Coarse/fine automatic chrominance gain control using a gain adju

Details Coarse/fine automatic chrominance gain control using a gain adju Coarse/fine automatic chrominance gain control using a gain adju

1983-09-30

1986-08-05

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 40, 358174, H04N 964, H04N 977, H04N 552

Patent

active

046046453

ABSTRACT:
In a television receiver having digital signal processing, an automatic chrominance gain control apparatus employs a combination of analog gain control and digital gain control stages. Specifically, the analog gain control stage provides a range of fine gain control by altering the frequency response characteristic of the intermediate frequency (IF) amplifier circuits. This is sometimes referred to as "IF tilt" control. The digital gain control stage provides coarse gain control in predetermined increments using a shifter in the digital signal processing circuits. The total gain required is calculated and is apportioned between the coarse and fine gain control stages by a microprocessor.

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