![]() The recommended reverberation time is always a function of the volume of the room. For broadcasting and recording studios and conference rooms, values under one second are frequently used. Times about 1.5 to 2 seconds are needed for opera theaters and concert halls. The most appropriate reverberation time depends on the use of the room. Reverberation of the room Īfter determining the best dimensions of the room, using the modal density criteria, the next step is to find the correct reverberation time. Other systems to determine correct room ratios have more recently been developed. The curve increases monotonically (each one-third of an octave must have more modes than the preceding one). Ī modal density analysis method using concepts from psychoacoustics, the "Bonello criterion", analyzes the first 48 room modes and plots the number of modes in each one-third of an octave. Finally, oblique modes concern all walls within the simplified rectilinear room. Tangential modes are two-dimensional, and involve four walls bounding the space perpendicular to each other. Axial modes are one-dimensional, and build up between one set of parallel walls. Modes can occur in all three dimensions of a room. P m, n, l ( x, y, z ) = A cos ( m π L x x ) cos ( n π L y y ) cos ( l π L z z ) are coordinates of a point contained inside the room. ![]() Natural modes The pressure of axial modes (top row) and tangential modes (bottom row) plotted for modal numbers (m = 0, 1) and (n = 1, 2, 3) ![]()
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