Surface acoustic wave devices and applications: 5. Signal processing using programmable non-linear convolvers

Abstract Non-linear interactions of propagating waves, particularly surface acoustic waves, can be exploited to perform several signal processing functions including correlation. These devices perform essentially as linear filters, with the response determined electronically by an externally applied reference waveform. The latter can be chosen almost arbitrarily, giving a very high degree of programmability. Several types of convolver are reviewed and the signal processing functions, which in principle apply to all types, are derived. The device efficiency, and the maximum usable waveform duration, are shown to vary according to the function performed. The distinctions between convolvers and linear filters have important implications for practical systems, and are discussed in the context of programmable matched filtering.

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