Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1980-04-10
1983-03-22
Olms, Douglas W.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329135, H04H 500
Patent
active
043777252
ABSTRACT:
A receiver (12) including an asynchronous demodulator (28) for recovering program signals from a composite modulated signal (46) including in-phase (48) and quadrature-phase (50) components. A phase detector (52) provides a signal corresponding to the phase of the composite modulated signal, while an envelope detector (54) provides a signal corresponding to the envelope of the composite modulated signal. The quadrature-phase component is demodulated by multiplying the phase and envelope signals together in an analog multiplier (56). In one embodiment, this demodulated signal is distortion-corrected by combining it with a distortion correction signal. Circuitry (66, 68, 69) is also provided for using the envelope and phase signals to asynchronously demodulate the in-phase component of the composite modulated signal. A signal processing circuit (70) recovers the program signals from the in-phase and quadrature-phase modulating signals.
REFERENCES:
patent: 3068475 (1962-12-01), Avins
patent: 3089096 (1963-05-01), Moore
patent: 3218393 (1965-11-01), Kahn
patent: 4079204 (1978-03-01), Takahashi et al.
patent: 4172966 (1979-10-01), Parker et al.
patent: 4184046 (1980-01-01), Parker
patent: 4185171 (1980-01-01), Parker
Harris Corporation
Olms Douglas W.
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