PSYCHOACOUSTICALLY MOTIVATED NONUNIFORM COSINE MODULATED POLYPHASE FILTER BANK

Nonuniform cosine modulated filter bank is presented as valuable solution for perceptual sound processing systems. Proposed structure connects polyphase concept with idea of warping frequency by all-pass transformation. So it has uncommon flexibility of bandwidths shaping, relatively easy design and good performance. System is considered in context of criticalbands model approximation as front-end for audio coding and enhancement. Theoretical basics of fundamental ideas are reviewed and connecting them into final solution is shown. Issues of the design and details of the implementation are discussed, basing on examples of filter banks approximating well-known nonlinear Bark and ERB psychoacoustic scales. Perspectives of real-time dynamic tuning up the bandwidths are also considered.

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