Fixed-point Implementation of Two-channel Iir Filter Banks with Variable Crossover Frequency
نویسندگان
چکیده
A simple tuning scheme that shifts the crossover frequency of the start-up IIR half-band filter pair to the desired location has been introduced recently. In this paper, the approximation of the tuning scheme is derived in a manner that makes this scheme suitable for fixedpoint arithmetic. The effects of the approximation error to the frequency responses and to the complementary properties for two classes of two-channel filter banks are analyzed. Class I denotes the IIR filter pair implemented as a parallel connection of two all-pass filters, whereas Class II stays for the taped cascaded interconnection of two identical all-pass filters. Real-time application of the proposed method is demonstrated on the example filter pairs for fixed-point signal processor implementation.
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