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Improving a transmission planning tool by adding acoustic factors
2009 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The transmission planning tool named the E-model includes factors (e.g. echo, transmission errors and coder types) related to transmission quality of speech transmission in for example telephone lines. It does not include any acoustic parameters that might have impact when increasing the distance between loudspeaker, microphone and the user(s) as in a teleconference system. This thesis investigates the possibility to improve the E-model with acoustic factors. For this report a model of a teleconference system was created and studied by including Speech Transmission Index, STI as a quality measure for speech intelligibility and acoustic quality. The experiment included a model that was created by auralizing a sender and receiver room with Catt acoustics and using Adaptive Multirate Coders (AMR) as transmission coders. The coder type and coder settings was included as factors in the test. Data was gathered by creating and performing a listening test including 21 test persons. By performing a Multi-factor Analysis of Variance (ANOVA) it was proven that STI was a significant factor independent from the other factors included in the test.

Place, publisher, year, edition, pages
Keyword [en]
Technology, E-model, Teleconference, STI, Speech transmission index
Keyword [sv]
URN: urn:nbn:se:ltu:diva-46508ISRN: LTU-EX--09/028--SELocal ID: 422ea5d6-e6e4-47b1-a597-5138cb30fddaOAI: diva2:1019823
Subject / course
Student thesis, at least 30 credits
Educational program
Media Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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