Coded data generation or conversion – Analog to or from digital conversion – Increasing converter resolution
Patent
1993-08-06
1996-06-11
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
Increasing converter resolution
348574, H03M 120
Patent
active
055259847
ABSTRACT:
When processing video television information the low frequency band is inherently of primary interest due to the natural averaging properties of the human eye, combined with the limited frequency response of video display elements such as phosphorus and liquid crystal displays. Noise is generated and observed in the low frequency region of digitized analog video signals due to nonlinearities inherent in the digitization process. This invention reduces the noise measured in the low frequency region by shifting the noise upband and out of the frequencies of interest by adding a dither signal to the analog input signal and employing a 2X decimation digital filter to remove the unwanted dither and spurious intermodulation signals. The disclosed invention allows for a simple and inexpensive means for removal of the dither signal without having to resort to complex dither subtraction techniques employed in the prior art.
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Paper presented at 42nd Annual NCTA Convention and Exposition on Jun. 6-9, 1993 in San Francisco, California entitled Quantifying Video Performance in Uncompressed and Compressed Digital Systems used for Regionwide CATV Fiber Networks by John Holobinko, Vice President, Marketing and Strategic Planning and Norman Bunker, Director of Advanced Development.
Eisenson, Direct Digital Synthesis, Microwave Engineering Europe, Sep. 1990, pp. 33-49.
ADC Telecommunications Inc.
Williams Howard L.
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