Circuit for recovering the carrier of an amplitude modulated syn

Details Circuit for recovering the carrier of an amplitude modulated syn Circuit for recovering the carrier of an amplitude modulated syn

1979-03-09

1981-02-24

Pitts, Harold I.

Pulse or digital communications

Spread spectrum

Direct sequence

375 96, H04L 2722

Patent

active

042531896

ABSTRACT:
The present invention comes within the field of synchronous digital transmission. It relates to the recovering the carrier (which may be suppressed carrier) of an amplitude modulated synchronous digital signal. It provides a circuit which includes an oscillator (41) of adjustable frequency and phase to generate a local carrier, a demodulation circuit whose input(s) receives the local carrier (possibly phase shifted by .+-..PSI. (42,44,46,47) and the amplitude modulated synchronous digital signal e(t) and control means (48,49) which control the phase and the frequency of the oscillator from the signals delivered by the demodulation circuit and which comprise at least one sign coincidence autocorrelator. It advantageously applies to demodulating amplitude modulated single side band bipolar coded synchronous digital signals.

REFERENCES:
patent: 3806815 (1974-04-01), Fletcher
patent: 3860871 (1975-01-01), Hinoshita
patent: 3891927 (1975-06-01), Filaferro
patent: 3919653 (1975-11-01), Le Mouel
patent: 3944938 (1976-03-01), Brouant
patent: 3984778 (1976-10-01), Bhopale
patent: 4100499 (1978-07-01), Monrolin
W. F. Lawrence, "On the Use of . . . Demodulation," IEEE Trans. on Comm., Jan. 1976, pp. 46, 47.

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