JPS582740U

JPS582740U - Magnetic tape playback speed control device

Info

Publication number: JPS582740U
Application number: JP9383681U
Authority: JP
Inventors: 金井　幸臣; 猿渡　伸寛
Original assignee: 株式会社日立製作所
Priority date: 1981-06-26
Filing date: 1981-06-26
Publication date: 1983-01-08

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図は本考案の磁気テープの臀生走行速度制　′御装
置の一実施例を示すブロック図、第２図は第１図に示し
た再生走行速度自動制御装置の一具体例を示す回路図で
ある。１・・・基準信号発生器、４・・・位相比較器、５・・
・ディスク、リミネイタ、７・・・モータドライブアン
プ、　　　８・・・キャプスタンモータ、１０川キヤプ
スタン、１２・・・テープ、１３・・・同期分離回路、
１４・・・波形整形回路又はｆ／ｖ変換回路、１−５・
・・ＭＤＡ駆動信号制御回路、１６・・・再生走行速度
自動制御装置。Fig. 1 is a block diagram showing an embodiment of the magnetic tape hip running speed control device of the present invention, and Fig. 2 is a circuit diagram showing a specific example of the automatic playback running speed control device shown in Fig. 1. It is a diagram. 1... Reference signal generator, 4... Phase comparator, 5...
・Disk, liminator, 7... Motor drive amplifier, 8... Capstan motor, 10 River capstan, 12... Tape, 13... Synchronous separation circuit,
14... Waveform shaping circuit or f/v conversion circuit, 1-5.
... MDA drive signal control circuit, 16... Regeneration running speed automatic control device.

Claims

[Scope of utility model registration request]

(1) A means for comparing the playback running speed of the magnetic tape with a reference value and obtaining a control signal according to the difference, and a motor drive for driving and controlling the capstan motor and the capstan that are interlocked thereto based on the control signal. A magnetic tape playback running speed control device having an amplifier, a synchronization signal detection and determination circuit that detects and determines the presence or absence of a synchronization signal included in a reproduced video signal; an MD configured to supply a signal to a motor drive amplifier, and to supply a fast forward control signal corresponding to a speed equal to or higher than a standard playback traveling speed to the motor drive amplifier when a synchronization signal is not detected and determined;
A magnetic tape playback running speed control device, comprising: a drive signal control circuit.

(2) The means for obtaining the control signal further includes means for adding, to the control signal according to the difference, an output voltage signal of a frequency discrimination circuit that converts an FC signal obtained from the capstan into a voltage. A magnetic tape playback running speed control device according to claim 1 of the above-mentioned utility model registration claim.