Acoustic Echo Cancelling and Noise Suppression with Microphone Arrays

Document type: Researchreports
Full text:
Author(s): Nedelko Grbic, Mattias Dahl, Ingvar Claesson
Title: Acoustic Echo Cancelling and Noise Suppression with Microphone Arrays
Translated title: Akustisk Eko- och Brus-undertryckning med Mikrofon Arrayer
Series: Research Report
Year: 1999
Issue: 4
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
+46 455 780 00
Authors e-mail: nedelko.grbic@its.hk-r.se
Language: English
Abstract: This report presents a method to achieve acoustic echo canceling and noise suppression using microphone arrays. The method employs a digital self-calibrating microphone system. The on-site calibration process is a simple indirect calibration which adapts in each specific case to the environment and the electronic equipment used. The method also continuously reduces environmental disturbances such as car engine noise and fan noise. The method is primarily aimed at hands free mobile telephones by suppressing the hands free loudspeaker and car cabin noise simultaneously. The report also contains an evaluation of the impact of echo and noise suppression on a real conversation, accomplished in a car using a microphone array.
Summary in Swedish: Genom att använda mikrofon arrayer kan talförbättring erhållas i handsfree telefon utrustning. Vi presenterar en metod att utföra detta för ett mobiltelefon system som monteras i en bil. Vi använder oss av sex mikrofonelement vars signaler behandlas under pågående samtal så att talkvaliten förbättras. Resultat från en verklig situation presenteras. Denna visar en väsentlig talförbättring.
Subject: Signal Processing\Speech Enhancement
Keywords: Microphone Arrays, Neural Networks, Echo Canceling, Noise Suppression
URN: urn:nbn:se:bth-00126
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