Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-09-24
1992-08-25
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 22, H04N 5272
Patent
active
051423685
ABSTRACT:
In the generation of a digital special effect boundary signal for mixing or fading television signals with a wipe movement, the boundary position is determined by the state of a counter controlled by a clock pulse oscillator coupled to the line frequency. In order to prevent a visible staircase effect on the moving boundary, a progressive phase shifting of the clock signal for clocking the counter is provided by a control signal derived from the digital data of the special effect boundary signal. For that purpose a variable delay line is interposed ahead of the clock input of the counter and the delay is controlled, line by line, by a digital ramp signal processed in a multiplier and other stages. The counter is loaded with data supplied during the horizontal blanking interval from another output of the digital multiplier.
REFERENCES:
patent: 4199788 (1980-04-01), Tsujimura
patent: 4287534 (1981-09-01), Pohl
patent: 4356511 (1982-10-01), Tsujimura
patent: 4782391 (1988-11-01), McMeely et al.
patent: 4833538 (1989-05-01), Heida
patent: 4860630 (1989-07-01), Field
Britton Howard W.
BTS Broadcast Television Systems GmbH
Murrell Jeffrey S.
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