An approach for low power hearing aids design

A new low cost filterbank for hearing aids is presented. The analysis stage of the filterbank based on IIR allpass sections with modified response. The modification was performed by forcing phase nonlinearity at the analysis stage to be out of region of interest. By oversampling the filterbank by a factor of 2, the non-linear segments near the band edges was removed through subsequent synthesis filtering. Compared to existing literature designs, the new approach gave a substantial lowering in computational power, and a lower input/output delay.