Apparatus system for deriving synchronizing information from a d

Details Apparatus system for deriving synchronizing information from a d Apparatus system for deriving synchronizing information from a d

1990-02-08

1991-04-16

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358150, H04N 504

Patent

active

050087517

ABSTRACT:
Synchronizing information is obtained from a digital video signal by supplying the digital video signal to a first digital function genenator which recognizes that the beginning and end of the horizontal blanking interval the preamble of a timing reference signal that precedes the synchronizing word that concludes the timing reference signal. This function generator is clocked at the data word rate of the digital video signal. If the preamble is correctly received the function generator provides at its output register the synchronizing information provided in the corresponding bits of the synchronizing word, and also a signal designating that a valid synchronizing word has just been received. A programmable logic circuit converts this synchronizing information into synchronizing signals and also provides by means of two-bit counter sub-multiple clock signals. The derived synchronizing signals include horizontal and vertical blanking pulses, a field designating signal and a signal that designates whether the video signal is of the 625 line standard of the 525 line standard.

REFERENCES:
patent: 4887279 (1989-12-01), Odenheimer
CCIR Recommendation 656 "Interfaces for Digital Component Video Singals in 525-Line and 625-Line Televison Systems" (1986).

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