Television – Image signal processing circuitry specific to television – A/d converters
Reexamination Certificate
2008-01-29
2008-01-29
Tran, Trang U. (Department: 2622)
Television
Image signal processing circuitry specific to television
A/d converters
C348S677000, C348S678000, C348S691000
Reexamination Certificate
active
10964550
ABSTRACT:
A video decoder in which 1) resolution quality can be improved for a given bit count analog-to-digital converter, 2) a lower bit count analog-to-digital converter can be used with substantially similar quality or 3) a combination of improved resolution quality with a lower bit count analog-to-digital converter can be done. In the preferred embodiment, a DC bias is added to the video signal after the sync portion of the composite signal has been received and prior to the active video being received. This bias is then removed after the end of the active video period. By applying this bias, the DC voltage level of the video signals is actually reduced, so that the full scale value of the analog-to-digital conversion process can also be reduced. Thus, compared to using an unbiased signal, increased A/D converter resolution is obtained. In an alternative embodiment, the sync portion can be biased upwardly during the front porch and then be returned during the back porch.
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Gudmondson Daniel
Somayajula Shyam
Cirrus Logic Inc.
Tran Trang U.
Wong Cabello Lutsch Rutherford & Brucculeri LLP
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