Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1978-07-21
1979-12-11
Richardson, Robert L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
H04N 521, H04N 530
Patent
active
041786122
ABSTRACT:
A delta frame circuit is disclosed. The delta frame circuit is connected to the video output of, for example, an imaging system for the purpose of producing a moving target indication radar or, for example, a chopped imaging system for the purpose of removing fixed pattern or undesirable offset voltages. The delta frame circuit comprises a plurality of capacitors having top plates connected to the video output and lower plates connected to the drains of a first plurality of field effect transistors. The gates and sources of these field effect transistors are connected, respectively, to a Y address circuit and drains of a second plurality of field effect transistors. The gates and sources of these field effect transistors are connected, respectively, to a X address circuit and to the drains of a third plurality of field effect transistors whose gates and sources are connected, respectively, to the Y address circuit, and junction of a precharge reference voltage and output amplifier. The X and Y address circuits address the capacitors which store the video output of a field pixel by pixel for comparison to a reference voltage and a second video field whereby the offset signals are substantially removed.
REFERENCES:
patent: 3946151 (1976-03-01), Kamiyama et al.
patent: 4058836 (1977-11-01), Drewery
patent: 4107736 (1978-08-01), Lowry et al.
Dudley Dana
Knight, Jr. William M.
Bandy Alva H.
Comfort James T.
Grossman Rene
Richardson Robert L.
Texas Instruments Incorporated
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