Archive site for Autodesk Ecotect Analysis educational resources, notes and tutorials

Reverberation Time

Reverberation Formula

last updated 24 September 2007

Sabine and Reverberation Time

W C Sabine.
W C Sabine.
Wallace Clement Sabine is widely considered to be the founder of modern architectural acoustics. As a young faculty member of the Harvard University Physics Department, in 1895 Sabine was given the task of improving the acoustic performance of the lecture hall in the Fogg Art Museum. At that point, the acoustics of the lecture theatre were considered so awful that other faculty members believed it would be an impossible task.

Ecotect Tutorial: Statistical Reverb Time Graphs

last updated 23 March 2008


This Ecotect tutorial demonstrates step by step how to display and interpret information contained on a Statistical Reverberation Time graph.


You will need about 20 minutes to complete this tutorial.

Training and Accreditation

Successfully completing this tutorial fulfills one of the practical skills required for completing Level 1 of the Acoustic Design training module.

Resources Required

To complete this tutorial, you will need the example file. This is contained in the 'Examples' folder located in the folder where Ecotect is installed on your computer.

Reverberation Time

last updated 1 August 2007

The Growth and Decay of Sound

When a source begins generating sound within a room, the sound intensity measured at a particular point will increase suddenly with the arrival of the direct sound and will continue to increase in a series of small increments as indirect reflections arrive and act to contribute to the total sound level. Eventually an equilibrium is reached where the sound energy absorbed by the room surfaces is equal to the energy being radiated by the source. This equilibrium is usually found quite quickly because the absorption of most building materials is proportional to sound intensity. Thus, as sound levels increase, so too does their absorption.


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