Conversion of sequency-limited signals into frequency-limited signals and vice versa (Corresp.)
Henning F. Harmuth, R. de Buda · IEEE Transactions on Information Theory · 1971
Sequency-limited signals, consisting of a superposition of Walsh functions, and frequency-limited signals, consisting of a superposition of sine-cosine functions, can readily be converted from one form to the other without wasting either frequency or sequency bandwidth.