Overview
ABSTRACT
Room acoustics is a discipline which requires the implementation of multiple areas of knowledge, by a number of condition variables on a given configuration. This article provides a detailed and systematic approach. After an advanced study on possible difficulties (major defects, coupling, etc.) as well as the calculation of the duration of reverberation and sound levels, the article moves on to the systematic measurement phase before returning to the core issue which is modeling. The fourth phase includes the accomplishments of the project making comparison between the prevision and the actual values and validation of the models. The final phase looks at the opportunities of publishing the results.
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Read the articleAUTHOR
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Jacques JOUHANEAU: Professor, former holder of the CNAM Acoustics Chair
INTRODUCTION
Room acoustics is a discipline that requires a wealth of knowledge in a wide variety of fields. The number of variables conditioning a given configuration is considerable. It is therefore important to prioritize them and select the most relevant for a given purpose. This remark is all the more justified in that the models involved are numerous and, most of the time, incompatible.
The major difficulty with this discipline is that no physical model can describe or predict the behavior of a sound wave in an enclosed space (see
This deficiency can only be compensated for by bringing into play a myriad of formulas, sometimes geometric, sometimes undulatory, sometimes statistical, sometimes psychophysical, sometimes analogical, sometimes empirical...
The "connection" of these formulas is an operation whose complexity is only suspected by specialists. As a result, the only way to be operational in adapting a room to a given purpose is to know all the laws relating to architectural acoustics, and to master their choice and implementation. It is the role of methodology to enable the acquisition and implementation of this mastery.
With this in mind, three methods will be proposed: the systematic approach [BR 1 010], the model-based approach
The systematic approach [BR 1 010] consists in listing, in chronological order, all the steps required to characterize a room. This is the approach required of any acoustical engineer tasked with optimizing a room for a given purpose: listening, insulation, soundproofing, comfort, etc.
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