The Influence of Diffraction and Dispersion on the Fidelity of Degenerate Convolution

Both diffraction and dispersion degrade the signal processing fidelity of acoustic surface wave (ASW) convolvers. It is shown that both effects can be simulated on a model convolver by means of linear passive pre or post-distortion filters. In practice, a degree of compensation can be achieved by using inverse networks. Emphasis is placed on deriving design formulas that allow distortion levels to be estimated without extensive computation. Distortion network characteristics required are related to convolver layout. A number of typical design examples are considered.