JPS58183658U

JPS58183658U - Control signal recording and reproducing device

Info

Publication number: JPS58183658U
Application number: JP7904382U
Authority: JP
Inventors: 草川　豊
Original assignee: 日本電気ホームエレクトロニクス株式会社
Priority date: 1982-05-31
Filing date: 1982-05-31
Publication date: 1983-12-07

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図は本発明の一実施例回路図、第２図は第１図を説
明するためのタイミングチャートである。　　−２〜５
・・・スイッチ回路、６．７・・・増幅器、８・・・ア
ンドゲート回路、９−．１１・・・モノステーブルマル
チバイブレーク、１２・・・ピーク整流回路、１３・・
・モード選択回路、１４・・・サーボ回路、１５・・・
リレー回路。FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a timing chart for explaining FIG. 1. -2~5
...Switch circuit, 6.7...Amplifier, 8...And gate circuit, 9-. 11... Monostable multi-bi break, 12... Peak rectifier circuit, 13...
・Mode selection circuit, 14... Servo circuit, 15...
relay circuit.

Claims

[Claim for Utility Model Registration] Video signal information is recorded or reproduced by a rotating head on a magnetic tape running at a first tape speed, and during recording, a vertical synchronization signal separated from the video signal is passed through a frequency dividing circuit. A reference pulse is formed, a differential pulse of the reference pulse is used to control the servo of the rotary head, and the reference pulse is recorded on a control track of the magnetic tape through a fixed magnetic head, and during reproduction, the reference pulse recorded on the magnetic tape is A reference pulse is extracted as a differential pulse by the fixed magnetic head, the servo of the rotary head is controlled by the differential pulse, and fast forwarding or rewinding is performed at a second tape speed faster than the first tape speed, so that the magnetic tape is In a magnetic recording and reproducing apparatus that runs with the fixed magnetic head in contact with a control track, the pulse width of the reference pulse of the frequency dividing circuit is set to a first tape speed when video signal information being recorded is to be reproduced at a first tape speed. a time constant of the frequency dividing circuit such that when the video signal information being recorded is to be reproduced at the second tape speed, the pulse width is set to a second pulse width wider than the first pulse width; and a pulse width selection circuit that selects a pulse width that is triggered by a reproduction differential pulse corresponding to the leading edge of the reference pulse during reproduction and has a pulse width that matches the pulse width from the leading edge to the trailing edge differential pulse. A monostable multi-vibrator is generated by selectively setting a time constant according to the playback tape speed, and when the output of the monostable multivibrator during the stable period and the playback differential pulse at the trailing edge of the reference pulse match, the output is set as described above. 1. A control signal recording/reproducing device comprising: a gate circuit for extracting a detection pulse as a control signal for setting the running speed of a magnetic tape to a second tape speed.