Apparatus for digitally controlling the D.C. value of a processe

Details Apparatus for digitally controlling the D.C. value of a processe Apparatus for digitally controlling the D.C. value of a processe

1989-04-12

1990-10-23

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358168, 358183, H04N 518

Patent

active

049656694

ABSTRACT:
A digital D.C. control system includes a multiplexer, a digital-to-analog converter, a capacitor, offset generating circuitry and clamping circuitry. A digital signal to be D.C. controlled and a digital brightness control signal are alternatively coupled by the multiplexer to the input of the digital-to-analog converter. The output from the digital-to-analog converter is coupled to a system output terminal via the capacitor. When the signal is applied to the digital-to-analog converter a fixed D.C. offset is applied to the interconnection of the converter and capacitor. During preselected intervals the D.C. control value is coupled to the digital-to-analog converter concurrently with the system output terminal being clamped to a fixed reference and the D.C. offset circuitry being disabled. This combination of apparatus permits controlling the D.C. level of a digitally processed signal without affecting the dynamic range of the digital signal.

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