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Design of Lerner Prototype Filters for Audio Cosine-modulated Filter Banks

Zieliński T.P.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2002

Vol. 50, Nr 1

29--36

In the paper novel application of Lerner prototype filters in audio cosine-modulated filter banks is discussed and their optimal design is addressed. Since the Lerner filters are characterized with small and very fast decaying side-lobe levels they are mainly used in transmultiplexers in digital multicarrier (multitone) communication systems where stopband performance is critical. It is shown in the paper that simple optimization methods are very effective in designing lerner low-pass prototypes that are appropriate for audio compression. Exemplary Lerner filters are designed and compared with prototypes obtained from some other methods having similar computational complexity. The prototype filter used in the MPEG-audio filter bank is used as reference for all results presented in the paper.