KR920006266Y1 - Video signal control circuit in color tv which has stationary picutre - Google Patents

Abstract

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Description

Image Signal Control Circuit for Still Image in Television Receiver

1 is a specific circuit diagram of the present invention.

* Explanation of symbols for main parts of the drawings

1: RF receiver 2: Audio detector

3: video detector 4: moving picture detector

5: Still image detection unit 6: Image control unit

7: audio control unit 8: remote control unit

9: switching control unit 10: audio amplifier

11: noise canceling unit VF1-VF3: inverter

R1-R13: resistor Q1-Q4: transistor

SW1-SW3: Switch C1-C8: Capacitor

A1-A2: Amplifier D1: Diode

The present invention relates to a television receiver, and more particularly, to a circuit capable of removing an image signal and outputting an audio signal film when outputting a still image.

In general, television stations transmit music by outputting a still image before or after broadcasting. In particular, the development of the satellite broadcasting is gradually increasing, except for the broadcast time, and outputs the video signal of the stereo image and the stereo music. At this time, when the viewer wants to listen to the music while the still picture is being reproduced as described above, the viewer had to listen to the music while watching the still picture.

Accordingly, an object of the present invention is to provide a circuit capable of listening to an audio signal in a state where a video signal is removed when a still picture is output to a television receiver.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a detailed circuit diagram of the present invention, which receives an RF receiver 1 for amplifying and tuning a received television broadcast signal and an output of the RF receiver 1, and detects an audio signal from the received RF signal. An audio detector 2, an output of the RF receiver 1, a video detector 3 for detecting a video signal from the received RF signal, and an output of the video detector 3; A moving picture detection unit 4 which analyzes the received video signal to detect the presence of a moving picture signal, and a still picture detection unit which receives the output of the video detection unit 3 and analyzes the received video signal to detect the presence of a still picture signal. (5) and an image control unit which receives the outputs of the moving image detection unit 4 and the still image detection unit 5, and generates a first image control signal indicating whether or not the image signal is removed according to the state of the received signal ( 6) with, An audio control unit 7 which receives the output of the audio detection unit 2 and separates the received audio signal into left and right channels, a remote control unit 8 which generates a second image control signal and an audio control signal, An audio width consisting of resistors R10-R13, capacitors C5-C8, and amplifiers A1-A2, receiving left and right channel audio signals of the audio control unit 8 and amplifying and outputting the received audio signals. A unit 10, an inverter VF1-VF3, resistors R1-R6, diodes D1, and transistors Q1-Q3, and the video signal of the video detector 3 and the audio controller 7 And the left and right channel audio signals, and are switched when the first image control signal according to the still image is received from the image controller 6 or when the second image signal is received from the remote controller 8. Switch for blocking the passage of signal and connecting the passage of audio signal The controller 9 includes capacitors C1-C4, resistors R7-R9, and transistors Q4, and removes external input noise of the image signal when the switching controller 9 blocks the passage of the image signal. It consists of a noise canceling unit (11).

Referring to the present invention in detail based on the configuration of FIG. 1, first, a television broadcast signal received through the RF receiver 1 is a signal including an image signal and an audio signal, and the signal is an audio detector 2 and The video detection unit 3 separates the audio signal and the video signal, respectively. At this time, the video signal is inputted to the moving picture detection unit 4 and the still picture detection unit 5. The moving picture detection unit 4 checks the state of the received video signal and receives a moving picture detection signal if the received video signal is a moving image signal. The still picture detecting unit 5 checks the state of the received video signal and outputs a still picture detection signal if the received video signal is a still picture signal. Then, the image control unit 6 receives and analyzes the outputs of the moving image detecting unit 4 and the still image detecting unit 5, and when detecting the still image signal, outputs the first image control signal in the "low" state and then displays the moving image. When the signal is detected, the first video control signal in the "high" state is output. In addition, the audio controller 6 separately outputs the audio signal received from the audio detector 2 into audio signals of left and right channels so that the audio signal can be reproduced as a stereo signal.

First, when the moving picture signal is generated, the moving picture detection unit 4 generates the moving picture detection signal, so that the image control unit 6 outputs a first image control signal of "high" logic, and the remote control unit 8 Outputs the second video control signal of " high " logic to the inverters VF2-VF3. Then, since the transistor Q1 is turned on by the output of the image controller 6, the switch SW1 is "on". Therefore, since the output terminal of the video detector 3 is connected to one end of the capacitor C1, the video signal of the moving picture is amplified through the transistor Q4 and then output. At this time, a signal applied from the remote controller 8 to the inverter VFl does not affect the output of the image controller 6 by the diode D1. In addition, since the PNP type transistors Q2 and Q3 are turned on by the audio control signal of the "high" state applied to the inverters VF2-VF3, the switches SW2 and SW3 are "on". As a result, a passage of an audio signal of left and right channels separated and output from the audio controller 7 is formed. That is, the audio signals of the left and right channels are amplified by the amplifiers A1 and A2, and then applied to the switches SW2 and SW3 through the coupling capacitors C3 and C4, respectively. Is a state in which the remote control controller 8 maintains the " on " state so that a passage of the audio signal is formed.

Secondly, when the still image signal is detected, the still image detection unit 5 generates a still image detection signal, so that the image control unit 6 outputs a first image control signal having a "low" logic. Transistor Q1 is turned off to turn off switch SW1. At this time, even if the output of the inverter VF1 becomes "high" by outputting the "low" signal from the remote controller 8 to the inverter VF1, the output of the image controller 6 is "low", so that the transistor Q1 The base potential of is maintained at " low " state. Therefore, when the output of the video controller 6 is in the "low" state, the switch SW1 is turned off regardless of the output of the remote controller 8. When the switch SW1 is turned off, the output path of the video signal outputting the video detector 3 is disconnected, so that the video signal of the still picture cannot be applied to the capacitor C1 side. In the state in which the video signal is not input as described above, the external noise may be generated. Therefore, the noise is passed through the capacitor C7 and the resistor R7 on the base of the transistor Q4. Remove it. When the remote controller controller 8 outputs the second video control signal of "high" logic to the inverters VF2 and VF3, the signal is inverted to a "low" signal to turn on the transistors Q2 and Q3. The switches SW2 and SW3 are then "on" to form the output path of the audio signal. At this time, the audio signal separated into the left and right channels from the audio controller 7 is amplified through the amplifiers A1 and A2 and then output through the switches SW2 and SW3.

Therefore, in the above state, only a passage of the audio signal may be formed in a state where the video signal is completely removed when the video signal is generated.

As described above, when watching an audio signal in a still image signal state on a television receiver, the audio signal can be enjoyed only during a still image by completely removing the Hi-Fi audio signal to a speaker after completely removing it so as not to output an unnecessary still image signal. In addition, there is an advantage that can be operated through the remote control as described above.

Claims (1)

In a still image, a signal control circuit receives a video signal, analyzes the received video signal to detect the presence or absence of a still picture signal, and receives the output of the still picture detection unit 5, An image controller 6 for generating a first image control signal indicating the presence or absence of an image signal according to the state of the received signal, and an audio controller for receiving an audio signal and separating and outputting the received audio signal into left and right channels; 7), a remote controller 8 for generating a second image control signal and an audio control signal, and an audio amplification for receiving the left and right channel audio signals of the audio controller 8 and amplifying and outputting the received audio signal. And a switch means, for receiving the video signal and the left and right channel audio signals of the audio control unit 7 and receiving a still image from the video control unit 6. A switching control unit 9 which switches the switching means to block the passage of the image signal and to connect the passage of the audio signal when the first image control signal is received or when the second image signal is received from the remote controller controller 8. And a noise canceling unit (11) for removing external input noise of the video signal when the switching controller (9) blocks the passage of the video signal.