  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
properties of the STFT are fully characterized by window function, number of
frequency channels, and time-shift. 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.
