Sync extraction for a broadcasting system with time multiplexing

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

1985-05-31

1987-11-17

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358153, 375 98, 375111, 455237, 455246, H04N 1106

Patent

active

047077301

ABSTRACT:
In a broadcasting system with time division multiplexing of digital signals containing a synchronization 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 amplified signal a DC component which is a decreasing function of the sum of the extreme values, until the retrieval of the clock signal and identification of the synchronization pattern downstream of the coding.

REFERENCES:
patent: 3409834 (1968-11-01), Cullis et al.
patent: 3851266 (1974-11-01), Conway
patent: 3914536 (1975-10-01), Mohri et al.
patent: 4360929 (1982-11-01), Isobe
patent: 4517586 (1985-05-01), Balaban et al.
patent: 4540974 (1985-09-01), Schanne et al.
patent: 4602374 (1986-07-01), Nakamura et al.
"Multiple Sound Channels in Satellite Broadcasting"; Windram; IEEE Proceedings, vol. 129, PEA, #7, Sep. 1982, pp. 528-531.

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