A winograd-Fourier transform algorithm for real-valued data
Thomas W. Parsons · IEEE Transactions on Acoustics Speech and Signal Processing · 1979
A modified version of the Winograd-Fourier transform algorithm is presented for use in transforming real vectors. The new algorithm uses real arithmetic and real storage of intermediate results throughout while retaining the economy of Winograd's basic method. The derivation of the transform is explained and some programming techniques are discussed and illustrated.