Digital chrominance processor with a phase and frequency control

Details Digital chrominance processor with a phase and frequency control Digital chrominance processor with a phase and frequency control

1986-03-04

1987-07-21

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 13, 358 23, H04N 945

Patent

active

046822097

ABSTRACT:
In a digital chrominance signal processing circuit for a chrominance signal which is sampled at a frequency equal to a number of times the chrominance subcarrier frequency, this frequency can be made variable, without switching to a different crystal frequency, by using a clock signal produced by a crystal oscillator (65) and a digital oscillator (71) which is controlled via a digital number (at 73) and whose quiescent frequency can be changed by changing a number to be applied to an input (95) of an adder circuit (85). Additionally, the adder circuit (85) is supplied with a number representing a control signal (at 88) and applies via its output (83) the frequency-determining digital number to an input (73) of the digital oscillator (71).

REFERENCES:
patent: 4349833 (1982-09-01), Clarke

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