Digital wipe generator

Details Digital wipe generator Digital wipe generator

1988-02-19

1989-02-14

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358182, H04N 5272

Patent

active

048050229

ABSTRACT:
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.

REFERENCES:
patent: Re29600 (1978-03-01), Tkacenko
patent: 3371160 (1968-02-01), Hurford
patent: 3944731 (1976-03-01), Busch
patent: 3962536 (1976-06-01), Busch
patent: 4041527 (1977-08-01), Rayner et al.
patent: 4121253 (1978-10-01), McCoy
patent: 4319266 (1982-03-01), Bannister
patent: 4395733 (1983-07-01), Elenbaas
patent: 4520398 (1985-05-01), Takahashi
patent: 4694343 (1987-09-01), Flora

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