FM Demodulator with variable bandpass filter

Details FM Demodulator with variable bandpass filter FM Demodulator with variable bandpass filter

1981-09-16

1984-07-03

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329139, 329140, 455205, 455266, H03D 300, H04B 110

Patent

active

044582072

ABSTRACT:
The demodulator combines a conventional frequency discriminator with a bandpass filter for removing the noise which is present from the band occupied at a given instant by the modulated signal. The center frequency of the bandpass filter is controlled in dependence on the instantaneous frequency of the modulated signal and its bandwidth b.sub.u is controlled in dependence on the instantaneous width of the band occupied by the modulated signal.

REFERENCES:
patent: 3218641 (1965-11-01), Maynard
patent: 3629716 (1971-12-01), Dimon
patent: 3978416 (1976-08-01), Sutphin, Jr.
patent: 4045740 (1977-08-01), Baker
patent: 4101837 (1978-07-01), Clayton, Jr. et al.
patent: 4339828 (1982-07-01), Chasek
patent: 4356568 (1982-10-01), Ogita et al.

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