Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1986-10-20
1988-07-19
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358160, 307263, 307265, 307268, 328164, H04N 514
Patent
active
047588918
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
Hitchcock James E.
Skinner Kenneth R.
Briody Thomas A.
Groody James J.
North American Philips Consumer Electronics Corp.
Parker Michael D.
Rich Marianne R.
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