Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1989-06-05
1990-07-31
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329358, 329363, 358 25, 455312, 455337, H03D 122, H04N 562
Patent
active
049453130
ABSTRACT:
In a synchronous demodulator for demodulating a carrier signal modulated with a useful signal, the demodulator including a filter circuit (2) for selecting the carrier signal, a limiter (3) for generating an amplitude-limited reference signal from the carrier signal, a phase shifter (4) for shifting the phase of the reference signal through a phase angle of essentially 90.degree. with respect to the carrier signal, and a multiplier (5) for multiplicatively combining the modulated carrier signal with the phase shifted reference signal, a simple arrangement effectively suppresses interference phase modulations, in that a dc mixing product is supplied (via 8) by the multiplier (5) as a measure of the frequency deviation of the carrier signal from the pass frequency of the filter circuit (2) as a control signal to this filter circuit for the purpose of controlling the pass frequency.
REFERENCES:
patent: 4079330 (1978-03-01), Ishigaki et al.
patent: 4163196 (1979-07-01), Hongu et al.
patent: 4307347 (1981-12-01), Thomson
Brilka Joachim C.
Weltersbach Wolfgang
Goodman Edward W.
Grimm Siegfried H.
U.S. Philips Corporation
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