Microprocessor controlled picture in picture system

Abstract

The digital signal processing technique is currently used in a wide variety of consumer application equipment. It allows high signal fidelity, cost effectiveness and function extensibility, which is essential in the new generation of TV sets and VCRs. One of the important functions in consumer equipment is the Picture-in-Picture (PIP) which allows the TV viewer to monitor two TV images from different video sources, simultaneously, on the same TV screen. In conventional PIP systems, the control section is implemented with dedicated logic, which often entails a major redesign when minor changes to the system are required. This paper outlines the architecture of a microcontrolled picture in picture system, designed mainly with off-the-shelf components, which adds lower cost to the very flexible concept. The memory section of the system has a special arrangement, which simulates a two port memory and has basically a four field storage capacity in order to avoid the joint-line problem and jolt defects in the subpicture 1. © 1990 IEEE