Synchronous detector particularly adapted for a video if signal

Details Synchronous detector particularly adapted for a video if signal Synchronous detector particularly adapted for a video if signal

H - Electricity

04

B

350/70

H04B 1/30 (2006.01) H03D 1/04 (2006.01) H03D 1/24 (2006.01) H04B 1/66 (2006.01) H04N 5/455 (2006.01)

Patent

CA 1101987

SO1033 SYNCHRONOUS DETECTOR PARTICULARLY ADAPTED FOR A VIDEO IF SIGNAL ABSTRACT OF THE DISCLOSURE A synchronous detector adapted to detect a modulated information signal, such as a video IF signal. The modulated information signal is provided in the form of a vestigial side- band signal. A band-pass filter including a tuned circuit tuned to the frequency of the carrier on which the information signal is modulated has a pass band which is less than the frequency spectrum of the vestigial sideband signal so as to limit the frequency spectrum of the signal passed by the filter to a double sideband signal. A limiter is coupled to the band-pass filter to receive the double sideband signal and for deriving a switching carrier therefrom, the frequency of the switching carrier being equal to the frequency of the carrier on which the information signal is modulated. An emitter-follower circuit is connected between the band-pass filter and the limiter so as to couple the double sideband signal from the filter to the limiter. A multiplier circuit has first input terminals coupled to the limiter for receiving the derived switching carrier and second input terminals for receiving the modulated information signal, whereby the modulated information signal is multiplied with the switching carrier to obtain the information signal. -i-

303453

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