Analog-to-digital conversion system as for a narrow bandwidth si

Details Analog-to-digital conversion system as for a narrow bandwidth si Analog-to-digital conversion system as for a narrow bandwidth si

1984-12-03

1987-03-03

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 13, 340347CC, 340347AD, H04N 704

Patent

active

046479686

ABSTRACT:
A narrow bandwidth analog-to-digital conversion (ADC) system is described in the context of the color burst processing and burst phase detecting circuitry of a digital color television receiver. The ADC includes a dither generator which adds a dither signal to either the analog input signal or to the reference signal used by the ADC. This dither signal increases in magnitude by 1/16 of an LSB value at a rate one-quarter of the burst frequency and changes in sign at one-half of the burst frequency. This signal passes through a low-pass filter in the chrominance channel providing an increase in sample resolution by averaging the samples in a chroma band-pass filter and in the phase detecting circuitry.

REFERENCES:
patent: 4393372 (1983-07-01), Hoehn
patent: 4496935 (1985-01-01), Inoue et al.
patent: 4535257 (1985-08-01), Hareyama
patent: 4547763 (1985-10-01), Flamm
patent: 4566028 (1986-01-01), Lewis, Jr. et al.

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