Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1979-03-09
1980-07-22
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
343 5DP, 343 5SC, H04N 502
Patent
active
042142695
ABSTRACT:
A digital scan converter is disclosed for processing the sequence of analog signals supplied by a sector scanning surveillance system to form a signal compatible with television type display devices. The signals supplied by the surveillance system are digitized by an analog-to-digital converter at a rate proportional to the cosine of the azimuthal scan angle that is associated with each analog signal to thereby effect a first portion of the required conversion from the polar coordinate format of the surveillance system to the Cartesian coordinate format of the television display. The digitized signals are stored in a memory so as to permit addressing of a set of stored data that corresponds to one horizontal trace of the television display. The data sets corresponding to successive horizontal lines of the television display are sequentially accessed in accordance with conventional television timing signals and data is serially read from memory and supplied to a digital-to-analog converter at a rate that completes the required polar-to-Cartesian format conversion.
REFERENCES:
patent: 3765018 (1973-10-01), Heard
patent: 3810174 (1974-05-01), Heard
patent: 4002827 (1977-01-01), Nevin
patent: 4065770 (1977-12-01), Berry
patent: 4099179 (1978-07-01), Hofstein
patent: 4149252 (1979-04-01), Miller
patent: 4167753 (1979-09-01), Lynk
Behlen, Jr. James C.
Parker Edward J.
Advanced Technology Laboratories, Inc.
Britton Howard W.
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