JPS60150864U

JPS60150864U - Audio signal recording and playback device

Info

Publication number: JPS60150864U
Application number: JP3912484U
Authority: JP
Inventors: 菱田　英二郎
Original assignee: 三洋電機株式会社
Priority date: 1984-03-19
Filing date: 1984-03-19
Publication date: 1985-10-07

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図は本考案実施例の回路ブロック図、第２図はノイ
ズリダクション回路の回路ブ爾ツク図、第３図はノイズ
リダクション回路のエンコード特性を示す図、第４図、
第５図は従来例の欠点を示す波形図である。２０・・・エンコーダ、２１・・・ＦＭ変調器、２３゜
２４・・・記録再生ヘッド、２８・・・スイッチング手
段、２９・・・ＦＭ復調器、３１・・・前値保持回路、
３５・・・デコーダ、１６・・・第２の前値保持回路。第１図Fig. 1 is a circuit block diagram of an embodiment of the present invention, Fig. 2 is a circuit block diagram of a noise reduction circuit, Fig. 3 is a diagram showing the encoding characteristics of the noise reduction circuit, Fig. 4,
FIG. 5 is a waveform diagram showing the drawbacks of the conventional example. 20... Encoder, 21... FM modulator, 23° 24... Recording/reproducing head, 28... Switching means, 29... FM demodulator, 31... Previous value holding circuit,
35... Decoder, 16... Second previous value holding circuit. Figure 1

Claims

[Scope of utility model registration request]

An encoder that compresses an audio signal, and an F that creates an FM audio signal by FM modulating a carrier using the output of the encoder.
an M modulator, a rotary head device for recording the FM audio signal on a tape by a plurality of rotary heads and reproducing the FM audio signal by the plurality of rotary heads; a switching means for selecting and serializing switching by an RF switch pulse related to the rotation of the rotary head device; an FM demodulator for creating a demodulated audio signal by the output of the switching means; and the switching included in the demodulated audio signal. Previous value holding means removes noise generated by selection by holding the level immediately before the noise for a predetermined period of time based on the iJF switching pulse, and a decoder having characteristics opposite to the encoder that expands the output of the previous value holding means. An audio signal recording and reproducing apparatus comprising: a second holding means for holding a previous value for a predetermined period of time based on the RF switching pulse, provided before the encoder.