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Microphone array system for speech enhancement in a motorcycle helmet
Ansvarlig organisasjon
2005 (engelsk)Rapport (Annet vitenskapelig)Alternativ tittel
Mikrofon array system för talförbättring i en motorcycle hjälm (svensk)
Abstract [en]

In this report a real case study of the sound environment within a helmet while driving motorcycle is investigated. A solution to perform speech enhancement is proposed for the purpose of mobile speech communication. A microphone array, mounted onto the face shield in front of the user's mouth, is used to capture the spatio-temporal properties of the acoustic wave ¯eld inside the helmet. The power of the spatially spread noise within the helmet is small when standing still while it may heavily exceed the power of the speech when driving at high speeds. This will result in dramatically reduced speech intelligibility in the communication channel. The highly dynamic noise level imposes a challenge for existing speech enhancement solutions. We propose a subband adaptive system for speech enhancement which consists of a soft constrained beamformer in cascade with a signal-to-noise ratio dependent single microphone solution. The beamformer make use of a calibration signal gathered in the actual environment from the speaker's position. This calibration procedure e±ciently captures the acoustical properties in the environment. Evaluation of the beamformer and the single microphone algorithm, both as either parts by them selves and as a cascaded structure, together with the optimal subband Wiener solution is presented. It is shown that a cascaded combination of the calibrated subband beamforming technique together with the single channel solution outperforms either one by it self, and provides near optimal results at all noise levels.

sted, utgiver, år, opplag, sider
2005.
Serie
Blekinge Institute of Technology Research report, ISSN 1103-1581 ; 5
Emneord [en]
Speech enhancement, Beamforming, adaptive filtering, subband filtering
HSV kategori
Identifikatorer
URN: urn:nbn:se:bth-00272Lokal ID: oai:bth.se:forskinfo40E24875FE4FD6E2C1256FFC00309C53OAI: oai:DiVA.org:bth-00272DiVA, id: diva2:838142
Tilgjengelig fra: 2012-09-18 Laget: 2005-05-09 Sist oppdatert: 2015-06-30bibliografisk kontrollert

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Claesson, Ingvar

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