Inlämning av Examensarbete / Submission of Thesis

Fazal-e-Abbas Chaudhry MEE 07:33, pp. 121. TEK/avd. för telekommunikationssystem, 2007.

The work

Författare / Author: Fazal-e-Abbas Chaudhry
Titel / Title: Speaker Separation Investigation
Översatt titel / Translated title: Högtalareavskiljandeutredning
Abstrakt Abstract:

This report describes two important investigations which formed part of an overall project aimed at separating overlapping speech signals. The first investigation uses chirp signals to measure the acoustic transfer functions which would typically be found in the speaker separation project. It explains the behaviour of chirps in acoustic environments that can be further used to find the room reverberations as well, besides their relevance to measuring the transfer functions in conjunction with speaker separation. Chirps that have been used in this
part are logarithmic and linear chirps. They have different lengths and are analysed in two different acoustic environments. Major findings are obtained in comparative analysis of different chirps in terms of their cross-correlations, specgrams and power spectrum magnitude.

The second investigation deals with using automatic speech recognition (ASR) system to test the performance of the speaker separation algorithm with respect to word accuracy of different speakers. Speakers were speaking in two different scenarios and these were nonoverlapping
and overlapping scenarios. In non-overlapping scenario speakers were speaking alone and in overlapping scenario two speakers were speaking simultaneously.
To improve the performance of speaker separation in the overlapping scenario, I was working very close with my fellow colleague Mr. Holfeld who was improving the existing speech separation algorithm. After cross-examining our findings, we improved the existing speech separation algorithm. This further led to improvement in word accuracy of the speech recognition software in overlapping scenario.

Ämnesord / Subject: Telekommunikation - Telecommunications
Signalbehandling - Signal Processing
Nyckelord / Keywords: Speaker Separation, Acoustics, Cross-correlation, Automatic Speech Recognition, Room Impulse Response, Maximal Length Sequences, Chirps

Publication info

Dokument id / Document id:
Program:/ Programme Magisterprogram i Elektroteknik / Master of Science in Electrical Engineering
Registreringsdatum / Date of registration: 08/21/2007
Uppsatstyp / Type of thesis: D-Uppsats/Magister/Master


Handledare / Supervisor: Prof. Hans-Jürgen Zepernick
Organisation / Organisation: Blekinge Institute of Technology
Institution / School: TEK/avd. för telekommunikationssystem
S-371 41 Karlskrona
+46 455 38 50 00
I samarbete med / In co-operation with: Institute for Telecommunications Research, Defence,Science and Technology Organization
Anmärkningar / Comments:

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Files & Access

Bifogad uppsats fil(er) / Files attached: speaker_separation_investigation.pdf (1025 kB, öppnas i nytt fönster)