JPS5684005A - Fm demodulator - Google Patents

Fm demodulator

Info

Publication number
JPS5684005A
JPS5684005A JP16206779A JP16206779A JPS5684005A JP S5684005 A JPS5684005 A JP S5684005A JP 16206779 A JP16206779 A JP 16206779A JP 16206779 A JP16206779 A JP 16206779A JP S5684005 A JPS5684005 A JP S5684005A
Authority
JP
Japan
Prior art keywords
phase
filter
signal
supplied
frequency
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
JP16206779A
Other languages
Japanese (ja)
Inventor
Teruo Sato
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP16206779A priority Critical patent/JPS5684005A/en
Publication of JPS5684005A publication Critical patent/JPS5684005A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE:To prevent a tracking filter from having an offset by comparing the phase of an FM signal with that of the output signal of the filter and by using the comparison output as a control signal for the filter. CONSTITUTION:Tracking filter 3 has phase characteristics 3P to frequency characteristics 3F, namely, leading in phase (theta) by 90 deg. at center frequency fc and decreasing in shift in phase (theta) corresponding to the frequency in the passing band of the filter. Further, intermediate frequency signal Si is supplied to phase-comparing circuit 12 and intermediate frequency signal Sj from filter 3 is also supplied to comparing circuit 12 to make a phase comparison, thereby outputting DC signal Sd whose level corresponds to the phase difference between signals Si and Sj. This signal Sd is supplied as control voltage Ea to filter 3 by way of amplifier 13 and adding circuit 11 to constitute phase control loop 10.
JP16206779A 1979-12-12 1979-12-12 Fm demodulator Pending JPS5684005A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16206779A JPS5684005A (en) 1979-12-12 1979-12-12 Fm demodulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16206779A JPS5684005A (en) 1979-12-12 1979-12-12 Fm demodulator

Publications (1)

Publication Number Publication Date
JPS5684005A true JPS5684005A (en) 1981-07-09

Family

ID=15747456

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16206779A Pending JPS5684005A (en) 1979-12-12 1979-12-12 Fm demodulator

Country Status (1)

Country Link
JP (1) JPS5684005A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983000974A1 (en) * 1981-08-31 1983-03-17 Ohta, Tomozo High-sensitivity fm demodulating system
EP0086838A1 (en) * 1981-08-31 1983-08-31 Oki Electric Industry Company, Limited High-sensitivity fm signal demodulation system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983000974A1 (en) * 1981-08-31 1983-03-17 Ohta, Tomozo High-sensitivity fm demodulating system
EP0086838A1 (en) * 1981-08-31 1983-08-31 Oki Electric Industry Company, Limited High-sensitivity fm signal demodulation system
US4527187A (en) * 1981-08-31 1985-07-02 Oki Electric Industry Co., Ltd. High sensitivity FM signal demodulation system
EP0086838B1 (en) * 1981-08-31 1986-11-20 Oki Electric Industry Company, Limited High-sensitivity fm signal demodulation system

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