5. Conclusions

The main acoustic phenomena involved in enclosed ambiences have been presented: acoustic absorption, insulation, and diffusion. A physical explanation of each one has been done, and the main points for their practical application have been summarized.

For the improvement of the acoustic quality of a room, working on its internal surface materials is needed to control the sound absorption (avoiding excessive reverberation) and sound diffusion (avoiding preferred sound paths that generate an inhomogeneous sound field inside).

For controlling the acoustic energy exchange of a room with its external environment, working on the acoustic properties of the boundary enclosure is needed, to reach a reasonable independence from outside and inside acoustic ambiences.
