JP2600658B2 - TV receiver - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention particularly relates to a television receiver whose audio output circuit can be used as an audio amplifier for audio equipment.

[Summary of the Invention]

According to the present invention, in a television receiver, a power supply circuit for supplying power to an audio system circuit and a power supply circuit for supplying power to a video system circuit are independently turned on / off, and only an audio signal is supplied. When performing playback, stop the power supply to the video system circuit,
In addition to reducing power consumption, high-quality audio reproduction can be performed.

[Conventional technology]

If an audio output circuit with good frequency characteristics and high output is used as the audio output circuit of the television receiver and an input terminal only for audio is provided, the VTR can be used in the television receiver.
Audio devices such as compact disk players and cassette tape recorders can be connected as well as video devices such as video and video discs, and the audio output circuit of the television receiver can be used as an audio amplifier for these audio devices. By constructing such a system, it is possible to perform video reproduction while performing high-quality audio reproduction, or to reproduce only audio. Further, it becomes possible to reproduce a reproduced audio signal of a compact disc or the like in accordance with another screen.

By the way, a conventional television receiver is not configured to reproduce only audio. Therefore, when the power switch is turned on, both the video system circuit and the audio system circuit are set to the operating state.

[Problems to be solved by the invention]

In the conventional television receiver, the video circuit and the audio circuit are operated as described above. When the audio output circuit of the television receiver is used as an audio amplifier for audio equipment, it is not necessary to operate the video circuit, and even in such a case, operating the video circuit requires power consumption. Is useless. In addition, operating a video system circuit may adversely affect an audio system. That is, when the video circuit is operating, the horizontal oscillation circuit of the deflection circuit operates. This horizontal oscillation frequency is 15.734 KHz, which is within the band of the audio signal, and its oscillation output is quite large. For this reason, this horizontal oscillation output jumps into the audio signal, and the S / N ratio of the reproduced audio signal is degraded.

Therefore, an object of the present invention is to reduce power consumption by enabling the supply of power to a video system circuit to be stopped when only an audio signal is reproduced.
An object of the present invention is to provide a television receiver capable of performing high-quality audio reproduction.

If the supply of power to the video circuit is stopped when only the audio signal is reproduced, no image is displayed on the screen. If such a state continues, there is a possibility that the user may mistakenly recognize the failure. Also, in such a state, even if the adjustment buttons such as hue, color saturation, brightness, etc. are operated incorrectly, when nothing is displayed on the screen, the screen change is not noticed and when the screen is projected later However, there is a risk that the user may mistakenly recognize that a failure has occurred.

Therefore, another object of the present invention is to provide a television receiver capable of displaying an image when power is not supplied to a video system circuit and prohibiting control of the video system, thereby preventing erroneous operation.

[Means for solving the problem]

According to the present invention, a power supply circuit for supplying power to a video circuit and a power supply circuit for supplying power to an audio circuit are provided, and the power supply circuit for supplying power to the video circuit is independently turned on / off. A television receiver characterized in that control of a video signal is prohibited when a power supply circuit for supplying power to a video circuit is turned off while being turned off.

[Action]

When the image cut state is set, the power supply circuit 51 for image deflection is stopped by a command from the microcomputer 61. At this time, a display indicating that the image is cut is displayed on the display lamp 84. And at this time,
Even when the image quality is adjusted, the video signal processing circuit 55 is controlled so that the analog control voltage for image quality adjustment is not supplied.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

The present invention is suitable for use in a television receiver to which various video and audio devices can be connected as shown in FIG. That is, in FIG. 2, reference numeral 1 denotes a television receiver. The television receiver 1 has 8
Video equipment such as millimeter VTR2, VTR3, and video disk 4 can be connected, and a compact disk player 5, a cassette tape recorder 6, and an audio tuner 7 can be connected. An input changeover switch 8 is provided on the front panel of the television receiver 1. By operating the input changeover switch 8, various video and audio devices connected to the television receiver 1 are selected. The desired one is selected. As shown in FIG. 3, the input changeover switch 8 includes buttons 10, 11, and 12 for switching video inputs, buttons 13, 14, and 15 for switching audio inputs, and a button for receiving television broadcasting. It consists of 16 buttons. In an initial state when the power is turned on, the television broadcasting is set to a receiving state. This is to prevent erroneous operation by the user. When the button 10 is pressed, the reproduction signal of the video disc 4 is supplied to the television receiver 1, and when the button 11 is pressed, the reproduction signal of the VTR 3 is supplied to the television receiver 1.
When the button 12 is pressed, a reproduction signal of 8 mm VTR 2 is supplied to the television receiver 1. When the button 13 is pressed, the output of the audio tuner 7 is supplied to the television receiver 1. When the button 14 is pressed, the playback signal of the cassette tape recorder 6 is supplied to the television receiver 1. When the button 15 is pressed, the compact disk player is pressed. 7 is supplied to the television receiver 1. When the button 16 is pressed, a received signal of the television broadcast is supplied to the television receiver 1.

As the audio output circuit of the television receiver 1, a high-output audio circuit having good frequency characteristics is used. Speakers 9A and 9B are connected to the television receiver 1, and reproduced sounds of audio signals are output from the speakers 9A and 9B.

This television receiver 1 has a commander shown in FIG.
17 can be operated. The commander 17 is provided with a channel changeover switch 18, a channel up / down switch 19, a volume up / down switch 20, and an input changeover switch 21. By operating the buttons 22, 23, 24, and 25 provided on the commander 17, image quality adjustment such as hue and brightness, and image quality adjustment can be performed. As with the input changeover switch 8 provided on the front panel of the television receiver 1, the input changeover switch 21 of the commander 17 allows the user to select from various video and audio devices connected to the television receiver 1. The desired one can be selected.

When video equipment such as 8 mm VTR2, VTR3 and video disc 4 and television broadcasting are selected by the input changeover switch 8 on the front panel of the television receiver 1 or the input changeover switch 21 of the commander 17, television reception is performed. The reproduced image is displayed on the CRT display 26 of the device 1, and the reproduced sound is output from the speakers 9A and 9B. When the compact disk player 5, the cassette tape recorder 6, and the audio tuner 7 are selected, the reproduced sound is output from the speakers 9A and 9B. At this time, no video signal is supplied to the television receiver 1 and the CRT display 2
6 shows a display on the screen indicating that the audio device has been selected.

By the way, when the audio device is selected as described above, since the video signal is not supplied to the television receiver, it is not necessary to set the video system to the operation state. An image cut button 28 is provided on a front panel of the television receiver 1. The commander 17 is also provided with a similar image cut button 29. When these image cut buttons 28 or 29 are pressed, the power of the video system of the television receiver 1 is stopped, and the operation of the video system is stopped. And the television receiver 1
A display indicating that the image is in the cut state is displayed on the display unit 30 of the front panel. As described above, by stopping the operation of the video system, it is possible to reduce the power consumption and prevent the deterioration of the S / N ratio of the audio signal due to the influence of the deflection circuit.

In the image cut state, the image quality cannot be adjusted by operating the buttons 22, 23, 24, and 25 of the commander 17. This is to prevent the user from noticing a change in the screen when the image quality is erroneously adjusted in the image cut state and the image cut state is cancelled, so that the user is erroneously recognized as having failed.

The image cut state is immediately released when a television broadcast reception signal is selected by the input changeover switch 8 or the input changeover switch 21. In the initial state,
The image is not set to the image cut state unless the image cut button 28 or 29 is pressed. This is to prevent a case where a failure has occurred from being mistakenly recognized when an image is not displayed on the CRT display 26 because the image is set to the image cut state.

FIG. 1 shows the configuration of one embodiment of the present invention. A television receiver to which the present invention is applied includes a power supply circuit 51 for deflecting video and a power supply circuit 52 for audio. The power supply circuit 51 for video deflection supplies power to the video intermediate frequency amplification and video detection circuit 54, the video signal processing circuit 55, and the deflection circuit 56. Power supply circuit 52 for audio
Is a tuner circuit 53, an audio intermediate frequency amplification circuit 57, an audio multiplex decoder 58, a sound quality / volume control circuit 59, an audio output circuit 60
Supply power to the
Supply power to 61. The power supply circuit 51 for image deflection and the power supply circuit 52 for audio are provided by a microcomputer.
According to the instructions from 61, each can operate independently.

A key switch 63 is connected to the microcomputer 61, and an input command is given to the microcomputer 61 by the key switch 63. Also, a command from the commander 64 is given to the microcomputer 61 via the light receiving unit 65.

The microcomputer 61 performs input switching according to a command from the key switch 63 or the commander 64 and generates data for performing image quality adjustment and sound quality adjustment. Further, the microcomputer 61 sets an image cut state.

In FIG. 1, composite video output signals from a video disk, a VTR, and an 8 mm VTR are supplied to input terminals 71, 72, 73, respectively. The composite video signals from the input terminals 71, 72, 73 are supplied to the source switching circuit 66. The source switching circuit 66 includes a tuner circuit 53
, And a video intermediate frequency amplification and video detection circuit 54
, A composite video signal of a television broadcast is supplied. Of these composite video signals, a desired video signal is selected by a source switching circuit 66 based on a source switching signal from the microcomputer 61.

The composite video signal selected by the source switching circuit 66 is supplied to the video signal processing circuit 55, and a synchronization signal in the video signal is separated, and the synchronization signal is supplied to the deflection circuit 56. The video signal is demodulated by the video signal processing circuit 55, and the output of the video signal processing circuit 55 is supplied to the CRT display 67 via the addition circuit 69.
A deflection current is formed by the deflection circuit 56, and this deflection current is
It is passed through the deflection coil of the CRT display 67. Adder circuit 6
9 is supplied with a display signal from a display generation circuit 68, and this display signal is superimposed on the output of the video signal processing circuit 55.
The output of the microcomputer 61 is supplied to the display generation circuit 68. As a result, various information is displayed on the CRT display 67 on the screen.

Input terminals 74, 75, and 76 are connected to video discs and VTs, respectively.
R and 8 mm TVR reproduction audio signals are supplied, and input terminals 77, 78 and 79 are supplied with reproduction audio signals of an audio tuner, a cassette tape recorder and a compact disc player, respectively. These audio signals are supplied to the source switching circuit 80. Further, the audio signal of the television broadcast received by the tuner circuit 53 and demodulated via the audio intermediate frequency amplification circuit 57 and the audio multiplex decoder 58 is supplied to the source switching circuit 80.
These audio signals are selected by the source switching circuit 80 based on a source switching signal from the microcomputer 61.

The audio input signal is a stereo input and has left and right channel input terminals.
For simplicity, only one channel audio input is shown.

The audio signal selected by the source switching circuit 80 is supplied to an audio output circuit 60 via a sound quality / volume control circuit 59.The audio signal amplified by the audio output circuit 60 is supplied to speakers 81 and 82, and the speaker 81 And 82 are driven.

The image quality adjustment and the sound quality / volume adjustment are performed by adjustment data from the microcomputer 61 generated based on a command from the key switch 63 or the commander 64. That is, the microcomputer 61 outputs image quality adjustment data such as color tone, color density, brightness, and sharpness, and also outputs audio adjustment data such as sound quality and volume adjustment. The adjustment data is supplied to the D / A converter 83. An analog control voltage for image quality adjustment and an analog control voltage for audio adjustment are output from the D / A converter 83. The analog control voltage for image quality adjustment is supplied to a video signal processing circuit 55, and the analog control voltage for audio adjustment is supplied to a sound quality / volume control circuit 59. Thereby, image quality adjustment and sound quality / volume adjustment are performed.

When the image cut state is set, the power supply circuit 51 for deflecting the image is stopped by a command from the microcomputer 61. At this time, a display indicating that the image is cut is displayed on the display lamp 84. At this time, even if the image quality is adjusted, control is performed so that the data for video image quality adjustment is not changed.

〔The invention's effect〕

According to the present invention, when only the reproduction of the audio signal is performed, the supply of power to the video circuit can be stopped. Therefore, power consumption is reduced, and
High-quality audio playback can be performed. Further, according to the present invention, when the image is in the image cut state, the image quality cannot be adjusted, so that a malfunction is prevented. Furthermore, in the initial state, the apparatus is in the television receiving state. Even in the image cutting state, when the television receiving state is set, the image cutting state is canceled immediately. Then, when the image is cut, the display lamp is turned on, so that the user can know that the image is cut without using the display on the screen. Therefore, malfunction is prevented, and operability is improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 is a perspective view used for describing one embodiment of the present invention, and FIG. 3 is a plane used for describing an input changeover switch according to one embodiment of the present invention. FIG. 4 is a plan view used for explaining a commander in one embodiment of the present invention. Description of main reference numerals in the drawings 28, 29: image cut button, 30: display unit, 51: power supply circuit for video deflection, 52: power supply circuit for audio, 61: microcomputer, 84: display lamp.

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Kiichi Ihara 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (56) References JP-A-56-1115013 (JP, A)

Claims (1)

(57) [Claims] 1. A power supply circuit for supplying power to a video-related circuit, a power supply circuit for supplying power to an audio-related circuit, and a video image quality adjusting means for adjusting a video signal; In this mode, the power supply circuit for supplying power to the video circuit and the power supply circuit for supplying power to the audio circuit are both driven, and the video image quality adjusting means is operable to output only audio. In this mode, while driving only the power supply circuit that supplies power to the audio system circuit,
A television receiver, wherein the operation of the video image quality adjustment means is invalidated.