A Computational Efficient Method for Assuring Full Duplex Feeling in Hands-free Communication
Blekinge Institute of Technology, Department of Telecommunications and Signal Processing2003 (English)Report (Other academic)Alternative title
En beräkningseffektiv metod för högtalande telefoni med full duplex känsla (Swedish)
This report proposes a 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 perform the processing of the speech signal into two separate frequency bands and to process these in different manners. Acoustic echoes in the low frequency part 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. The proposed method is well suited when extending the bandwidth of an existing hands-free phone. A real-time implementation of a conventional hands-free phone is compared with a real-time implementation according to the proposed method, where the later is an extended version of the first. The evaluation of the two implementations shows that the proposed method can be used to increase the quality, i.e. extended bandwidth, of a hands-free phone with only a small increase in computational demand.
Place, publisher, year, edition, pages
Blekinge Tekniska Högskola Forskningsrapport, ISSN 1103-1581 ; 9
Hands-Free, Full Duplex, Acoustic Echo Cancellation
IdentifiersURN: urn:nbn:se:bth-00220Local ID: oai:bth.se:forskinfo4973EE8B818A6C83C1256DDB0028B414OAI: oai:DiVA.org:bth-00220DiVA: diva2:838084