engleski

On an iterative method to design oversampled GDFT filterbanks

We have recently proposed an algorithm for the simplified design of generalized DFT modulated filterbanks. The algorithm produces very good designs, but its execution time becomes unacceptably long for prototype filters lengths greater than 200. The main cause is the initialization step, in which an orthogonal filterbank is found. In the present paper, we study two alternative initialization methods. The most successful is based on the design of a reduced length filterbank from which, by interpolation, a good initialization of nominal length can be found. Examples illustrate the quality and eficiency of this approach.

Filterbanks; GDFT; Semi-definite programing

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