Title: Designing nearly tight window for improving time-frequency masking,
Abstract: Many audio signal processing methods are formulated in the time-frequency
(T-F) domain which is obtained by the short-time Fourier transform (STFT). The
property of STFT is fully characterized by window function, and thus designing
a better window is important for improving the performance of the processing
especially when a less redundant T-F representation is desirable. While many
window functions have been proposed in the literature, they are designed to
have a good frequency response for analysis, which may not perform well in
terms of signal processing. The window design must take the effect of the
reconstruction (from the T-F domain into the time domain) into account for
improving the performance. In this paper, an optimization-based design method
of a nearly tight window is proposed to obtain a window performing well for the
T-F domain signal processing.