Method and apparatus for generating a video wipe border signal

Details Method and apparatus for generating a video wipe border signal Method and apparatus for generating a video wipe border signal

1987-11-03

1989-02-28

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358182, H04N 5272

Patent

active

048090727

ABSTRACT:
Horizontal and vertical wipe signals are additively modified to vary the boundary between an inserted picture to be faded in and the previously displayed picture to be faded out as part of the fading transition. The resulting modified wipe signals are compared with a zero voltage reference signal to determine intervals, respectively in horizontal and vertical scan, during which the substituted picture is to be switched in. The picture switching signal is also used to substitute, during that same interval, an inverted wipe signal instead of the non-inverted wipe signal. The composite wipe signal thus produced is then compared with a border width control voltage to produce horizontal and vertical border-defining pulses respectively centered on the flanks of the picture switching pulse. The horizontal and vertical border defining pulses are multiplicatively combined to produce the ultimate border defining pulse for inserting the border between the two picture contents. Centering of the border on the boundary between the picture contents is assured even when the border width is narrowed down to bare visibility.

REFERENCES:
patent: 4121253 (1978-10-01), McCoy
patent: 4646154 (1987-02-01), Shinohara
Kompakter Produktions-Mischer R . . . ME, Service Manual 4-20759-01-SD, Bosch, pp. 3/1, 3/55-3/66, Jul. 1983.
"Compact Production Switcher with Control Function Memory" Brochure Published by BTS, May 1987.
"RME Compact Production-Switcher PAL NTSC PAL-M" Brochure Published by Bosch, Apr. 1984.

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