Ghost signal erasing system

Details Ghost signal erasing system Ghost signal erasing system

H - Electricity

04

N

350/81

H04N 5/21 (2006.01) H04N 5/44 (2006.01)

Patent

CA 1050158

ABSTRACT OF THE DISCLOSURE A ghost signal erasing system for television receivers in which a variable delay element utilizing the propagation of an elastic surface wave is used as a delay circuit. The variable delay element includes a piezoelectric substrate, a plurality of first interdigitated electrode pairs formed on the substrate and a plurality of second interdiginated electrode pairs also formed on the substrate. An elastic surface wave produced by applying a video i-f signal to the first interdiginated electrode pairs is propagated along the surface of the piezoelectric substrate and taken up at the second interdigitated electrode pairs as a delayed a-c signal. By switching the first and second interdigitated electrode pairs to change the combination thereof, various delay times are obtained.

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