Signal Processing by Parametric Interactions in Delay-Line Devices

A new type of signal-processing device which employs the parametric interaction between surface or volume acoustic waves passing in opposite directions through an acoustic delay line is described. These devices are capable of giving the real-time convolution of two modulated signals, and the time inversion of an arbitrary signal. As one signal acts as the reference for the other, a virtually infinite range of electronically variable signal-processing functions, such as recognition of digital codes, pulse compression of an FM chirp, and the realization of a fast Fourier transform, is possible. Early devices which employed the nonlinearity of the acoustic medium tended to give outputs of the order of 60 dB less than the input signal. Recent developments, in which a semiconductor placed near the piezoelectric medium interacts with the acoustic wave, have yielded results where the loss from input to output is of the order of 30 dB.

[1]  L. O. Svaasand,et al.  INTERACTION BETWEEN ELASTIC SURFACE WAVES IN PIEZOELECTRIC MATERIALS , 1969 .

[2]  Yu. V. Gulyaev,et al.  Electroacoustic Surface Waves in Solids , 1969 .

[3]  B.R. Tittmann,et al.  Application of Nonlinear Interactions in Ferroelectric Ceramics to Microwave Signal Processing , 1972, IEEE Transactions on Sonics and Ultrasonics.

[4]  Jeffrey L. Bleustein,et al.  A NEW SURFACE WAVE IN PIEZOELECTRIC MATERIALS , 1968 .

[5]  Gordon S. Kino,et al.  Surface-wave parametric signal processing , 1971 .

[6]  Charles Susskind,et al.  Fundamentals of Microwave Electronics , 1964 .

[7]  T. Kawamura,et al.  Acoustic-Surface-Wave Convolver Using Nonlinear Electron Interactions in Coupled Semiconductor-Piezoelectric Systems , 1972 .

[8]  J. Chambers,et al.  Parametric interaction of acoustic-surface wedge waves , 1972 .

[9]  Calvin F. Quate,et al.  CONVOLUTION AND CORRELATION IN REAL TIME WITH NONLINEAR ACOUSTICS , 1970 .

[10]  Calvin F. Quate,et al.  Nonlinear Interaction of Microwave Electric Fields and Sound in LiNbO3 , 1971 .

[11]  O. W. Otto,et al.  Lithium-niobate-silicon surface-wave convoluter , 1972 .

[12]  Gordon S. Kino,et al.  Parametric Interactions of Raleigh Waves , 1972 .

[13]  John Dwight Larson.  Acoustic Wave Generation by Piezoelectric Plates and Films. , 1971 .

[14]  M. Luukkala,et al.  Acoustic Convolution and Correlation and the Associated Nonlinearity Paramaters in LiNbO3 , 1972 .

[15]  W. C. Wang,et al.  Surface Wave Convolver Via Space Charge Nonlinearity , 1972 .

[16]  C. F. Quate,et al.  Nonlinear interaction of acoustic surface waves in epitaxial gallium arsenide , 1972 .

[17]  H. J. Shaw,et al.  Time reversal and correlation at 1.35 GHz using nonlinear interaction in a bulk acoustic-wave device , 1972 .

[18]  Robert L. Gunshor,et al.  Enhancement of Nonlinearity in Surface‐Acoustic‐Wave Propagation from Coupling to Charge Carriers , 1972 .

[19]  M. Luukkala,et al.  CONVOLUTION AND TIME INVERSION USING PARAMETRIC INTERACTIONS OF ACOUSTIC SURFACE WAVES , 1971 .

[20]  A. R. Hutson,et al.  Elastic Wave Propagation in Piezoelectric Semiconductors , 1962 .

[21]  H. J. Shaw,et al.  Variable-bandwidth frequency-modulation chirp pulse compression using a longitudinal acoustic-wave convolver at 1.3 GHz , 1972 .