A Computational Efficient Method for Assuring Full Duplex Feeling in Hands-free Communication

Abstract:- This report proposes a new method for obtaining satisfying "full-duplex feeling " in hands-free communication units at low computational cost. The proposed method uses a combination of an acoustic echo cancellation unit and an adaptive gain unit. The core of the method is to divide the speech signal into two frequency bands and to process these in different manners. Acoustic echoes in the low frequency band of the signal are cancelled by means of an acoustic echo cancellation unit, while acoustic echoes in the high frequency part are suppressed by an adaptive gain unit. In order to evaluate the use of the proposed method to extend the bandwidth of an existing hands-free phone a real-time implementation of the proposed method is compared with a real-time implementation of a conventional hands-free phone. The evaluation indicates that the extended method can be used to increase the quality of a hands-free phone, with only a small increase in computational demand