Television – Image signal processing circuitry specific to television – A/d converters
Patent
1992-10-14
1999-08-17
Harvey, David E.
Television
Image signal processing circuitry specific to television
A/d converters
341131, H04N 724
Patent
active
059401389
ABSTRACT:
The present invention provides distortion compensating of an analog signal which is quantized by an A/D converter. A dither device processes a clock signal from a clock signal generator to provide an output signal with a known dither pattern. The output signal with the dither pattern has a plurality of different frequencies that are periodically repeated. In addition, the same frequency of respective cycles of the dither pattern has different phases. The dither signal is superimposed on the analog signal, thus, distortion of the analog signal is compensated or reduced subsequent to A/D conversion. In particular, this dithered analog signal may be converted into a digital signal in response to the clock signal which is used to generate the dither so that the digital signal approximates to the analog signal much more closely than if the equivalent digital signal were obtained by conventional analog to digital conversion.
REFERENCES:
patent: 3244808 (1966-04-01), Roberts
patent: 3656152 (1972-04-01), Gundersen
patent: 3877022 (1975-04-01), Lehman et al.
patent: 4183016 (1980-01-01), Sawagata
patent: 4447803 (1984-05-01), Crosby
patent: 4543599 (1985-09-01), Willis et al.
patent: 4827343 (1989-05-01), Naimpally
Roberts, Lawrence Gilman "Picture Coding Using Pseudo-Random Noise" IRE Transactions On Information Theory pp. 145-154 1962, Feb.
Thompson et al., "A Pseudo-Random Quantizer for Television Signals" Proceedings of the IEEE vol. 55, No. 3 Mar. 1967.
Cooper J. Carl
Cooper J. Carl
Harvey David E.
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