Chapter 4

Room acoustics and means of control

The negative aspects of an isolation shell. Basic wave acoustics. Reflexions. Resonant modes and forced modes. The pressure and velocity components of sound waves. Modal patterns. Flutter echoes. Reverberation. Absorption. The speed of sound in gases and the ratio of the specific heats. Porous absorbers, resonant absorbers and membrane absorbers. Q and damping. Diffusion, diffraction and refraction.

The main means by which we achieve the necessary sound isolation in recording rooms is by reflexion, because absorption, as means of isolation, is rather disastrously inefficient. In typical isolation shells, the sounds produced within the rooms are reflected back from the boundaries, and thus contained ...

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