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Surface-acoustic-wave correlation of two signals has been performed by using space-charge nonlinearity in a layered structure of Bi12GeO20-Si-LiNbO3. The two surface waves are collinear and propagate in the same direction. The same structure has also been used in a different mode of operation to perform the functions of convolution and time scaling.
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Wang et al. (1975) studied this question.
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