Recovery of carrier and clock frequencies in a phase or...

Details Recovery of carrier and clock frequencies in a phase or... Recovery of carrier and clock frequencies in a phase or...

H - Electricity

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L

325/28

H04L 27/18 (2006.01) H04L 27/06 (2006.01) H04L 27/20 (2006.01) H04L 27/227 (2006.01) H04L 27/38 (2006.01)

Patent

CA 1220526

ABSTRACT OF THE DISCLOSURE 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.

451553

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