JPS6126385U

JPS6126385U - Video signal automatic switching device

Info

Publication number: JPS6126385U
Application number: JP11110884U
Authority: JP
Inventors: 薫夫阿部
Original assignee: 株式会社東芝
Priority date: 1984-07-24
Filing date: 1984-07-24
Publication date: 1986-02-17

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) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は本考案の映像信号自動切換装置の一実施例を示
したブロック図、第２図は第１図に示したパル／セカム
判別回路の詳細例を示したブロック図、第３図は第２図
に示したセラミックフィルタの周波数特性例を示した図
、第４図は従来のＭＥＳＥＣＡＭ方式の色信号記録再生
系を示した図、第５図は従来のフランスセカム方式の色
信号再生系を示した図である。２１・・・再生ヘヅド、２２・・・周波数逓倍器、２３
．２５・・・バンドパスフィルタ、２４．２８・・・乗
算器、２６・・・スイッチ、２７・・・自動周波数制御
回路、２９・・・基準信号発振器、３０．３１・・・パ
ル／セカム判別回路、３２・・・オア回路。FIG. 1 is a block diagram showing an embodiment of the automatic video signal switching device of the present invention, FIG. 2 is a block diagram showing a detailed example of the PAL/SECOM discrimination circuit shown in FIG. 1, and FIG. Figure 2 shows an example of the frequency characteristics of the ceramic filter, Figure 4 shows the color signal recording and reproducing system of the conventional MESECAM system, and Figure 5 shows the color signal reproduction of the conventional France Secam system. It is a diagram showing a system. 21... Reproduction head, 22... Frequency multiplier, 23
．． 25... Bandpass filter, 24.28... Multiplier, 26... Switch, 27... Automatic frequency control circuit, 29... Reference signal oscillator, 30.31... Pal/Secum discrimination Circuit, 32...OR circuit.

Claims

[Scope of utility model registration request]

(1) In a video signal automatic switching device used in a dual-triple VHS video tape recorder, a plurality of color signal playback circuits compatible with the recording system of the playback tape,
tape recording method detection means for detecting the recording method of a playback tape; and a color signal reproducing circuit for selecting an appropriate color signal reproducing circuit from among the plurality of color signal reproducing circuits based on a detection signal of the tape recording method detecting means. 1. A video signal automatic switching device, comprising: a selection means, and always automatically obtains a perfect reproduced color signal from an appropriate color signal reproduction circuit corresponding to the recording method of the reproduction tape.

(2) An image according to claim 1 of the utility model registration, characterized in that a mode switching signal generating means is provided for generating a mode switching signal of a signal system based on the detection signal of the tape recording method detecting means. Automatic signal switching device.

(3) As the plurality of color signal reproducing circuits, France'.
It has a SECAM frequency conversion playback circuit and a MESECAM frequency/number conversion playback circuit, and if the playback tape recording system is the PAL or ME SEC-AM system, the playback tape recording system is the Prance-SECAM system from the SECAM frequency conversion playback circuit. In this case, the video signal automatic switching device according to claim 1, wherein the reproduced color signals are respectively obtained from a French Secum frequency conversion reproduction circuit.