Dual-Microphone Spectral Subtraction

Document type: Researchreports
Full text:
Author(s): Harald Gustafsson, Ingvar Claesson, Sven Nordholm, Ulf Lindgren
Title: Dual-Microphone Spectral Subtraction
Translated title: Två-Mikrofons Spectral Subtraktion
Series: Research Report
Year: 2000
Issue: 2
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: hgu@its.hk-r.se
Language: English
Abstract: Mobile phones are constantly decreasing in size, thereby complicating the acoustical functionality. Signal processing methods can be used to partially mitigate this problem. In this paper we suggest a method which uses multiple spectral subtraction functions and two microphones,
introducing only a short signal delay. The idea is to use spectral subtraction methods to extract the noise as well as the speech during a single time-frame. The environment background noise may not be stationary, thereby limiting the method to only employ short estimates of the background
noise signal. Results are presented for experiments in various environments, showing a reduced noise level in the processed signal compared with the un-processed signal, and with preserved speech quality.
Summary in Swedish: mobiltelefon, brusreducering, två (2) mikrofoner, spectral subtraktion
Subject: Signal Processing\Speech Enhancement
Keywords: Mobile telephone, noise reduction, speech enhancement, dual two (2) microphones, spectral subtraction
URN: urn:nbn:se:bth-00149