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En effektiv lektion: En interventionsstudie kring akustikåtgärder och taluppfattbarhet hos en femteklass
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
2015 (Swedish)Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesisAlternative title
An effective class : An interventional study of how changes in room acoustics affect speech intelligibility and time efficiency in a fifth grade class (English)
Abstract [sv]

Detta är en interventionsstudie av hur rumsakustiken i ett klassrum påverkar en lektion

beträffande tidseffektivisering samt taluppfattbarhet. Studien jämför resultat av olika

mätningar och tester före och efter en rumsakustisk åtgärd i form av ett nedpendlat akustiktak.

Åtgärden utförs i ett klassrum på S:t Hansskolan i Visby, i syfte att undersöka huruvida en

förbättring av ljudmiljön i klassrummet kan ge positiva samhällsekonomiska effekter.

De mätningar och tester som genomförts ger tillsammans en bild av klassrummets akustiska

egenskaper före och efter åtgärden. Mätningarna innefattar tidtagning av uppstartstid av en

lektion samt olika rumsakustiska mätningar och tester beträffande taluppfattbarhet.

Mätningar visar att klassrummets ljudmiljö efter den rumsakustiska åtgärden har förbättrats

med kortare efterklangstider, förbättrade förhållanden med rummets reflexer samt ett

förbättrat talöverföringsindex. Även ett lyssningstest har genomförts och resultaten visar att

taluppfattbarheten har ökats. Lärarens tidtagning visar att uppstartstiden förkortats med

åtminstone 15 minuter per vecka. Sammantaget visar studien att den rumsakustiska åtgärden

inneburit en ökning i nyttjad lektionstid som dessutom blivit mer effektiv genom en uppmätt

ökad taluppfattbarhet. Observerade nyttoeffekter anses väga tyngre än investeringskostnaden

till den grad att installationen rekommenderas till befintliga skolmiljöer och inte bara vid

nyproduktion.

Abstract [en]

This is an interventional study of how classroom acoustics affects a class in regards to time

effectiveness and speech intelligibility. The study compares results of measurements and tests

before and after acoustical treatments in the form of a new acoustic ceiling. The treatments

are made in a classroom in S:t Hansskolan elementary school, with the aim to see whether an

improvement in room acoustics can lead to socio economic gains through an increase in the

effective time for a lesson.

The combined measurements and tests show the state of the acoustical environment before

and after the treatments. Measurements includes the time it takes to get a lesson going, as well

as various acoustical measurements and tests regarding speech intelligibility.

Results shows that the room acoustics have improved with reduced reverberation times, an

increase in early reflexes compared to late, as well as improved speech transmission index

values. The class also scores higher on hearing in noise tests, which implies an increase in

speech intelligibility. The teacher’s timekeeping shows that the time it takes to start classes

has shortened by at least 15 minutes per week. On a whole the study shows that the acoustic

treatments has led to an increase in use of planned time for each lesson, which through

increased speech intelligibility also has become more effective. Observed socio economic

effects outweigh the cost of the installation to the point that it is recommended not only to

new classrooms but also to existing school environments.

Place, publisher, year, edition, pages
2015. , 24 p.
Keyword [en]
Acoustics, Classroom acoustics, Sound environments, Acoustical measures
Keyword [sv]
Akustik, Klassrumsakustik, Ljudmiljö, Rumsakustisk åtgärd, Taluppfattbarhet
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-174028OAI: oai:DiVA.org:kth-174028DiVA: diva2:856819
External cooperation
Ecophon AB
Educational program
Bachelor of Science in Engineering - Constructional Engineering and Design
Supervisors
Examiners
Available from: 2015-09-25 Created: 2015-09-25 Last updated: 2015-09-25Bibliographically approved

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