Demodulators – Frequency modulation demodulator – Plural demodulation
Patent
1995-06-07
1996-08-20
Mis, David
Demodulators
Frequency modulation demodulator
Plural demodulation
329317, 329325, 329327, 329357, 329360, 329363, 455142, 455203, 455208, 455214, 455263, 455337, H03D 300, H03D 500, H03D 100
Patent
active
055482430
ABSTRACT:
A demodulator receives a radio signal and causes a carrier signal reproducing circuit to reproduce the carrier signal of the received signal. One amplifier amplifies the amplitude of the reproduced carrier signal by K, and another amplifies the amplitude of the reproduced carrier signal by (K+2). An adder adds the reproduced carrier signal, amplified by K, and the received signal. A subtracter subtracts the received signal from the reproduced carrier signal amplified by (K+2). The output signal of the adder is demodulated by a first FM demodulator and the output signal of the subtracter is demodulated by a second FM demodulator. Another subtracter outputs the difference between the demodulated signals from the first and second FM demodulators as a demodulated signal of the received signal.
REFERENCES:
patent: 3873931 (1975-03-01), Basse et al.
patent: 4466128 (1984-08-01), Couvillon
patent: 4837853 (1989-06-01), Heck
patent: 5034695 (1991-07-01), Owen
patent: 5408196 (1995-04-01), Sempel et al.
Kajimoto Shigeki
Sun Weimin
Icom Incorporated
Mis David
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