Multiplex communications – Communication techniques for information carried in plural... – Transmission bandwidth conservation
Patent
1996-07-17
1999-12-21
Nguyen, Chau
Multiplex communications
Communication techniques for information carried in plural...
Transmission bandwidth conservation
370509, 370516, 370521, H04J 318, H04J 306
Patent
active
060058722
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.
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Bassi Thierry
Rambault Claude
Burke Alexander J.
Hyun Soon-Dong
Nguyen Chau
Thomson Multimedia S.A.
Tripoli Joseph S.
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