A new class of orthonormal transforms
P.S. Moharir, S.K. Varma · IEEE Transactions on Acoustics Speech and Signal Processing · 1981
A new technique of obtaining a complete orthonormal transform based on a particular interpretation of DFT is developed. One such transform, namely, the Fourier-twiddled H-DF transform, has been discussed in detail. The permutation properties of such transforms can be deduced from the knowledge of the permutation properties of the two component transforms.