Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1986-08-04
1987-10-06
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329136, 329139, 329168, 358 36, 358167, 455266, 455307, H03D 300, H04B 110
Patent
active
046985980
ABSTRACT:
A FM demodulator system which provides threshold extension by frequency selective phase modulation of the input FM signal in a band pass filter to reduce phase error between the input and output of the filter. The output of the filter is applied to an FM discriminator which provides a base band signal. This base band signal is applied to a frequency selective phase compensation network to derive a signal which phase modulates the band pass filter. The filter rejects uncorrelated thermal noise so as to effect threshold extension in the demodulator system.
REFERENCES:
patent: 4101837 (1978-07-01), Clayton, Jr. et al.
patent: 4339828 (1982-07-01), Chasek
patent: 4458207 (1984-07-01), Favrean et al.
patent: 4563651 (1986-01-01), Ohta et al.
patent: 4594556 (1986-06-01), Ohta
Ref. Data Radio Eng. 5th Ed., pp. 21-12 & 13, 1985.
Mobley Joseph G.
Womble David P.
Grimm Siegfried H.
Lukacher Martin
Scientific - Atlanta, Inc.
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