Issue No. 08 - August (1977 vol. 26)
R.D. Brown , Computer Sciences Corporation
An algorithm has been developed for calculating sequency-ordered fast Walsh-Fourier transforms (FWT's) using an additive recursion formula. Sequency-ordered FWT's of an N-dimensioned sampled data set are generated by a summation recursion of FWT's on subintervals of the data set. The algorithm is fast (N log2 N summations), computer efficient, and can be applied to time-dependent spectral analysis of nonstationary phenomena such as speech.
Sequency-ordered Walsh transform, time-dependent spectral analysis, Walsh-Fourier transform.
R.D. Brown, "A Recursive Algorithm for Sequency-Ordered Fast Walsh Transforms", IEEE Transactions on Computers, vol. 26, no. , pp. 819-822, August 1977, doi:10.1109/TC.1977.1674921