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Many audio signal processing methods are formulated in the time-frequency(T-F) domain which is obtained by the short-time Fourier transform (STFT). Theproperties of the STFT are fully characterized by window function, number offrequency channels, and time-shift. Thus, designing a better window isimportant for improving the performance of the processing especially when aless redundant T-F representation is desirable. While many window functionshave been proposed in the literature, they are designed to have a goodfrequency response for analysis, which may not perform well in terms of signalprocessing. The window design must take the effect of the reconstruction (fromthe T-F domain into the time domain) into account for improving theperformance. In this paper, an optimization-based design method of a nearlytight window is proposed to obtain a window performing well for the T-F domainsignal processing.

Designing nearly tight window for improving time-frequency masking