JPS6072072U

JPS6072072U - dropout compensator

Info

Publication number: JPS6072072U
Application number: JP16126983U
Authority: JP
Inventors: 加藤　利保
Original assignee: 株式会社東芝
Priority date: 1983-10-20
Filing date: 1983-10-20
Publication date: 1985-05-21

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 drawings]

第１図は従来のドロップアウト補償装置を示すブロック
図、第２図は従来の欠点を説明するための第１図の動作
波形図、第３図は本考案の一実施例に係るドロップアウ
ト補償装置を示すブロック図、第４図は本考案によって
得られるドロップアウト検出回路への入力信号を示す波
形図である。３・・・プリアンプ回路、４・・・リミッタ回路、５・
・・ＦＭ検波回路、６・・・ドロップアウト検出回路、
７・・・スイッチング回路、８・・・１水平周期遅延回
路、９・・・パルス伸長回路。FIG. 1 is a block diagram showing a conventional dropout compensation device, FIG. 2 is an operational waveform diagram of FIG. 1 to explain the drawbacks of the conventional device, and FIG. 3 is a dropout compensation device according to an embodiment of the present invention. FIG. 4 is a block diagram showing the device, and a waveform diagram showing input signals to the dropout detection circuit obtained by the present invention. 3... Preamplifier circuit, 4... Limiter circuit, 5...
...FM detection circuit, 6...dropout detection circuit,
7... Switching circuit, 8... 1 horizontal period delay circuit, 9... Pulse expansion circuit.

Claims

[Scope of utility model registration request]

A preamplifier circuit that amplifies the video signal detected from the video disc, a limiter circuit that has a gain control function and limits the amplitude of the video signal from this preamplifier circuit, and an FM detection circuit that inputs the limiter output of this circuit, respectively. and a dropout detection circuit, this FM detection circuit, and 1
A dropout compensation device comprising a switching circuit interposed between a horizontal period delay circuit and switched and controlled by the output of the dropout detection circuit,
1. A dropout compensating device, characterized in that the output of the dropout detection circuit is fed back into the gain control terminal of the limiter circuit via a pulse expansion circuit.