Method and device for synchronizing digital decoder and encoder clocks

Abstract

The disclosure relates to a method of synchronization of clocks wherein, in a system including a digital decoder of a receiver equipped with a sampling clock and a digital encoder of an transmitter also equipped with a sampling clock, said method includes the following stages: in the transmitter, coding by packets of samples of a signal by time intervals of predetermined duration and triggering of the transmission of a data frame when a packet of data is ready to be sent; in the receiver, detection of start of said frame, and generation of a reference signal following said detection, said reference signal being used to correct the clock of the receiver. Another object of the invention is a method of synchronization of clocks wherein, in a system including a digital decoder of a receiver equipped with a sampling clock and a digital encoder of a transmitter also equipped with a sampling clock, in which the transmitter sends frames containing data packets corresponding to a number known of samples, said method includes the following stages in the receiver: reception of a data frame including a packet of data, decoding of said packet and writing of the decoded data in a memory, reading of said decoded data in said memory at a frequency that is a function of the frequency of said clock of the decoder, comparison at a predetermined time of the occupancy of said memory with respect to a threshold, and correction of said clock of the decoder according to the result of said comparison. The invention is applicable in the field of digital transmission, notably transmissions between digital visiophones.