Two-Channel IIR Filter Banks Utilizing the Frequency-Response Masking Technique

Abstract

In this paper, a new approach for a twochannel IIR filter bank based on the frequency-response masking technique is presented. A model filter pair is a double complementary IIR filter pair implemented as a parallel connection of two all-pass filters. Masking filters are linear-phase FIR filters. The resulting overall filter pair is nearly power complementary, and simultaneously achieves high sub-channel selectivity. The approximately linear phase of channel filters is achieved with an IIR model filter pair of an approximately linear phase. Compared to the traditional solution based on FIR filters only, the proposed filter bank exhibits a smaller overall delay and requires a smaller number of multipliers for implementation.

Keywords

• complementary filter pairs
• digital filters
• filter banks
• frequency-response masking