JPH0415647B2 - - Google Patents

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to an emergency warning broadcast receiving device, and more particularly to a device for receiving an emergency warning signal broadcast by interrupting the audio of television broadcast or radio broadcast when an emergency situation occurs. BACKGROUND ART In order to reduce disasters when an emergency situation such as an earthquake occurs, an emergency warning broadcast is performed to notify people of the emergency situation. For emergency warning signals, television broadcasts, radio broadcasts, and most other broadcasts are used as broadcast media. This emergency warning signal is inserted by interrupting the audio signal of the broadcast number, and the digital code signal is modulated using frequency shift keying (FSK) using frequencies in the audible range. The emergency alert signal includes a starting signal as shown in FIG. 2 containing a block of symbols as shown in FIG.
It includes a subsequent warning sound, an end signal as shown in FIG. 3, and a test signal identical to the end signal. The start signal notifies the start of the emergency warning broadcast. The end signal notifies the end of the emergency warning broadcast. As is clear from FIG. 2, the start signal is composed of continuous transmission of code blocks in units of 1.5 seconds. Termination signal and test signal are
As is clear from Figure 3, the code block of 1.5 seconds and
and a pause period of 1.5 seconds. This code block consists of a fixed code consisting of 16 bits and a variable code, as shown in Figure 1.
It has 96 bits. The fixed code is
There are two types of signals: a first type signal consisting of ``0000111001101101'' and a second type signal ``1111000110010010'' consisting of a complementary value of this signal in bit units. This fixed code is fixed and does not change. There are two types of variable codes: region-based codes and time-based codes. There are 66 types of regional codes available, and as shown in Table 1, the codes sent out differ for each region. Broadcasting station (TV, radio)
Since the radio waves can reach areas outside the area (in particular, radio waves from Kyushu can sometimes be heard in Hokkaido), it is necessary to identify areas outside the target area of emergency warning broadcasts by identifying the area code. Therefore, this code is necessary.

【table】

[Table] The time corresponding code consists of parts including the year, month, day, and hour, and the time at the time of transmission is sent. This is provided as a countermeasure against radio wave interference, and can prevent interference using pseudo signals caused by simple recording. Also, in response to clock errors on the receiving device side, times that are 10 minutes late or 10 minutes ahead are also sent. As a receiving device for receiving emergency warning broadcasts having a format similar to this, there is a specific signal transmitting/receiving device disclosed in Japanese Patent Application Laid-Open No. 57-18138. This device is designed so that when a specific code is transmitted from a broadcasting station in the event of an emergency, the receiver detects this and allows the receiver to listen to this information preferentially. However, because this device does not allow the setting of regional codes, it is not possible to receive only emergency warning broadcasts targeted at a specific region, potentially causing unnecessary confusion. Purpose The purpose of the present invention is to not only selectively receive and listen to emergency warning broadcasts targeted at areas where the receiving device is grounded, but also to easily change the settings of regional codes as necessary. An object of the present invention is to provide an emergency warning broadcast receiving device that can perform emergency warning broadcasting. Composition of the Invention The present invention receives an emergency warning broadcast that includes a start signal, an alarm sound, and an end signal having a region-specific code, which are broadcast by interrupting the audio of a television broadcast or radio broadcast when an emergency situation occurs. for,
An antenna, a tuning circuit that tunes broadcast radio waves from the antenna, a demodulation circuit that demodulates the output from the tuning circuit, a loudspeaker circuit that amplifies the signal from the demodulation circuit, and a signal from the demodulation circuit. a detection circuit that detects an emergency warning signal; a setting circuit that presets the regional code; and a regional code included in the detected start signal in response to each output of the detection circuit and the setting circuit; and a control circuit which, when a preset regional compatible code matches, makes the warning sound broadcast after the start signal audible by the loudspeaker circuit, and returns to the original reception state by the subsequent end signal. An emergency warning broadcast receiving device comprising: a first setting means for setting a first region corresponding code provided inside the emergency warning broadcast receiving device; and a first setting means provided outside the emergency warning broadcast receiving device. The emergency warning broadcast receiving device is characterized in that it is equipped with a second setting means for setting a second regional code provided in the emergency warning broadcast receiving device. Embodiment FIG. 4 is a block diagram of an emergency warning broadcast receiving apparatus according to an embodiment of the present invention. Broadcast radio waves from an antenna 1 are applied to a tuner 2 including a tuning circuit, and a demodulation circuit 3 obtains an audio band signal. The tuner 2 can tune in and receive television broadcasts or radio broadcasts. Chuyuna 2
is tuned by the tuning operation unit 4 so that these broadcasts can be received. The selected frequency is displayed on the channel selection display section 5. The signal from the demodulation circuit 3 is given to a decoder 6 and an amplifier circuit 7.
The amplifier circuit 7 is normally inactive (that is, when no emergency warning broadcast is generated), and the decoder 6
The speaker 8 is activated in response to a control signal from the speaker 8.
to generate sound and amplify the sound. The decoder 6 detects and decodes the emergency warning signal from among the signals from the demodulation circuit 3, and provides a control signal to the amplifier circuit 7. A fixed code used as a reference value in the decoding process of the emergency warning signal is stored in the read-only memory 9. The regional code, which is one of the variable codes, can be set externally by the setting circuit 10.
This receiving device is configured to be able to set two area compatible codes. One of them is an internal deep switch, and the other is an external thumbwheel switch (i.e., the display of numbers 0 to 9 and the output value change when the knob is rotated). can be set. The numbers corresponding to the regional codes set externally are as shown in Table 1, and the codes and corresponding numbers displayed on the display 11 linked to each switch are as shown in Table 1. Therefore, regional codes are not displayed externally. The reason why a switch is provided so that two regional codes can be set in this way is as follows. This is because the regional codes include codes for nationwide broadcasting so that they can be received anywhere in the country, as well as specific regional codes. Regional codes (Table 1, regional codes for nationwide broadcasting are one of them) may change in the future, and in order to make sure that the receiver can be used even in this case, the internal day switch should be set. Make it possible to change (reset). The latter needs to be easily reconfigured because it is necessary to reconfigure the settings when the receiving device is moved. In this embodiment, since a combination thumb wheel switch is used, this setting can be easily changed. The area is displayed on display section 11
Displayed by. In connection with the time-corresponding code, the receiving device of the present invention has a clock. If the time becomes incorrect for some reason, it is necessary to set the time again. The receiving device of the present invention is equipped with an operation circuit 12 including operation buttons for performing this time adjustment. The display 13 also displays the year, month, day, hour, minute, and second. Check switch 14 is operated to enable amplifier circuit 7. This check switch 1
4 is also operated for testing external equipment L (television, radio, stereo, etc.) responsive to control signals from decoder 6. Tuning of the Tuner 2 is performed while listening to the audio of radio or television broadcasts. By operating the mode switch 15 and keeping it conductive, the decoder 6 also operates with the second type start signal. This type 2 start signal is generally used for emergency broadcasts with relatively low urgency. The receiving device is of a so-called three power supply type. That is, power from the commercial AC power supply is applied from the plug 16 via the rectifier 17 to the changeover switch 18 and further via the power switch 19 to the power supply circuit 20. A battery 21 is also provided. Furthermore, terminal 2
2 is supplied with power from the car battery. Transfer switch 18 automatically switches power from three such power sources. The power supply 20 always energizes the tuner 2, demodulation circuit 3, and decoder 6, and is therefore in a standby state in which it can receive emergency warning broadcasts at any time. FIG. 5 is a block diagram showing a specific configuration of the decoder 6. As shown in FIG. A processing circuit 23 implemented by, for example, an 8-bit microcomputer is provided. The FSK modulation signal from demodulation circuit 3 is
The audio signal includes an emergency warning broadcast signal, and only signals in the audio band are selected by the filter 24.
The signal is converted into a digital signal by the demodulation circuit 25 and provided to the interface 26 . interface 2
6 is connected to the processing circuit 23 via an address bus 27, a data bus 28, and a control bus 29. Reading of the emergency warning broadcast signal is processed by the main program of the processing circuit 23. The local code of the area corresponding code is obtained by independent thumbwheel switches corresponding to the 10th place and the 1st place. From each switch 30, 31, 2
A 4-bit base number output is obtained. This signal is applied to an 8-bit interface 32. The regional code for nationwide broadcasting is set by a deep switch 33 that can be set for each bit. The regional codes for nationwide broadcasting are:
Directly assign the 12-bit code in Table 1. This switch 33 is connected to interfaces 34 and 35. The 1MHz crystal oscillator 36 is connected to the frequency divider circuit 37.
The ^clock signal is given to the clock signal circuit 38. A clock function is achieved based on this signal. Also, the oscillation circuit 39
generates a signal of 32.768 KHz and divides it into 1/32 by the frequency dividing circuit 40, thereby obtaining the signal. 1024Hz
is applied to circuit 38. The signal from this frequency divider circuit 40 is used to perform interrupt timing. The two time signals thus created are displayed via the interface 41 on the time display section 13, which is realized by 12 light emitting diodes (abbreviated as LEDs). The interface 42 is capable of parallel input/output, and a control signal for activating the amplifier circuit 7 is generated from the port A0. Port A1
Outputs signals for controlling external equipment. Ports A2-A7 and Ports B0-B7
is used to receive the input signal. A mode switch 15 is connected to port A2, and a check switch 14 is connected to port A3. The remaining ports have a time adjustment operation circuit 12.
A switch provided for this is connected. This time setting operation section 12 allows the year, month, day, hour, minute,
Seconds are set. This switch is also used to adjust the time. (This is done in the same way as for setting the time on a known VTR, TV, etc.) Read-only memory 9
As mentioned above, fixed codes and region-specific codes are stored in . random access memory 4
3 is used as a work register of the processing circuit 23, etc. FIG. 6 shows the storage state of the random access memory 43. The regional code is set by thumbwheel switches 30, 31 and stored in a register 44 provided in random access memory 43. Further, the code for nationwide broadcasting is set by the dip switch 33 and stored in the register 45. With reference to FIG. 7, random access memory 4
3 is also provided with a fixed 2 flag register 46 and a time register 47. Time register 47
consists of pairs of registers for storing the year, month, day, hour, minute, and second, respectively. FIG. 8 shows the area code table provided in the read-only memory 9, and its contents are
It is as shown in the table. The operation according to the main program will be explained with reference to FIG. Reading of the digitized emergency warning signal given from the demodulation circuit 3 to the decoder 6 and demodulated by the demodulation circuit 25 to the processing circuit 23 is processed by an interrupt every 1 millisecond. The main program shown in FIG. 9 recognizes the regional code, determines the mode and check,
Performs time adjustment, clock functions including counting and time display, and initialization. Moving from step n1 to step n2, initialization is performed after the power is turned on, and in step n3, the thumbwheel switches 30 and 31 are activated via the interface 32.
The content of is read through the interface 32. At step n4, the region corresponding code, ie, the region code, sent via the interface 32 is stored in the register 44. At step n5, the output of the dip switch 33 is read through the interfaces 34 and 35, and stored in the register 45 at step n6. In step n7, input is performed using the interface 42. step n8
Then, it is determined whether the mode switch is on, and it is determined whether the second type emergency warning broadcast is also received. If the mode switch 15 is conductive, the step
Move to n9, set flag 46 and set it to logic "1",
When the circuit is shut off, the flag 46 is set to logic "0" at step n10. In step n11, it is determined whether the check switch 14 is on, and if so, a control signal is given to the amplifier circuit 7 to activate it, and if it is cut off, a cut-off control signal is not given to the amplifier circuit 7 and the amplifier circuit is turned on. 7 remains suspended. In step n14, it is determined whether the switch 12 for setting the time has been operated, and if so, the year, month, day, hour, minute, and second are identified, and step n14 is performed.
At n16, it is stored in the time register 47.
At step n17, the seconds are read, and when it is determined at step n18 that the seconds should be updated,
The process moves to step n19 and an update operation is performed. Similarly, in steps n20 to n31, the minutes, hours, days,
Update the month and year. In step n32,
Select the display segment of the display and proceed to step n33.
, the light emitting diodes corresponding to each segment are driven. FIG. 10 is a block diagram showing a specific configuration of the circuit 38. This circuit 38 is the processing circuit 23
interface 50 and internal control logic circuit 51
, an interrupt control circuit 52, and four sets of counter/timer channel logic circuits 53-56. 4
The channels of the set of independent logic circuits 53-56 are:
They are numbered sequentially from 0 to 3. This circuit 3
8 can generate individual vectors for each channel, and provides automatic vector instructions for interrupt service routines. Channel 0 assigns seconds, channel 1 assigns minutes, and channel 2 assigns hours. FIG. 11 shows the logic circuit 5 corresponding to channel 0.
FIG. 3 is a block diagram showing a specific configuration of No. 3; Other logic circuits 54 to 56 have similar configurations. This logic circuit 53 includes two registers 57 and 58 and a prescaler 60. Time constant register 57
If 60 is input in decimal form, this value is input and set to the down counter 59, and is counted down by an input signal every 1 Hz. After 60 seconds,
The contents of the down counter 59 become zero, and an output is obtained. This output is a minute-by-minute signal. This is input to the logic circuit 54 of channel 1, and 1 minute is counted. The contents of the down counter 59 are read out and input into the corresponding time register 47. Compare the read data with the value of the time register 47,
Determine whether to update. When updating is required, the value of the time register 47 is rewritten. To display the time, the processing circuit 23 is connected to the display 13 via the interface 41 and displays 12 digits. When these series of steps are completed, the process returns to the beginning. Referring to FIG. 12, random access memory 43 includes a 288-bit register 61, an 18-bit register 62, and an 18-bit reference register 6.
3 and a criterion register 64. Also, a start fixed position register 65 and a start fixed position register 66
, an end fixed register 67, a start area A register 68, a start area B register 69, and a start time register 70. When an emergency warning broadcast signal is generated, the signal including the emergency broadcast signal demodulated by the demodulation circuit 3 is taken into the processing circuit 23 via the interface 26 of the decoder 6. This process is performed by interrupting every millisecond. Interrupts are generated from logic circuit 56 corresponding to channel 3 of interface 42. In other words, the logic circuit 5 of channel 3
6 is supplied with a 1 Hz signal from the frequency dividing circuit 37, that is, a signal with a period of about 1 millisecond, and an interrupt is applied from this logic circuit 56. For this data reading and decoding processing, registers 61 to 70 shown in FIG. 12 are used, and their operations are as shown in FIG. 13. First, data is read from step m1 to step m2, and judgment criteria are checked at step m3. This data is sent at a transmission rate of 64 bits per second. This signal is sampled every millisecond. Therefore, 1 bit of data is sampled 16 times (=1024Hz/64). In step m4, the first type of fixed start code is detected, in step m5 the second type of fixed start code is detected, and in steps m6, m7, and m8, the start area codes A and B and the time code are detected. To detect.
Area code A is detected using random access memory 4.
Similar to the data in the register 44 in No. 3, the start area A register 68 (area code is memorized when a radio wave (emergency broadcast signal) sent from a broadcasting station is received) is provided in the random access memory 43. Compare data. This is the processing circuit 23
is executed. Starting area code B is processed in the same way. If the starting fixed code is the first type, the process moves to step m6. The state of the mode switch 15 is
This can be determined by referring to the start fixed 2 register 66. time code step
When the time at m8 coincides with the time announced in the circuit 38, the process moves to step m9. If the time codes do not match, the process moves to step m11.
The determination is made by referring to the contents of the end fixed register 67. To set the start command at step m9,
The fixed start signal must be detected four times, and the regional code and time code each have to be detected once. If this condition is satisfied, step m10
Then, the decoder 16 activates the amplifier circuit 7 so that the audio can be heard, and the external device L is controlled. If the times do not match, it is determined in step m11 whether there is an end signal or not. If it is an end signal, it is determined in step m12 whether this signal has been detected twice. When the fixed code is detected twice, the amplifier circuit 7 is disabled and the external device L is stopped. FIG. 14 shows the operation of data reading processing,
FIG. 15 is a model diagram showing a configuration for detecting data in units of 4 bits, and FIG. 16 is a waveform diagram thereof. Referring to FIGS. 15 and 16, a 64-bit shift register 70 has four outputs B0, B1, B2, and B3 for each 16 bits. Now, assume that the signal "1101" is detected as shown in FIG. from the frequency dividing circuit 37
Data is loaded into shift register 70 according to a 1024 Hz sampling clock. When all 4 bits of data have been taken in, the outputs b0-b3 of the shift register appear as "1101".
If the signal is read without error, the same output will appear for 16 sample periods. The data one sampling bit before is stored in the register 72, and the comparison circuit 71 compares the output from the shift register 70 and the output from the register 72,
When they match, a signal is output to the AND gate 73.
Furthermore, the signal from this AND gate 73 is counted by a counter 74. When a reading error occurs for some reason during data sampling, the output of the AND gate 73 becomes, for example, "5" or "8". When read correctly, it is "16". If the reading operation is to be performed when the count value of the counter 74 reaches "6" or more, the judgment reference circuit 75
gives its value "6" to the counter 74 for comparison. The counter 74 derives a signal when the count value reaches "6". The output from this counter 74 is used as the aforementioned determination reference signal. In the above-described embodiment, the comparison search is performed in units of 16 bits, but the comparison detection may be performed in units of 18 bits. When reading data, move from step s1 to step s2 in FIG.
reads the data, shifts the bits in register 61, and transfers them to register 62 in step s4. In step s5, the contents of the register 62 and the contents of the reference register 63 are compared, and if they match, the determination criterion register 64 is counted up in step s6. In step s7, the contents of the register 62 are transferred to the reference register 63 and stored. If the contents of the register 62 and the contents of the reference register 63 do not match, the process moves to step s7. Data judgment such as start and end is 2
This is done within 18 (=2+16) bits, which are the lower two bits of the bit prefix or variable code.
Since each bit 1 is sampled with 16 clock pulses, a 288 (=6×18) bit register is required. It reads one bit every millisecond and then shifts by one bit for 287 bits. Register 61 has 36 8-bit registers.
Signals are read out from every other register among these. This signal corresponds to the outputs b0, b1, and
Corresponds to b2 and b3. The 18-bit signal is transferred to the register 62 in step s4 described above. The reference register 63 stores the contents of the register 62 at the time of the previous interrupt. Therefore, when the data match, the judgment criterion register 64 is counted up and incremented. It is determined in step s8 whether the determination criteria are satisfied. This means that the criterion register 64
The purpose is to check whether the content of has become "6". The content of this judgment criterion register 64 is "6"
When this happens, it means that the same data has been received six times, and therefore it is determined that it is better to start or end the reception amplification of the emergency warning broadcast. The 1-bit data is sampled 16 times, and when all of it is read correctly, it is determined in step s9 whether the same data meets the criteria twice.
In order to prevent the judgment criterion from being satisfied twice with the same data and determining that two fixed or variable codes have arrived in one fixed or variable code judgment, the second judgment criterion is ignored in step s10. . In this way, in step s11, the fixed start type 1 signal is detected. The same applies to the second type signal. Effects As described above, the present invention provides a first
A region corresponding code setting circuit is provided, which includes a first setting means for setting a region corresponding code, and a second setting means for setting a second region corresponding code outside the receiving device. Among the regionally compatible codes, a regionally compatible code that does not require frequent setting changes, such as a code for nationwide broadcasting, is set as a first regionally compatible code by a first setting means provided internally. This will prevent accidents such as misidentifying the switch as another switch and changing the settings, and prevent unforeseen situations such as failing to receive particularly important emergency broadcasts such as nationwide broadcasts. Not only that, but also if it becomes necessary to change the setting of this first code, it is possible to change the setting as necessary. In addition, the area code that is expected to need to be reconfigured frequently as the receiving device moves, such as the area code that represents a specific region, is converted into a second area code. By setting the code using a second setting means provided externally, it is possible to easily change the regional code depending on the installation location of the receiving device, making it possible to reliably listen to the necessary emergency warning broadcasts. can, and furthermore,
Since the system can easily be set to receive emergency warning broadcasts from other regions, it has the remarkable effect that it is easy to obtain information about other regions in advance and prepare for emergencies. In particular, according to the present invention, a region corresponding code is set in advance in the setting circuit, and the region corresponding code in the start signal included in the emergency warning signal broadcast from the broadcasting station is set in advance in the setting circuit. Since the alarm sound that is broadcast after the start signal is made into audible sound by the amplification circuit when the code matches the area corresponding code given by By setting this, even if the installation location of the receiving device changes, the necessary emergency warning can be reliably heard at the installation location.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the code block of an emergency warning signal, FIG. 2 is a diagram showing the configuration of a start signal, FIG. 3 is a diagram showing the configuration of an end signal, and FIG. 4 is a diagram showing a block diagram of an embodiment of the present invention. 5 is a block diagram showing a specific configuration of the decoder 6, FIGS. 6 and 7 are diagrams showing a part of the random access memory 43, and FIG. 8 is a diagram showing a part of the read-on memory 9. Figure, No. 9
10 is a block diagram showing the specific configuration of the circuit 38, FIG. 11 is a block diagram showing the specific configuration of the logic circuit 53, and FIG. 12 is a diagram showing the operation of the main program of the processing circuit 23. 13 is a flowchart for explaining the operation of data reading and decoding processing, and FIG. 14 is a flowchart for explaining the detailed operation of the data reading operation. FIG. 15 is a diagram showing a modeled configuration for reading data, and FIG. 16 is a waveform diagram for explaining the operation. 1...Antenna, 2...Tuner, 3...Demodulation circuit, 6...Decoder, 7...Amplification circuit, 8...
Speaker, 10...Region code setting circuit, 12
. . . Time adjustment operation section, 20 . . . Power supply.

Claims (1)

[Scope of Claims] 1. To receive an emergency warning broadcast that includes a start signal, warning sound, and end signal having a region-specific code, which are broadcast by interrupting the audio of a television broadcast or radio broadcast when an emergency situation occurs. an antenna, a tuning circuit that tunes broadcast waves from the antenna, a demodulation circuit that demodulates the output from the tuning circuit, a loudspeaker circuit that amplifies the signal from the demodulation circuit, and a signal of the demodulation circuit. a detection circuit that detects an emergency warning signal from within the area; a setting circuit that presets the region corresponding code; and a detection circuit that responds to each output of the detection circuit and the setting circuit to detect the region included in the detected start signal. When the corresponding code matches a preset area compatible code, the warning sound broadcast after the start signal is made into audible sound by the loudspeaker circuit, and the original reception state is restored by the subsequent end signal. an emergency warning broadcast receiving device including: a first setting means for setting a first region corresponding code provided inside the emergency warning broadcast receiving device; An emergency warning broadcast receiving device comprising: second setting means for setting a second regional code provided outside the device.