Method and apparatus for improving the rise and fall time of a v

Details Method and apparatus for improving the rise and fall time of a v Method and apparatus for improving the rise and fall time of a v

1990-07-17

1993-02-09

Shepperd, John W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358162, H04N 514

Patent

active

RE0341762

ABSTRACT:
The edges of an incoming video signal are sharpened by switching the output furnishing the sharpened signal in sequence first to receive a signal delayed by a greater amount, i.e. a signal which has not as yet undergone transition, and, secondly, to receive a signal delayed by a lesser amount, i.e. one that has already completed the transition. The rise time of the affected edge thus depends only on the time required to switch from one terminal to the next. The same switching sequence is carried out regardless of whether the transition is a negative going or positive going transition.

REFERENCES:
patent: 3800077 (1974-03-01), Smith
patent: 3980813 (1976-09-01), Shinkai
patent: 4541014 (1985-09-01), Yagi

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