Two-track convolver operating with acoustic waves and with suppr

Details Two-track convolver operating with acoustic waves and with suppr Two-track convolver operating with acoustic waves and with suppr

1986-08-20

1989-02-28

Smith, Jerry

Boots, shoes, and leggings

364819, G06G 719

Patent

active

048092134

ABSTRACT:
A two-track convolver has input transducer assemblies at each end of integrated electrodes. Each of the input transducer assemblies is formed of two individual transducers which are connected in series. One of the transducer input assemblies connects to an input signal and the other of the input assemblies connects to a reference signal. Transducers which are diagonally arranged with respect to the two integration electrodes connect to reference potential. For a given input impedance, the system permits a greatest possible chirp duration corresponding to a large length of the individual transducers.

REFERENCES:
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patent: 4701657 (1987-10-01), Grassl
E. Stern et al., "New Adoptive Signal Processing Concept" Electronics Letters, Mar. 7, 1974, pp. 58-59.
M. Luukkala et al., "Convolution and Time Inversion Using Parametric Interactions of Acoustic Surface Waves", Applied Physics Letters, vol. 18, No. 9, May 1, 1971, pp. 393-394.
IEEE-1982 Ultrasonics Symposium-Swanson et al., "Surface Acoustic Wave Convolver Using Counterpropagating Symmetric and Antisymmetric Waveguide Modes", pp. 130-133.
IEEE-1982 Ultrasonics Symposium-Morgan et al., "Spatial Uniformity of S A W Convolvers", pp. 143-148.
Detranould et al., "Acoustic Convolver Using Multistrip Beamwidth Compressors" 1974 Ultrasonics Symposium Proceedings, IEEE Cat. #74 CHO 896-ISU, pp. 224-227.
Yao "High Performance Elastic Convolver with Extended Time-Bandwidth Product", 1981 IEEE Ultrasonics Symposium, pp. 181-185.
IEEE Group on Sonics & Ultrasonics, Oct. 27-29, 1982, San Diego, CA-1982 Ultrasonics Symposium Proceedings, B. R. McAvoy, editor, pp. 113-118.

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