KR930017453A

KR930017453A - Image quality control circuit according to broadcasting system

Info

Publication number: KR930017453A
Application number: KR1019920001552A
Authority: KR
Inventors: 김영길
Original assignee: 이헌조; 주식회사 금성사
Filing date: 1992-01-31
Publication date: 1993-08-30

Abstract

본 발명은 비디오 카세트 레코드에서 PAL방식과, SECAM 및 MESECAM 방식의 방송 시스템에 따라서 칼라신호의 처리 대역폭을 조절하여 기록 및 재생되는 영상신호의 화질을 향상시킬 수 있도록 하는 방송 시스템에 따른 화질향상 제어회로 에 관한 것으로 종래에는 PAL방식의 방송 시스템에 적합한 필터를 구성하여 PAL방식의 신호는 물론 SECAM 및 MESECAM 방식의 신호를 처리하였으므로 PAL방식의 신호는 정상으로 처리하여 기록 및 재생시 깨끗한 화면을 얻을 수 있으나, PAL방삭의 신호에 비하여 대역폭이 넓은 SECAM 및 MESECAM 방식의 신호는 필터의 처리대역폭이 좁으므로 각 칼라의 경계선 부근에서 칼라의 번짐이 심하게 발생하고, 화질이 선명하지 못하게 되어 사용자에게 불쾌감을 주었다.The present invention provides an image quality control circuit according to a broadcasting system that can improve the image quality of a video signal recorded and reproduced by adjusting a processing bandwidth of a color signal according to a PAL system and a SECAM and MESECAM broadcasting system in a video cassette record. In the related art, since a filter suitable for a PAL broadcasting system is configured to process PAL signals as well as SECAM and MESECAM signals, the PAL signals can be processed normally to obtain a clear screen during recording and playback. In the case of SECAM and MESECAM signals, which have a wider bandwidth than the signals of PAL, the processing bandwidth of the filter is narrow, which causes severe color bleeding around the boundary of each color, and the image quality is not clear.

본 발명 PAL방식과, SECM 및 MESECAM 방식의 신호에 따라 필터의 대역폭을 조절하여 칼라신호를 처리함으로써 SECM 및 MESECAM 방식의 신호에서도 화상의 카라번짐이 나타나지 않고, 화질이 선명하게 된다.By adjusting the bandwidth of the filter according to the PAL and SECM and MESECAM signals of the present invention, the color signals are processed and the image quality is clear even in SECM and MESECAM signals.

Description

Image quality control circuit according to broadcasting system

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 본 발명의 화질향상 제어회로도, 제2도의 (가)－(다)는 본 발명의 화질향상 제어회로에 의한 대역폭의 변호를 보인 파형도.1 is a diagram showing an image quality improvement control circuit of the present invention, and (a) to (c) of FIG. 2 are waveform diagrams showing bandwidth variation by the image quality control circuit of the present invention.

Claims

A filter 1 for detecting a color signal from the video signal VS with a PAL bandwidth and a bandwidth extension unit for extending the bandwidth of the filter 1 according to the SECAM / MESECAM mode signal SEC in a SECAM / MESECAM method. (2), an automatic color adjusting unit (3) for constantly adjusting the level of the color signal output by the filter (1) and outputting it to the luminance / color system, and a color signal (CS) input with a bandwidth of the SECAM / MESECAM signal. ), A filter 4 for converting the low frequency signal into a low pass signal, a buffer 5 for passing the output signal of the filter 4, a PAL mode signal PAH, a SECAM / MESECAM mode signal SEH, and a reproduction mode signal ( PBH and the recording mode signal (RECAH), the mode discrimination section 6 for discriminating whether the recording mode is in the PAL mode and the output signal of the filter 4 in accordance with the output signal of the mode discrimination section 6 are determined. An image enhancement control circuit according to a broadcasting system, characterized by comprising a trap unit (7) which is changed in a PAL manner.

※ Note: The disclosure is based on the initial application.