Discrete-coefficient linear-phase prototypes for PR cosine-modulated filter banks
نویسنده
چکیده
In this paper, a method for the design of perfect reconstruction (PR) linear-phase prototypes for cosine-modulated filter banks with discrete coefficients is presented. Such prototypes are of great interest for efficient hardware implementations. The design procedure is based on a subspace approach that allows to linearly combine PR prototype filters in such a way that the resulting filter also is a PR prototype. Within a given subspace the weights of the optimal linear combination can be easily computed via an eigenanalysis. The filter design is carried out iteratively, while the PR property is guaranteed throughout the design process. No non-linear optimization routine is needed.
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