We present a new method to design prototype filters for conventional cosine-modulated pseudo-quadrature mirror filter (QMF) banks. This method is based on windowing, and sets the 3-dB cutoff frequency of the filter obtained at 2 . In this way, the filter bank performance can be significantly improved compared to other existing design methods.
The two -channel QMF filter bank based on allpass sections is one of the best known circuits for building up a multi -channel filter bank for signal compression. An analysis -synthesis combination can satisfy two of the three PR conditions. The third, phase condition, can be met to any desired accuracy. In this contribution, we consider the development of explicit formulae for the coefficients of such filters. The resulting QMF designs can be used in a wavelet structure for image compression problems using separable filters or Ansari and Lau's method. Several design examples are given including a comparison of performance with FIR filter banks for such problems.
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