engleski

Design of two-channel FIR filterbanks with rational sampling factors by using the frequency-response masking technique

This paper considers the use of the frequency response masking (FRM) technique for designing finite-impulse response (FIR) filters generating nearly perfect-reconstruction (NPR) two-channel filterbanks with rational sampling factors in the case where the processing unit between the analysis and synthesis banks significantly changes the two input signals. In this particular case, even the use of the perfect-reconstruction filter bank is not enough to compensate the modifications performed at the processing unit due the aliasing errors occurring in the analysis bank. The only way to keep these errors as low as possible is to use filter banks with very narrow transition bandwidths. Based on the properties of FIR filters, this implies the use of high order filters, requiring a larger number of multipliers and adders. In order to significantly reduce the number of the coefficients required by the overall filter bank implementation, this paper properly exploits the FRM technique for designing the above-mentioned two-channel filter banks. The benefits of using the modified FRM approach for generating NPR two-channel filterbanks with rational sampling factors is illustrated by means of an illustrative example.

Rational Filterbanks; FRM technique; Two-channel filterbanks

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