Digital delay FM demodulator with filtered noise dither

Details Digital delay FM demodulator with filtered noise dither Digital delay FM demodulator with filtered noise dither

1987-08-12

1988-09-20

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329126, 329137, 329145, 331 78, H03D 306, H03K 906

Patent

active

047728531

ABSTRACT:
Audio beat notes produced by sampling a square wave in a digital quadrature FM demodulator are reduced by adding filtered random noise, or dither, to the signal to be demodulated to randomly vary the width of successive pulses in the square wave. Filtration of the random noise prevents feedthrough of noise which would degrade the demodulated signal.

REFERENCES:
patent: 3479457 (1969-11-01), Oswald
patent: 3778727 (1973-12-01), Williams
patent: 4368434 (1983-01-01), Miller et al.
patent: 4408352 (1983-10-01), Dudding
patent: 4553102 (1985-11-01), Yoshida
patent: 4577333 (1986-03-01), Lewis et al.
patent: 4635298 (1987-01-01), Kage et al.
"Digital Circuit Detects Frequency-Modulated Signals", Electronic Design, Apr. 12, 1976, p. 126.

Affiliated with

Also associated with

Rating

Digital delay FM demodulator with filtered noise dither does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital delay FM demodulator with filtered noise dither, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital delay FM demodulator with filtered noise dither will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1750712