Descrambler apparatus

Details Descrambler apparatus Descrambler apparatus

1983-12-13

1986-09-30

Buczinski, Stephen C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358122, H04N 7167

Patent

active

046149708

ABSTRACT:
A descrambler apparatus for use with a video transmitter which transmits scrambled video transmission without detectable horizontal or vertical synchronizing pulses but with a descramble signal which occurs at a random time in each frame and which is coded with information indicating the length of time that the signal precedes a fixed preselected point in the transmitted frames. The descrambler apparatus detects the coding of each descramble signal and, after a length of time corresponding to the coding, generates a full frame sequence of horizontal and vertical sync pulses starting at the preselected point in a frame. The generated sync pulses are combined with the received video signals to produce a properly synchronized video signal.

REFERENCES:
patent: 4222068 (1980-09-01), Thompson
patent: 4319273 (1982-03-01), Nossem
patent: 4333107 (1982-06-01), McGuire et al.
patent: 4390898 (1983-06-01), Bond et al.
patent: 4511919 (1985-04-01), Forgey et al.

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