Patent ID: 6573943
Filing Date: 2003-06-03
Classification: H04N

Abstract:
A video synchronization signal generating circuit comprising:a negative peak detector having an input and an output; a first amplifier having a first input coupled to an input of the video synchronization signal generating circuit, a second input, and an output coupled to provide an output of the video synchronization signal generating circuit; a second amplifier having a first input coupled to the output of the negative peak detector, a second input coupled to the input of the video synchronization signal generating circuit, and an output coupled to the input of the negative peak detector; and means for providing a voltage offset and for connecting the negative peak detector to the second input of the first amplifier, the means for providing a voltage offset adding voltage to the output of the negative peak detector so that the offset added to the output voltage from the output of the negative peak detector has a value less than a total voltage level of a sync pulse in a composite video signal provided to the input of the video synchronization signal generating circuit.