JPS5917886B2 - ONLY YOUSEIGYOSOUCHI - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a volume control device for a television receiver or the like. In a remote control volume control device for a television receiver,
To temporarily clear the preset volume,
A mute circuit is used to reduce the audio output to zero. This means that by operating the mute switch on the remote control volume control device, the audio output will be set to zero (silence) regardless of the volume setting position, and when the mute switch is operated again, the volume will be set according to the volume. It is a convenient device that can be operated while talking on the telephone, etc. However, conventional volume control devices do not allow
Next, even when the power is turned on, the audio output remains muted due to the mute circuit being activated and no volume is emitted. For this reason, the operator may feel that there is a malfunction, or may be surprised when a loud volume is emitted when the mute circuit is released after operating the volume up switch to increase the volume level while the volume is being erased. Baatatsuta. Therefore, an object of the present invention is to provide a volume control device that can solve the above-mentioned problems. In summary, the volume control device of the present invention is configured so that the volume erasing state is canceled in response to the power supply 5 being turned on. FIG. 1 is a block diagram of one embodiment of the volume control device of the present invention. That is, the transmitter 1 of the remote control device has 00 operation buttons 2, 3, and 4 for volume increase, volume decrease, and mute.
has. The transmitter 1 may have operation buttons for channel switching, power on/off, etc. Transmitter 1
By operating each operation button 2, 3, 4, a specified signal is generated and transmitted as ultrasonic waves, light, etc. 5
be done. These signals are converted into electrical signals by the receiving element 5, amplified to a predetermined size by the amplifier 6, and detected and discriminated circuits 7, 8, and 9 discriminate the volume increase, volume decrease, and mute signals, respectively. The output terminal of the miute discrimination circuit 9 is connected to the trigger terminal T of the flip-flop circuit 10, and whenever the trigger terminal T is applied with the "month", the output of the output terminal Q is "month" or ". "O" sequentially. The volume increase and volume decrease discrimination circuits 7 and 8 are respectively connected to a volume increase terminal a and a volume decrease terminal of a volume switching circuit 11 constituted by a motorized volume, a ring counter, a bi5nary counter, or the like. The volume switching circuit 11 responds to the operation of the volume increase and volume decrease operation buttons 2 and 3 of the transmitter 1 to switch each terminal A of the volume switch circuit 11.
, b is applied, and an output voltage for switching the volume continuously or stepwise appears at output terminal c.
Switches 12 and 13 are connected to the volume switching circuit 11,
It is connected to the power supply +B through a resistor 14. Therefore, by closing the switches 12 and 13, the same operation as operating the operation buttons 2 and 3 of the transmitter can be performed. Increased volume,
The outputs of the volume reduction discrimination circuits 7 and 8 are connected to the input terminal of the OR circuit 15. Further, the output terminal a of the power supply detection circuit 16 is also connected to the input terminal of the OR circuit 15. Power supply detection circuit 16
The input terminal b of is connected to the power supply +B. Power supply detection circuit 1
A circuit diagram of No. 6 is shown in FIG. That is, C is a capacitor connected between terminals A and b. R1 is a resistor and is connected between terminal b and ground. When power is applied to input terminal b, output terminal a receives a power detection pulse “1”.
” appears instantly. This state is shown in FIG. Third
Figure A shows the voltage waveform at input terminal b, and Figure 3B shows the voltage waveform at output terminal a. In this way, when the power supply +B is applied, the output pulse "1" of the voltage detection circuit 16 is applied to the OR circuit 15. The output of the OR circuit 15 is connected to the reset terminal R of the flip-flop circuit 10. When a voltage "1" is applied to the reset terminal R, the output Q of the flip-flop circuit 10 is forced to

It is designed to indicate [0]. The output c of the volume switching circuit 11 and the output Q of the flip-flop circuit 10 are connected to an input terminal a and a control terminal g of a gate circuit 17, respectively. The output b of the gate circuit 17 is applied to the volume control terminal c of the volume amplifier 18. When the output of the volume switching circuit 11 is present, substantially the same potential appears at the output b of the gate circuit 17 when the control terminal g of the gate circuit 17 is "O". When the control terminal g is "1", a voltage for minimizing the amplification factor of the volume amplifier 18 appears at the output b regardless of the presence or absence of the output voltage of the output c of the volume switching circuit 11. A speaker 19 is connected to the output terminal of the volume amplifier 18 to generate sound. A circuit diagram of the gate circuit 17 is shown in FIG. That is, the control terminal g is connected to the transistor T2.
The input terminal a is connected to the base of the transistor T1 through a resistor R3. The collector of transistor T2 is connected to the base of T1, and the emitter of T2 is grounded. The power supply +B is connected to the collector of the transistor T1, and the emitter is connected to the output terminal b and the resistor R
2 and is grounded. When voltage V is applied to terminal a, when [0] is applied to terminal g, transistor T
2 is turned off and the transistor T1 is turned on, and if the base-emitter voltage drop VBE of the transistor T1 is ignored, a voltage V appears at the terminal b. On the other hand, when "1" is applied to the terminal g, the transistor T2 is turned on and the base of the transistor T1 is grounded, so the transistor T1 is turned off and no output voltage appears at the output b. With this configuration, when the Mute operation button 4 is pressed, an output "1" is generated in the Mute discrimination circuit 9,
The output Q of the flip-flop circuit 10 becomes "1", and regardless of the output voltage of the volume switching circuit 11, a voltage for minimizing the volume appears at the output b of the gate circuit 17, and the volume is erased. In this case, the volume increase/volume decrease operation button 2,
When 3 is pressed, output "1" is generated in the discrimination circuits 7 and 8, which resets the flip-flop circuit 10 via the OR circuit 15, so that the output Q of the flip-flop circuit 10 becomes "1".
0'', the output voltage of the volume switching circuit 11 appears as is at the output b of the gate circuit 17, and the voltage for minimizing the volume no longer appears. That is, the volume erased state is released. This also applies when switches 12 and 13 are turned on. Also, when the power +B is turned on in the volume erase state, the power supply detection circuit 16 outputs "1".
'' occurs, which resets the flip-flop circuit 10 via the OR circuit 15, so that the volume erased state is canceled by the same operation as described above. As described above, according to the present invention, the volume erasing state is canceled in response to power-on, so that various troubles can be solved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a circuit diagram of a power supply detection circuit, FIG. 3 is a diagram explaining its operation, and FIG. 4 is a circuit diagram of a volume switching circuit. 7...Volume increase discrimination circuit, 8...Volume decrease discrimination circuit, 9...Mute discrimination circuit, 10...Flip-flop circuit, 11...Volume switching circuit, 15...OR circuit, 16. ...Power supply detection circuit, 17...Gate circuit, 18...Voice amplifier, 19...Speaker.

Claims (1)

[Claims] 1 audio output means for amplifying and outputting an input audio signal; control signal generation means for generating a control signal for temporarily erasing the audio output from the audio output means; a sound erasing means that stops the operation of the sound output means and erases the sound when detected; a power supply detection means that detects turning on of power to the sound output means;
and means for canceling the operation of the sound erasing means and operating the sound output means again in response to the detection output of the power supply detection means.