Recovery of carrier and clock frequencies in a phase or amplitud

Pulse or digital communications – Repeaters – Testing

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Details

375 52, 375 81, 329112, H03C 500

Patent

active

045920710

ABSTRACT:
This invention aims at making a carrier wave synchronous with a clock signal provided with a digital signal in a modem transmitting part and at recovering a carrier wave having a phase coherent with the clock signal in a modem receiving part. The demodulated binary signal in the receiving part offers a reduced error rate since known transcoding operations in the transmitting and receiving parts are done away with. Noise immunity is also improved. The invention provides, in the receiving part receiving a modulation signal obtained by phase or amplitude state modulation in the transmitting part, a circuit for delaying the received signal by a delay equal to half a modulation period, a circuit for summing the received and delayed signals, a circuit for full-wave rectifying the summation signal, and a phase locked loop mainly including a sampling circuit, a phase comparator and a voltage controlled oscillator for recovering the carrier wave and the clock signal.

REFERENCES:
patent: 3470477 (1969-09-01), Battail et al.
patent: 3828138 (1974-08-01), Fletcher et al.
patent: 3919651 (1975-11-01), Le Mouel
patent: 4275465 (1981-06-01), Lemoussu
patent: 4328587 (1982-05-01), Mizuno et al.
patent: 4466108 (1984-08-01), Rhodes

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