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Utvärdering av mikrofoner för hörselhjälpmedel
Karlstad University, Faculty of Technology and Science.
Karlstad University, Faculty of Technology and Science.
2014 (Swedish)Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesisAlternative title
Evaluation of Microphones for Hearing Aids (English)
Abstract [sv]

Syftet med detta examensarbete var att undersöka MEMS och elektretmikrofoner för att finna vilken typ som lämpar sig bäst för företaget Comfort Audio AB och deras hörselhjälpmedelsprodukter. Utöver detta undersöktes möjligheter att kontrollera upptagningskarakteristik med hjälp av en teknik vid namn end-fire.

Resultaten har erhållits genom att undersöka ett antal elektroakustiska egenskaper hos olika mikrofoner, som sedan har jämförts med respektive tillverkares tekniska specifikationer. Upptagningskarakteristiken har undersökts genom konstruktion av en mikrofonuppsättning där den summerade signalen undersökts. Analys av signalstyrka och frekvensinnehåll har sedan resulterat i polärdiagram, där upptagningskarakteristik visas.

Specifikationer samt egna beräkningar och mätningar visar att MEMS kan vara ett alternativ till elektretmikrofoner. Riktad upptagning kunde påvisas i end-fire konstruktionen. 

Abstract [en]

The purpose of this study was to investigate MEMS and electret microphones to find the best suited microphone type for the company Comfort Audio AB and their hearing aid products. The study also investigated the possibilities to control microphone polar pattern by using a method called end-fire.

The results have been obtained by examining a number of electro-acoustic properties of different microphones, which have been compared with the manufacturer's specifications. Polar patterns have been studied by construct an end fire array. Analysis of the signal content has resulted in polar diagrams, where characteristics are displayed.

The specifications of the manufacturer’s, our own calculations and measurements shows that MEMS could be an alternative to electret microphones. Difference in polar characteristics was proved in the end-fire array. 

Place, publisher, year, edition, pages
2014. , p. 32
Keywords [sv]
Hörselhjälpmedel, comfort audio, hörsel, end-fire, mikrofoner
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kau:diva-31646OAI: oai:DiVA.org:kau-31646DiVA, id: diva2:703243
External cooperation
Comfort Audio AB
Educational program
Music and Sound Engineering, 180 hp
Supervisors
Examiners
Available from: 2014-03-17 Created: 2014-03-05 Last updated: 2014-03-17Bibliographically approved

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