Chrominance overload control system

Details Chrominance overload control system Chrominance overload control system

H - Electricity

04

N

350/62

H04N 9/68 (2006.01)

Patent

CA 1230674

Abstract A system for controlling overload of a chrominance component processor output includes means for comparing the processor output signal magnitude with a predetermined maximum desired magnitude value. Occurrences of the processor output signal magnitude exceeding the predetermined magnitude are identified as overload occurrences only if the duration of the excess continues for an interval of a width determined by the noise content of the processor output signal. An overload control value is produced, corresponding to the average value of the processor output signal magnitudes over each such interval. Means are provided for detecting the number of separate times within a given time period (e.g., field or frame interval) that an overload control value is produced. Additional means, responsive to the overload control values and to the detected number, develop an overload control signal which is substantially representative of the average of the respective overload control values developed during one of said given time periods. Scaling of the overload control signal is effected in accordance with the output of the number detecting means.

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