Abstract
In this paper, an improved Exponential window is developed for designing M-channel cosine-modulated pseudo QMF banks. The Exponential window is modified by adding third parameter (ρ), which improves the spectral characteristic of a window in terms of smaller ripple ratio, wider main lobe width with improved side lobe roll-off ratio. When it is exploited for designing multi-channel cosine modulated filter banks, the modified Exponential window gives better performance for higher band as compared to lower band. In addition to this, the modified Exponential window performs better performance at lower stopband attenuation. When compared with modified Cosh and Kaiser windows, the modified Exponential windows performs better in terms of amplitude distortion, aliasing distortion (AD) and computational time (CPU time) for the same design specifications. Several examples are included to illustrate the effectiveness of this window in the field multirate systems designing.
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