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This paper presents a comparison of two-dimensional finite area impulse response (FIR) digital filters designed using three popular design methodologies -through the use of windows, through the use of transformations of one-dimensional designs, and through the use of optimal Chebyshev design techniques. In addition the comparison includes filters designed for processing both rectangularlysampled and hexagonally-sampled data. The filters are compared with respect to ease of design and the efficiency of the resulting implementation.

A high-resolution method of spectral analysis, of the class generally called "maximum entropy method," was used in a study of aortic porcine valve closing sounds in 37 patients (