JPH04132375A - Receiver - Google Patents

Abstract

PURPOSE:To avoid an unnecessary current consumption on the air of a CM broadcasting by providing a audio multiplex detecting circuit connected with an voice circuit, signal discriminating circuit, and switchover controlling circuit. CONSTITUTION:A signal discriminating circuit 16 recognizes on-the-air of a bilingual broadcasting by a signal from an audio multiplex detecting circuit 15, turns a horizontal output circuit 9 into a received picture outputting state by a signal from a switchover controlling circuit 17, and turns a voice circuit 13 into a reception outputting state. Then, when the bilingual broadcasting is switched into a monophonic broadcasting such as CM, or a stereo broadcasting, the audio multiplex detecting circuit 15 outputs a signal indicating the broadcasting except for the bilingual broadcasting. As the result, the output of the signal discriminating circuit 16 transmits the broadcasting except for the bilingual broadcasting to the switchover controlling circuit 17, the current consumption of the current controlling part of the horizontal outputting circuit 9 is switched so as to be decreased, the current consumption at a power amplifier stage of the voice circuit 13 is decreased so that the current consumption of the voice circuit 13 can be decreased, and recovered into the received picture outputting state at the time of the completion of the CM. Thus, the current consumption can be decreased.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a television receiver.

(Prior Art) Receiving devices have conventionally been used in television receivers.

A conventional receiving device will be described using a television receiver as an example.

FIG. 3 is a block diagram of a conventional receiving device.

In the figure, l is a tuner, 2 is an intermediate frequency amplification circuit, 3 is a video circuit, 4 is a video amplification circuit, 5 is a cathode ray tube,
6 is a deflection circuit, 7 is a vertical output circuit, 8 is a deflection yoke of the cathode ray tube 5, 9 is a horizontal output circuit, 10 is a high voltage circuit, II
The heater 12 of the cathode ray tube 5 is a power supply circuit, 13 is an audio circuit, and 14 is a speaker.

The operation of the receiving device configured as described above will be explained.

In the television receiver, the tuner 1 selects a desired channel signal from the VHF band, UHF band, and SHF band TV high frequency signals received by the receiving antenna,
Convert to intermediate frequency. In order to further increase the selectivity, the intermediate frequency amplification circuit 2 amplifies the signal and divides it into an audio signal and a video signal.
transmitted to.

The audio circuit 13 demodulates the audio signal from the transmitting side and drives the speaker 14.

The signal from the video circuit 3 is separated into a video amplification circuit 4 and a deflection circuit 6. In the case of a color television, the video amplification circuit 4 amplifies the RGB signals and outputs them to the cathode ray tube 5. The signal sent to the deflection circuit 6 is separated into a horizontal output circuit 9 and a vertical output circuit 7, and the signal from the vertical output circuit 7 is output to the deflection yoke 8 of the cathode ray tube 5. is sent to the deflection yoke 8 of the cathode ray tube 5, and the other output is boosted by a high voltage circuit 10 to supply a high voltage to the flyback transformer of the cathode ray tube 5. Furthermore, power is supplied to the heater 11 of the cathode ray tube 5 by a high voltage circuit IO. The signal sent to the cathode ray tube 5 and
Images can be reproduced using high voltage, and television broadcasts can be received by making sounds from the speaker 14. As described above, when watching bilingual television broadcasts including audio reception, commercials (hereinafter referred to as CMs), either stereo or monaural, are broadcast in the middle of the program. Since both video and audio continue to be output unless the TV is turned off, the power consumption of the television is almost the same as when it is receiving a program.

(Problem to be Solved by the Invention) The conventional configuration described above has a problem in that television viewers must consume the same amount of power while the CM is being broadcast as they do during the program. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a receiving device that eliminates the conventional drawbacks and does not consume unnecessary power during CM broadcasts.

(Means for Solving the Problems) A receiving device of the present invention includes an audio multiplex detection circuit connected to an audio circuit, a signal determination circuit, and a switching control circuit.

(Function) With the above-described configuration, the present invention detects that the bilingual broadcast is switched to a broadcast other than the bilingual broadcast, thereby reducing the power consumption of the deflection circuit.

(Embodiment) FIG. 1 is a block diagram of a receiving device according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating the audio state thereof.

In FIG. 1, numerals 1 to 14 are the same as the configuration of the conventional example shown in FIG. 3, so the explanation thereof will be omitted.

Reference numeral 15 denotes an audio multiplex detection circuit for determining audio multiplexing of stereo, main tone, and subtone from the audio detection signal.

16 is a bilingual broadcast based on the audio multiplexing discrimination signal.
This is a signal determination circuit that determines whether or not the signal is present. 17 is switched to reduce the power consumption in the deflection yoke 8 of the cathode ray tube 5 by controlling the horizontal output circuit 9 when the bilingual broadcast changes to a non-bilingual broadcast based on a signal from the signal determination circuit 16. Control signal for horizontal output circuit 9
This is a switching control circuit that sends signals to

The operation of the receiving device configured as described above will be explained.

When receiving bilingual broadcasting, the audio multiplex detection circuit 15 displays that bilingual broadcasting is possible. The signal determination circuit 16 uses the signal from the audio multiplex detection circuit 15 to
Recognizing that bilingual broadcasting is in progress, the switching control circuit 17
The horizontal output circuit 9 is set to a received image output state, and the audio circuit 13 is set to a received image output state by a signal from . Next, when switching from bilingual broadcasting to monaural broadcasting such as commercials or stereo broadcasting, the audio multiplex detection circuit 15 outputs a signal other than the bilingual broadcasting. As a result, the signal determination circuit 16
Switching control circuit to ensure that the output is other than bilingual broadcasting]
Send to 7. The switching control circuit 17 that receives a signal other than bilingual broadcasting switches the signal so as to reduce the power consumption of the power control section of the horizontal output circuit 9, and also switches the switching control circuit 17 so as to reduce the power consumption of the power control section of the horizontal output circuit 9, and also switches the signal so as to reduce the power consumption of the sound south circuit 13. The power consumption of the power amplifier stage of the circuit 13 is reduced. Subsequently, when the commercial ends and bilingual broadcasting returns, the received image output state and received sound output state are restored. When switching to another channel during the low power consumption state, the low power consumption state is canceled and the normal reception state is restored. Depending on the configuration, it is possible to select only one of audio and video without putting both in a low power consumption state. In order to achieve a low power consumption state, the power consumption of the cathode ray tube heater 11 can also be reduced.

Since the viewer may be surprised if the audio suddenly returns to loud audio from a low power consumption state, that is, from a quiet or silent state, it is possible to make the audio return gradually louder.

(Effects of the Invention) According to the present invention, by providing a bilingual or non-bilingual audio state determination circuit and a power switching control section, it is possible to reduce power consumption, and Therefore, unnecessary power consumption is suppressed, which has a great practical effect.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a receiving device according to an embodiment of the present invention, FIG. 2 is a diagram for explaining the audio state, and FIG. 3 is a block diagram of a conventional receiving device. ■...Tuner, 2...Intermediate frequency amplification circuit,
3...Video circuit, 4...Video amplification circuit,
5... Braun tube, 6... Deflection circuit, 7...
・Vertical output circuit, 8... Deflection yoke, 9... Horizontal output circuit, 10... High voltage circuit, 11... Heater 12... Power supply circuit, 13... Audio circuit,
14...Speaker, 15...Audio multiplex detection circuit,
16...Signal judgment circuit, 17...Switching control circuit. Patent applicant Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] (1) An audio multiplex detection circuit that receives an audio signal of a television signal and detects an audio multiplex state, a signal determination circuit that receives a signal from the audio multiplex detection circuit and determines the signal, and the signal determination circuit. A switching control circuit that switches the power consumption of the horizontal output circuit based on a signal from the switching control circuit, and a horizontal output circuit that reduces the power consumption of the deflection yoke and the horizontal output circuit based on the signal from the switching control circuit. Receiving device. (2) an audio multiplex detection circuit that receives an audio signal of a television signal and detects an audio multiplex state; a signal determination circuit that receives a signal from the audio multiplex detection circuit and determines the signal; and the signal determination circuit. Claim (1) characterized in that it comprises a switching control circuit that switches the power consumption of the horizontal output circuit according to a signal from the circuit, and means for reducing the power consumption of the speaker drive circuit according to the signal from the switching control circuit.
) Receiving device described.