JPH0164273U

JPH0164273U -

Info

Publication number: JPH0164273U
Application number: JP1987158735U
Authority: JP
Priority date: 1987-10-19
Filing date: 1987-10-19
Publication date: 1989-04-25

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例の回路構成図、第２
図は動き適応型Ｙ／Ｃ分離部の主要部分の回路ブ
ロツク図である。１００……前段部、５，１２……Ａ／Ｄ変換器
、６……同期分離回路、７……帯域通過フイルタ
、８……ＡＰＣ回路、９……クロツク発生回路、
１１……同期発生回路、１０Ａ，１０Ｂ……切換
スイツチ、２００……動き適応型Ｙ／Ｃ分離部、
２２……１ラインメモリ、２３……１フイールド
メモリ、２４，２５，２７……減算回路、２６，
２８……帯域通過フイルタ、１０Ｃ，１０Ｅ……
切換スイツチ、１０Ｄ，１０Ｆ……スイツチ、３
２，３３……Ｄ／Ａ変換器。 Figure 1 is a circuit configuration diagram of an embodiment of the present invention;
The figure is a circuit block diagram of the main parts of the motion adaptive Y/C separator. 100... Front stage section, 5, 12... A/D converter, 6... Synchronization separation circuit, 7... Band pass filter, 8... APC circuit, 9... Clock generation circuit,
11... Synchronization generation circuit, 10A, 10B... Changeover switch, 200... Motion adaptive Y/C separation unit,
22...1 line memory, 23...1 field memory, 24, 25, 27...subtraction circuit, 26,
28...Band pass filter, 10C, 10E...
Changeover switch, 10D, 10F...Switch, 3
2, 33...D/A converter.

Claims

[Scope of claims for utility model registration] (1) NTSC composite video signal (NTSC signal)
In addition to input, luminance signal ( _Y0 signal) and color signal (C
This is a Y/C separation circuit that shares a part of the circuit for inputting another system video signal in a format in which _{the 0} signal is separated, and consists of a motion adaptive Y/C separation section and its preceding section. A first path for A/D conversion between the NTSC signal and the _Y0 signal via a switch as a transmission path to the motion adaptive Y/C separator, a second path for A/D conversion of the _C0 signal, and a synchronization generation circuit which receives the signal after the changeover switch of the first path and generates a synchronization signal/timing pulse, and the input to the APC circuit in the synchronization generation circuit is changed to the _C0 signal by the changeover switch. The motion adaptive Y/C separator is equipped with a comb filter that utilizes one line memory and one field memory, and separates and outputs the C signal in accordance with the motion. Subtract the C signal from the signal,
In a circuit that outputs a Y signal, when a separate video signal is input, the subtraction is stopped and the first path
It is equipped with a switch-based switching means that directly outputs the _Y0 signal and _C0 signal input through the second path to the output terminal, and the various switches in the motion adaptive Y/C separation section in the front stage are A Y/C separation circuit characterized in that it operates in conjunction with each input of an NTSC signal and a separate video signal. (2) Claim 1 of the Utility Model Registration Claim, characterized in that a terminal is added for outputting the outputs of the motion-adaptive type Y/C separator in the above-mentioned Paragraph 1 via a D/A converter, respectively. Y/C separation circuit.