Boots – shoes – and leggings
Patent
1976-03-31
1978-02-21
Hecker, Stuart N.
Boots, shoes, and leggings
364862, 333 30R, 365 45, 365145, 365157, G06G 719, G11C 2700
Patent
active
040757064
ABSTRACT:
A continuously programmable matched filter device using a piezoelectric substrate capable of propagating acoustic wave signals on a selected surface thereof and a semiconductor substrate mounted adjacent and spaced from such surface. Means are provided for altering the conductivity pattern in the semiconductor substrate in accordance with the wave form of a reference wave signal so that a representation of the reference wave is effectively stored therein. Storage of the reference is achieved with electrostatic charge by supplying a plurality of electrons in the spatial region between the substrates or by manipulating the carriers in the semiconductor material into trapping states in order to produce such altered conductivity pattern. A second signal can thereupon be propagated along the piezoelectric substrate to interact with the stored reference conductivity pattern to provide either correlation or convolution operation depending on the direction of propagation thereof along the piezoelectric surface.
REFERENCES:
patent: 3935564 (1976-01-01), Quate et al.
patent: 3953836 (1976-04-01), Kantorowicz
patent: 3975696 (1976-08-01), Kantorowicz
Bert et al., Signal Processing by Electron-Beam Interaction with Piezoelectric Surface Waves, IEEE Transactions of Sonics and Ultrasonics, vol. 50-20, No. 2, 4/73, pp. 173-181.
Stern et al., New Adaptive-Signal-Processing Concept, Electronic Letters, vol, 10, No. 5, 3/7/74, pp. 58-59.
Ingebrigtsen et al., A Schottky-Diode Acoustic Memory and Correlator, Applied Physics Letters, vol, 26, No. 11, 6/1/75, pp. 596-598.
Smith Henry I.
Stern Ernest
Williamson Richard C.
Hecker Stuart N.
Massachusetts Institute of Technology
O'Connell Robert F.
Santa Martin M.
Smith, Jr. Arthur A.
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