KR970068546A - Apparatus for preventing deterioration of sub-picture image in a television receiver - Google Patents

Apparatus for preventing deterioration of sub-picture image in a television receiver Download PDF

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Publication number
KR970068546A
KR970068546A KR1019960007753A KR19960007753A KR970068546A KR 970068546 A KR970068546 A KR 970068546A KR 1019960007753 A KR1019960007753 A KR 1019960007753A KR 19960007753 A KR19960007753 A KR 19960007753A KR 970068546 A KR970068546 A KR 970068546A
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KR
South Korea
Prior art keywords
sub
picture
signal
television receiver
channel
Prior art date
Application number
KR1019960007753A
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Korean (ko)
Inventor
박상열
Original Assignee
배순훈
대우전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 배순훈, 대우전자 주식회사 filed Critical 배순훈
Priority to KR1019960007753A priority Critical patent/KR970068546A/en
Publication of KR970068546A publication Critical patent/KR970068546A/en

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Abstract

본 발명은 PIP 기능을 갖는 텔레비젼 수상기에서 부화면 영상 열화 방지장치에 관한 것으로서, 종래의 PIP기능을 갖는 텔레비젼 수상기에서는 주화면과 부화면이 화면상에 표시되는 상태에서 주화면의 채널을 변경시킬 경우 변경된 채널이 무신호 채널이면, 즉, 동기 검출부에서 수평 동기 신호(Hsync)가 검출되지 않게 되면 노이즈가 동기 검출부로 입력되어 동기 검출부의 동기가 비안정되어 신호 합성부에서 합성되는 부화면 영상이 동기신호가 비안정된 상태에서 합성되기 때문에 부화면이 찌그러지는등 부화면이 열화되는 문제점이 있었다.The present invention relates to a sub-picture image deterioration preventing apparatus in a television receiver having a PIP function. In the conventional television receiver having a PIP function, when a channel of a main picture is changed in a state in which a main picture and a sub- When the changed channel is a no signal channel, that is, when the horizontal synchronization signal Hsync is not detected by the synchronization detection unit, the noise is input to the synchronization detection unit, and the synchronization of the synchronization detection unit is unstable, Since the signal is synthesized in the unstable state, the sub-picture is distorted and the sub-picture is deteriorated.

따라서, 상기 문제점을 해결하기 위한 본 발명은 주화면과 부화면이 동시에 화면출력되는 상태에서 주화면이 무신호 채널인 경우 동기 검출단에 구성된 로우패스 필터를 동작시켜 노이즈(Noise)가 동기 검출단으로 입력되지 않도록 하여 주화면이 무신호 채널인 경우에도 부화면이 열화되는 것을 방지할 수 있도록 한 부화면 영상 열화 방지장치이다.In order to solve the above problems, according to the present invention, when a main screen is a non-signal channel in a state where a main screen and a sub-screen are simultaneously output, a low- So that it is possible to prevent the sub-picture from being deteriorated even when the main picture is a no-signal channel.

Description

텔레비젼 수상기에서의 부화면 영상 열화 방지장치Apparatus for preventing deterioration of sub-picture image in a television receiver

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is a trivial issue, I did not include the contents of the text.

제 3 도는 본 발명의 부화면 영상 열화 방지장치가 적용된 텔레비젼 수상기를 보인 블럭도, 제 4 도는 본 발명의 부화면 영상 열화 방지장치의 제어과정을 보인 플로우챠트, 제 5 도는 본 발명의 부화면 영상 열화 방지장치에 의한 주화면의 채널전환시 부화면의 상태를 보인 도면.FIG. 3 is a block diagram showing a television receiver to which the sub-picture image deterioration preventing apparatus of the present invention is applied, FIG. 4 is a flow chart showing a control process of the sub-picture image deterioration preventing apparatus of the present invention, A diagram showing the state of a sub-screen at the time of channel switching of the main screen by the deterioration preventing device.

Claims (1)

주화면에 부화면을 표시하는 PIP 기능을 갖는 텔레비젼 수상기에 있어서, 온동작하여 제1 IF 처리부(5)로 부터 입력되는 신호에서 노이즈를 제거하는 로우패스 필터(20)와, 상기 로우패스 필터(20)를 통해 입력되는 영상 신호에서 동기신호를 검출하는 동기 검출부(21)와, 상기 동기 검출부(21)에서의 동기신호 검출 여부에 따라 상기 로우패스 필터(20)를 온/오프 제어하여 동기 검출부(21)에서 동기신호가 검출되지 않을시 노이즈가 동기 검출부(21)로 입력되지 않도록 하는 마이컴(22)과, 상기 동기 검출부(21)에서 검출된 동기신호에 따라 주화면과 부화면 출력을 위한 영상신호를 합성하는 신호 합성부(23)로 구성된 것을 특징으로 하는 텔레비젼 수상기에서의 부화면 영상 열화 방지장치.A television receiver having a PIP function for displaying a sub-picture on a main screen, comprising: a low-pass filter (20) for removing noise from a signal input from the first IF processing unit (5) A synchronous detector 21 for detecting a synchronous signal in a video signal input through the low pass filter 20 and a low pass filter 20 on the basis of whether or not the synchronous signal is detected by the synchronous detector 21, A microcomputer 22 for preventing a noise when the synchronizing signal is not detected by the synchronizing detecting unit 21 from being input to the synchronizing detecting unit 21; And a signal synthesizing unit (23) for synthesizing a video signal. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: It is disclosed by the contents of the first application.
KR1019960007753A 1996-03-21 1996-03-21 Apparatus for preventing deterioration of sub-picture image in a television receiver KR970068546A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019960007753A KR970068546A (en) 1996-03-21 1996-03-21 Apparatus for preventing deterioration of sub-picture image in a television receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019960007753A KR970068546A (en) 1996-03-21 1996-03-21 Apparatus for preventing deterioration of sub-picture image in a television receiver

Publications (1)

Publication Number Publication Date
KR970068546A true KR970068546A (en) 1997-10-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019960007753A KR970068546A (en) 1996-03-21 1996-03-21 Apparatus for preventing deterioration of sub-picture image in a television receiver

Country Status (1)

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KR (1) KR970068546A (en)

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