JPS5942517U

JPS5942517U - magnetic recording and reproducing device

Info

Publication number: JPS5942517U
Application number: JP13667382U
Authority: JP
Inventors: 徹夫高橋
Original assignee: 株式会社ケンウッド
Priority date: 1982-09-10
Filing date: 1982-09-10
Publication date: 1984-03-19
Also published as: JPS641821Y2

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 drawings]

第１図は本考案の一実施例を示すブロック図。第２図は本考案の一実施例の作用の説明に供する波形図
。第３図は本考案の一実施例における記録、信号の周波
数帯域の分布を示す図。１および１５・・・・・・信号処理回路、２・・・・・
・周波数変調器、３・・・・・・スイッチ回路、４・・
・・・・加算回路、５・・・・・・回転ドラム、６およ
び７・・・・・・磁気ヘッド、８・・・・・・垂直同期
信号分離回路、９・・・・・・遅延回路、１０．２３お
よび２６・・・・・・単安定マルチバイブレーク、１４
・・・・・・切替スイッチ回路、１６・・・・・・バン
ドパスフィルタ、１７・・・・・・復調回路、１８およ
び２７・・・・・・位相比較器、１９・・・・・・電圧
制御発振器、２１および２８・・・・・・ローパスフィ
ルタ、２２・・・・・・ミュート回路、２４および２５
・・・・・・フリップフロップ、３０・・・・・・ウィ
ンド已ンパレータ、３２・・・・・・コンパレータ。FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 is a waveform diagram for explaining the operation of an embodiment of the present invention. FIG. 3 is a diagram showing the distribution of recording and signal frequency bands in one embodiment of the present invention. 1 and 15...signal processing circuit, 2...
・Frequency modulator, 3...Switch circuit, 4...
... Addition circuit, 5 ... Rotating drum, 6 and 7 ... Magnetic head, 8 ... Vertical synchronization signal separation circuit, 9 ... Delay Circuits, 10.23 and 26... Monostable multibibreak, 14
......Changing switch circuit, 16...Band pass filter, 17...Demodulation circuit, 18 and 27...Phase comparator, 19...・Voltage controlled oscillator, 21 and 28...Low pass filter, 22...Mute circuit, 24 and 25
...Flip-flop, 30...Window comparator, 32...Comparator.

Claims

[Scope of utility model registration request]

One field of an audio signal which has at least two magnetic heads and is a composite of a signal processed for recording a composite color television signal on a magnetic tape and a frequency modulated audio signal obtained by frequency modulating the audio signal. In a magnetic recording/reproducing device that sequentially records data over a range exceeding 100 nm using different recording tracks via a magnetic head, when recording the composite signal, the frequency modulated audio is recorded in relation to the vertical synchronization signal in the composite color television signal. a missing part creating means for creating a missing part in a signal; a frequency modulator for changing the carrier frequency of the frequency modulated audio signal sandwiching the missing part; and a detecting means for detecting the missing part of the frequency modulated audio signal during reproduction; a switching means for switching the output signal of the magnetic head in synchronization with the output signal of the detection means; and a switching means for changing the center frequency corresponding to the carrier wave frequency in synchronization with the output signal of the detection means, and an output signal of the detection means. 1. A magnetic recording and reproducing apparatus comprising: a frequency-modulated audio signal demodulation circuit in which the amount of change in the center frequency is controlled by a synchronous detection output signal obtained by synchronously detecting the center frequency and the demodulation output signal.