Architectural acoustics aims at providing spaces in which the auditory comfort of the occupants is taken into account as a fundamental component of the quality of many buildings.

As their reason for being is to offer optimal conditions for speech, singing and / or music, performance halls, e.g. theaters, concert halls and screening rooms, cabarets, operas, auditoriums, but also dance halls and discotheques are often the object of studies in architectural acoustics (when they are not bars or pubs, which are periodically concerned too).

The limitation of the sound transmission is often an important problem to consider inside such buildings e.g. in the case of adjacent projection rooms (so as to keep to each room the soundscape specific to a film that the viewer has chosen, without the sound pollution that would be related to the diffusion of another soundtrack in a neighboring room) or vis-à-vis the outside e.g. in the case of the noise limitation of establishments broadcasting amplified music.

In addition, the control of the reverberation of such premises is always a major issue when it comes to optimizing the acoustic environment resulting from the presence of one or more sound source(s), the conditions of propagation of sounds and listeners.

The reverberation time (duration) is often a fundamental indicator of their acoustic quality (when it comes to premises for music, for conferences or teaching or to sports halls) and is therefore limited according to the destination of the space i.e. according to the activities that take place there (in relation with word, song and music, instrumental or not).

For spaces with the most demanding acoustics requirements, more specific performance indicators are used e.g. 50 or 80 ms (C50, C80) clarity, early decay time EDT (Early Decay Time), STI standard intelligibility criterion, central time TS , definition D50, sound strength G, lateral efficiency (LF and LFC).

ITS has computational means for predicting those performance indicators for architectural acoustics of such spaces.

For other premises, taking into account the more or less specific noise limitation and acoustic comfort requirements related to the occupants' length of stay and their activities, the ratio of the equivalent absorption area to the volume may be the subject of a project specification (e.g. with reference to a non-mandatory application standard) in relation to the group of spaces to be considered (according to the classification of this standard).

ITS can also carry out an engineering mission in architectural acoustics for such premises.

In addition, the decrease in the noise level by doubling the distance to the source (spatial sound decay rate) may in some cases be a relevant indicator of the acoustic quality of premises such as offices (individual, collective, or open spaces) and associated spaces (meeting rooms, relaxation areas, restaurants) or other work areas such as workshops and production halls.

ITS can also use its prediction tools for architectural acoustics for such premises, in order to verify their compliance with the reference texts, and if necessary, to develop technical solutions allowing their habitability to be improved with respect to all the considerations related to soundproofing.