JPS5880904A - Fm demodulating circuit - Google Patents

Fm demodulating circuit

Info

Publication number
JPS5880904A
JPS5880904A JP17952481A JP17952481A JPS5880904A JP S5880904 A JPS5880904 A JP S5880904A JP 17952481 A JP17952481 A JP 17952481A JP 17952481 A JP17952481 A JP 17952481A JP S5880904 A JPS5880904 A JP S5880904A
Authority
JP
Japan
Prior art keywords
pll
degree
demodulating circuit
control voltage
synchronism
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
JP17952481A
Other languages
Japanese (ja)
Inventor
Tsuneaki Matoba
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP17952481A priority Critical patent/JPS5880904A/en
Publication of JPS5880904A publication Critical patent/JPS5880904A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03DDEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/02Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
    • H03D3/24Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits
    • H03D3/241Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits the oscillator being part of a phase locked loop

Abstract

PURPOSE:To eliminate the generation of an impulse noise when the degree of control is large by applying a control voltage generated in accordance with the degree of modulation of an FM signal from the output of a PLL demodulating circuit to a loop filter, and controlling a synchronism range when an electric field is weak by said control voltage. CONSTITUTION:At the output of a PLL demodulating circuit 6, a control voltage corresponding to the degree of modulation of the carrier in an FM signal is generated and then applied to the loop filter 7 in the PLL demodulating circuit 6 to control the synchronism range of the PLL when an electric field is weak by said control voltage. Consequently, while an S/N ratio when the electric field is weak is improved by sufficient band compression, the synchronism range of the PLL is controlled in accordance with the level when the degree of modulation is large, thereby suppressing the generation of distortion due to an impulse noise.
JP17952481A 1981-11-06 1981-11-06 Fm demodulating circuit Pending JPS5880904A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17952481A JPS5880904A (en) 1981-11-06 1981-11-06 Fm demodulating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17952481A JPS5880904A (en) 1981-11-06 1981-11-06 Fm demodulating circuit

Publications (1)

Publication Number Publication Date
JPS5880904A true JPS5880904A (en) 1983-05-16

Family

ID=16067269

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17952481A Pending JPS5880904A (en) 1981-11-06 1981-11-06 Fm demodulating circuit

Country Status (1)

Country Link
JP (1) JPS5880904A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5416530A (en) * 1992-12-17 1995-05-16 Luly; Robert A. Video signal noise reduction circuit for a video demodulator comprising a PLL

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5416530A (en) * 1992-12-17 1995-05-16 Luly; Robert A. Video signal noise reduction circuit for a video demodulator comprising a PLL

Similar Documents

Publication Publication Date Title
ES8506952A1 (en) Controlled oscillator circuit.
JPH02113709A (en) Wide band modulation device for phase fixed loop and its method
GB1506687A (en) Undesired signal canceller
JPS5880904A (en) Fm demodulating circuit
JPS58131853A (en) Interference wave eliminating device
JPS56117405A (en) Fm modulation system
JPS56116337A (en) Fm receiver
JPS61136308A (en) Fm modulating circuit
JPS55140306A (en) Fm am direct converter
JPS57171808A (en) Fm demodulating circuit
JPS5752207A (en) Frequency modulation demodulating circuit
JPS60250780A (en) Horizontal synchronizing circuit
JPS5613853A (en) Band variable type timing reproducing circuit
JPS6460087A (en) Signal processing circuit
JPS58105604A (en) Phase locked type frequency modulator/demodulator circuit
JPS59225604A (en) Pulse count detector
JPS53131814A (en) Phase linear type emphasizer
JPS5896471A (en) Ghost eliminating device
DE2536796A1 (en) Stereo tuner low frequency noise suppression - has voltage controlled stage switching to high pass filter mode in presence of noise
JPS53102614A (en) Ssb receiver
JPS5366353A (en) Carrier reproducer
JPS6076846A (en) Carrier reproducing pll
JPS52123119A (en) Carrier wave supply unit of multi-direction multiple telephone system
JPS57155841A (en) Noise reduction device
JPS6022810A (en) Fm-am converter