The Question of Sequency: A Spatial Interpretation of Walsh Analysis

This communication intends to set the Walsh-Fourier transform and the concept of sequency in proper perspective with regard to the other Fourier transforms and the concept of generalized frequency. In doing this, it explains some peculiarities of the Walsh functions and the rather unpromising results, in spite of its computational advantages, achieved in many attempts to use the Walsh-Fourier transform in solving engineering problems.