Video signal processing circuit

Details Video signal processing circuit Video signal processing circuit

H - Electricity

04

N

350/53

H04N 5/265 (2006.01) H04N 5/262 (2006.01)

Patent

CA 1129543

ABSTRACT A video signal processing circuit for producing a dissolve signal to control dissolving of a video signal uses primarily digital circuitry to derive the dissolve signal. A phase locked loop is used to produce a clock signal having a frequency which is a multiple of the vertical synchronizing signal in the video signal, this output frequency is frequency divided by a fraction determined by a programmable counter which defines the rate of dissolve, is processed by a signal processor and delivered to an up/down counter controlling a digital to analogue converter, the output of which is processed to produce as said control signal a ramp signal of which the slope is determined by the programmable counter.

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