Design of DFT modulated filter bank for speech processing in hearing aids
Cai Min Yu · Shengxue jishu · 2012
This paper proposes a simple method of designing an oversampled,near-perfect reconstruction DFT modulated filter bank.According to the requirement of system distortion and aliasing power,a simple objective function is introduced,and the prototype filter is designed with the equiripple method.Compared with traditional methods,the proposed method optimizes a single parameter instead of the complex nonlinear optimization,and the design process is simplified.This approach can minimize the passband error under the filter-bank design criteria.By using weighted overlap and add(WOLA) structure,the system can be implemented efficiently,which is suitable for speech signal analysis and synthesis in hearing aids.