KR970057049A - Video / Audio Circuit Operation Status Discrimination Device and Method in TV Process - Google Patents

Abstract

The present invention is to determine the operation state of the video / audio circuits during the TV process automatically display the on-screen display state of the determination result of the video / audio circuit operation state determination device of the TV to increase the mass production efficiency It is about a method.

The present invention includes a video / audio processing unit for processing the high frequency signal tuned from the tuner and outputting the video signal and the audio signal separately and muting the video and audio under the control of the microcomputer; A video amplifier for amplifying the video signal; A first comparing unit comparing the output signal of the video amplifier with a reference signal; An audio amplifier for amplifying and outputting an audio signal to a predetermined level; A second comparing unit comparing the output signal of the audio amplifying unit and the reference signal; A microcomputer for controlling the tuner and the video / audio processing unit and determining an operating state of the video and audio circuits using the output signals of the first and second comparators; And an on-screen display unit for outputting the video / audio circuit discrimination state output from the microcomputer as on-screen display data.

Description

Video / Audio Circuit Operation Status Discrimination Device and Method in TV Process

Since this is an open matter, no full text was included.

1 is a block diagram of a video / audio circuit operation state determination device during TV processing according to the present invention.

2 is a flowchart illustrating a method for determining an operating state of a video / audio circuit during TV processing according to the present invention.

Claims (2)

A tuner 1 for tuning the TV signal received via the antenna; A video / audio processing unit (2) for processing the high frequency signal tuned by the tuner (1), separating and outputting the video signal and the audio signal, and muting the video and audio under the control of the microcomputer (9); A video amplifier (4) for amplifying the video signal output from the video / audio processor (2); A first comparator 5 for comparing the output signal of the video amplifier 4 with a first reference signal; An audio amplification unit 6 for amplifying and outputting the audio signal output from the video / audio processing unit 2 to a predetermined level; A second comparator 8 for comparing the output signal of the audio amplifier 6 with a second reference signal; A microcomputer (9) which controls the tuner (1) and the video / audio processing section (2) and determines the operating states of the video and audio circuits by the output signals of the first and second comparators (5) (8); And an on-screen display unit (10) for outputting the video / audio circuit discrimination state output from the microcomputer (9) as on-screen display data. A first step (S1-S5) of outputting tuning data of a set channel, searching for an output signal of a video comparator, displaying an abnormal state of a video circuit if a low signal, and generating a video mute signal if a high signal; A second step (S6-S8) of searching for the output signal of the video comparator after video muting to display an abnormality of the video muting circuit if the signal is high and searching for the output signal of the audio comparator if the signal is low; A third step (S9, S10) of searching for the output signal of the audio comparator and displaying an abnormal state of an audio circuit if the signal is low and generating an audio mute signal if the signal is high; And a fourth process (S11, S12) of searching for the output signal of the audio comparator after the audio mute and indicating an abnormality of the audio mute circuit if the high signal is detected and determining that the audio mute circuit is normally operated if the low signal is received. Video / audio circuit operation status determination method during TV processing. ※ Note: This is to be disclosed based on the first application.