Analog signal process with dither pattern

Details Analog signal process with dither pattern Analog signal process with dither pattern

1992-08-04

1998-11-10

Harvey, David E.

Television

Image signal processing circuitry specific to television

A/d converters

341131, H04N 724

Patent

active

058351582

ABSTRACT:
The present invention provides distortion compensating of an analog signal. A dither device processes a clock signal from a clock signal generator to provide an output signal with a 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 further superimposed on the analog signal. Thus, distortion of the composite analog signal is compensated. In particular, this dither analog signal may be converted into a digital signal in response to the clock signal so that the digital signal approximates to the analog signal much more than the digital signal obtained by conventional analog to digital converting.

REFERENCES:
patent: 3244808 (1966-04-01), Roberts
patent: 3656152 (1972-04-01), Gundersen
patent: 3877022 (1975-04-01), Lehmon et al.
patent: 3984624 (1976-10-01), Waggener
patent: 4183016 (1980-01-01), Sawagata
patent: 4447803 (1984-05-01), Crosby
patent: 4543599 (1985-09-01), Willis et al.
patent: 4651293 (1987-03-01), Kato
patent: 4827343 (1989-05-01), Naimpally
Roberts, Lawrence Gilmon "Picture Coding Using Pseudo-Random Noise" IRE Transactions On Information Theory pp. 145-154 Feb. 1962.
Thompson et al., "A Pseudo-Random Quantizer for Television Signals" Proceedings of the IEEE vol. 55 No. 3 Mar. 1967.

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