H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/90
H04N 5/04 (2006.01) H04N 7/083 (2006.01)
Patent
CA 1245349
ABSTRACT OF THE DISCLOSURE Sync extraction for a broadcasting system with time multiplexing of digital and analog signals In a broadcasting system with time division multiplexing of digital signals containing a synchronisation pattern and analog signals, sync extraction is achieved with a process including detecting the extreme values of the signals to be subjected to decoding, after they have been amplified with a gain G, with a time constant compatible with the low cut off frequencies to be accomodated; the gain G is controlled as a decreasing function of the difference between the extreme values with a time constant greater by several orders of size than the repetition period of the multiplex; before decoding and determination of the extreme values, there is added to the amplitied signal a DC component which is a decreasing function of the sum of the extreme values, until the retrieval of the clock signal then identification of the synchronisation pattern downstream of the coding.
482860
Etablissement Public de Diffusion Dit "telediffusion de France"
Etat Francais Represente Par Le Secretaire D'etat Aux Postes Et
Goudreau Gage Dubuc
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