Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1980-09-16
1982-09-14
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
331 12, 331 17, 331 23, 331 25, 455202, 455260, H03D 100, H03L 708
Patent
active
043497853
ABSTRACT:
A feedback circuit for controlling the phase of a local oscillator provided with frequency adjusting means and delivering a local carrier wave for demodulating a data signal transmitted by single side band amplitude modulation, the said feedback circuit comprising at least one sign multiplier (21) producing the product of the sign of the local demodulation carrier shifted by a phase difference of .pi./4 multiplied by the sign of the data signal to be demodulated, followed by a sign coincidence auto-correlator (22) which controls the said frequency adjusting means and correlates two versions of the signal delivered by the sign multiplier (21), one of the two versions being delayed relative to the other by an odd multiple of one fourth of the period of the carrier used for the amplitude modulation on transmission.
REFERENCES:
patent: 3669511 (1972-06-01), Motley et al.
patent: 3675131 (1972-07-01), Pickholtz
patent: 4091410 (1978-05-01), Citta
patent: 4253189 (1981-02-01), Lemoussu et al.
Cardot Claude
Lemoussu Michel
Compagnie Industrielle des Telecommunications Cit-Alcatel
Grimm Siegfried H.
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