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Enhancement of Speech Intelligibility using Beamforming Techniques
Blekinge Institute of Technology, School of Engineering.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years))Student thesisAlternative title
Enhancement of Speech Intelligibility using Beamforming Techniques (Swedish)
Abstract [en]

Speech enhancement is a process of enhancing the intelligibility or quality of speech using various audio processing algorithms. The concept of speech enhancement is the most important field for many applications such as teleconferencing systems, speech recognition, VoIP, mobile phones, hearing aids, etc. [1]. The delight of the speech enhancement algorithms using single microphone was tamed and sooner the markets will be dominated by microphone arrays with beamforming techniques in which significantly high signal to noise ratios (SNR) are observed. A considerable amount of research has already been done about the feasibility and advantages of using microphone arrays. Several beamforming techniques are widely applied by researchers round the globe. In this thesis, eight selective beamforming techniques have been applied to enhance the intelligibility of speech degraded by interference. In order to demonstrate the algorithms, a graphical user interface (GUI) has been developed in matlab, where user has a chance to select the number of sensors in the linear array and the spacing between them, source and interference directions, type of algorithm and so on. Also, user can compare all the Beamformers by keeping a default environment. The performances are measured in terms of signal to noise ratio (SNR), speech and noise distortions and ITU-T’s PESQ values. This thesis describes the opportunities and constraints for application of eight beamforming techniques using linear microphone arrays.

Place, publisher, year, edition, pages
2012. , 87 p.
Keyword [en]
Beamforming, Speech Enhancement, Microphone Arrays, PESQ, Delay-and-Sum
National Category
Signal Processing
URN: urn:nbn:se:bth-5397Local ID: diva2:832777
C/o M.V.Subrahmanyam, HIG-89, Bharat Nagar Colony, Hyderabad - 500018 Andhra Pradesh INDIA.Available from: 2015-04-22 Created: 2012-06-07 Last updated: 2015-06-30Bibliographically approved

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