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Multichannel Wiener Filtering for Speech Enhancement in Modulation Domain
Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap.
2011 (Engelska)Självständigt arbete på avancerad nivå (masterexamen)Studentuppsats (Examensarbete)
Abstract [en]

Normally speech signals are contaminated with noise and interference that reduces the intelligibility of speech during communication. In order to make speech signals e ective and useful, they need to be enhanced from the noisy speech signal. In speech processing eld many speech enhancement techniques are developed and are providing very good results. Multichannel microphone array is also one of the techniques used for speech enhancement, that provides better results than the single channel speech enhancement. Moreover, Wiener filtering is the most commonly used technique for multichannel microphone array for speech enhancement. The main focus of this thesis is to implement multichannel microphone array using Wiener filtering in the modulation domain system and also in the time domain system to enhance the speech. Both are implemented successfully and validated e ectively by considering diff erent parameters, i,e; Signal to Noise Ratio (SNR), Signal to Noise Ratio Improvement (SNRI) and Mean Opinion Score (MOS). Both the systems are tested with one female and one male speech distorted with diff erent types of noise at -5dB,0dB,5dB,10dB,15dB and 20dB SNR. The values are calculated for the diff erent number of subbands, as the main focus is on modulation domain system. It provided efficient results in terms of SNRI and MOS score.

Ort, förlag, år, upplaga, sidor
2011. , s. 58
Nyckelord [en]
Filterbank, Coherent Envelope Detection, Incoherent Envelope Detection, Modulation Domain, Multichannel Wiener Filtering
Nationell ämneskategori
Signalbehandling
Identifikatorer
URN: urn:nbn:se:bth-6043Lokalt ID: oai:bth.se:arkivex17B254FC949F58C5C125782200566772OAI: oai:DiVA.org:bth-6043DiVA, id: diva2:833461
Uppsök
teknik
Handledare
Tillgänglig från: 2015-04-22 Skapad: 2011-01-24 Senast uppdaterad: 2015-06-30Bibliografiskt granskad

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