A design of LMS with order adaptation for feedback echo cancellation in hearing aids

Abstract

This paper describes a design of a hybrid adaptive filter for feedback echo cancellation in hearing aids. The proposed design utilizes a multiplexing direct form (MDF) FIR filter, and the LMS algorithm with order adaptation in order to reduce a requirement of a chip area and to minimize power consumption wasted in activities of non active taps. The proposed design can operate up to 6.25MS/s, and could save 26% of power consumption compared to a conventional fixed order FIR filter with LMS adaptation.