Surface wave device for use in a ghost cancellation system

Details Surface wave device for use in a ghost cancellation system Surface wave device for use in a ghost cancellation system

1977-01-05

1977-12-27

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358905, 333 30R, 333 72, 310313, 310366, 325474, H04N 521, H03H 730, H01V 700

Patent

active

040657892

ABSTRACT:
A ghost cancellation system includes a surface-wave device operable for developing a replica of the ghost component of a video signal, which replica is combined with the video signal to eliminate or cancel the ghost component. The surface-wave device comprises an input transducer responsive to a modulated video signal for launching uniform acoustic surface-waves along a path traversing a balanced pair of output transducers and impinging upon a reflector array. The reflector array includes means for initiating non-uniform surface-wave reflections suitable for causing the output transducers to develop an output electrical signal comprising the ghost replica.

REFERENCES:
patent: 3956585 (1976-05-01), Butler et al.
patent: 3988703 (1976-10-01), DeVries
patent: 4013834 (1977-03-01), Kino et al.

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