Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1988-04-06
1989-07-11
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358166, H04N 964, H04N 514
Patent
active
048476811
ABSTRACT:
In a television system a transition level signal booster decreases transition time of low level transitions within a video signal without creating artifacts incident to high level transitions within the video signal. The booster includes an input for receiving the video signal, an output for putting out a main path video signal in which transition times of low level transitions have been decreased, a main path for the video signal extending between the input and the output, the main path including a main path adder means for adding a transition boost signal to the video signal, a transition boost signal generator including a connection to said input for receiving the video and for generating the transition boost signal, the generator comprising: a high frequency transition signal generator for generatigng a high frequency transition signal incident to the detection of a transition level in the video signal, a wave shaper including a first path having a delay match in series therein for putting out a first signal and a second path in parallel with the first path, the second path including sign removal and shaper means therein for generating a second control signal having a decreasing amplitude for each video transition having a magnitude above a predetermined amount, a first multiplier for multiplying the first signal by the second signal to generate the transition boost signal, said multiplier being connected to said main path adder means so that said transition boost signal may be added to the main path video signal, thereby to decrease the transition times of low transition levels.
REFERENCES:
patent: 4030121 (1977-06-01), Faroudja
patent: 4262304 (1981-04-01), Faroudja
patent: 4263616 (1981-04-01), Lee
patent: 4414564 (1983-11-01), Hitchcock
patent: 4509080 (1985-04-01), Lagoni
patent: 4731660 (1988-03-01), Faroudja et al.
Campbell Jack J.
Faroudja Yves C.
Faroudja Yves C.
Harrison David B.
Shepperd John W.
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