Cochlear filters design using a parallel dilating-biquads switched-capacitor filter bank
- 1 January 1992
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 4, 2053-2056
- https://doi.org/10.1109/iscas.1992.230371
Abstract
A parallel filter bank is proposed to implement cochlear filters using very-large-time-constant switched-capacitor (SC) biquads. Significant hardware reduction is achieved in three ways. First, the number of biquads is reduced by biquad-sharing such that each channel consists of three biquads in parallel, and a n-channel filter bank requires only n+2 biquads and n sum-gain amplifiers for implementation. Secondly, area-efficient SC biquads are used, and the capacitor spread of each biquad is approximately 1/ square root Omega /sub 0/T, where Omega /sub 0/ is the pole frequency and T is the sampling period. Finally, a lowpass notch biquad is used to avoid a zero at z=-1, which results in a very small capacitor in each biquad. Simulation results for a 32-channel filter bank are given to demonstrate the validity of this design.Keywords
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