Video signal clamping circuit
OwnerKeiichi Tsumura, Shinji Yamamotoinventors
Life of this patent
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Abstract
A filter performs a filtering process by sampling a digital video signal only for an OB period. A first subtracter subtracts an OB data target value from the output value of the filter. A second subtracter sets a subtraction amount based on the subtracted result of the first subtracter and subtracts the subtraction amount from the digital video signal. A digital analog converter converts the subtracted result of the first subtracter to an analog signal and outputs it to an analog clamper. The analog clamper performs a subtracting process to an analog video signal based on the output value of the digital analog converter.
Claims15
A video signal for clamping circuit comprising:
- an analog clamper for performing a subtracting process to an analog video signal;
- an analog digital converter for converting the analog video signal outputted from the analog clamper to a digital video signal;
- a filter for performing a filtering process by sampling the digital video signal outputted from the analog digital converter only for an OB period;
- a first subtracter for subtracting an OB data target value from the output value of the filter;
- a second subtracter for setting a subtraction amount based on the subtracted result of the first subtracter, and subtracting the subtraction amount from the digital video signal outputted from the analog digital converter;
- and
- a digital analog converter for converting the subtracted result of the first subtracter to an analog signal and outputting it to the analog clamper, wherein
- the analog clamper performs the subtracting process based on the output value of the digital analog converter.
A video signal clamping circuit comprising:
- an analog clamper for performing an analog clamping process;
- and
- a digital clamper for performing a digital clamping process, wherein
- an intermediate result in the digital clamper is fed back to the analog clamper, and
- the analog clamper performs a clamping process based on the fed-back value from the digital clamper.
Dependencies are inferred from the claim text.