A New Monolithic Chroma Processor

A new integrated circuit is described which includes all the chroma functions prior to chroma demodulation, and which offers substantial advantages in performance and flexibility. Contained in the 16 pin device are the subcarrier regenerator, automatic chroma control (ACC), dc tint and color level controls, color killer and burst gating. The subcarrier regenerator is a phase-locked loop which provides good noise performance and accurate phase control. The dc controls have well defined characteristics. External adjustment of the color killer is provided for. Interaction between the oscillator and chroma channels can have serious consequences, and has been eliminated by careful circuit design.