JPS56164685A - Audio signal recording circuit - Google Patents

Audio signal recording circuit

Info

Publication number
JPS56164685A
JPS56164685A JP6784180A JP6784180A JPS56164685A JP S56164685 A JPS56164685 A JP S56164685A JP 6784180 A JP6784180 A JP 6784180A JP 6784180 A JP6784180 A JP 6784180A JP S56164685 A JPS56164685 A JP S56164685A
Authority
JP
Japan
Prior art keywords
audio signal
modulation
frequency
signal
output signal
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
JP6784180A
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 JP6784180A priority Critical patent/JPS56164685A/en
Publication of JPS56164685A publication Critical patent/JPS56164685A/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 make sure a sufficient frequency shift and stability of an FM modulation center frequency, by N-multiplying an FM modulation audio signal after frequency-coverting said audio signal by using a quartz oscillator output signal having very high frequency stability. CONSTITUTION:4.5MHz FM modulation audio signal inputted from an input terminal 1 is frequency-converted 3 by using an output signal of 4.2MHz quartz oscillator 2. In the output signal of the converter 3, an FM modulation audio signal having 4.5MHz+ or -4.2MHz as the carrier wave center frequency is obtained, and the frequency shift of a 0.3MHz FM modulation audio signal obtained as the output signal of a filter 4 is + or -25KHz equal to that of the 4.5MHz FM modulation audio signal of input signal. The output signal of the filter 4 is inputted to a 4-multiplier 5 and converted to an FM modulation signal having the 1.2MHz carrier wave center frequency.
JP6784180A 1980-05-23 1980-05-23 Audio signal recording circuit Pending JPS56164685A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6784180A JPS56164685A (en) 1980-05-23 1980-05-23 Audio signal recording circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6784180A JPS56164685A (en) 1980-05-23 1980-05-23 Audio signal recording circuit

Publications (1)

Publication Number Publication Date
JPS56164685A true JPS56164685A (en) 1981-12-17

Family

ID=13356572

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6784180A Pending JPS56164685A (en) 1980-05-23 1980-05-23 Audio signal recording circuit

Country Status (1)

Country Link
JP (1) JPS56164685A (en)

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