Digital FM demodulator signal-to-noise improvement

Details Digital FM demodulator signal-to-noise improvement Digital FM demodulator signal-to-noise improvement

1987-08-11

1989-06-13

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

048396060

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

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.

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