Delay-type FM demodulation circuit

Details Delay-type FM demodulation circuit Delay-type FM demodulation circuit

1996-10-16

1997-12-02

Mis, David

Demodulators

Frequency modulation demodulator

Input signal split into plural signals

360 30, 455214, H03D 300, H03D 306

Patent

active

056940807

ABSTRACT:
A delay-type FM demodulation circuit of this invention has an object to satisfactorily remove a harmonic wave in an arithmetic calculation output signal even if an LPF having relatively moderate stopping characteristics is used. The delay-type FM demodulation circuit includes first to third delay circuits for obtaining first to third signals obtained by times (e.g., 1/8, 1/4, and 3/8) which sequentially increase within a time shorter than 1/2 which is a signal period obtained when an FM-modulated input signal is positively deviated by a maximum frequency, a first multiplication circuit for multiplying the input signal and the first signal, a second multiplication circuit for multiplying the second signal and the third signal, and an addition circuit for adding an output signal from the first multiplication circuit and an output signal from the second multiplication circuit.

REFERENCES:
patent: 4064361 (1977-12-01), Kustka et al.
patent: 4320525 (1982-03-01), Woodward
patent: 4485448 (1984-11-01), Kurth
patent: 4549143 (1985-10-01), Bouland et al.
patent: 4656432 (1987-04-01), Matsumura
patent: 5185679 (1993-02-01), Mishima et al.

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