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Monday, July 8 • 17:30 - 17:50

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Acoustic comfort is a very important feature when designing a room used by many people such as a gymnasium, a concert hall, a conference room or an office. It is mainly related to reverberation time and other characteristics of the room. Building and construction stakeholders (architects, contractor, designers, developers, etc.) usually work with acoustic consultants to optimize room acoustics. However, they do not have a simple decision support tool, which provides both guidance and recommendations to make preliminary decisions regarding acoustics, therefore saving time and money. A smartphone application (ClapReverb) was designed to measure and compute reverberation time in the medium range frequency domain. The user needs to produce a few handclaps while following instructions on the screen. This method does not require additional hardware because the sound is recorded using the inboard microphone of the smartphone. The upcoming results provide the room's reverberation time and recommendations on acoustic comfort. Thus, two main concerns were addressed in this study: 1) defining the range of validity of the measurement through handclaps and the smartphone microphone, 2) developing an ergonomic application useful for building and construction stakeholders. A parametric study has been conducted to develop a robust process to measure reverberation time and to define the range of validity of the measurement in terms of frequency, reverberation time error, room volume, ambient noise, handclap type, etc. Measurements were compared to a reference method, which was wooden clapping device impulses recorded with a class-1 microphone and analyzed with a Scilab analysis program that complied with ISO-3382 Standard. Overall reverberation time results showed a mean absolute error of 0.09 s computed by ClapReverb (mean relative error of 6.0 %). ClapReverb provides reliable results with ambient noise up to 60 dBA, and is therefore a promising easy-to-use smartphone application which democratizes acoustics and helps stakeholders to optimize room acoustics.


Lars Håkansson

professor, Linnaeus University

Triantafillos Koukoulas

Dr, Korea Research Institute of Standards and Science


Monday July 8, 2019 17:30 - 17:50 EDT
Westmount 2
  T01 Ac. meas. & instrum., RS02 Measur techniq & sens