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1. General
1.1 Sound behaviour in a room
1.1.1 Determinants of the sound field
A sound source placed in a closed space generally radiates in all directions.
Sound waves propagate towards the limits of the volume, coming into contact with walls or obstacles. Their behavior obeys laws that depend mainly on the characteristics of the emitted signal and the impedance of the materials encountered.
The main factors involved in the structure of the radiated field are (figure
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General
Study of the reverberant field in a room
Absorption coefficients of different materials
Room quality assessment criteria
As early as 1900, Sabine implicitly introduced the first criterion of room quality, based on the estimated reverberation time. Today, most authors agree that the acoustic quality of a room can be determined from a minimum of four or five criteria.
Among the most frequently cited are EDT [Early Decay Time: reverberation time calculated over the 0 to – 10 dB interval of the impulse...
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