JPS5750305A - Sound signal recording and reproducing circuit - Google Patents

Sound signal recording and reproducing circuit

Info

Publication number
JPS5750305A
JPS5750305A JP55123518A JP12351880A JPS5750305A JP S5750305 A JPS5750305 A JP S5750305A JP 55123518 A JP55123518 A JP 55123518A JP 12351880 A JP12351880 A JP 12351880A JP S5750305 A JPS5750305 A JP S5750305A
Authority
JP
Japan
Prior art keywords
modulator
demodulator
output signal
sound signal
signal recording
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP55123518A
Other languages
Japanese (ja)
Inventor
Yoshizumi Wataya
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP55123518A priority Critical patent/JPS5750305A/en
Publication of JPS5750305A publication Critical patent/JPS5750305A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/02—Analogue recording or reproducing
    • G11B20/06—Angle-modulation recording or reproducing

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

PURPOSE:To stabilize the center frequency of an FM modulator, by controlling a multivibrator type FM modulator by an average value voltage of the output signal of an FM demodulator at the recording time. CONSTITUTION:The output signal of an FM modulator 2 which was modulated by the sound signal from an input terminal 1 is supplied to a recording head 4 through a recording amplifier 3. Simultaneously, the output signal of the modulator 2 is supplied to an FM demodulator 9 through a contact (a) at the recording time. Change of the output DC voltage of this demodulator 9 is regarded as fluctuation of the center frequency of the modulator 2. A sound (b) and signal is removed from the output signal of the demodulator 9 by an LPF11 to extract only DC components, and they are fed back to the modulator 2, thereby stabilizing the center, frequency of the modulator 2.
JP55123518A 1980-09-08 1980-09-08 Sound signal recording and reproducing circuit Pending JPS5750305A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55123518A JPS5750305A (en) 1980-09-08 1980-09-08 Sound signal recording and reproducing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55123518A JPS5750305A (en) 1980-09-08 1980-09-08 Sound signal recording and reproducing circuit

Publications (1)

Publication Number Publication Date
JPS5750305A true JPS5750305A (en) 1982-03-24

Family

ID=14862591

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55123518A Pending JPS5750305A (en) 1980-09-08 1980-09-08 Sound signal recording and reproducing circuit

Country Status (1)

Country Link
JP (1) JPS5750305A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5639731A (en) * 1987-05-22 1997-06-17 Pripps Bryggerier Ab Amino acids for the preparation of a beverage

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4939412A (en) * 1972-08-12 1974-04-12

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4939412A (en) * 1972-08-12 1974-04-12

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5639731A (en) * 1987-05-22 1997-06-17 Pripps Bryggerier Ab Amino acids for the preparation of a beverage

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