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Reverberation Time Formula |
Based on the Sabine formula
for sound decay in a room by Dr Stephen Dance |
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Hodgson Model |
Based on the Hodgson
empirically derived model to predict sound levels in industrial rooms,
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Hereema Model |
Based on the Hereema and
Hodgson empirically derived model to predict sound levels and reverberation
time in industrial rooms |
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CISM Web Model |
Developed from Dr Stephen
Dance's PhD, a simple geometric model CISM, for predicting sound pressure
level, early decay time and reverberation time (RT15) and speech
intelligibility (STI) in rooms. Runs best in Opera Browser RT only
accurate if absorption > 0.2 |
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Speech Intelligibility in Quasi-Diffuse Rooms |
Developed from research undertaken with telent
plc, on speech intelligibility in acoustically hard rooms with multiple
loudspeakers. Using the Sabine formula and assuming the spacing of the
speakers is approximately equal to the shorter room dimension creates a
pseudo diffuse sound field. The signal to noise ratio is assumed to be at
least 15 dB across the frequency range |
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Absorption Calculation |
The absorption coefficient of
a sample of material can be determined from undertaking two reverberation
time measurements in a reverberation chamber using the Sabine formula.
However, this can result in coefficients greater than one, this can be
avoided by application of the Eyring-Norris formulae. |
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