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

Document type: Researchreports
Full text:
Author(s): Fredric Lindström, Mattias Dahl, Ingvar Claesson
Title: A Computational Efficient Method for Assuring Full Duplex Feeling in Hands-free Communication
Translated title: En beräkningseffektiv metod för högtalande telefoni med full duplex känsla
Series: Research Report
Year: 2003
Issue: 9
ISSN: 1103-1581
Organization: Blekinge Institute of Technology
Department: Department of Telecommunications and Signal Processing (Institutionen för telekommunikation och signalbehandling)
Department of Telecommunications and Signal Processing S-372 25 Ronneby
+46 455 38 50 00
Authors e-mail: fredric.lindstrom@konftel.com
Language: English
Abstract: 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.
Subject: Signal Processing\General
Signal Processing\Speech Enhancement
Keywords: Hands-Free, Full Duplex, Acoustic Echo Cancellation
URN: urn:nbn:se:bth-00220
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