JPS6056938U

JPS6056938U - Reference signal switching device for servo circuit in recording and reproducing equipment

Info

Publication number: JPS6056938U
Application number: JP14737083U
Authority: JP
Inventors: 幸男小川; 浩司松村
Original assignee: 日本ビクター株式会社
Priority date: 1983-09-22
Filing date: 1983-09-22
Publication date: 1985-04-20
Also published as: JPH0115007Y2

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図は一般的な電子編集システムの一例を示すブロッ
ク系統図、第２図は本考案装置の一実施例を示すブロッ
ク系統図、第３図及び第４図は夫々本考案装置を適用し
得る記録再生装置の一例の外観を示す斜視図及び部分拡
大正面図、第５図Ａ−Ｈ及び第６図Ａ〜Ｆは夫々第２図
図示ブロック系統の動作説明用タイムチャート、第７図
は本考案装置よりの基準信号が供給されるキャプスタン
サーボ回路の一例を示すブロック系統図、第８図は本考
案装置よりの基準信号が供給されるヘッドサーボ回路の
一例を示すブロック系統図、第９図は本考案装置の動作
を示すフローチャートである。１・・・再生装置、２Ｖ、９Ｖ・・・再生映像信号出力
端子、２Ａ、９Ａ・・・再生音声信号出力端子、５・・
・記録再生装置、６Ｖ、２５・・・外部入力映像信号（
再生映像信号）入力端子、７，１０・・・モニタ装置、
１１〜１３．２６・・・外部同期信号入力端子、１５・
・・切換スイッチ、１７・・・第１のスイッチ回路、２
０・・・記録再生装置、２１・・・シンクスイッチ、２
７．２８・・・同期分離回路、３２．３９・・・整流回
路、３４・・・垂直同期信号分離用低域フィルタ、４０
・・・第２のスイッチ回路、５４・・・スイッチ回路、
５９・・・基準信号出力端子、６０・・・フレーミング
サーボスイッチ、６１．８５・・・基準信号入力″端子
、６５・・・コントロールヘッド、６７・・・キャプス
タンモータ、６８，１０１・・・周波数発電機（ＦＧ）
、８１，１０４・・・モータ駆動増幅器（ＭＤＡ）、８
７・・・位相比較器、８８・・・ヘッドモータ、８９・
・・ピックアップヘッド、１０６・・・水晶発振器。Fig. 1 is a block system diagram showing an example of a general electronic editing system, Fig. 2 is a block system diagram showing an embodiment of the device of the present invention, and Figs. 5A-H and 6A-F are respectively a time chart for explaining the operation of the block system shown in FIG. 2, and FIG. FIG. 8 is a block system diagram showing an example of a capstan servo circuit to which the reference signal from the device of the present invention is supplied; FIG. FIG. 9 is a flowchart showing the operation of the device of the present invention. 1... Playback device, 2V, 9V... Playback video signal output terminal, 2A, 9A... Playback audio signal output terminal, 5...
・Recording/playback device, 6V, 25...external input video signal (
playback video signal) input terminal, 7, 10...monitor device,
11-13.26...External synchronization signal input terminal, 15.
... Selector switch, 17... First switch circuit, 2
0...Recording/reproducing device, 21...Sync switch, 2
7.28... Synchronization separation circuit, 32.39... Rectification circuit, 34... Low-pass filter for vertical synchronization signal separation, 40
. . . second switch circuit, 54 . . . switch circuit,
59... Reference signal output terminal, 60... Framing servo switch, 61.85... Reference signal input'' terminal, 65... Control head, 67... Capstan motor, 68, 101... Frequency generator (FG)
, 81, 104... motor drive amplifier (MDA), 8
7... Phase comparator, 88... Head motor, 89...
...Pickup head, 106...Crystal oscillator.

Claims

[Scope of utility model registration request]

In a device that switches the reference signal of the phase control system of each of the capstan servo circuit and the head servo circuit of a recording and reproducing device that records and reproduces signals on a magnetic tape run by a capstan with a rotating head, when an internal mode is selected. a changeover switch that outputs a signal; a first switch circuit that switches between recording mode and playback mode and selectively outputs the signal of the changeover switch only in playback mode; An oscillation circuit that outputs oscillation and an output signal of the first switch circuit selects and outputs the output signal of the oscillation circuit as the reference signal, and in the recording mode in which no signal is output from the first switch circuit, external Reference signal switching of a servo circuit in a recording/reproducing apparatus comprising a second switch circuit that selects and outputs a vertical synchronizing signal in an input video signal or a frequency-divided signal thereof as the reference signal with priority over an output signal of the oscillation circuit. Device.