JPS5769508A - Fm demodulating circuit - Google Patents

Fm demodulating circuit

Info

Publication number
JPS5769508A
JPS5769508A JP55144385A JP14438580A JPS5769508A JP S5769508 A JPS5769508 A JP S5769508A JP 55144385 A JP55144385 A JP 55144385A JP 14438580 A JP14438580 A JP 14438580A JP S5769508 A JPS5769508 A JP S5769508A
Authority
JP
Japan
Prior art keywords
signal
carrier
lpf22
inputted
phase
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
JP55144385A
Other languages
Japanese (ja)
Inventor
Hiroyuki Kimura
Shinichi Ohashi
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 JP55144385A priority Critical patent/JPS5769508A/en
Publication of JPS5769508A publication Critical patent/JPS5769508A/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 demodulate an FM signal, reproduced by a low-carrier FM type recoder, with less distortion, by extracting and adding the carrier components of the FM signal and by emphasizing the carrier components. CONSTITUTION:An FM signal having unbalance between both side-bands of a low carrier FM system is inputted to a limiter amplifier 2 after a signal in a unnecesary band is eliminated by a BPF1. After limiter amplification, the FM signal is inputted to the phase-locked loop PLL consisting of a phase comparator 21, an LPF22 and a voltage-controlled oscillator 23. Then, the LPF22 performs sufficient attenuation to a modulation frequency to put the oscillation signal of the voltage-controlled oscillator 23 in the same phase with the FM signal carrier of the input. A carrier extracted by the PLL Is added to the original FM signal to emphasize only the carrier signal. Then, the output of the adder 22 is detected by a detector 3 to perform distortion-free demodulation. Thus, the modulation is carried out with less distortion.
JP55144385A 1980-10-17 1980-10-17 Fm demodulating circuit Pending JPS5769508A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55144385A JPS5769508A (en) 1980-10-17 1980-10-17 Fm demodulating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55144385A JPS5769508A (en) 1980-10-17 1980-10-17 Fm demodulating circuit

Publications (1)

Publication Number Publication Date
JPS5769508A true JPS5769508A (en) 1982-04-28

Family

ID=15360898

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55144385A Pending JPS5769508A (en) 1980-10-17 1980-10-17 Fm demodulating circuit

Country Status (1)

Country Link
JP (1) JPS5769508A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60184375U (en) * 1984-05-17 1985-12-06 三洋電機株式会社 Video signal correction circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60184375U (en) * 1984-05-17 1985-12-06 三洋電機株式会社 Video signal correction circuit
JPH0427262Y2 (en) * 1984-05-17 1992-06-30

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