Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1986-04-30
1987-10-20
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358152, 358166, 358167, H04N 502, H04N 504, H04N 521
Patent
active
047017937
ABSTRACT:
The field rate of a video input signal is doubled by storing each field in a memory and recovering each stored fields twice so as to repeat each field and thus reduce flicker. To ensure that even fields overlay even fields, odd fields overly odd fields and that all pairs of even and odd fields are interlaced, a timing unit provides a double field rate control signal to the memory having a waveform that repeats on a two-field basis and supplies a double field rate vertical synchronizing signal to a display having a waveform that repeats on a four-field basis. Registration of images is enhanced further by means of a vertical scan generator having a constant retrace time, a fixed retrace level and employing DC coupling thereby avoiding raster shift which otherwise could occur as a result of the use of non-equidistant vertical synchronizing pulses.
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den Hollander Willem
Leonardi Giovanni M.
Coalter Richard G.
Emanuel Peter M.
Groody James J.
Kostak Victor R.
Rasmussen Paul J.
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