Patent ID: 6943828
Filing Date: 2005-09-13
Classification: H04N

Abstract:
1. Apparatus for processing a television signal, comprising: a signal input for receiving a television signal from one of a plurality of signal source types, each of the plurality of signal source types being associated with a respective signal source and providing respective television signals; a tuner coupled to the signal input; a signal processor, coupled to the tuner, for extracting a horizontal synchronization signal from the received television signal; and a horizontal synchronization signal detector for sampling the horizontal synchronization signal; and a horizontal synchronization signal processor, coupled to the horizontal synchronization signal detector, for processing the horizontal synchronization signal to determine a quality measure of the received television signal, and enabling or disabling the display of the received television signal in response to the quality measure, wherein the horizontal synchronization signal processor adaptively processes the horizontal synchronization signal to determine a quality measure of the received television signal by comparing the amplitude of the horizontal synchronization signal with a threshold amplitude level established in response to the signal source type of the received television signal and generating a display signal in response to the determined quality measure.