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The Department of Engineering Systems - Acoustics Group
Room Acoustic Computer Models written in Javascript
Reverberation Time Formula Based on the Sabine formula for sound decay in a room by Dr Stephen Dance
Hodgson Model Based on the Hodgson empirically derived model to predict sound levels in industrial rooms,
Hereema Model Based on the Hereema and Hodgson empirically derived model to predict sound levels and reverberation time in industrial rooms
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
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
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.


Page updated by Stephen Dance
18 July 2009

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