JPH08298636A - Television receiver with built-in video tape recorder - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the power consumption of a television receiver with a built-in VTR. [Structure] A power switch circuit 9 is provided for detecting an operation mode of a television receiver with a built-in VTR by a microcomputer 10 and turning off a power supply of a tuner which is not required for the operation mode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to power saving of a television (hereinafter referred to as "TV") receiver incorporating a video tape recorder (hereinafter referred to as "VTR").

[0002]

2. Description of the Related Art FIG. 6 is a block circuit diagram showing a video signal system and a tuner power supply system of a conventional TV receiver with a built-in VTR.
Is a tuner for TV built in the TV receiver, 2 is V
VTR tuner built in TR, 3 is a tuner power supply for supplying power to TV tuner 1 and VTR tuner 2, 4 is an input terminal for a video signal reproduced by the VTR, 5 is an input terminal for an external input signal, 6 is a switching circuit, T
Any of the reception signal of the V tuner 1, the reception signal of the VTR tuner 2, the reproduced video signal, and the external input signal is switched by the viewer's selection. Reference numeral 7 is a video signal processing circuit for processing the signal input from the switching circuit 6, and 8 is a display device.

[0003]

[Problems to be Solved by the Invention] Conventional TV with built-in VTR
In the receiver, when the power of the TV receiver is turned on, the tuner power supply 3 supplies power to the TV tuner 1 and the VTR tuner 2. For this reason, the VTR tuner 2 is in the operating state even when receiving the TV broadcast, and the TV tuner 1 and the VTR tuner 2 are in the operating state even when the VTR is in the reproducing state. Was being consumed.

The present invention has been made for the purpose of solving the above-mentioned problems, and an unnecessary power source for a tuner is turned on.
The purpose is to save power by performing FF.

[0005]

The present invention stops power supply to a VTR tuner when receiving a TV broadcast, and
When the VTR is reproduced, a means for stopping the power supply to the TV tuner and the VTR tuner is provided.

[0006]

According to the present invention, an unnecessary tuner power source is automatically turned on according to the operation mode of the TV receiver with a built-in VTR.
It can be FF.

[0007]

【Example】

Example 1. FIG. 1 is a block circuit diagram of an embodiment of the present invention, in which the same reference numerals as those in FIG. 6 denote the same or corresponding parts, and 9 is a power switch circuit, which is a switch circuit 9a.
.About.9f. Reference numeral 10 denotes a microcomputer that controls ON / OFF of the power switch circuit 9 according to the operation mode of the TV receiver. As shown in FIG. 2, during TV reception, the first switching signal a of H level is sent to the switch circuit 9a. To 9c, and outputs the second switching signal b of H level to the switch circuits 9a to 9f when recording the signal received by the VTR tuner, and outputs the first and second switching signals in other operation modes. Signals a and b are L
To level.

FIG. 3 is a diagram showing the configuration of the switch circuits 9a to 9f. Since the switch circuits 9a to 9f have the same configuration and operate in the same manner, the switch circuit 9a is shown here as an example. In FIG. 3, 11 is a switching signal input terminal, Q1 and Q2 are transistors, and R1 to R4 are resistors. When an H level switching signal is input to the input terminal 11, Q1 is turned on, and then Q2 is turned on. Then, the power supply voltage is applied to the power supply output terminal 12. On the other hand, when the input terminal 11 is at L level, Q1 is OFF, Q
2 is also turned off, and the power supply voltage is not applied to the output terminal 12.

As a result, at the time of receiving a TV, the power supply voltage is supplied only to the TV tuner 1 to operate, and the received TV broadcast signal is input to the switching circuit 6. On the other hand, since the power supply voltage is not applied to the VTR tuner 2, power saving can be achieved, and a beat signal appearing on the display screen due to mutual interference of high frequency radio waves generated when the two tuners operate can be prevented. Results can also be obtained.

Embodiment 2. In the first embodiment, an example in which the TV tuner 1 and the VTR tuner 2 are separately provided has been described.
The same can be applied to the case of a TV receiver with a built-in VTR in which one tuner is commonly used for TV and VTR.

FIG. 4 is a block circuit diagram of the second embodiment.
The same reference numerals denote the same or corresponding parts, and 13 is a tuner commonly used for TV / VTR. As shown in FIG. 5, the microcomputer 10 has an H level when receiving a TV and recording a VTR. Outputs the level switching signal c, and L in other operation modes.
To level. Therefore, TV / VTR common tuner 1
3 operates only during TV reception and VTR recording, and TV / VTR common tuner 1 during video tape recorder playback operation
Since the power to 3 is turned off, power saving can be achieved.

[0012]

As described above, according to the present invention, the TV
Since the tuner built in the receiver is supplied with power from the tuner power source only when it is necessary to operate, a TV receiver with a built-in VTR with reduced power consumption can be obtained.

[Brief description of drawings]

FIG. 1 is a block circuit diagram of a first embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between an operation mode and a switching signal according to the first embodiment.

FIG. 3 is a diagram illustrating a switch circuit according to a first exemplary embodiment.

FIG. 4 is a block circuit diagram of a second embodiment of the present invention.

FIG. 5 is a diagram showing a relationship between an operation mode and a switching signal according to the second embodiment.

FIG. 6 is a block circuit diagram showing a video signal system and a tuner power supply system of a conventional TV receiver with a built-in VTR.

[Explanation of symbols]

1 TV tuner, 2 VTR tuner, 3 tuner power supply, 4 playback video signal input terminal, 5 external signal input terminal, 6 switching circuit, 7 video signal processing circuit, 8
Display device, 9 power switch circuit, 9a-9f switch circuit, 10 microcomputer, 13 TV / V
TR shared tuner.

Claims (3)

[Claims] 1. A television receiver with a built-in video tape recorder having a tuner capable of selecting a plurality of operation modes, comprising means for turning off the power supply to the built-in tuner which is unnecessary for the operation in the selected operation mode. A television receiver with a built-in video tape recorder. 2. A television receiver with a built-in video tape recorder having a television tuner and a video tape recorder tuner, comprising means for turning off the power supply to the video tape recorder tuner during a television broadcast receiving operation. A television receiver with a built-in video tape recorder. 3. A television receiver with a built-in video tape recorder equipped with a tuner for both a television and a video tape recorder, comprising means for turning off the power to the tuner when the video tape recorder is in a reproducing operation. A television receiver with a built-in video tape recorder.