Digital wipe generator

Details Digital wipe generator Digital wipe generator

H - Electricity

04

N

350/53

H04N 5/268 (2006.01) H04N 5/265 (2006.01)

Patent

CA 1328921

-12- Abstract of the Disclosure A digital wipe generator has a digital waveform generator to generate x and Y digital waveforms from a composite sync signal. A digital wipe solid generator processes the X and Y digital waveforms to produce a digital wipe solid waveform. The wipe solid generator has a circle generator using a square root function which preshifts the sum of the squares prior to access to a look-up table, and then post shifts the output of the look-up table by one-half the amount of the preshift to produce a desired curve pattern for the digital wipe solid waveform. The digital wipe solid waveform is input to mixer circuits where it is processed to produce an anti-aliased key signal for mixing external video signals, the anti-aliasing being based upon an interpolation/decimation scheme using fractional bits of the digital wipe solid waveform. The output of the mixer circuits is a desired wipe transition.

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