JPH048674Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a weather report broadcast receiving device (WEATHER RADIO) for receiving local weather report broadcasts transmitted from local stations in the United States, etc.
RECEIVER).

(Prior art) In industries that deal with nature, such as agriculture and fishing, local weather reporting in the area is important. For this reason, in countries such as the United States which have vast areas with varied topography, there are many local stations that specialize in broadcasting local weather reports. These local stations provide weather reports to an area of approximately 100km radius with a small transmission power of around 300W. And, to avoid interference with local station broadcasts in adjacent areas, 162.4K
Hz, 162.475KHz, or 162.55KHz. Broadcasting is done on a carrier wave that is different from the adjacent station. Also, for about 10 seconds before a weather report is sent,
An alert signal containing a frequency of 1.05 KHz is transmitted and configured to alert those who wish to listen to the weather report. Then, weather reports and disaster reports are broadcast from local stations periodically or at any time to notify of sudden changes in the weather.

A conventional weather report broadcast receiving device for receiving such weather report broadcasts is always in operation so as to be able to listen to broadcasts at any time, and is on standby to receive weather report broadcasts. In addition, some receiving devices
Some devices emit a warning sound when receiving an alert signal that is sent prior to the transmission of a weather report, and the weather report can only be heard when the listener performs a switching operation as necessary.

(Problem to be solved by the invention) By the way, the conventional weather report broadcast receiving device uses a commercial AC power source as its power supply source, and the battery is only used for backup when the commercial AC power supply goes out. . Therefore, even if the weather report broadcast receiving device is kept in operation all the time, there is no major problem particularly in terms of power consumption.

However, in recent years, there has been a demand for a weather report broadcast receiving apparatus that uses a battery as a power supply source for use in a vehicle or for portable use. Therefore, if a battery is simply used as a power supply source instead of a commercial AC power source, the battery will have a limited amount of power to supply.
If the receiving device is always in operation, the amount of power consumed while waiting to receive an alert signal cannot be ignored, and there is a problem that the service life of the battery is shortened. Furthermore, the battery must be replaced frequently, making maintenance management complicated.

Also, depending on the importance of the weather report on the listener's side, there is a constant operation mode in which the receiving device is always in operation and listens every time a weather report is sent without worrying about battery power consumption, or Outputs an alarm sound when a report is about to be sent,
An instant mode for listening to weather reports as necessary, and a lock mode for continuously outputting a warning sound at the time a weather report is about to be sent and even after that to call attention to the fact that a weather report has been issued or has been issued. It is desirable to be able to select and set the receiving device arbitrarily.

The object of the present invention has been made in view of the above-mentioned circumstances of the conventional weather report broadcast receiving device, and it is possible to arbitrarily select and set the above-mentioned constant operation mode, instant mode, and lock mode, and in the above-mentioned instant mode and lock mode, To provide a weather report broadcast receiving device that reduces power consumption while waiting to receive a weather report broadcast.

(Means for Solving the Problem) In order to achieve the above object, the weather report broadcast receiving device of the present invention receives a weather report broadcast in which an alert signal containing a predetermined frequency is transmitted prior to transmitting the weather report. A weather report broadcast receiving device for the purpose of the present invention, comprising an intermittent operation control means for repeatedly supplying and cutting off power to bring the receiving device into an intermittently operating state, and detecting the alert signal in the operating state of the receiving device. comprising an alert detection means, an alarm sound oscillation means, and a changeover switch for setting a reception mode of the reception device, the changeover switch causes the reception device to operate intermittently until the alert signal is detected; After an alert signal is detected, the lock mode outputs an alarm sound until the changeover switch is switched to another mode, and while the alert signal is not detected, the receiver is operated intermittently, and while the alert signal is detected, the receiver is operated intermittently. The receiving device is configured to be selectively set to an instant mode in which an alarm sound is output, and a constant operating mode in which broadcasts can be received at all times.

Further, the intermittent operation control means repeatedly supplies and cuts off power to the receiving circuit up to the audio demodulation circuit to bring the receiving circuit into an intermittently operating state, and in the operating state of the receiving circuit, the alert detecting means detects the alert. A control means is provided for detecting the presence or absence of signal transmission and controlling the operation of the audio amplification circuit by supplying and cutting off power, and when the alert detection means detects the transmission of the alert signal, the output is inverted and the A holding means is provided to continue the inverted output even when the transmission of the alert signal ceases, and the changeover switch causes the intermittent operation control means to intermittently operate the receiving circuit until the transmission of the alert signal is detected. At the same time, the control means puts the audio amplification circuit into a non-operating state, and when transmission of the alert signal is detected by the alert detection means, the output of the holding means is inverted, and this inverted output causes the receiving circuit and the A lock mode in which the sound amplification circuit is activated and the alarm sound oscillation means is operated to oscillate, and the oscillation output is amplified and outputted by the sound amplification circuit, and a lock mode in which the reception circuit is intermittently activated while transmission of the alert signal is not detected. the audio amplifying circuit is inactive, and even if the alert signal is detected by the alert detecting means, the output of the holding means is not inverted, and the alert is detected by the detection output of the alert detecting means. an instant mode in which the receiving circuit and the audio amplification circuit are activated only while a signal is being detected, the alarm sound oscillation means is operated in oscillation, and the oscillation output is amplified and outputted by the audio amplification circuit; a constant operation mode in which the receiving circuit and the audio amplification circuit are put into an operating state and the oscillation operation of the alarm sound oscillation means is stopped, regardless of whether or not an alert signal is transmitted;
The configuration may be such that the reception mode is selectively set.

Furthermore, the oscillation output of the alarm sound oscillation means may be provided to the NF terminal of the audio amplification circuit.

(Function) Therefore, by operating the changeover switch, the weather report broadcast receiving device can be operated in a constant operating mode, an instant mode in which a warning sound is output only while an alert signal is being transmitted, and an alert signal. After the alarm is detected, the alarm can be set to a lock mode in which the alarm continues to be output until the changeover switch is operated. Moreover,
In instant mode, the receiving device is intermittently activated while no alert signal is detected, and in lock mode, the receiving device is intermittently activated and supplies power to the receiving device until an alert signal is detected. Battery power consumption can be reduced.

Furthermore, if the receiving circuit up to the audio demodulation circuit is activated intermittently by the intermittent operation control means, and the audio amplification circuit is activated upon detection of an alert signal, the receiving device can be operated intermittently in instant mode and lock mode. less power is consumed in the state.

Furthermore, if the output of the alarm sound oscillation means is applied to the NF terminal of the audio amplifier circuit, the alarm sound will be amplified and output at a constant volume regardless of the setting of the volume controller.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a block circuit diagram of an embodiment of the weather report broadcast receiving device of the present invention, and FIG. 2 is a circuit diagram of a specific example of the alert signal extractor, rectifier, and waveform shaper of FIG. FIG. 3 is a time chart illustrating the operation when the reception mode of the weather report broadcast receiving device of the present invention is set to lock mode, and FIG.
This is a time chart explaining the operation when set to instant mode.

First, in FIGS. 1 and 2, a broadcast radio signal received by an antenna 1 is transmitted to a high frequency amplifier circuit 2.
The signal is applied to the intermediate frequency conversion circuit 3 via the local oscillation circuit 4, mixed with the local oscillation signal from the local oscillation circuit 4, converted into an intermediate frequency signal, and applied to the audio demodulation circuit 5. The local oscillation signal of the local oscillation circuit 4 is switched in three ways by the local oscillation frequency changeover switch 6, and the receiving device receives 162.4KHz, 162.475KHz,
It is configured so that it can be selectively set to receive weather report broadcasts on any one carrier wave of 162.55KHz.

Further, the audio output demodulated by the audio demodulation circuit 5 is divided into two parts, and one audio output is applied to a variable resistor 10, which is a volume adjuster, through a capacitor 7, a resistor 8, and a capacitor 9 in series. It will be done. A transistor 11 serving as a muting means is interposed between the audio output signal path and ground. Further, the other audio output divided into two is given to the alert signal extractor 12. The audio output whose signal size has been adjusted by the variable resistor 10, which is a volume adjuster, is given to the audio amplification circuit 13, where it is appropriately amplified and outputted according to the size and amplified from the speaker 14.

As shown in FIG. 2, the alert signal extractor 12 is formed of a bandpass filter including an operational amplifier 15, and extracts an alert signal containing 1.05 KHz from the audio output. The alert signal extracted here is rectified by a rectifier 16 and is then rectified by a waveform shaper 17.
given to. When the alert signal is not extracted, "H" is output to one output terminal a of the waveform shaper 17, and when the alert signal is extracted and the output of the rectifier 16 switches from "L" to "H". , is switched to "L". Further, to the other output terminal b of the waveform shaper 17, contrary to the output terminal a, "L" is output when no alert signal is extracted, and "H" is output when an alert signal is extracted. These alert signal extractor 12, rectifier 16, and waveform shaper 17 constitute alert detection means.

The terminal voltage of the battery 19 is transmitted via a transistor 20 to a receiving circuit consisting of a high frequency amplifier circuit 2, an intermediate frequency conversion circuit 3, a local oscillation circuit 4, and an audio demodulation circuit 5, an alert signal extractor 12, and a waveform shaper 17. Another transistor 2 is provided as a power supply source and is a control means.
1 as a power supply source to the audio amplification circuit 13. The base of the transistor 20 is supplied with the output of the output terminal b of the waveform shaper 17 through a diode 22 in the forward direction, and is connected to a NAND circuit 23 which constitutes an intermittent operation oscillator with a duty cycle of 20% at a period of, for example, 1 sec. Output is provided through diode 24 in the forward direction. An intermittent operation control means is constituted by the NAND circuit 23 and the transistor 20 which constitute the intermittent operation oscillator.

Moreover, the output of the output terminal a of the waveform shaper 17 is
For example, 1.05KHz through diode 25 in the forward direction.
The signal is applied to an input terminal of a NAND circuit 26 constituting an alarm sound oscillation means for oscillating the signal, and is also applied via a capacitor 27 to one input terminal of another NAND circuit 28. An alert test switch 29 and a transistor 30 are interposed in parallel between the anode of the diode 25 and ground. The output of this NAND circuit 26 is divided into two parts, one is given to the NF terminal of the audio amplifier circuit 13 via a resistor 31 and a capacitor 32 in series, and the other is given to the NF terminal of the audio amplifier circuit 13 through a resistor 31 and a capacitor 32.
is applied to the base of transistor 21 via. Note that the NF terminal of the audio amplification circuit 13 is grounded via a capacitor 32 and a resistor 34 in series. The base of the transistor 21 is grounded via a capacitor 35, and the capacitor 35 and resistor 33 form a smoothing circuit that smoothes the output of the NAND circuit 26. This smoothing circuit and the transistor 21 constitute a control means.

Furthermore, one input terminal of the NAND circuit 28 connected to the capacitor 27 is connected to the output terminal of the battery 19 via a resistor 36. The output of this NAND circuit 28 is given to the base of a transistor 30, and is also applied to another NAND circuit 3.
is applied to one input terminal of 7. The output of this NAND circuit 37 is then given to the other input terminal of the NAND circuit 28. Furthermore, NAND circuit 3
The other input terminal of 7 is connected to the output terminal of the battery 19 via a resistor 38 and grounded via a capacitor 39. A holding means includes these NAND circuits 28 and 37.

By the way, the weather report broadcast receiving device of the present invention has the following features:
When an alert signal is detected, the lock mode continues to amplify the alarm sound unless a changeover switch is operated to set the reception mode of the receiving device, and the instant mode amplifies the alarm sound only while the alert signal is detected. mode, and a constant operation mode in which the receiver is always in operation. And these 3
To switch and set the reception mode, press 2.
Two changeover switches 40 and 41 are provided in conjunction with each other. Common contact c of one selector switch 40
is connected to the output terminal of the battery 19, and the contact connected in lock mode and instant mode is the transistor 1 which is the muting means.
A contact connected to the base of the transistor 1 and connected in the normal operating mode is connected to the input terminal of the NAND circuit 26 through a diode 42 in the forward direction, and is also connected to the emitter of the transistor 21 through a diode 45. The emitter of this transistor 21 is connected to a NAND circuit 23 via a diode 43.
It is also connected to the base of the transistor 20 via a diode 44. The common contact c of the other switch 41 is grounded,
The contacts connected in the lock mode are not connected to any circuit, and the contacts connected in the instant mode and the always-on mode are both connected to the other input terminal of the NAND circuit 37.

Note that the NAND circuits 23, 26, 28, and 37 are
Power is constantly supplied from the output terminal of the battery 19.

The operation of this configuration will be described below with reference to FIGS. 3 and 4.

First, the case where the changeover switches 40 and 41 are set to the lock mode will be explained. In the standby state where transmission of an alert signal is not detected, the output terminal a of the waveform shaper 17 outputs "H" as shown in FIG. 3, and the input of the NAND circuit 26 is "H".
It is. Therefore, the alarm sound oscillation means does not oscillate as shown in FIG. 3 and 5, and the output of the NAND circuit 26 is "L". Therefore, the transistor 21 is non-conductive as shown in FIG. 36, and the audio amplifier circuit 13
is unpowered and inactive. By the way, the input of the NAND circuit 23 is "L", and the intermittent operation oscillator operates to oscillate, so that the output of the NAND circuit 23 becomes "H" intermittently as shown in FIG. 37.
Note that the output terminal b of the waveform shaper 17 is as shown in FIG.
It is "L" like this. In addition, the NAND circuit 37
When the power switch (not shown) of the receiver is turned on, the rise of the voltage applied to one input terminal is delayed by the capacitor 39, and its output becomes "H". For this, the NAND circuit 2
Both inputs of 8 become "H", and the output becomes "L" as shown in FIG. 34. After that, even if the voltage at one input terminal of the NAND circuit 37 rises and reverses to "H", the other input is already "L".
The output of the NAND circuit 37 is maintained at "H" and no state change occurs. During the standby state in which transmission of an alert signal is not detected, the transistor 20 is intermittently turned on as shown in FIG. 38 by the oscillation output of the NAND circuit 23 as an intermittent operation oscillator as shown in FIG. 37. Audio demodulation circuit 5
The receiving circuits up to this point are intermittently supplied with power from the battery 19 and are intermittently activated.

In such an intermittent operating state of the receiving circuit, when the transmission of the alert signal starts at t ₁ in Fig. 3, the alert signal is extracted in the first operating state of the receiving circuit after transmission. The output terminal a of the waveform shaper 17 is inverted from "H" to "L" as shown in FIG.
is inverted from "L" to "H" as shown in FIG. Then, the inverted output of the output terminal a to "L" is differentiated by the capacitor 27, and one input of the NAND circuit 28 momentarily becomes "L", and its output is inverted to "H". In this way, the output of the holding means is inverted. Therefore, even if the output of the NAND circuit 37 is inverted to "L" and the voltage applied to the input terminal connected to the capacitor 27 of the NAND circuit 28 returns to "H", the output of the NAND circuit 28 is
As shown in FIG. 3, the signal remains at "H". The transistor 30 becomes conductive due to the "H" output of the NAND circuit 28, and since the output terminal a of the waveform shaper 17 is "L", the input of the NAND circuit 26 becomes "L", and the alarm sound oscillation means oscillates, and the NAND circuit 26 outputs an oscillation frequency of 1.05 KHz, which is the same as the alert signal, as shown in FIG. 3 and 5. The oscillation output of the NAND circuit 26 is smoothed by the capacitor 35, the transistor 21 is made conductive as shown in FIG. Become. Here, the NAND circuit 26
The output is given to the NF terminal of the audio amplification circuit 13, and the alarm sound is amplified from the speaker 14 at a constant volume regardless of the volume adjustment of the volume controller. On the other hand, when the output terminal b of the waveform shaper 17 is inverted to "H", the transistor 20 becomes conductive. Also,
Due to the conduction of the transistor 21, the battery 19
A terminal voltage of is applied to the base of the transistor 20 through the diode 44, and the transistor 20 becomes conductive as shown in FIG. 38. Further, due to the conduction of the transistor 21, the input of the NAND circuit 23, which is an oscillator for intermittent operation, becomes "H", and the oscillation operation is stopped as shown in FIG. 37. Note that the audio output provided from the audio demodulation circuit 5 to the variable resistor 10 is muted by conduction of the transistor 11, which is a muting means.

Furthermore, when the transmission of the alert signal stops at _t2 in FIG. 3, the alert signal is not extracted from the alert signal extractor 12, and the output terminal a of the waveform shaper 17 becomes "H" again as shown in FIG. 3. 3, and the output terminal b returns to "L" again as shown in FIG. However, the "H" output of the NAND circuit 28, which is the output of the holding means, does not change as shown in FIG. 3. Therefore, the conduction of the transistor 30 is maintained, the oscillation operation of the alarm sound oscillation means continues, the oscillation output of the NAND circuit 26 is continuously output as shown in FIG. 3, and the conduction state of the transistors 20 and 21 is changed to 3 Continue together as shown in Figure 8.

Therefore, in the lock mode, the receiving circuits up to the audio demodulation circuit 5 are intermittently in operation and the audio amplification circuit 13 is inactive until transmission of the alert signal is started. When transmission of an alert signal is detected, power is supplied to both the receiving circuit and the audio amplification circuit 13 to put them into operation, and an alarm sound is amplified from the speaker 14. Further, even after the transmission of the alert signal is stopped, the receiving circuit and the audio amplification circuit 13 are maintained in the operating state, and the amplification of the alarm sound is continued.

If the changeover switches 40 and 41 are operated to switch to the instant mode, the alarm sound will stop as will be described later, and the intermittent operation of the receiving circuit will be controlled. Furthermore, by operating the changeover switches 40 and 41 to switch to the constant operation mode, it is possible to listen to weather report broadcasts that are transmitted after the alert signal, as will be described later.

Next, the case where the changeover switches 40 and 41 are set to instant mode will be explained. The lock mode is the same as the lock mode described above until the transmission of the alert signal begins. Also, the transmission of the alert signal is started at t ₁ in FIG. 4, and the alert signal extractor 1
2, the alert signal is extracted, the output terminal a of the waveform shaper 17 is inverted to "L", and the output terminal b is inverted to "H", which is the same as in the lock mode. However, the output terminal a of the waveform shaper 17 is inverted from "H" to "L", differentiated by the capacitor 27, and "L" is momentarily applied to one input of the NAND circuit 28, so that its output becomes " Even if the output is "H", one input terminal of the NAND circuit 37 is grounded and is always "L", and its output is always "H". Therefore, the output of the NAND circuit 28 is as shown in FIG.
It only momentarily becomes "H" in a pulse-like manner, and then returns to "L" immediately. Therefore, the output of the holding means is not inverted. For this reason, while the transmission of the alert signal is detected, the transistor 20 is conductive, power is supplied to the receiving circuit and it is in operation, the NAND circuit 26 is oscillating, and the transistor 21 is conductive to amplify the sound. circuit 1
3 is supplied with power, and an alarm sound is amplified from the speaker 14.

However, when the transmission of the alert signal is stopped and the output terminal a of the waveform shaper 17 returns to "H" and the output terminal b returns to "L", the NAND circuit 26
The input becomes "H", the oscillation operation stops as shown in FIG. 4, and the transistor 21 becomes non-conductive as shown in FIG. 4. Then, the oscillation operation of the NAND circuit 23, which is an oscillator for intermittent operation, is restarted as shown in FIG. 4, and the oscillation output causes the transistor 20 to become intermittently conductive as shown in FIG. 4.

Therefore, in instant mode,
Before the transmission of the alert signal is started and after the transmission of the alert signal is stopped, only the receiving circuit is intermittently activated. Then, while the alert signal is being transmitted, the alarm sound is emitted from the speaker 14.
The sound is amplified from

Here, if the changeover switches 40, 41 are operated to switch to the constant operation mode during or after the amplification of the warning sound, the weather report broadcast following the alert signal can be heard.

Note that if the changeover switches 40 and 41 are set to lock mode or instant mode and the alert test switch 29 is closed when no alert signal is being transmitted, the alert signal will be detected by the alert signal extractor 12. The same operation is performed. In the lock mode and instant mode, the terminal voltage of the battery 19 is applied to the base of the transistor 11, and the audio output transmitted from the audio demodulation circuit 5 to the audio amplification circuit 13 is muted. Only the oscillation output of is amplified and output.

Finally, the case where the changeover switches 40 and 41 are set to the constant operation mode will be explained. The terminal voltage of the battery 19 is applied to the contact via the changeover switch 40, the input of the NAND circuit 26 becomes "H" via the diode 42, and the alarm sound oscillation means oscillates regardless of the output of the waveform shaper 17. It is considered to be in a stopped state. Further, power is supplied to the audio amplification circuit 13 via the diode 45, and the audio amplification circuit 13 is brought into operation. Furthermore, diode 4
The base of the transistor 20 is set to "H" and conductive via the diode 43, power is supplied to the receiving circuit, and the receiving circuit is put into an operating state.
The input of the NAND circuit 23 is set to "H" via the oscillator, and the oscillation of the intermittent operation oscillator is stopped. Note that the base of the transistor 11 serving as the muting means becomes "L", and the audio output from the audio demodulation circuit 5 is not muted.

Therefore, in the constant operation mode, the receiving device is always in operation, and when a weather report is broadcast, the alert signal and the weather report are amplified from the speaker 14.

Another embodiment of the present invention will be described with reference to FIGS. 5 to 7. FIG. 5 is a block circuit diagram of another embodiment of the weather report broadcast receiving device of the present invention, and FIG. 6 shows a state in which the reception mode of the receiving device of the other embodiment of FIG. 5 is set to lock mode. FIG. 7 is a time chart illustrating the operation when the instant mode is set. In FIGS. 5 to 7, the same circuits and operating waveforms of the same circuits as in FIGS. 1 to 4 are denoted by the same reference numerals, and redundant explanation will be omitted.

First, in FIG. 5, the alert signal extractor 12 extracts the audio output from the audio demodulation circuit 5.
The alert signal is extracted at , further rectified by a rectifier 16 and provided to a waveform shaper 50 . This waveform shaper 50 outputs "L" when no alert signal is extracted, and outputs "H" when an alert signal is extracted. These alert signal extractor 12, rectifier 16 and waveform shaper 5
0 constitutes an alert detection means.

The terminal voltage of the battery 19 is applied to one terminal of a power switch 51, and from the other terminal is passed through a PNP transistor 52 in series to the receiving circuit up to the audio demodulation circuit 5 and the alert detection means as a power supply source. Given. Further, the power is supplied from the other terminal of the power switch 51 through another PNP transistor 53 in series as a power supply source for the audio amplification circuit 13.

The output of the NAND circuit 23 constituting the intermittent operation oscillator is applied to the base of the transistor 52 via a diode 54 in the opposite direction. The output of the waveform shaper 50 is applied to the input terminal of the NAND circuit 23 via a diode 55 in the forward direction. Further, the output of the waveform shaper 50 is transmitted through the resistor 56.
Applied to the base of PNP transistor 57.
The base and emitter of transistor 57 are connected to the other terminal of power switch 51 via resistors 58 and 59, respectively. Then, the output of the collector of the transistor 57 is connected to the diode 60.
is applied in the forward direction to the input terminal of a NAND circuit 26 constituting the alarm oscillation means. The output of the NAND circuit 26 is applied to the NF terminal of the audio amplifier circuit 13 and also to the base of the NPN transistor 61 via the resistor 33. this
The base of NPN transistor 61 is capacitor 3
5 to ground. Further, the collector of this transistor 61 is connected to the base of the transistor 53, and the emitter is grounded.

Further, the base of the transistor 53 is connected to one input terminal of the NAND circuit 28 via a capacitor 62. One input terminal of this NAND circuit 28 is connected to the other terminal of the power switch 51 via a resistor 36 and a capacitor 63.
grounded via. The other input terminal is connected to the output terminal of another NAND circuit 37,
The output terminal of the NAND circuit 28 is another NAND circuit 37
is connected to one input terminal of the The other input terminal of this other NAND circuit 37 is connected to the other terminal of the power switch 51 via a resistor 38, grounded via a capacitor 39, and further connected to the contact of one of the changeover switches 41. Ru. Note that the contacts of this changeover switch 41 are not connected to any circuit, and the common contact c is grounded. The output terminal of the NAND circuit 37 is connected to the collector of the transistor 57 via the diode 64 in the opposite direction.

The common contact c of the other changeover switch 40 is connected to the other terminal of the power switch 51, and the contact
is connected to the base of transistor 11. Further, the contact is connected to the input terminal of the NAND circuit 26 through the diode 42 in the forward direction, and to the input terminal of the NAND circuit 23 through the diode 43 in the forward direction. Furthermore, it is connected to the base of the transistor 61 via a diode 65 and a resistor 66 in series in the forward direction.

Note that the intermittent operation control means includes the transistor 52 and the NAND circuit 23. Also,
A holding means includes the NAND circuits 28 and 37, and a control means includes the transistors 53 and 61.

The operation of this configuration will be described below with reference to FIGS. 6 and 7.

First, the case where the changeover switches 40 and 41 are set to the lock mode will be explained. In a standby state in which transmission of an alert signal is not detected, the waveform shaper 50 outputs "L" as shown in FIG. 6, the transistor 57 becomes conductive, and the NAND circuit 26
When the input becomes "H", the alarm sound oscillation means,
There is no oscillation as shown in Figure 6.5. Therefore, transistor 61 is non-conductive, and transistor 53
As shown in FIG. 6, the battery 19 is also non-conductive and no power is supplied to the audio amplifier circuit 13 from the battery 19. on the other hand,
The input of the NAND circuit 23 is "L", the intermittent operation oscillator operates as shown in FIG. Power is intermittently supplied to the circuit and it becomes operational. In addition, NAND circuit 3
The output of 7 is "H" as shown in FIG. 6 4'.

In such an intermittent operating state of the receiving circuit, when transmission of the alert signal is started at t ₁ in FIG. 6, the waveform shaper 50
The output of is inverted to "H" as shown in FIG.
Then, the transistor 57 becomes non-conductive, the input of the NAND circuit 26 becomes "L", and the alarm sound oscillation means starts the oscillation operation as shown in FIG. 6. Further, the input of the NAND circuit 23 becomes "H" through the diode 55, the oscillation operation of the intermittent operation oscillator is stopped, and its output becomes "L" as shown in FIG.
becomes. Therefore, the transistor 52 becomes conductive as shown in FIG. 6, and the receiving circuit is maintained in an operating state. On the other hand, the oscillation output of the alarm sound oscillation means is smoothed by the resistor 33 and the capacitor 35, and the transistor 61 is made conductive, and the transistor 53 is made conductive as shown in FIG. to the operating state. As the transistor 61 becomes conductive, the output of the NAND circuit 37 is inverted to "L" as shown in FIG. 64'. In this way, both the receiving circuit and the audio amplifying circuit 13 become operational, and the oscillation output of the alarm sound oscillating means is amplified and output by the audio amplifying circuit 13.

Then, when the transmission of the alert signal stops at _t2 in FIG. 6, the output of the waveform shaper 50 becomes "L" again as shown in FIG. Also Figure 6 8
The receiving circuit is intermittently activated as shown in FIG. However, the output of the NAND circuit 37 remains "L" as shown in FIG. 64' until the changeover switches 40 and 41 are switched, and the oscillation operation of the alarm sound oscillation means continues. Therefore, the audio amplification circuit 13 continues to amplify and output the alarm sound.

Next, the case where the changeover switches 40 and 41 are set to instant mode will be explained. Transmission of the alert signal starts at _t1 in FIG. 7, and even if the transistor 61 becomes conductive, the output of the NAND circuit 37 remains at "H" as shown in FIG. 74'. For this reason, when the transmission of the alert signal stops at t ₂ in Figure 7 1, the oscillation operation of the intermittent operation oscillator is restarted, the receiving circuit is intermittently activated, and the oscillation of the alarm sound oscillation means is resumed. The operation is stopped as shown in FIG. 7, the transistor 53 becomes non-conductive as shown in FIG. 7, and the audio amplification circuit 13 is brought into a non-operating state.

Finally, the case where the changeover switches 40 and 41 are set to the constant operation mode will be explained. Changeover switch 40
The terminal voltage of the battery 19 is applied to the contact via the NAND circuit 23 via the diode 43.
The input becomes "H", and the output of the NAND circuit 23 becomes "L", making the transistor 52 conductive. Further, the input to the NAND circuit 26 becomes "H" through the diode 42, and the oscillation operation of the alarm sound oscillation means is stopped. Furthermore, the base of the transistor 61 becomes "H" and conducts through the diode 65, and the transistor 53 becomes conductive. Therefore, the receiving circuit and the audio amplifying circuit 13 are in an operating state regardless of whether or not an alert signal is transmitted.

In the embodiment shown in FIGS. 1 to 4, the transistor 21, which is a control means for supplying power to the audio amplification circuit 13, is controlled by the output of a NAND circuit 26, which constitutes an oscillation means for alarm sound. Although configured, the present invention is not limited to this, and control may be performed using the output of the output terminal b of the waveform shaper 17 and the output of the NAND circuit 28. In the embodiment shown in FIGS. 1 to 4 and the other embodiments shown in FIGS. 5 to 7, the oscillation output of the NAND circuit 26 is applied to the NF terminal of the audio amplifier circuit 13 to adjust the audio. Although the amplification output is configured to be amplified at a constant volume regardless of the adjustment of the device, the present invention is not limited to this, and any configuration may be used as long as it is configured to provide a constant amplification output. Furthermore, the intermittent operation oscillator and alarm sound oscillation means were constructed using NAND circuits 23 and 26, respectively.
Of course, it is not limited to this. Further, although the holding means is configured using the NAND circuits 28 and 37, it is needless to say that the holding means is not limited to this. Furthermore, if the audio demodulation circuit 5 is composed of an integrated circuit including a noise squelch operational amplifier and a squelch trigger circuit, the alert signal extractor 12
The waveform shapers 17 and 50 can be constructed using a noise squelch operational amplifier in an integrated circuit, and the waveform shapers 17 and 50 can be constructed using a squelch trigger circuit in an integrated circuit.

(Effects of the invention) As explained above, the weather report broadcast receiving device of the invention provides the following effects.

A changeover switch allows the receiver to be operated at all times in a constant operation mode, an instant mode in which the alarm sound is amplified while an alert signal is detected, and after an alert signal is detected until the changeover switch is operated. You can select and set any receiving device to the lock mode, which continuously amplifies the alarm sound. Furthermore, in the instant mode and lock mode, when the receiver is waiting for an alert signal to be detected, power is intermittently supplied to the receiver and the receiver is intermittently activated, reducing the amount of power consumed by the receiver when it is in standby mode. be done. For this,
The battery has a longer service life and needs to be replaced less frequently, making maintenance management easier.

Furthermore, in order to detect transmission of an alert signal while the receiving device is in a standby state, if the audio amplification circuit remains inactive and only the receiving circuit up to the audio demodulation circuit is intermittently activated, the audio amplification circuit can be activated. The amount of power consumed is lower than when the entire receiving device including the receiver is intermittently activated. Therefore, the service life of the battery becomes longer.

Furthermore, if the oscillation output of the alarm sound oscillation means is applied to the NF terminal of the audio amplifier circuit, the oscillation output of the alarm sound oscillation means is amplified and outputted at a constant amplification degree by the audio amplifier circuit. Therefore, even if the volume adjuster is set to the minimum volume position, the alarm sound is amplified from the speaker at a constant volume, and it is possible to reliably notify the user that a weather report has been broadcast or has been broadcast in the received sound.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram of one embodiment of the weather report broadcast receiving device of the present invention, and FIG.
FIG. 3 is a circuit diagram of a specific example of the alert signal extractor, rectifier, and waveform shaper shown in FIG. FIG. 4 is a time chart explaining the operation when set to instant mode, and FIG. 5 is a block circuit diagram of another embodiment of the weather report broadcast receiving device of the present invention. , FIG. 6 is a time chart explaining the operation when the reception mode of the receiving apparatus of the other embodiment shown in FIG. 5 is set to lock mode, and FIG. 7 is a time chart explaining the operation when set to instant mode. This is a time chart to explain. 5... Audio demodulation circuit, 12... Alert signal extractor, 13... Audio amplification circuit, 16... Rectifier,
17, 50... Waveform shaper, 19... Battery, 20, 21, 30, 52, 53, 57, 61
...transistor, 23, 26, 28, 37...
NAND circuit, 40, 41...changeover switch.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A weather report broadcast receiving device for receiving weather report broadcasts in which an alert signal containing a predetermined frequency is transmitted prior to transmitting the weather report,
intermittent operation control means for repeatedly supplying and cutting off power to bring the receiving device into an operating state intermittently; alert detecting means for detecting the alert signal in the operating state of the receiving device; alarm sound oscillation means; a changeover switch for setting a reception mode of the reception device, the changeover switch causes the reception device to operate intermittently until the alert signal is detected, and after the alert signal is detected, the changeover switch causes the reception device to operate intermittently until the alert signal is detected; A lock mode outputs an alarm sound until it is switched to another mode, an instant mode operates the receiver intermittently while the alert signal is not detected, and outputs an alarm sound while the alert signal is detected, and an instant mode outputs the alarm sound while the alert signal is detected. A weather report broadcast receiving device characterized in that the receiving device is configured to be selectively set to a constant operation mode in which weather information can be received at all times. (2) The intermittent operation control means repeatedly supplies and cuts off power to the receiving circuit up to the audio demodulation circuit to bring the receiving circuit into an intermittently operating state, and in the operating state of the receiving circuit, the alert detecting means A control means is provided for detecting the presence or absence of transmission of an alert signal and controlling the operation of the audio amplification circuit by supplying and cutting off power, and when the transmission of the alert signal is detected by the alert detection means, the output is inverted and the output is reversed. A holding means is provided to continue the inverted output even when the alert signal is no longer transmitted, and the intermittent operation control means operates the receiving circuit intermittently by the changeover switch until the transmission of the alert signal is detected. state and the control means makes the audio amplification circuit inactive, and when transmission of the alert signal is detected by the alert detection means, the output of the holding means is inverted, and this inverted output causes the receiving circuit to A lock mode in which the audio amplification circuit is activated, the alarm sound oscillation means is activated to oscillate, and the oscillation output is amplified and outputted by the audio amplification circuit, and the receiving circuit is activated while transmission of the alert signal is not detected. The audio amplification circuit is intermittently activated and the audio amplification circuit is inactivated, and even when the alert signal is detected by the alert detection means, the output of the holding means is not inverted, and the detection output of the alert detection means is used to an instant mode in which the receiving circuit and the audio amplifying circuit are put into operation only while an alert signal is being detected, and the alarm sound oscillating means is made to oscillate, and the oscillation output is amplified and outputted by the audio amplifying circuit; The reception mode is selectively set to a constant operation mode in which the reception circuit and the audio amplification circuit are activated and the oscillation operation of the alarm sound oscillation means is stopped, regardless of whether or not the alert signal is transmitted. 2. The weather report broadcast receiving device according to claim 1, wherein the weather report broadcast receiving device is configured as follows. (3) The weather report broadcast receiving device according to claim 1 or 2, characterized in that the oscillation output of the warning sound oscillation means is applied to the NF terminal of the audio amplification circuit.