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Spatial Audio for the Mobile User
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT. KTH, School of Information and Communication Technology (ICT), Centres, Center for Wireless Systems, Wireless@kth. (CCSlab)
2005 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Voice over the Internet Protocol (VoIP) is one of the latest and most successful Internet services. It takes advantage of Wireless Local Area Networks (WLANs) and broadband connections to provide high quality and low cost telephony over the Internet or an intranet. This project exploits features of VoIP to create a communication scenario where various conversations can be held at the same time, and each of these conversations can be located at a virtual location in space. The report includes theoretical analysis of psychoacoustic parameters and their experimental implementation together with the design of a spatial audio module for the Session Initiation Protocol (SIP) User Agent “minisip”. Besides the 3D sound environment this project introduces multitasking as an integrative feature for “minisip”, gathering various sound inputs connected by a SIP session to the “minisip” interface, and combining them altogether into a unique output. This later feature is achieved with the use of resampling as a core technology. The effects of traffic increment to and from the user due to the support of multiple streams are also introduced.

Abstract [sv]

Röst över Internet Protocol (VoIP) är en av de senaste och mest framgångsrika Internettjänsterna. Det utnyttjar Trådlösa Nätverk och bredband för att erbjuda högkvalitativ och billig telefonering över Internet eller ett Intranät. Det här projektet använder sig av VoIP för att skapa ett kommunikationsscenario där flera olika konversationer kan hållas samtidigt och där varje konversation kan placeras på en virtuell plats i rymden. Rapporten innehåller en teoretisk analys av psykoakustiska parametrar och deras experimentella genomförande tillsammans med design av en 3D ljud modul för Session Initiation Protocol (SIP) User Agent ”minisip”. Förutom ljudmiljön i 3D introducerar projektet multitasking som en integrerbar del av ”minisip”. Alla tänkbara ljudkällor baserade på SIP förbindelser samlas med ”minisip” interfacet och kombineras till en enda utsignal. Detta uppnås med hjälp av resampling som kärnteknologi. Effekterna av att mer trafik når användaren på grund av stödet av multiple källor introduceras också.

Place, publisher, year, edition, pages
2005. , 68 p.
Series
TRITA-IMIT-LCN. AVH, ISSN 1651-4106 ; 2005-01
Keyword [en]
voice over ip, spatial audio, minisip, resampling, multitasking, multiconferencing
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:kth:diva-92300OAI: oai:DiVA.org:kth-92300DiVA: diva2:513181
Subject / course
Telecommunication Systems
Presentation
2005-02-14, Seminar room Grimeton, Isafjordsgatan 30B, Kista, 13:00 (English)
Uppsok
Technology
Supervisors
Examiners
Available from: 2012-04-02 Created: 2012-03-30 Last updated: 2017-02-06Bibliographically approved

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CiteExportLink to record
Permanent link

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Citation style
  • apa
  • harvard1
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Output format
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