unit when the determination unit determines that the DTMF signal is a specific combination. Further, the signal processing unit stores the DTMF signal detected when the next DTMF signal is detected within 10 seconds. The display processing unit further includes a setting unit configured to set region information. The display processing unit displays the region information on the display unit based on the set region information, and combines DTMF signals related to the region information. Display the corresponding information.

  The present invention has the above-described configuration, so that the DTMF signal detected when the next DTMF signal is detected within a predetermined time after the DTMF signal included in the radio broadcast signal is detected, and the emergency broadcast is saved. Since it is determined whether it is a combination of signals, the emergency broadcast can be reliably transmitted without causing malfunction.

  In addition, since information on emergency broadcasts is displayed in correspondence with a predetermined combination of a plurality of DTMF signals, the contents of the emergency broadcasts can be visually recognized by the information displayed on the display unit even when the emergency broadcast is missed. Disaster information can be transmitted quickly and reliably. In addition, since residents with hearing impairments can check the contents of emergency broadcasts, it is possible to respond without delay even when evacuation is necessary.

It is an external appearance perspective view regarding embodiment which concerns on this invention. It is a block block diagram regarding the control processing of the radio receiver for emergency broadcasts. It is a table | surface which shows the correspondence of the combination of a DTMF signal, and a display character. It is a table | surface which shows the combination of the frequency regarding a DTMF signal. It is explanatory drawing regarding the display state which shows the content of emergency broadcast. It is a pie chart which shows the detection result of the DTMF signal contained in FM broadcast signal and AM broadcast signal. It is a list | wrist which shows the result of having analyzed the detection interval of the DTMF similar signal. It is a processing flow regarding the detection process of a DTMF signal. It is a processing flow regarding interrupt processing. It is a processing flow regarding emergency broadcast processing. It is a table | surface which shows the correspondence of the combination of a DTMF signal, and LED display.

  Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings. FIG. 1 is an external perspective view of an embodiment according to the present invention. A portable emergency broadcast radio receiver 1 includes a speaker 2 that outputs sound on the front surface, a display of settings such as time and frequency, a liquid crystal display panel 3 that displays the content of emergency broadcasts, and a plurality of different colors. An LED display 4 that includes an LED element and displays the content of emergency broadcast in the color of light, and a siren 5 that notifies that there is an emergency broadcast are provided. The emergency broadcast radio receiver 1 is provided with an AM broadcast or FM broadcast dial tuning knob 6 and a volume adjusting knob 7 on the side, and an LED light 8 for illumination and a handwheel on the side. A manual generator 9 with a handle is provided.

  Although not shown in the figure, an outlet for connecting to a commercial power source, a power cord, and a plug for charging a mobile phone are accommodated on the back of the emergency broadcast radio receiver 1. Moreover, the emergency broadcast radio receiver 1 has a built-in storage battery, and the storage battery is charged when a commercial power source is connected or when the generator 9 generates power.

  Since the emergency broadcast radio receiver 1 has such a configuration, the dial selection knob 6 and the volume adjustment knob 7 are operated as a normal radio receiver when used in a house. In the event of a disaster, emergency broadcasts can be received and their contents transmitted reliably, and when evacuated, they can be taken out and listen to emergency broadcasts at the evacuation center. In the case of power outage or outdoor use, it can be used continuously while charging the storage battery with a power generator, and can also be used for charging a mobile phone.

  FIG. 2 is a block configuration diagram relating to control processing of the emergency broadcast radio receiver 1. The control unit 10 performs overall control processing related to emergency broadcasting, determines a combination of the detected DTMF signals, and determines the combination of the liquid crystal display panel 3 and the LED display 4 based on the determined combination of DTMF signals. A display processing unit 102 that performs display control and an output processing unit 103 that controls audio output of the speaker 2 and output of the siren 5 based on detection of the DTMF signal are provided.

  The storage unit 11 stores a table of character information corresponding to combinations of four DTMF signals. In this example, as shown in FIG. 3, the area name displayed on the first line of the liquid crystal display panel 3, the disaster information displayed on the second line, and the LED display corresponding to the combination of the four detected DTMF signals. The display elements L1 to L4 of the device 4 are stored. The area name to be displayed is determined according to the data set by the setting unit 15.

  The signal processing unit 12 detects the DTMF signal included in the reception signal from the reception unit 13 that receives the radio broadcast signal, and detects the DTMF signal detected when the next DTMF signal is detected within a predetermined time after the DTMF signal is detected. Save. When four DTMF signals are stored, the combination data is transmitted to the control unit 10. As shown in FIG. 4, the DTMF signal is defined by two combinations according to the recommendation of CCITT (International Telegraph and Telephone Consultative Committee), and is composed of four frequencies in the voice band corresponding to the push button of the telephone. Two frequencies respectively selected from the high group and the low group are combined to form one DTMF signal. The DTMF signal is given a total of 16 types of codes including numbers from 0 to 9 and symbols of *, #, and A to D corresponding to combinations of four types of frequencies of the high group and the low group. Yes. By combining a plurality of such DTMF signals, a large number of individually identifiable signals can be created. When the DTMF signal is stored in the signal processing unit 12, it may be converted into a corresponding code and stored.

  The receiving unit 13 can be set to any one of an AM mode for receiving an AM broadcast, an FM mode for receiving an FM broadcast, or an OFF mode set to a specific frequency for broadcasting an emergency broadcast. When the emergency broadcast radio receiver 1 is turned on, the dial tuning knob 6 receives a normal radio broadcast signal selected in the AM mode or FM mode. However, the emergency broadcast radio receiver 1 is turned off when the power is turned off. It is set to receive a radio broadcast signal of a specific frequency in the mode. Here, the radio broadcast signal of a specific frequency may be either AM broadcast or FM broadcast.

  The connection circuit 14 is provided between the receiving unit 13 and the speaker 2, and outputs or stops outputting the radio broadcast signal received by the receiving unit 13 based on a control signal from the output processing unit 103.

  The setting unit 15 sets a region where the emergency broadcast radio receiver 1 is used. For example, it may be set using an element that can manually set a plurality of setting data such as a dip switch. In this example, as shown in FIG. 3, the setting data S1 is set when used in the region A, the setting data S2 is set when used in the region B, and the setting data is set when used in the region C. Set to data S3.

  The determination unit 101 determines whether or not the combination of the four DTMF signals transmitted from the signal processing unit 12 is a combination of DTMF signals corresponding to the setting data set by the setting unit 15, and the DTMF corresponding to the setting data. In the case of a predetermined combination of signals, the display processing unit 102 and the output processing unit 103 are controlled based on the combination data.

  For example, as illustrated in FIG. 3, when the setting data of the setting unit 15 is S1, it is determined that the combination of DTMF signals transmitted from the signal processing unit 12 corresponds to any one of 1015, 1016, 1017, or 1018. Sometimes display processing of the liquid crystal display panel 3 is performed. For example, when the combination of the DTMF signals is 1015, as shown in FIG. 5, “Chiiki A” and “Ooame” are displayed on the liquid crystal display panel 3, and the display element L1 of the LED display 4 is turned on. Control display. The display elements L <b> 1 to L <b> 4 have LEDs that emit colors such as blue, yellow, green, and white, and different colors are lit corresponding to the disaster information displayed on the liquid crystal display panel 3.

  When the output processing unit 103 determines that the combination of the DTMF signals is a combination corresponding to the setting data of the setting unit 15, the output processing unit 103 sets the connection circuit 14 in the connected state and the receiving unit 13 is in the AM mode or the FM mode. Is switched to receive a broadcast at a specific frequency for broadcasting an emergency broadcast, and the emergency broadcast is automatically output from the speaker 2. Further, control is performed so that the siren 5 is turned on and siren sound is output.

  Also, as shown in FIG. 3, when it is determined that the combination of the received DTMF signals is a specific combination such as 0000, the display processing unit 102 stops displaying the disaster information and the output processing unit 103 5 is stopped, and sound is output by normal radio broadcasting.

  When the above-described four combinations of DTMF signals are set, it is necessary to avoid malfunction caused by a signal similar to a DTMF signal included in a normal radio broadcast signal (hereinafter referred to as “DTMF similar signal”). According to the investigation by the present inventors, it has been found that a signal corresponding to a human voice included in a radio broadcast signal is often similar to a DTMF signal, and therefore a DTMF similar signal is frequently detected. FIG. 6 is a pie chart showing the result of detecting a DTMF signal while receiving FM broadcast signals and AM broadcast signals over 23 days. 6A shows the detection result in the FM broadcast signal, and FIG. 6B shows the detection result in the AM broadcast signal. In the pie chart, the ratio of each code in the number of detected DTMF similar signals is displayed. According to the results of the investigation, the detected DTMF signal varied depending on the sign, the expression frequency was high at 18.5%, and the low one was 0.3%. In addition, there was not much difference in the frequency of occurrence depending on the content and type of broadcast, and there was not much difference depending on the day of the week.

  Therefore, a malfunction caused by a DTMF-like signal can be avoided by combining DTMF signals with a low frequency of occurrence in normal radio broadcast signals. For example, according to the above-described survey results, the frequency of combination of “D370” may cause malfunction once in about 519 in consideration of the number of receptions per day. By using a low-combination DTMF signal as the emergency broadcast start signal, it is possible to substantially eliminate malfunctions caused by DTMF-like signals.

  Moreover, the result of having analyzed the detection interval of the DTMF similar signal in the investigation result mentioned above is shown in FIG. In the list shown in FIG. 7, the elapsed time (seconds) from the detection of one DTMF similar signal to the detection of the next DTMF similar signal is shown for each detection signal. According to this analysis result, the detection interval of the DTMF-like signal is about 2 minutes on average, but the detection interval is short when the same detection signal is continuously detected, and the detection interval when the detection signals are different. The tendency to become longer can be read. Therefore, in the combination of DTMF signals, different DTMF signals are set in combination, and an emergency broadcast start signal is created at an interval at which the next DTMF signal is detected within a predetermined time (for example, within 10 seconds), together with the radio broadcast signal. Broadcasting can reliably avoid malfunctions caused by DTMF-like signals.

  When the emergency broadcast radio receiver described above is used, first, when the emergency broadcast is notified by the disaster prevention administrative radio in the administrative agency, voice information, regional information and disaster information related to the emergency broadcast are transmitted via the dedicated line. Sent to a broadcast station. When receiving information related to emergency broadcasting, the radio broadcasting station creates a combination of the above-described plurality of DTMF signals based on regional information and disaster information related to emergency broadcasting. Then, using the created DTMF signal as an emergency broadcast start signal, and using a DTMF signal composed of a specific combination (for example, 0000) as an emergency broadcast stop signal, the emergency broadcast audio is transmitted between the emergency broadcast start signal and the emergency broadcast stop signal. A series of emergency broadcast signals into which information has been inserted is created and incorporated into a radio broadcast signal of either normal AM broadcast or FM broadcast by interruption processing and broadcast.

  FIG. 8 is a processing flow relating to detection processing of a DTMF signal broadcast as an emergency broadcast signal. First, in order to receive an emergency broadcast signal, an initial setting for inputting setting data of a use region and the like is performed (S100), and an interrupt processing timing for detection is set (S101). The timing of interrupt processing may be set so that interrupt processing is performed at detection intervals such as 0.125 seconds, 0.25 seconds, 0.5 seconds, and 1 second, for example. By counting the number of interrupt processes, the detection interval can be set to a predetermined time, and it is possible to determine whether or not a DTMF signal has been detected within the predetermined time.

  After setting the interrupt processing, it is checked whether a DTMF signal serving as an emergency broadcast start signal has been transmitted (S102). If transmission of a DTMF signal is detected (S102-YES), the number of inputs DTMF signal N is less than 4. Is checked (S103). When transmission of the DTMF signal is not detected (S102-NO), the presence / absence of repeated transmission is detected. If the number N of inputs is less than 4 (S103-YES), the detected DTMF signal is stored (S104), and the count is incremented by adding 1 to the number N of inputs (S105). Then, the interrupt count W is reset (S106), and it is checked whether timeout is permitted (S107). If the timeout is not permitted (S107-NO), the process returns to step S102 to check whether there is a DTMF signal transmission.

  If the timeout is permitted in step S107 (S107-YES), the process proceeds to an emergency broadcast process described later. Further, when the number N of inputs is 4 or more in step S103 (S103-NO), the process proceeds to the emergency broadcast process. When the emergency broadcast process described later is completed, the number N of inputs is reset (S108), and the process returns to step S102 to check whether there is a DTMF signal transmission.

  FIG. 9 is a processing flow relating to interrupt processing. First, an interrupt process is performed at the set timing (S200), and the detection process shown in FIG. 8 is performed. When the interrupt process is performed, a count-up is performed by adding 1 to the interrupt count W. (S201). Then, it is checked whether or not the interrupt count W is equal to or greater than the predetermined count T (S202). If the interrupt count W is equal to or greater than the predetermined count (S202-YES), a setting is made to allow timeout (S203), and the process ends. If the interrupt count W is smaller than the predetermined count T in step S202, the process is terminated without setting for permitting timeout.

  By performing the above processing, the DTMF signal is detected every time the interrupt processing is performed, and when the DTMF signal is detected, the DTMF signal is stored, and the number of inputs N is 4 or more-that is, four When the DTMF signal is stored, the emergency broadcast processing is started. When the interrupt count W is equal to or greater than the predetermined count T between the detection of the DTMF signal and the detection of the next DTMF signal, the time set by the interrupt processing setting timing and the predetermined count T It is set so that a timeout is permitted, assuming that no DTMF signal is detected. When the time-out permission is set, the emergency broadcast process is advanced with an incomplete combination of DTMF signals, and the process ends without performing the emergency broadcast process because it does not match the set data. In this way, only the combination of DTMF signals broadcast as emergency broadcast signals can be reliably detected.

  FIG. 10 is a processing flow related to emergency broadcast processing. First, it is checked whether or not there is a stored DTMF signal in the above-described detection process (S300), and if there is no stored DTMF signal (S300-NO), the process ends. If there is a stored DTMF signal (S300-YES), the setting data relating to the initial use region is read (S301), and the combination of the stored DTMF signals is the combination of the DTMF signals corresponding to the setting data. It is checked whether or not there is (S302). If it is a combination that does not correspond to the setting data (S302-NO), it is an emergency broadcast related to an area different from the use area, so the process is terminated without performing the subsequent emergency broadcast processing.

  If it is a combination corresponding to the setting data (S302-YES), a character display process and an LED display process corresponding to the combination are performed (S303). In the character display process, the area name corresponding to the setting data and the disaster information corresponding to the emergency broadcast are read and displayed on the liquid crystal display panel 3. In the LED display process, the display element of the LED display 4 corresponding to the detected combination is turned on.

  At the same time, output processing of the siren 5 is performed to generate a siren sound (S304). Then, it is checked whether or not the power of the radio receiver is turned on (S305). If the power is turned on, a channel selection process is performed so as to automatically switch to a broadcast of a specific frequency through which an emergency broadcast flows ( S306). When the power is off, the station is pre-selected for the specific frequency broadcast in which the emergency broadcast flows in the OFF mode, so that the emergency broadcast can be reliably output by performing the sound output processing of the speaker (S307). Can do. At that time, since the character display on the liquid crystal display panel 3 and the lighting process of the LED display 4 are performed, the contents of the emergency broadcast can be transmitted visually and auditorily. In addition, it is possible to notify the residents who are away by issuing a siren sound that there is an emergency broadcast, and to reliably transmit the contents.

  Next, it is checked whether a DTMF signal serving as an emergency broadcast stop signal has been transmitted (S308), and a plurality of DTMF signals detected when transmission of a plurality of DTMF signals is detected are stopped signals registered in the storage unit 11 It is checked whether or not it matches the specific combination indicating (S309). In this example, when a DTMF signal having a combination of 0000 is detected, the character display on the liquid crystal display panel 3 is not displayed, and the display element lit on the LED display 4 is turned off (S310). Moreover, the output process of the siren 5 is stopped, the siren sound is stopped (S311), and the emergency broadcast process is terminated.

  In this case, the character display process and the LED display process may remain displayed. Further, a stop button for manually stopping the siren sound may be provided. It should be noted that the audio output process of the speaker is continued as it is to alert the user to prepare for the next emergency broadcast.

  In the example described above, the LED display 4 using the liquid crystal display panel 3 and a plurality of display elements is used. However, display processing is performed using two LED displays capable of emitting a plurality of colors. It may be. For example, as shown in FIG. 11, one of two LED indicators is used for identifying regional information, and the other is used for identifying disaster information, so that the contents of emergency broadcasts can be visually accurately identified. Can be communicated to. In this example, display control is performed on one LED display so that red light is emitted in the region A, green light is emitted in the region B, and blue light is emitted in the region C. The other LED display is controlled to emit light in blue in heavy rain, yellow in strong wind, green in earthquake, and white in other disasters.

  Such disaster information and regional information can be set in detail by combining DTMF signals, and may be set as necessary according to disaster prevention measures for each region.

1 Radio receiver for emergency broadcast 2 Speaker 3 Liquid crystal display panel 4 LED display 5 Siren
10 Control unit

Claims (5)

  A reception unit that receives a radio broadcast signal, a display unit that displays disaster information related to emergency broadcast, and an output unit that outputs audio based on the received radio broadcast signal and the emergency broadcast signal included in the radio broadcast signal An emergency broadcast radio receiver that detects a DTMF signal included in a radio broadcast signal received by the receiver and detects the next DTMF signal within a predetermined time after detecting the DTMF signal. Whether the detected signal processing unit for storing the DTMF signal, the storage unit for storing the disaster information to be displayed corresponding to the predetermined combination of the plurality of DTMF signals, and the plurality of stored DTMF signals are the predetermined combination A determination unit for determining whether or not the display unit displays disaster information corresponding to the combination when the DTMF signal is determined to be a predetermined combination. Parts and emergency broadcast radio receiver and an output processing unit for performing audio output from the output unit when a DTMF signal is determined to be the predetermined combination.   The radio receiver for emergency broadcasting according to claim 1, wherein a combination of DTMF signals used for determination when displaying disaster information is a combination of DTMF signals having low occurrence frequency and different from each other in radio broadcasting signals.   The emergency broadcast radio receiver according to claim 1, wherein the display processing unit stops the display on the display unit when the determination unit determines that the DTMF signal is a specific combination.   4. The emergency broadcast radio receiver according to claim 1, wherein the signal processing unit stores the detected DTMF signal when the next DTMF signal is detected within 10 seconds.   A setting unit configured to set area information; and the display processing unit displays the area information on the display unit based on the set area information and supports a combination of DTMF signals related to the area information. The radio receiver for emergency broadcasting according to any one of claims 1 to 4, which displays information.

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