JPS616986A - Power supply control system for television sound multiplex adaptor - Google Patents

Abstract

PURPOSE:To turn on/off a power supply of adaptor side in interlocking with on/off at the main body side of a receiver by superimposing a control signal on a sound multiplex signal of the receiver main body side, outputting the result, allowing the adaptor side to detect the control signal in the output and turning on the power supply of the adaptor side. CONSTITUTION:When a main power switch 9 of the television receiver main body 1 is turned on, a power voltage +B is led, an output of a control signal oscillating circuit 12 is superimposed on a sound multiplex signal at a sound output circuit 11, the result is led to a sound output terminal 4 and fed to a sound multiplex decoder circuit 13 and a control signal detecting circuit 16 at the sound multiplex adaptor 2 from the sound input terminal 5. Then the circuit 16 detects the presence of the control signal, an H level output is led, then a transistor Q1 of a switching circuit 17 is turned on, a relay RL ie excited, an AC input is supplied to a main power supply circuit 14, the power voltage +B1 is led from the circuit 14 and the circuit in the adaptor 2 is driven.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a power control system for a television audio multiplex adapter.

<Background Art> Generally, there are various types of receivers that receive television audio multiplex broadcasts. One of these is a built-in television receiver that has an audio multiplex decoder circuit built into it, but this has the disadvantage that the receiver is very expensive. Therefore, the audio multiplexing decoder circuit was separated from the TV receiver body to create an audio multiplexing adapter.

There are commercially available devices in which the audio multiplex output terminal attached to the television receiver body and the input terminal of the audio multiplex adapter are connected using a cable.

By the way, the audio multiplexing adapter used in the latter case only functions when used in combination with the television receiver itself, and the adapter alone cannot perform its function at all.

However, since the power supply circuit of such an audio multiplexing adapter is usually installed independently from the power supply circuit of the TV receiver, its power supply circuit is linked to the power on/off operation of the TV receiver. It was necessary to turn on and off the power on the adapter side each time. When making a decision, I turned off only the power to the receiver, and sometimes forgot to turn off the power to the adapter.

<Purpose> The purpose of the present invention is to completely eliminate such drawbacks of the conventional technology. To provide a power supply control system for a TV audio multiplex adapter that can automatically control on/off the main power supply on the adder free side in conjunction with the on/off control of the power supply.

<Examples> The present invention will be described below according to examples shown in the drawings. The drawing shows a circuit configuration diagram of one embodiment of the present invention, and in the drawing, 1 is a television receiver body, 2 is an audio multiplex adapter, and 3 is an audio output terminal 4 of the receiver body l and an audio input of the adapter 2. It is a cable connecting terminal 5, 6 is an antenna, 7 is a remote control signal transmitter, and 8a
, 8b indicates a speaker. Here, only the parts of the television receiver body 1 and the audio multiplexing adapter 2 that are particularly relevant to the system of the present invention are shown, and other parts are omitted.

That is, the main body of the television receiver] [wherein 9 is a main power switch, 10 is a power supply circuit, and 11 is an audio output circuit, which are the same as those normally built in a general television receiver. Here, in particular, a control signal oscillation circuit +2 is provided in the main body of an ordinary television receiver l to control the power supply on the adder free 2 side, and in this oscillation circuit 12, a specific frequency f+ (however, when the main power switch 9 of the receiver is turned on) is This frequency is selected to be outside the band of the TV audio multiplexed signal, for example, 50kl-1z or higher), and this control signal is superimposed on the audio multiplexed signal in the audio output circuit 11 to output the audio. It is designed to be led out to terminal 4.

On the other hand, in the audio multiplexing adapter 2, 13 is an audio multiplexing decoder circuit, 14 is a main power supply circuit, and 15 is a main power switch, which are also not particularly different from those normally built in a general adapter. Furthermore, here, the detection circuit is comprised of a control signal detection circuit 16 that detects the presence or absence of a control signal (frequency component element +) supplied from the television receiver main body via a cable 3, a switching transistor Q, and a relay RL. On/off based on the output of 16
The audio multiplex adapter 2 is constructed by adding a switching circuit 17 which is controlled to be turned off, and a sub power supply circuit 18 consisting of a Zener diode D1, a diode D2, a low resistance resistor R1, R2, and a capacitor C1.

In the audio multiplexing adapter 2 configured as described in Section 2, when the main power switch 15 is turned on, a power supply voltage of 1B2 is derived from the sub power supply circuit 18, and this is applied to the control signal detection circuit 16 and the switching Transistor Q+VC of circuit 17 is supplied. However, in this case, if the main power switch 9 on the TV receiver main body 1 side is in the off state, all the circuits in the main body are stopped, so there will be no output signal from the audio output terminal 4 on the receiver main body side. Not derived. Therefore, in this case, the control signal detection circuit 16 on the adapter 2 side
Since the control signal is not detected and its output is at the "L" level, the transistor Q of the switching circuit 17 is in the cutoff state, and therefore the relay RL is also in the off state. Therefore, the main power circuit 14 in the adapter 2 is
The C input is not supplied, and therefore, at this time, most of the circuits in the adapter 2, including the audio multiplex decoder circuit 13, are not supplied with the power supply voltage 0Bl and are in a stopped state.

However, if the main power switch 9 on the TV receiver main body 1 is turned on in this state, the power supply circuit 10 is activated and a power supply voltage of 1 B is derived, and the audio output circuit 11 and control are accordingly activated. Each circuit in the receiver body including the signal oscillation circuit +2'z is driven, and the control signal oscillated in the control signal oscillation circuit 12 is superimposed with the audio multiplexed signal in the audio output circuit 11 and guided to the audio output terminal 4. . The audio multiplex signal on which the control signal is superimposed is supplied via the cable 3 from the audio input terminal 5 to the audio multiplex decoder circuit 13 and control signal detection circuit 16 on the audio multiplex adapter 2 side. At this time, the control signal detection circuit 16 detects the presence of the control signal and outputs an 'H' level output, which turns on the transistor Q of the switching circuit 17 and energizes the relay RL. AC input is supplied to the main power supply circuit I4 which is not connected to the main power supply circuit 14, and the power supply voltage voltage B1 is derived from the main power supply circuit 14. As a result, each circuit in the adapter 1 including the audio multiplex decoder circuit 13 is driven. The audio output is supplied to the external speakers 8a+'8b, and the TV audio multiplex broadcast is thus properly received.

However, during the reception operation of such audio multiplex broadcast,
When the main power switch 9 of the television receiver body 1 is turned off, the operation of each circuit on the receiver body 1 side is stopped, and the control signal and the audio multiplex signal are no longer output to the audio output terminal 4. Therefore, in this case, even if the main power switch I5 on the adapter 2 side remains in the on state, the output of the control signal detection circuit I6 is at the "L" level at this time, so both the transistor Q1 and the relay RL are turned on. The main power supply circuit 14 is turned off, and no AC input is supplied to the main power supply circuit 14. As a result, most of the circuits except for some circuits on the adapter 2 side are stopped, and the power is substantially turned off.

In this way, in this embodiment, the audio multiplexing adapter 2 is activated in conjunction with the on/off operation of the main power switch 9 of the television receiver body 1.
Without turning on/off the main power switch 15 on the side,
The main power switch 15 on the adapter side is always on and by turning on/off the main power switch 9 on the receiver main body side, it becomes possible to substantially control on/off the power supply on the adapter side. Of course, if necessary, such as when going out for a long period of time, by turning off the main power switch +5' on the adapter side, the power to all circuits in the adapter can be completely turned off.

Although the above embodiment has been explained on the assumption that the main power switch 9 on the side of the receiver body 1 is manually turned on and off, this main power switch 9 or the power supply circuit I
Operation of O If the on/off control is controlled by the transmission signal from the external remote control signal transmitter 7 using a well-known method, this remote control signal transmitter 7 can control the audio in conjunction with the TV receiver main body 1 side. It becomes possible to perform substantial on/off control of the power supply on the multiplex adapter 2 side.

Effects> As described above, according to the method of the present invention, even when the TV receiver main body and the audio multiplexing adapter are connected via a cable, it is not necessary to turn on and off the power on the receiver main body side. At the same time, the main power supply on the adapter side is automatically turned on/off without having to turn on/off the power supply on the adapter side, thereby significantly improving operability.

[Brief explanation of the drawing]

The drawing is a circuit configuration diagram of one embodiment of the system of the present invention. 1...TV receiver body, 2 Audio multiplex adapter, 3
... Cable, 4 Audio output terminal, 5... Audio input terminal, 12 Control signal oscillation circuit, 13 Audio multiplex adapter, 16... Control signal detection circuit, 17 - Switching circuit.

Claims (1)

[Claims] 1. In a device that connects the audio input terminal of a TV audio multiplex adapter to the audio output terminal of a TV receiver body via a cable, a control signal having a specific frequency component outside the audio multiplex signal band is inserted into the receiver body. A control signal oscillation circuit that oscillates is provided, and the control signal oscillated by this oscillation circuit is superimposed on the audio multiplex signal and supplied to the audio multiplex adapter side from the audio output terminal. A control signal detection circuit is provided to detect the presence or absence of a supplied control signal, and a switching means is provided to control the main power supply on the adapter side on and off based on the detection output of this detection circuit, thereby turning on the power supply on the television receiver side. - A power control system for a TV audio multiplex adapter, characterized in that the power supply on the audio multiplex adapter side can be controlled on and off at the same time in conjunction with the off operation.