Method and apparatus for extracting derivatives from surface aco

Details Method and apparatus for extracting derivatives from surface aco Method and apparatus for extracting derivatives from surface aco

1975-11-14

1977-11-01

Wilbur, Maynard R.

Communications: electrical

Selective

Having electron beam device

333 30R, 333 19, 310313, H04B 1100

Patent

active

040568032

ABSTRACT:
An interdigital electrode transducer mounted on an acoustic surface wave propagating medium having an output proportional to an Nth order derivative of the surface acoustic waves propagating in the medium. The Nth order derivative, where N is any real, positive number, is obtained by using a finite difference approximation. The transducer finger pairs are biphase coded and amplitude weighted in order to detect the proper combination of signal differences for the approximation and thereby indicate the desired derivative.

REFERENCES:
patent: 3551837 (1970-12-01), Speiser et al.
patent: 3701147 (1972-11-01), Whitehouse
patent: 3770949 (1973-11-01), Whitehouse et al.
patent: 3879673 (1975-04-01), Shaw
patent: 3936751 (1976-02-01), Holmes et al.

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