Control circuit of the phase of a local oscillator for the receiver of signals of the data transmitted by an amplitude modulation as a single band lateral

摘要

The invention relates to the transmissions] and more particularly to the recovery, in the reception of the carrier is not necessarily emise of a data signal transmitted by an amplitude modulation. / p & & p & it relates to a servo-control circuit comprising at least a multiplier signs carrying out the product of the polarity of a local carrier affected of a phase delay of p4 and that of the signal data is demodulate, followed by a autocorrelator a coincidence of the sign for controlling the phase of an oscillator generating the local carrier, and performs the comparison between two versions of the signal issued by the comparator of signs, the two versions as lagged with respect to each other by an odd multiple of a quarter of a period of the carrier used in the transmission for carrying out the amplitude modulation. / p & & p & it is advantageously applied at the demodulation of a signal of clinical code, shaped according to the technique called partial response class 4, and transmitted by amplitude modulation of a single band lateral.