Digital integrated chrominance-channel circuit with gain control

US4539583A · kind A · utility

Assignee

• ITT Industries · US

Inventors

• Peter M. Flamm · Glückstadt, DE
• Daniel Mlynek · Heimbach, DE
• Friedrich Schmidtpott · Hartheim, DE
• Alfred Praxmarer · Gundelfingen, DE

Key dates

• Filing date: Apr 20, 1983
• Grant date: Sep 3, 1985
• Expiry date: Apr 20, 2003

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N9/68
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

An improved digital integrated chrominance-channel circuit having gain control for color-television receivers includes at least one integrated circuit for digitally processing the composite color signal. The circuit includes a first limiter inserted between a parallel multiplier and a burst-amplitude-measuring stage, and a control stage including a parallel subtracter whose minuend input is fed with a reference signal, and whose subtrahend input is connected to the output of the burst-amplitude-measuring stage. A digital accumulator whose enable input is presented with a signal derived from the trailing edge of a burst gating signal is used as an integrator.