Ghost signal erasing system

Details Ghost signal erasing system Ghost signal erasing system

1975-04-17

1977-03-22

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

178DIG44, 333 30R, 310 98, 310 81, H04N 544, H03H 730, H01V 700

Patent

active

040138348

ABSTRACT:
A ghost signal erasing system for television receivers in which a variable delay element utilizing the propagation of an elastic surface wave is used. The variable delay element includes a piezoelectric substrate, a plurality of first interdigitated electrode pairs formed on the substrate and a plurality of second interdigitated electrode pairs also formed on the substrate. An elastic surface wave produced by applying a video i-f signal to the first interdigitated 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.

REFERENCES:
patent: 2448635 (1948-09-01), Smith
patent: 3479572 (1969-11-01), Pokorny
patent: 3482168 (1969-12-01), Sasao
patent: 3749984 (1973-07-01), Benyon et al.
patent: 3818379 (1974-06-01), Wauk
patent: 3894251 (1975-07-01), Shibayama

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