Patent ID: 7777813
Filing Date: 2010-08-17
Classification: H04N

Abstract:
1. A color burst automatic detection device comprising: a synchronization separation circuit for extracting a synchronization signal timing signal from a video signal inputted; a burst gate pulse generator for receiving the synchronization signal timing signal extracted by the synchronization separation circuit and a reference clock signal, and generating a timing pulse signal for gating a color burst signal period; a first counter for receiving the video signal and the timing pulse signal generated by the burst gate pulse generator, and counting up a color burst signal present in a burst gate pulse period at a first timing in the video signal; a second counter for receiving the video signal and the timing pulse signal generated by the burst gate pulse generator, and counting up a color burst signal present in the burst gate pulse period at a second timing different from the first timing in the video signal; a switch control circuit for controlling the respective operation timings of the first and second counters; and a color burst determination circuit for receiving count values outputted from the first and second counters, determining presence/absence of a color burst signal superimposed on the video signal, and determining whether the inputted video signal is a composite signal or a component signal.