Television – Image signal processing circuitry specific to television – Dc insertion
Reexamination Certificate
2005-10-06
2008-12-23
Yenke, Brian P (Department: 2622)
Television
Image signal processing circuitry specific to television
Dc insertion
C348S677000, C348S689000, C341S144000, C341S118000
Reexamination Certificate
active
07468760
ABSTRACT:
A level clamping control circuit and associated level clamping control method are provided. The level clamping control circuit includes a reference level estimator, a subtractor, a clamping computation circuit, a dithering circuit, and a digital-to-analog converter (DAC). The reference level estimator estimates a reference level of the input signal. The subtractor computes a difference between the reference level and a desired reference level to output a difference signal. The clamping computation circuit generates a first control value according to the difference signal. The dithering circuit dithers the first control value to alternately output a plurality of second control values. Finally, the DAC respectively utilizes the second control values to charge or discharge a capacitor to adjust the reference level of the input signal.
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Huang Ke-Chiang
Kao Ta-Chan
Smith Sterling
Hsu Winston
MStar Semiconductor Inc.
Yenke Brian P
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