JPS5765902A - Fm demodulating circuit - Google Patents

Fm demodulating circuit

Info

Publication number
JPS5765902A
JPS5765902A JP14275280A JP14275280A JPS5765902A JP S5765902 A JPS5765902 A JP S5765902A JP 14275280 A JP14275280 A JP 14275280A JP 14275280 A JP14275280 A JP 14275280A JP S5765902 A JPS5765902 A JP S5765902A
Authority
JP
Japan
Prior art keywords
band
frequency
phase
phase difference
input
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
JP14275280A
Other languages
Japanese (ja)
Inventor
Kazuyuki Suenaga
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.)
Victor Company of Japan Ltd
Nippon Victor KK
Original Assignee
Victor Company of Japan Ltd
Nippon Victor KK
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 Victor Company of Japan Ltd, Nippon Victor KK filed Critical Victor Company of Japan Ltd
Priority to JP14275280A priority Critical patent/JPS5765902A/en
Priority to FR8119174A priority patent/FR2492188B1/en
Priority to GB8130851A priority patent/GB2089152B/en
Priority to DE19813140648 priority patent/DE3140648A1/en
Publication of JPS5765902A publication Critical patent/JPS5765902A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
    • H03D3/18—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by means of synchronous gating arrangements
    • H03D3/20—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by means of synchronous gating arrangements producing pulses whose amplitude or duration depends on phase difference
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
    • H03D2200/0001—Circuit elements of demodulators
    • H03D2200/0039—Exclusive OR logic circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
    • H03D2200/0041—Functional aspects of demodulators
    • H03D2200/0049—Analog multiplication for detection

Landscapes

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

Abstract

PURPOSE: To improve the resistance to noise, by providing a band-pass filter which has the characteristics of phase of frequency where the phase difference is 90° near the center frequency.
CONSTITUTION: In respect to band filter 5, the frequency pass band includes bands from the lower limit of the lower side-band of an input FM signal from an input terminal 1 up to the upper limit of the upper side-band, and the characteristics of phase of frequency is changed linearly approximately in a range of phase difference 0°∼180°, and the phase difference is 90° near a center frequency (f). Thus, side bands from the lower limit to the upper limit required for the input FM signal are included in the band of the frequency pass band characteristics to improve the resistance to noise, and the characteristics of phase frequency is changed linearly to prevent the occurrence of phase distortion in the demodulation output.
COPYRIGHT: (C)1982,JPO&Japio
JP14275280A 1980-10-13 1980-10-13 Fm demodulating circuit Pending JPS5765902A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP14275280A JPS5765902A (en) 1980-10-13 1980-10-13 Fm demodulating circuit
FR8119174A FR2492188B1 (en) 1980-10-13 1981-10-12 FREQUENCY MODULATED SIGNAL DEMODULATION CIRCUIT
GB8130851A GB2089152B (en) 1980-10-13 1981-10-13 Frequency-modulated signal demodulating circuit
DE19813140648 DE3140648A1 (en) 1980-10-13 1981-10-13 CIRCUIT ARRANGEMENT FOR DEMODULATING A FREQUENCY-MODULATED SIGNAL

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14275280A JPS5765902A (en) 1980-10-13 1980-10-13 Fm demodulating circuit

Publications (1)

Publication Number Publication Date
JPS5765902A true JPS5765902A (en) 1982-04-21

Family

ID=15322750

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14275280A Pending JPS5765902A (en) 1980-10-13 1980-10-13 Fm demodulating circuit

Country Status (4)

Country Link
JP (1) JPS5765902A (en)
DE (1) DE3140648A1 (en)
FR (1) FR2492188B1 (en)
GB (1) GB2089152B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5963807A (en) * 1982-08-30 1984-04-11 ウオング・ラボラトリ−ズ・インコ−ポレ−テツド Differential detector for demodulating fm or pm signal
JPS6021603A (en) * 1983-07-18 1985-02-04 Akiyufueezu Kk Fm demodulation circuit

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0143556B2 (en) * 1983-11-18 1996-03-06 Plessey Overseas Limited Improvements relating to frequency modulation detectors
GB2212017B (en) * 1987-12-17 1992-05-20 Mitsubishi Electric Corp Frequency demodulator
JP3003600B2 (en) * 1996-11-20 2000-01-31 日本電気株式会社 FM demodulation circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51131205A (en) * 1975-04-24 1976-11-15 Sony Corp A f c circuit

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3624523A (en) * 1969-09-19 1971-11-30 Hughes Aircraft Co Digital frequency discriminator
DE2206704B1 (en) * 1972-02-12 1973-08-30 Ted Bildplatten Ag Aeg-Telefunkenteldec, Zug (Schweiz) Time-of-flight demodulator for a frequency or phase-modulated carrier oscillation and its use when scanning recording media
JPS5233460A (en) * 1975-09-10 1977-03-14 Sony Corp Fm demodulator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51131205A (en) * 1975-04-24 1976-11-15 Sony Corp A f c circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5963807A (en) * 1982-08-30 1984-04-11 ウオング・ラボラトリ−ズ・インコ−ポレ−テツド Differential detector for demodulating fm or pm signal
JPS6021603A (en) * 1983-07-18 1985-02-04 Akiyufueezu Kk Fm demodulation circuit

Also Published As

Publication number Publication date
FR2492188A1 (en) 1982-04-16
FR2492188B1 (en) 1988-05-27
GB2089152B (en) 1984-09-12
GB2089152A (en) 1982-06-16
DE3140648A1 (en) 1982-06-24

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