Apparatus for digitally controlling the d.c. value of a...

Details Apparatus for digitally controlling the d.c. value of a... Apparatus for digitally controlling the d.c. value of a...

H - Electricity

03

M

354/98

H03M 1/66 (2006.01) H04N 5/18 (2006.01) H04N 5/45 (2006.01) H04N 5/57 (2006.01)

Patent

CA 2013342

RCA 85,498 Abstract of the Disclosure 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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