JPS6325810Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a remote control device equipped with a means for generating a remote control response sound for a television receiver, etc., and an object of the present invention is to provide a device that prevents the generation of response sound when the power is turned on. do.

When operating a TV receiver by remote control, check whether the remote control control signal has reached the TV receiver and is operating.
Normally, you would not be able to tell unless you were looking at the television receiver, so this had the disadvantage that it was difficult to operate as it required you to look at your hand to operate it.

Therefore, in order to improve this drawback, there is a system that is configured to generate a response sound (a signal of about 3KHz) from the TV receiver's speakers when the remote control control signal reaches the TV receiver and operates. it was thought. In this way, the operator only needs to look at the remote control's handheld part, and by listening to the response sound generated from the television receiver, the operator can confirm that the remote control control signal has arrived and the operation has started. It is very convenient to check.

As a signal for generating such a remote control response sound, there are cases where a remote control control signal is directly used, and cases where a signal obtained by processing the remote control control signal is used. If it is desired to generate a response sound only when switching channels, the system may be configured such that the response sound is generated by processing the remote control signal and using a signal that is output only when switching channels as a trigger signal.

For example, when switching channels, an AFC daily pulse is generated, but if this pulse is used to operate an oscillation circuit such as an unstable multivibrator for a certain period of time, when switching channels using remote control, A response tone is generated. However, in this case, since the AFC defective pulse is generated even when the power is turned on, there is a drawback that a response sound is generated even when the power is turned on.

Therefore, it is an object of the present invention to provide a device that eliminates these drawbacks.

Hereinafter, the present invention will be described in detail with reference to the drawings showing one embodiment thereof. FIG. 1 shows a circuit diagram of an embodiment of the present invention, and FIG. 2 shows waveform diagrams of various parts for explanation.

In Figure 1, a is the input terminal for the AFC daily pulse generated when receiving the remote control control signal, b is the Vcc (12V) power supply terminal,
C is an output terminal for an oscillation signal for generating a response sound from the astable multivibrator, and this oscillation signal is applied to the audio amplifier circuit of the audio section, and a response sound is emitted from the speaker. When switching channels by remote control, input terminal a
A positive AFC day-to-day pulse is applied. When this AFC defective pulse is applied, the emitter follower connected transistor
It is integrated by capacitor C ₁ on the emitter side of TR ₁ , and is slightly delayed from the audio dayfeet period.
Then, it is converted into a pulse with a fixed period width. Therefore, when this AFC defective pulse is input, the base of the transistor TR ₂ is at a high level for a certain period of time, and the transistor TR ₂ is turned on.

As a result, the astable multivibrator AM consisting of transistors TR ₃ and TR ₄ operates, and the collector of transistor TR ₄ has resistors R ₆ , R ₇ ,
An oscillation pulse signal with a time constant determined by capacitors C ₂ and C ₃ is output.

This oscillation frequency should be selected to be approximately 3KHz.
With the above circuit, when the channel is switched by remote control, the output terminal c will be output at approximately 3KHz.
An oscillation signal is generated, and a response sound is generated.

Next, when the power is turned on, an AFC defective pulse is also generated and applied to the input terminal a, and this pulse has a length of about 100 msec. Therefore,
In this circuit, a circuit consisting of a transistor TR ₅ , a voltage regulator diode D ₁ , a capacitor C ₄ , and a resistor R ₉ is used, and the transistor TR ₅ is switched later than the rise of the power supply voltage, and the voltage regulator diode D ₁ is switched later than the rise of the power supply voltage. By delaying the start of supplying power to the unstable multivibrator, response sound is prevented from being generated when the power is turned on.

As shown in Fig. 2A, this power supply terminal b has
12V power is applied from the time the power is turned on.

On the other hand, when the power is turned on, the AFC day-to-day pulse is also generated as shown in Fig.
Within 100msec. Therefore, the rise of the power supply voltage A is integrated and delayed by the resistor _R9 and the capacitor _C4 , and is applied to the base of the transistor _TR5 for switching _. Therefore, the constant voltage diode D ₁ is made not to conduct until a constant voltage is reached.

In this way, the power supply voltage to the power line of the non-multivibrator AM will be applied with a delay of more than 100 msec after the power is turned on, as shown in Figure 2 (c), and even if an AFC day-to-day pulse is generated when the power is turned on. Non-multivibrator AM does not oscillate, eliminating the possibility of remote control response sound being generated.

As described above, according to the present invention, it is possible to obtain a practical device that does not erroneously generate a remote control response sound when the power is turned on.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a remote control device according to an embodiment of the present invention, and FIG. 2 is a waveform diagram of each part thereof. a...AFC day-to-day pulse input terminal, b
...Power supply terminal, c...Oscillation signal output terminal, AM...
…astable multivibrator, TR ₅ …transistor, D ₁ …diode, R ₉ …resistor, C ₄ …
capacitor.

Claims (1)

[Scope of utility model registration request] A series circuit consisting of a transistor and a constant voltage diode is provided with an oscillation circuit for generating a response sound when a remote control signal is received, and the power supply voltage is switched from the power supply terminal with a delay from the rise of the power supply voltage. The power supply terminal is connected to one end of the transistor, the other end of the transistor is connected to one end of the voltage regulator diode, and the other end of the voltage regulator diode is connected to the power line of the oscillation circuit. A remote control device characterized in that a resistor and a capacitor are connected to the power supply terminal and the base of the transistor for switching the transistor with a delay from the rise of the power supply voltage at the power supply terminal.