Sync extraction for a broadcasting system with time...

Details Sync extraction for a broadcasting system with time... Sync extraction for a broadcasting system with time...

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.

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