Inlämning av Examensarbete / Submission of Thesis

NAVEEN KUMAR THUPALLI , pp. 53. ING/School of Engineering, 2012.

The work

Författare / Author: NAVEEN KUMAR THUPALLI
Abstrakt Abstract:

Recognition of speech at the receiver end generally gets degraded in distant talking atmospheres of laptops, teleconfereing, video conferences and in hands free telephony, where the quality of speech gets contaminated and severely disturbed because of the additive noises. To make useful and effective, the exact speech signals has to be extracted from the noise signals and the user has to be given the clean speech. In such conditions the convenience of microphone array has been preferred as a means of civilizing the quality of arrested signals. A consequential growth in laptop technology and microphone array processing have made possible to improve intelligibility of speech while communication. So this contention target on reducing the additive noises from the original speech, beside design and use of different algorithms. In this thesis a multi-channel microphone array with its speech enhancement of signals to Wiener Beamformar and Generalized side lobe canceller (GSC) are used for Laptops in a noisy environment.
Systems prescribed above were implemented, processed and evaluated on a computer using Mat lab considering SNR, SNRI as the main objective of quality measures. Systems were tested with two speech signals, among which one is Main speech signal and other is considered as Noise along with another random noise, sampling them at 16 KHz .Three Different source originations were taken into consideration with different input SNR’s of 0dB, 5dB, 10dB, 15dB, 20dB, 25dB.
Simulation Results showed that Noise is been attenuated to a great extent. But Variations in SNR and SNRI has been observed, because of the different point origination of signals in the respective feilds.Variation in SNR and SNRI is been observed when the distance between the main speech originating point and microphone is too long compared to the noise signals. This states that origination of signals plays a huge role in maintaining the speech quality at the receiver end.

Ämnesord / Subject: Signalbehandling - Signal Processing
Mathematics\Discrete Mathematics
Nyckelord / Keywords: Wiener Beamformer, Speech Enhancement, Generalized side lobe canceller

Publication info

Dokument id / Document id: houn-8ulcdn
Program:/ Programme Magisterprogram i Elektroteknik / Master of Science in Electrical Engineering
Registreringsdatum / Date of registration: 05/24/2012
Uppsatstyp / Type of thesis: Masterarbete/Master's Thesis (120 credits)


Handledare / Supervisor: Dr. Nedelko Grbic
Examinator / Examiner: Dr. Benny Sällberg
Organisation / Organisation: Blekinge Institute of Technology
Institution / School: ING/School of Engineering

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I samarbete med / In co-operation with: Blekinge Institute of Technology
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Files & Access

Bifogad uppsats fil(er) / Files attached: bth2012naveen.pdf (1362 kB, öppnas i nytt fönster)