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 inc.sub.h to 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 inc.sub.sc to the color discrete time
oscillator to maintain lock to the color burst. The horizontal phase
locked loop adjusts inc.sub.h that varies about nominal increment
(nom_inc.sub.h) by .DELTA.h. The feed forward error correction for the
adjustment to the color discrete time oscillator is the nomimal increment
(nom_inc.sub.sc) and a feed forwarded scaled version of .DELTA.h.
