Abstract
The design and construction of an integrated circuit that automatically detects the modulation sense (positive or negative) of received TV signals is described. The integrated circuit works with a multistandard intermediate frequency (IF) video demodulator and offers other functions such as an analog AFC (automotive frequency control) output; blocks tuning pulses delivered during up- or down-frequency searches when a picture carrier is detected in a range of +or-500 KHz to the (IF) picture carrier; and provides a video identification circuit for sound muting facilities. This circuit is intended to operate as part of multistandard TV IF equipment. >
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