JPS58179662U

JPS58179662U - random access circuit

Info

Publication number: JPS58179662U
Application number: JP7552282U
Authority: JP
Inventors: 隆井上
Original assignee: 株式会社東芝
Priority date: 1982-05-21
Filing date: 1982-05-21
Publication date: 1983-12-01

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図は従来のランダム・アクセス回路のプロ　　−ツ
ク図、第２図は本考案に係るランダム・アクセス回路の
ブロック図、−第３図は第２図に示した指示値近傍ピッ
クアップ部送り量コード信号発生回路の一例を示すブロ
ック図、第４図は第２図に示したデコーダの一例を示す
ブロック図、第５図は指示値近傍ピックアップ部送り動
作を説明する説明図である。１１・・・現在値、１２・・・指示値、１３・・・減算
器、１５・・・デコーダ、１７・・・ピックアップ部駆
動回路、２０・・・コード信号有無検出回路、２２・−
・指示値近傍ピックアップ部送り量コード信号発生回路
。Fig. 1 is a block diagram of a conventional random access circuit, Fig. 2 is a block diagram of a random access circuit according to the present invention, - Fig. 3 is a pickup section feed amount near the indicated value shown in Fig. 2. FIG. 4 is a block diagram showing an example of a code signal generation circuit, FIG. 4 is a block diagram showing an example of the decoder shown in FIG. 2, and FIG. 5 is an explanatory diagram illustrating the operation of feeding the pickup unit near the indicated value. DESCRIPTION OF SYMBOLS 11...Current value, 12...Instruction value, 13...Subtractor, 15...Decoder, 17...Pickup part drive circuit, 20...Code signal presence/absence detection circuit, 22.-
・Feed amount code signal generation circuit for pick-up section near indicated value.

Claims

[Scope of utility model registration request]

A pickup unit driving circuit for detecting and reproducing a signal recorded on a recording medium by moving the pickup unit, and a current value indicating the current position of the pickup unit and an instruction value indicating a designated position. a subtracter for comparison; a decoder for decoding the comparison output of the subtracter and moving the pickup section drive circuit according to the output;
A code signal presence/absence detection circuit for detecting the presence or absence of a code signal in the reproduced signal when the pickup section moves to the target position, and a code signal presence/absence detection circuit for detecting the presence or absence of a code signal in the reproduced signal; A random section feed amount code signal generation circuit for generating a signal for moving a predetermined amount nearby and sending this signal to the decoder.
access circuit.