JPS6064683U

JPS6064683U - Audio multiplex magnetic recording and reproducing device

Info

Publication number: JPS6064683U
Application number: JP15613983U
Authority: JP
Inventors: 三浦　邦昭; 義憲岡田; 福島　勇夫; 満工藤
Original assignee: 株式会社日立製作所
Priority date: 1983-10-11
Filing date: 1983-10-11
Publication date: 1985-05-08

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 the drawing]

第１図はテープパターン例を示すテープパターン図、第
２図はＦＭ音声多重時のスペクトラム◆ 図、第３図はＦＭ音声多重を実現するヘッド構成図、第
４図はＦＭ音声多重をした場合のテープパターン図、第
５図は従来の１Ｍ音音声型ＶＴＲの信号処理回路のブロ
ック図、第６図はＦＭ音声信号のり９７信号に対する妨
害を説明するためやスペクトラム図、・第７図体、本考
案の＝実施例を示すブロック図、第８図は、ダイナミッ
クディエンファシス特性や一例を示す図、第９図は、ダ
イナミックディエンファシス回路の一興体例を示す回゛
略図、１第１０図は本考案の他の実施例のブロック図、
第１１図はダイナミックディエンファシス回路の他の具
体例を示す回路図である。　　　　　　　　　４、・・
・ＦＭ輝度信号、５・・・低域変換クロマ信号、６・・
・ＦＭ音声信号、２９・・・ドロップアウト検出回　。路、３０・・・ダイナミックディエンファシス回路、３
１・・・スイッチ、３２・・・クロマキヤリアトラップ
、３３・・・リミシタ、３４・・・ダイオード、３５・
・・トランジスタスイッチ。 −／３１５″ −２３，２４７゜ｌ？−２θFigure 1 is a tape pattern diagram showing an example of a tape pattern, Figure 2 is a spectrum diagram when FM audio is multiplexed, Figure 3 is a head configuration diagram that realizes FM audio multiplexing, and Figure 4 is when FM audio is multiplexed. Figure 5 is a block diagram of the signal processing circuit of a conventional 1M audio VTR; Figure 6 is a spectrum diagram for explaining interference with the 97 FM audio signal; Figure 7 is a diagram of the signal processing circuit; Figure 8 is a block diagram showing an embodiment of the invention; Figure 8 is a diagram showing dynamic de-emphasis characteristics and an example; Figure 9 is a circuit diagram showing an example of a dynamic de-emphasis circuit; 1 Figure 10 is a diagram showing an example of the dynamic de-emphasis circuit; A block diagram of another embodiment of
FIG. 11 is a circuit diagram showing another specific example of the dynamic de-emphasis circuit. 4,...
・FM luminance signal, 5...Low frequency conversion chroma signal, 6...
・FM audio signal, 29...Dropout detection times. Road, 30... Dynamic de-emphasis circuit, 3
DESCRIPTION OF SYMBOLS 1... Switch, 32... Chroma carrier trap, 33... Limiter, 34... Diode, 35...
...Transistor switch. -/315″ -23,247゜l?-2θ

Claims

[Scope of utility model registration request]

(1) A magnetic recording and reproducing device that multiplex-records an FM audio signal in a frequency band between an FM luminance signal and a low-frequency converted chroma signal, comprising a dynamic de-emphasis circuit inserted in the chroma signal reproduction system, When a reproduced FM audio signal exists, the two dynamic de-emphasis circuits are turned on, and when there is no reproduced FM audio signal, the dynamic de-emphasis circuit is turned off or passed. -Audio multiplex magnetic recording and reproducing device.

(2) The audio multiplex magnetic recording and reproducing apparatus as set forth in claim 1 of the utility model registration claim, characterized in that a drop error 1 detection circuit is provided in the FM audio signal reproduction system to detect the presence or absence of an Fi audio signal. .