Digital video signal processor for a television receiving device adapted to display at least a sub-screen image in a main screen image in a picture-in-picture (PIP) mode on a corresponding screen.

摘要

An art processor in a picture-in-picture system which performs a given art processing to a subscreen when subscreen the same image source as a main screen. One embodiment to carry out the objects of the invention includes a first synchronous signal detector and a second synchronous signal detector which detect synchronous signals from image sources received, an exclusive OR gate for comparing a first synchronous signal and a second synchronous signal, an integrator for integrating said synchronous signals, a monostable multivibrator for producing a pulse signal having a given width, a DC generator for changing said pulse signal to a smooth DC signal, a driving signal generator for producing a driving signal by use of said DC signal, a switching stage for switching a plurality of input lines of PIP signal according to said driving signal, and a D/A converter for generating a given art signal for the subscreen.