Method and apparatus for encoding and decoding signals

Details Method and apparatus for encoding and decoding signals Method and apparatus for encoding and decoding signals

1989-09-27

1991-10-08

Buczinski, Stephen C.

Cryptography

Cryptanalysis

333147, 333154, 333188, 341 50, 341110, 375 45, 380 25, 380 53, H04K 102, H03H 900, H03M 100

Patent

active

050561375

ABSTRACT:
In a method and apparatus for encoding signals, signals are passed through a body of a material that modifies a characteristic of signals passing therethrough, such as an acousto-electromagnetic. Energy is applied to the body for establishing a standing wave therein, so that the standing wave controls the passage of signals through said body. The energy may be applied by a piezoelectric element. The body or the piezoelectric element may be removable, to form an encoding key.

REFERENCES:
patent: 4209759 (1980-06-01), Volluet
patent: 4281299 (1981-07-01), Newbold
patent: 4323729 (1982-04-01), Westermayer
patent: 4465986 (1984-08-01), Loh et al.

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