JPS6055171U

JPS6055171U - Horizontal synchronization signal generation circuit

Info

Publication number: JPS6055171U
Application number: JP14703183U
Authority: JP
Inventors: 弘之中西
Original assignee: 三洋電機株式会社
Priority date: 1983-09-22
Filing date: 1983-09-22
Publication date: 1985-04-18

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来の輝度信号再生回路のブロック　　−図、
第２図は同期分離回路の具体的回路図、第３図は同期分
離に用いる輝度信号のＦＭ復調後の波形図、第４図は本
考案の一実施例における輝度信号再生回路のブロック図
、第５図は遅延線の通過帯域特性図、第６図は、本実施
例における同期分離に用いる輝度信号のＦＭ復調後の波
形図である。主な図番の説明、６・・・ＩＨ遅延線、１１・・・くし
形ノイズキャンセラ、１３・・・同期分離回路。Figure 1 is a block diagram of a conventional luminance signal regeneration circuit.
FIG. 2 is a specific circuit diagram of a sync separation circuit, FIG. 3 is a waveform diagram of a luminance signal used for sync separation after FM demodulation, and FIG. 4 is a block diagram of a luminance signal regeneration circuit in an embodiment of the present invention. FIG. 5 is a passband characteristic diagram of a delay line, and FIG. 6 is a waveform diagram of a luminance signal used for synchronization separation in this embodiment after FM demodulation. Explanation of main figure numbers, 6...IH delay line, 11...Comb-shaped noise canceller, 13...Sync separation circuit.

Claims

[Scope of utility model registration request]

a first FM demodulation circuit that FM demodulates the reproduced FM luminance signal;
has a predetermined passband characteristic, and the reproduced FM luminance signal is
an IH delay line that delays by H, a second FM demodulation circuit that FM demodulates the output of the IH delay line, a first subtraction circuit that extracts a difference signal between the outputs of the first and second FM demodulation circuits, and an output of the first subtraction circuit. A luminance signal reproducing circuit comprising: a limiter that limits the amplitude; and a second subtracting circuit that extracts a difference signal between the output of the first FM demodulation circuit and the output of the limiter, and outputting the output of the second subtracting circuit as a reproduced luminance signal. , said 2nd FM
A horizontal synchronization signal generation circuit characterized by separating a horizontal synchronization signal from a demodulation circuit output.