JPS6084079A - Emergency alarm broadcast receiver - Google Patents

Abstract

PURPOSE:To attain the remote control of sound volume while separating an emergent alarm sound volume from a sound volume control circuit at channel switching by using a defeat pulse to reset an emergency alarm broadcast decoder circuit and to bring the state to the identical state as the end of discrimination. CONSTITUTION:An AFC (sound) defeat pulse generated from a channel selection circuit 6 is used at channel switching, said defeat pulse is fed to a base of a transistor (TR) 16 whose collector and emitter are connected between the reset terminal of a decoder circuit and ground so as to reset a decoder circuit 8 thereby bringing the state to the identical state as the discrimination of the end of an emergency alarm broadcast. Thus, an output of the decoder circuit 8 goes to a low level at channel switching, the sound variable resistor 15 is separated and a sound volume control circuit 12 is operated by a DC voltage at a terminal 14. Since the voltage at the terminal 14 is changed by the sound volume control operation, the channel is switched and also the sound volume is adjusted by the operation of a remote control transmitter.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an emergency warning broadcast receiving apparatus using a television receiver.

Conventional structure and its problems Currently, broadcasting stations transmit information such as predictions of major earthquakes and tsunami warnings that have a direct and serious impact on human life and social life.
A system is being put into practical use that allows a television receiver to automatically turn on even if it is turned off so that the emergency broadcast can be received. Fig. 1 shows an example of the configuration of a conventional emergency warning broadcast system. In Fig. 1, 1 is a tuner, 2 is a video intermediate frequency amplification/detection circuit, 3 is an audio detection circuit, 4 is an audio amplification output circuit, and 6 is an audio amplification output circuit. A speaker and a channel selection circuit 6 constitute a television receiver. Reference numeral 7 denotes a power supply circuit, and power is always supplied to each of the above-mentioned circuits from this power supply circuit 7 regardless of whether the power switch of the television receiver is turned on or off, so that the state is set at the time of receiving the emergency warning broadcast. The above audio detection circuit 3
An audio detection signal is outputted from the output terminal of and supplied to the emergency warning broadcast decoder circuit 8 and the audio amplification output circuit 4, respectively. The emergency warning broadcast decoder circuit 8 is composed of a demodulation circuit for converting the FSK signal into a binary signal and a code discrimination circuit for this binary signal, and when an emergency warning broadcast is received, its output becomes high level. The output end of the emergency warning broadcast decoder circuit 8 is connected to an audio output stage power supply control circuit 9. Terminal 1Q is a flyback transformer (not shown)
The terminal 10 is connected to the supply end of the electrical power produced by the terminal 10, so that a voltage is applied to this terminal 10 when the power switch of the television receiver is closed. The audio output stage power control circuit 9 takes the logical sum of the output of the emergency warning broadcast decoder circuit 8 and the terminal 10, and outputs the result when the power switch of the television receiver is turned on or when an emergency warning broadcast is received. generates and acts to close the switch circuit 11. The switch circuit 11 includes a power supply circuit 7 and an audio amplification output circuit 4.
Therefore, when the audio output stage power supply control circuit 9 generates an output at t'L, power is supplied to the audio amplification output circuit 4 and the speaker 6 sounds. This allows viewers on television receivers to listen to the emergency warning broadcast.

In such a device, it is desirable that the volume of the emergency warning sound can be adjusted in the same way as the sound of normal television broadcasting. For example, a user may want to adjust the volume depending on the content of an emergency warning broadcast. Therefore, a method as shown in FIG. 2 has been proposed. In FIG. 2, the same parts as in FIG. 1 are designated by the same numbers. In Figure 2,
An F6 amount control circuit 12 is inserted between the audio detection circuit 3 and the audio amplification output circuit 4, and a volume-controlled audio output is applied to the audio amplification output circuit 4. The volume control circuit 12 controls the volume using the DC voltage from the volume control switching circuit 13.The volume control circuit 12 uses the output of the emergency warning broadcast decoder circuit 8 of the volume control switching circuit 13 to control the volume using the DC voltage from the volume control switching circuit 13. A digital-to-analog converter (not shown), which is controlled by a digital-to-analog converter (not shown), switches between the output voltage applied to the terminal 14 and the midpoint voltage of the emergency alarm iM quantity volume 16. When a broadcast is received, the volume is set at the emergency warning sound volume volume 16 regardless of the state of the output voltage of the terminal 14.

Therefore, according to this configuration, it is possible to adjust the volume of the emergency warning sound by adjusting the volume 16, but in actual use, it is necessary to place the volume 16 in front of the television receiver. If the user accidentally sets the sound volume 16 to the lowest setting, the problem is likely to arise that the emergency broadcast cannot be heard even though the emergency IF broadcast is being received. Therefore, the volume volume is 16
It is preferable that the alarm is located inside the television receiver so that it cannot be easily touched, and that the volume is set to a value close to the maximum so that the emergency alarm sound can be reliably heard.

Here, if the channel is changed while the emergency alarm sound is being output, the decoder circuit 8 that has determined the start signal of the emergency 11 alert broadcast will continue to operate unless the end signal is determined 91J, and its output will be... In order to maintain ), and when trying to reduce the amount of 14, the television receiver 1
It is inconvenient to have to operate the volume volume 16 when the user is close to the computer, and the remote control device cannot be used effectively.

OBJECTS OF THE INVENTION In view of the above drawbacks, the present invention aims to bring the operation of the emergency warning broadcast decoder circuit into the same state as the end judgment at the same time as channel switching. The emergency warning broadcast decoder circuit is reset using the Tiffit pulse that is generated before the end of the emergency warning broadcast, and therefore, according to the present invention, the emergency warning sound volume can be controlled at the time of channel switching. It can be disconnected from the circuit, and the volume can be remotely controlled to the desired level using a remote control transmitter.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. Third
In the figures, the same parts as in FIGS. 1 and 2 are given the same numbers, and detailed explanations are omitted. In this device, an AFC (audio) defeat pulse generated from the channel selection circuit 6 is used when switching channels, and the defeat pulse is applied to the base of a switching transistor 16 whose collector emitter is connected between the reset terminal of the decoder circuit 8 and the ground. is added to make the transistor 16 conductive, and the decoder circuit 8 is reset to the same state as the end determination of the emergency warning broadcast. Therefore, when switching channels, the output of the decoder circuit 8 becomes low level, the volume volume 15 is disconnected, and the volume control circuit 12 is connected to the terminal 14.
[It will operate based on the applied DC voltage.] Since the voltage at this terminal 14 changes depending on the volume control operation of the remote control transmitter, the volume can be adjusted to the desired level by switching channels and operating the volume adjustment button on the remote control receiver. I can do it. Although not shown, the remote control receiver is also constantly supplied with power supply voltage by the power supply circuit 7, regardless of whether the television receiver is turned on or off.

In addition, the power is supplied to the audio amplification output circuit 4 because the voltage appears at the terminal 10 due to the operation of the television receiver, so the switch circuit 11 remains closed, and the power supply circuit 7 continues to supply power to the audio amplification output circuit 4. Supplied by

FIG. 4 shows the detailed configuration of the decoder circuit 8.

The frequency of the FSK signal is 1024t (mark ゛°1°')
z.

The space "0°" is sent as 640t (z, but
The audio detection output of the television receiver is 640) (z
, 1024Hz Pandopa, X 7 I #ri (J3
PF) 81.82 for selective amplification and the next detection circuit 83.8
4, and the output is compared by a comparison/waveform shaping circuit 86 to convert the FSX signal into a binary signal of O", '1°', and the next code discrimination microcomputer 86 is used for emergency warning broadcasting. Start and end determinations are made. When the start of emergency warning broadcasting is determined, its output becomes high level, and the end is determined /D J' ((7) The output becomes low level. This code discrimination microcomputer 8
Defeat pulse and transistor 16 for 6
A series reset is performed by turning on the transistor 16 using the 16-bit signal, and the code discriminating microcomputer 86 is placed in the same state as the end judgment of the emergency f-alarm broadcast. The decoder circuit is reset using the defeat pulse and its state is the same as the end judgment of the emergency warning broadcast (by doing so, the emergency warning volume adjustment volume is disconnected from the audio circuit system when switching channels +?) - Part 7'
+ The transmitter allows you to adjust the volume to your preference, which is extremely convenient in practice.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of an emergency warning broadcast receiving device, FIG. 2 is a block diagram of the main parts of the device that allows emergency warning sound volume adjustment 75, and FIG. 3 is an embodiment of the present invention. Block diagram of emergency warning broadcast receiving device in example, No. 4
The figure is a block diagram showing a specific configuration of a decoder circuit. 1...Tuner, 2...Intermediate frequency amplification/synchronization circuit, 3...Audio detection circuit, 4...
...Audio amplification output circuit, 5...Speaker, 6.
...Tuning selection circuit, 7...Power supply circuit, 8...
... Emergency warning broadcast decoder circuit, 9 ... Audio output stage power supply control circuit, 11 ... Switch circuit,
12...Volume control circuit, 13...Volume tffll + wholesale switching circuit, 16...Emergency warning broadcast volume volume, 16...Switching transistor. Name of agent: Patent attorney Nakao (man) and 1 other person (1st)
Figure 2/

Claims (1)

[Claims] A power supply means that constantly supplies power to at least a tuner, a channel selection circuit, a video intermediate frequency amplification/detection circuit, an audio intermediate frequency amplification/detection circuit, and a volume control circuit regardless of whether the television receiver is turned on or off; An emergency warning broadcast reception decoder circuit to which power is supplied by the power supply means, and a signal generated when the television receiver operates or a signal output from the decoder circuit when receiving the emergency warning broadcast are received by the power supply means. means for controlling the supply of power from the source to the audio amplification output circuit, means for generating a voltage for controlling the volume of the television receiver +11J, means for generating a voltage for controlling the volume of the emergency warning sound, and the above-mentioned decoder circuit when receiving an emergency warning broadcast. The metering control voltage generating means for the Toi emergency LIF alarm is connected to the volume control circuit according to the output signal, and at other times, the volume control voltage generating means of the television receiver is connected to the volume control circuit. and a means for resetting the decoder circuit in response to an output generated every time the channel selection circuit is operated to select a station, and bringing the decoder circuit into the same state as the end determination of the emergency warning broadcast. Alarm broadcast receiving device 0