Feed forward error correction in video decoder

Details Feed forward error correction in video decoder Feed forward error correction in video decoder

2005-01-04

2005-01-04

Yenke, Brian P. (Department: 2614)

Television

Synchronization

Phase locking regenerated subcarrier to color burst

C348S507000, C348S536000, C348S540000, C375S376000, C331S020000, C327S154000

Reexamination Certificate

active

06839092

ABSTRACT:
In accordance with an embodiment of the present invention a microprocessor in the horizontal phased lock loop reads the horizontal timing with respect to the sync input and provides an increment inchto the horizontal discrete time oscillator to make corrections in its timing to maintain lock to the sync input. The horizontal discrete time oscillator output is used to produce a pixel clock which drives the color discrete time oscillator in a color phased locked loop. A microprocessor reads a phase error between the color burst input and the color local oscillator frequency and writes an increment incscto the color discrete time oscillator to maintain lock to the color burst. The horizontal phase locked loop adjusts inchthat varies about nominal increment (nom_inch) by Δh. The feed forward error correction for the adjustment to the color discrete time oscillator is the nomimal increment (nom_incsc) and a feed forwarded scaled version of Δh.

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