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Trådlös strömning av en ljudsignal till multipla mottagare
KTH, School of Technology and Health (STH), Data- och elektroteknik.
2013 (Swedish)Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesisAlternative title
Wireless streaming of an audio signal to multiple receivers (English)
Abstract [sv]

I detta examensarbete har det undersökts vilken teknik för trådlös kommunikation som passar bäst att användas då en ljudsignal ska strömmas trådlöst till multipla mottagare. De tekniker som jämfördes var Wi-Fi och Bluetooth. Andra tekniker för trådlös kommunikation, ZigBee, ANT+ och NFC, valdes bort för att deras maximala datahastighet eller räckvidd inte var tillräcklig. 3G och 4G valdes bort för att det krävs en licens för att få använda dessa. Som mottagare skulle i första hand Android- och iOS-mobiltelefoner användas. Dessutom har det undersökts vilka komponenter som behövs för att tillverka en prototyp som ska kunna strömma en ljudsignal trådlöst till multipla smartphones. Slutligen gjordes ett kopplingsschema för denna prototyp.

Wi-Fi med WLAN-infrastruktur ansågs vara bäst lämpad för denna applikation. Prototypen som skulle strömma ljudsignalen behövde därför kunna fungera som en Wi-Fi-accesspunkt. Wi-Fi-chipet AR9271 från Qualcomm Atheros valdes att användas som Wi-Fi-sändare för att den har open-source firmware och var lättare att få tag på jämfört med andra liknande Wi-Fi-chip. För att kunna använda Wi-Fi-chipets Linuxbaserade open-source firmware valdes SAM9M10 MCU från Atmel att användas som kontrollenhet då denna kan användas med Linux Embedded. För att digitalisera den analoga ljudsignalen valdes VS1063 Mp3-kodare från VLSI Solution.

Abstract [en]

This thesis has examined which wireless technology that is best suited for use when an audio signal are to be streamed wirelessly to multiple recipients. The technologies that where compared was Wi-Fi and Bluetooth. Other wireless communication technologies, ZigBee, ANT+ and NFC, were excluded because their maximum data rate or range wasn’t sufficient enough. Since it’s required a license to be allowed to use 3G and 4G, these were excluded as well.  As receivers, primarily Android and iOS phones would be used. Furthermore, it has been examined which components that are required for manufacturing a prototype that will be able to stream an audio signal wireless to multiple smartphone’s. Lastly, a circuit diagram for this prototype has been made.

Wi-Fi WLAN infrastructure was considered to be best suited for this application. The prototype that would stream an audio signal therefore needed to function as a Wi-Fi access point. AR9271, a Wi-Fi chip from Qualcomm Atheros, was selected to be used as Wi-Fi transmitter because it has an open-source firmware and were easier to come by compared to other similar Wi-Fi chip. To be able to use the Linux-based open-source firmware of the Wi-Fi chip, SAM9M10 MCU from Atmel was selected as control unit since it can be used with Linux Embedded. In order to digitize the analog audio signal, VS1063 MP3 encoder from VLSI Solution was selected.

Place, publisher, year, edition, pages
2013. , 51 p.
Series
Trita-STH, 2013:35
Keyword [en]
streaming, wireless communication, Bluetooth, Wi-Fi, smartphone, WLAN infrastructure, Wi-Fi chip, Mp3 encoder
Keyword [sv]
strömning, streaming, trådlös kommunikation, Bluetooth, Wi-Fi, smartphone, WLANinfrastruktur, Wi-Fi-chip, Mp3-kodare
National Category
Communication Systems Embedded Systems
Identifiers
URN: urn:nbn:se:kth:diva-123557OAI: oai:DiVA.org:kth-123557DiVA: diva2:628192
Subject / course
Electronics and Communications
Educational program
Bachelor of Science in Engineering - Electrical Engineering
Uppsok
Technology
Supervisors
Examiners
Available from: 2013-10-03 Created: 2013-06-12 Last updated: 2013-10-03Bibliographically approved

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