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Talmaskerande ljudsystems inverkan på taluppfattbarheten i ett öppet kontorslandskap
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
2014 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
The effect of a speech masking sound system on speech intelligibility in an open-plan office (English)
Abstract [sv]

I denna rapport undersöks möjligheten att använda talmaskering till att förbättra talintegritet och akustisk arbetsmiljö i öppna kontorslandskap. En av de vanligaste orsakerna till störningar i ett öppet kontorslandskap är ovidkommande tal. Ett talmaskerande system maskerar vissa frekvenser i talet, vilket leder till att störningen från ovidkommande tal minskar. Forskning från Nordamerika har resulterat i ett frekvensspektrum med en optimal och maximal ljudnivå för det maskerande ljudet. För detta arbete valdes ett försökskontor som utvärderades med avseende på rumsakustik. Kontoret uppfyllde krav enligt Svensk Standard SS25268. Arbetsplatsernas utformning var något bristfällig och uppfyllde inte rekommenderad akustisk design. Utgångspunkten till det talmaskerande ljudet var rosa brus. Bruset kalibrerades med en equalizer för att motsvara maskerande frekvensspektrum och skickades ut i kontoret via tio högtalare. Högtalarna monterades mellan undertak och betongbjälklag. Taluppfattbarheten utvärderades från uppmätt STI-värde. Det talmaskerande systemet sänkte taluppfattbarheten från God till Dålig, vilket var önskvärt. Bästa resultat uppmättes då avstånd från ljudkällan var 6 m eller längre.

Abstract [en]

In this report studies has been made to research if it’s possible to improve speech intelligibility and acoustical work environment in open space offices by the use of speech masking. One of the most common causes for open plan office disturbance is irrelevant speech. There is a way to drown out some of the frequencies in speech, by introducing a sound masking system, and reduce the disturbing noise. Earlier research from North America has resulted in a frequency spectrum showing the optimum and maximum sound pressure level for the masking sound. An office was chosen for the experiment was limited and was then evaluated from an acoustical point of view. Results showed that it fulfilled the requisites set by Swedish Standard SS25268. Although the design of the offices spaces was rather flawed and didn’t fulfill recommended acoustical design. The starting point of the sound masking noise was a pink noise. An equalizer was used to calibrate the noise to match the frequency spectrum of the masking sound and was then transmitted into the office through ten speakers. The speakers where mounted in between the precast concrete and suspended ceiling. The speech intelligibility was evaluated from the result of the STI-measurement. The sound masking system lowered the speech intelligibility from Good to Bad, like it was intended to do. The best result was recorded at a distance of 6 m and further away

Place, publisher, year, edition, pages
2014. , 36 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:umu:diva-90278OAI: oai:DiVA.org:umu-90278DiVA: diva2:726840
External cooperation
Tyréns AB
Subject / course
Byggteknik
Educational program
Bachelor of Science Programme in Civil Engineering
Supervisors
Examiners
Available from: 2014-06-23 Created: 2014-06-18 Last updated: 2014-06-23Bibliographically approved

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Examensarbete Samuel Fredriksson(1048 kB)481 downloads
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Type fulltextMimetype application/pdf

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