KR970019480A

KR970019480A - Horizontal sync frequency automatic control device of playback screen in super impose screen mode

Info

Publication number: KR970019480A
Application number: KR1019950032819A
Authority: KR
Inventors: 임일선
Original assignee: 배순훈; 대우전자주식회사
Priority date: 1995-09-29
Filing date: 1995-09-29
Publication date: 1997-04-30

Abstract

본 발명은 슈퍼 임포우즈 화면 모드시 재생화면의 수평 동기 주파수 자동 조절 장치에 관한 것으로, 외부화면이 입력되는 외부화면 입력부(1), 상기 외부화면 입력부(1)로부터 색과 휘도를 분리시키는 색신호 및 휘도신호 분리부(2), 상기 외부화면 입력부(1)로부터 수평동기를 분리시키는 수평동기 분리부(3), 상기 수평동기 분리부(3)의 출력을 선택하는 스위칭부(4), 재생화면이 입력되는 재생화면 입력부(5), 상기 재생화면 입력부(5)로부터 수평동기를 분리시키는 수평동기 분리부(6), 외부화면과 재생화면의 위상을 비교하는 위상 비교부(7), 상기 위상 비교부(7)의 위상 검출 신호를 입력받아 PLL을 제어하는 PLL제어부(8), 상기 재생화면 입력부의 출력을 디코딩시키는 디코더(9), 상기 디코더(9)의 신호로부터 색차신호를 발생시키는 색차신호 발생부(10), 상기 PLL제어부(8)로부터의 수평동기신호와 색신호 및 휘도신호 분리부(2)로부터의 색신호, 휘도신호 및 색차신호 발생부(10)로부터의 B-Y, R-Y신호를 입력받아 슈퍼 입포우즈 재생화면을 출력시키는 슈퍼 임포우즈 인코더(11)를 포함하여 구성되는 장치에 있어서, 상기 수평동기 발생부(4)의 정확한 수평동기 발생을 제어할 수 있는 수평 동기 자동 조절부(20)를 더 구비하여 이루어진다.The present invention relates to an apparatus for automatically adjusting a horizontal sync frequency of a playback screen in a super impose screen mode, comprising: an external screen input unit (1) to which an external screen is input, a color signal separating color and luminance from the external screen input unit (1); A luminance signal separation unit 2, a horizontal synchronization separation unit 3 for separating horizontal synchronization from the external screen input unit 1, a switching unit 4 for selecting an output of the horizontal synchronization separation unit 3, and a playback screen The inputted reproduction screen input unit 5, the horizontal synchronization separating unit 6 for separating horizontal synchronization from the reproduction screen input unit 5, the phase comparing unit 7 for comparing the phase of the external screen and the reproduction screen, and the phase A PLL controller 8 for controlling the PLL by receiving the phase detection signal of the comparator 7, a decoder 9 for decoding the output of the reproduction screen input unit, and a color difference for generating a color difference signal from the signal of the decoder 9 Signal generator 10, the Outputs a super input-focus reproduction screen by receiving the horizontal synchronization signal from the PLL controller 8, the color signal from the color signal and the luminance signal separation unit 2, the BY and RY signals from the color signal generation unit 10, and the like. In the device configured to include a super impose encoder (11), the horizontal synchronization generating unit 4 is further provided with a horizontal synchronization automatic adjustment unit 20 that can control the accurate horizontal synchronization generation.

Description

Horizontal sync frequency automatic control device of playback screen in super impose screen mode

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

제2도는 본 발명에 따른 슈퍼 임포우즈 화면 모드시 재생화면의 수평 동기 주파수 자동 조절 장치의 블럭도.2 is a block diagram of a device for automatically adjusting a horizontal sync frequency of a playback screen in a super impose screen mode according to the present invention.

Claims

A device for automatically adjusting a horizontal sync frequency of a playback screen in a super impose screen mode including a horizontal sync generator (4) for generating horizontal sync by itself, which controls accurate horizontal sync generation of the horizontal sync generator (4). Schmitt trigger circuit 21 to achieve two safety conditions according to the amplitude of the input signal, the switch SW2 switched on / off by the Schmitt trigger circuit 21, the switch on the switch SW2 The horizontal synchronization frequency automatic adjustment device of the playback screen in the super impose screen mode, characterized in that further comprising a horizontal synchronization automatic adjustment unit 20 consisting of a resistor (R1-R3) that the voltage distribution according to the / off state.

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