Last line velocity compensation

Details Last line velocity compensation Last line velocity compensation

1975-03-03

1976-11-23

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

360 26, 360 36, H04N 5795

Patent

active

039940136

ABSTRACT:
In last line velocity compensation of color television signals reproduced by video recorders, the velocity error signal for the next to last line of information before the head switch that occurs during the vertical blanking interval is stored for a time extending beyond the period of the last line. The switching between transducers that occurs during each vertical blanking interval is delayed so that a color burst signal following the last line is reproduced and a velocity error for the last line generated. This last line velocity error signal is differentially compared with the stored next to last line velocity error to provide a velocity error difference signal. The error difference signal is stored for the period between the foregoing and succeeding vertical blanking intervals. The stored velocity error difference signal is added to the velocity error of each of the next to last lines of video information reproduced before switching between transducers at times between such vertical blanking intervals to provide last line velocity error compensation for those intervening last line.

REFERENCES:
patent: 3428745 (1969-02-01), Coleman
patent: 3659040 (1972-04-01), Fujita
patent: 3716663 (1973-02-01), Bolger
patent: 3717721 (1973-02-01), Makara et al.

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