Integrable hue control circuit having a d.c. setting element

Details Integrable hue control circuit having a d.c. setting element Integrable hue control circuit having a d.c. setting element

1984-03-05

1985-08-06

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 9535

Patent

active

045339392

ABSTRACT:
In a hue control circuit for controlling the phase between a color synchronizing signal and a chrominance signal by a setting element (57), this phase control is obtained without the amplitude being influenced, by deriving (via 17) from the original color synchronizing or chrominance signal a color synchronizing or chrominance signal whose phase is shifted through 90.degree. and by controlling the amplitude of each of these color synchronizing or chrominance signals and adding these signals together (in 35). One color synchronizing or chrominance signal is amplitude-controlled cosinusoidally (by 25) and the other color synchronizing or chrominance signal is amplitude-controlled sinusoidally (by 13) by means of the setting element (57).

REFERENCES:
patent: 3781701 (1973-12-01), Cecchin et al.
patent: 4051519 (1977-09-01), Harwood
patent: 4253109 (1981-02-01), Tzakis

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