JPS6244729B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a receiver control device for selectively activating a plurality of receivers, such as a radio receiver and a television receiver, to receive broadcasts.

Traditionally, for example, when a radio receiver is receiving radio broadcasts and a television receiver is trying to receive television broadcasts, the radio receiver is first disabled, and then the television receiver is turned off. The radio receiver is activated to select channels for television broadcasts. Therefore, the operation is troublesome. Particularly when a car is equipped with a radio receiver and a television receiver,
Such troublesome operations pose a big problem.

Prior art techniques for solving such problems are shown in, for example, Japanese Utility Model Publication No. 54-40746, Japanese Patent Publication No. 51-20850, and Japanese Patent Application Laid-open No. 52-16910. It is configured to be operated selectively by operation.

A new problem with the prior art is that multiple receivers must be powered on at all times, resulting in high power consumption and complex configurations. have.
An object of the present invention is to provide a receiver control device that prevents wasteful power consumption and has a simplified configuration.

The present invention includes a push-button type tuning switch and a phase lock loop circuit, and when the phase lock loop is in an unlocked state, a plurality of receivers outputting mute signals, and the tuning switch of a predetermined receiver is configured to a first circuit that detects that the receiver has been operated; a second circuit that detects that the mute signal is output; and a receiver that has been operated is identified based on the first circuit and the second circuit. , a third activating the receiver.
This is a receiver control device characterized by comprising a circuit.

FIG. 1 is a block diagram of one embodiment of the present invention. Television receiver 1 and radio receiver 2
is installed in cars. A television broadcast image received by the television receiver 1 can be received by the cathode ray tube 3. Furthermore, the audio of the television broadcast and the audio of the radio broadcast received by the radio receiver are transmitted to the amplifier 4.
and can be heard from the speaker 5. The television receiver 1 and the radio receiver 2 are activated by being selectively supplied with power from a power supply 6 via a switching relay switch 8 of a relay 7. The television receiver 1 and the radio receiver 2 each include a phase loop frequency synthesizer. The television receiver 1 has channel selection switches S11, S12,...,S.
1n, and these tuning switches S11, S1
2, . can. These tuning switches S11, S12,...,
Setting a predetermined tuning frequency within the television receiver 1 by operating S1n is well known to those skilled in the art. Also connected to the radio receiver 2 are channel selection switches S21, S22, . . . , S2m. These tuning switches S21, S2
2, ..., S2m individually correspond to predetermined tuning frequencies of radio broadcasts, and by operating these tuning switches S21, S22, ..., S2m, the stored radio broadcasts It is possible to select and receive the tuned frequency. The television receiver 1 sends a signal on line 9 when the phase lock loop is unlocked when selecting a channel.
Outputs logic "1". The radio receiver 2 outputs a logic ``1'' to the line 10 when the phase lock loop is in the unlocked state at the time of tuning.
The signals output on lines 9 and 10 remain at logic ``1'' until the phase lock loop is stably locked, i.e. until the preselected tuning frequency is received. When the selected broadcast is stably received, the logic becomes "0". Such signals on lines 9 and 10 are known as MUTE signals.

While receiving a radio broadcast, power from the power source 6 is applied to the radio receiver 2 through one individual contact 11 of the relay switch 8, and the radio receiver 2 is activated. Therefore, at time t1, the channel selection switches S11 and S1 of the television receiver 1 are
2,...,S1n, for example, the channel selection switch S1
Assume that 1 is pressed. The outputs from the tuning switches S11, S12,..., S1n are as follows:
It is input to the monostable circuit 13 via the AND gate 12. By operating the channel selection switch S11, a signal having the waveform shown in FIG. 2 is input to the monostable circuit 13. Monostable circuit 13 produces an output on line 14 as shown in FIG. this
The AND gate 12 and the monostable circuit 13 constitute a first circuit that detects that the channel selection switches S11, . . . , S1n are operated. The television receiver 1 performs a channel selection operation by operating the channel selection switch S11, and in the unlocked state, outputs the mute signal shown in FIG. 2 to the line 9. In this way, when the television receiver 1 is not receiving a television broadcast, outputs are derived from the channel selection switches S11, S12,..., S1n, and a mute signal is derived from the line 9. Some circuits within the television receiver 1 are powered. The mute signal from line 9 is input to monostable circuit 16 via OR gate 15. The output from monostable circuit 16 is shown in FIG. This OR gate 1
5 and the monostable circuit 16 constitute a second circuit that detects that a mute signal is output. The output from the monostable circuits 13 and 16 is the NAND gate 1.
7 is input. The flip-flop 18 is
It is set in response to a falling output from NAND gate 17, making transistor 19 conductive. Therefore, the relay coil 20 of the relay 7 is energized, and the relay switch 8 is switched to the other individual contact 21 and becomes conductive. In this way, power is supplied from the power supply 6 to the television receiver 1 via the individual contacts 21 of the relay switch 8, and the television broadcast having the tuning frequency corresponding to the channel selection switch S11 is received and the image is displayed on the cathode ray tube 3. is obtained, and audio is output from the speaker 5. This NAND gate 1
7. Identifies the operated receiver using the flip-flop 18, transistor 19, relay circuit 7, NAND gate 22, and inverting circuit 23, which will be described later;
A third circuit is configured to activate the receiver.

During reception of television broadcasting, at time t2, the channel selection switches S21, S22,
. . , S2m, for example, the channel selection switch S21 is operated. The output from the channel selection switch S21 is shown in FIG. 25. The radio receiver 2 starts a tuning operation, and a mute signal is output to the line 10 in the unlocked state. This mute signal on line 10 is shown in FIG. 26. As a result, the monostable circuit 16 becomes
Output is derived to NAND gate 22. The signal derived from the monostable circuit 13 via the line 14 is at a low level, and the high level signal inverted by the inverting circuit 23 is input to the NAND gate 22. Flip-flop 18 is NAND gate 2
2, thereby resetting flip-flop 18 and causing transistor 19 to conduct. Therefore, the relay coil 26 of the relay 25 is energized, one relay switch 27 is turned on, and the other relay switch 28 is turned off. The radio receiver 2 receives a radio broadcast having a tuning frequency corresponding to the tuning switch S21, and a signal representing the tuning frequency is inputted from the line 31 via the relay switch 27 to the display 29. The display 29 visually displays the tuned frequency of the radio broadcast being received by the radio receiver 2.

When the television receiver 1 is receiving television broadcasts, the flip-flop 1
8 is in the set state, and the transistor 24 is cut off. Therefore, relay switch 27 is closed and relay switch 28 is conductive.
A clock signal from oscillator 30 is input to display 29 via line 32 and relay switch 28 . The display 29 receives a clock signal from the oscillator 30 and displays the time.

Although the above embodiment describes the switching operation between a television receiver and a radio receiver, in other embodiments of the present invention, selection of a plurality of radio receivers and selection of a plurality of television receivers is performed. and such embodiments are also to be construed as falling within the scope of the following claims.

As described above, according to the present invention, when a plurality of receivers are operated to select a channel, the receiver connected to the channel selection switch that has been operated for channel selection is activated. Since the broadcast having the tuned frequency corresponding to the channel selection switch operated by the receiver is received, the operation is extremely simple. Further, since the operation state of the channel selection switch in a given receiver and the existing mute signal are used as means for identifying the operated receiver, wiring processing can be performed extremely easily and the configuration can be simplified. Furthermore, in the present invention, since the operated receiver is identified and activated, a large amount of power is not consumed by the receiver that is not operated, thus reducing power consumption. can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG.
The figure is a waveform diagram for explaining the operation of the embodiment shown in the first figure. 1... Television receiver, 2... Radio receiver, 3... Cathode ray tube, 4... Amplifier, 5... Speaker, 6... Power supply, 7, 25... Relay, 8, 2
7, 28... Relay switch, 12... AND gate, 15... OR gate, 17, 22...
NAND gate, 18...Flip-flop, 1
9, 24...Transistor, 29...Display device, 3
0...Oscillator.

Claims (1)

[Scope of Claims] 1. A plurality of receivers comprising a push-button tuning switch and a phase lock loop circuit, and outputting a mute signal when the phase lock loop is in an unlocked state; a first circuit that detects that the station switch is operated; a second circuit that detects that the mute signal is output; and a receiver that is operated based on the first circuit and the second circuit. and activating the receiver.
A receiver control device comprising a circuit.