Circuit for demodulating amplitude and angle modulated broadcast

Details Circuit for demodulating amplitude and angle modulated broadcast Circuit for demodulating amplitude and angle modulated broadcast

1980-06-13

1982-07-20

Olms, Douglas W.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329135, 455212, H04H 500

Patent

active

043407820

ABSTRACT:
A superheterodyne receiver is described for demodulating signals containing both amplitude and angle modulation components. An intermediate frequency signal is produced which is simultaneously amplitude detected as well as angle demodulated. Detector means are provided for detecting the occurrence of high negative amplitude modulation peaks of the broadcast signal. During high negative amplitude modulation peaks, the angle demodulator output is held at a fixed level until the amplitude of an input signal is restored to a predetermined minimum level.

REFERENCES:
patent: 3457512 (1969-07-01), Deman
patent: 4144500 (1979-03-01), Tokunaga
patent: 4159396 (1979-06-01), Hilbert et al.
patent: 4195203 (1980-03-01), Sakai et al.

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