Patent ID: 6519298
Filing Date: 2003-02-11
Classification: H04N

Abstract:
A circuit for discriminating between received signals, comprising:means for detecting a peak signal based on an overall correlation degree between a received signal and a reference signal; and means for generating a discrimination signal for showing that the received signal is a high definition signal having a predetermined digital signal format if the peak signal is detected in a predetermined period and showing that the received signal is an analog broadcast signal if the peak signal is not detected in the predetermined period; wherein the detecting means comprises: a first correlator for obtaining a first correlation degree between said received high definition signal and a first reference signal and providing a first correlation value; a second correlator for obtaining a second correlation degree between said received high definition signal and a second reference signal and providing a second correlation value; a first peak detector for providing a first peak signal when the first correlation value is larger than a first reference value; and a second peak detector for providing a second peak signal when the second correlation value is larger than a second reference value.