A continuous frequency spectrum (W spectrum) is formed by a data sequence. The W transform of this spectrum is a continuous function which corresponds uniquely to the known data sequence. © 1981.
Wang, Z. (1981). Harmonic analysis with a real frequency function. III. Data sequence. Applied Mathematics and Computation, 9(4), 245–255. https://doi.org/10.1016/0096-3003(81)90015-1