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Reverberation Time

Reverberation is the result of multiple echoes in indoor spaces, affecting sound clarity, especially in concert halls. It is measured using T60, which indicates the time acoustic energy remains in a room, and optimal reverberation times vary based on room volume and use. For effective speech and music quality, uniform sound absorption across frequencies is crucial, influencing auditorium design and layout.

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7 views14 pages

Reverberation Time

Reverberation is the result of multiple echoes in indoor spaces, affecting sound clarity, especially in concert halls. It is measured using T60, which indicates the time acoustic energy remains in a room, and optimal reverberation times vary based on room volume and use. For effective speech and music quality, uniform sound absorption across frequencies is crucial, influencing auditorium design and layout.

Uploaded by

NIkita
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Reverberation :

•Reverberation refers to the combined efforts of multiple echoes that takes place in
a concert hall or room and is heard by a listener.
•Furthermore, reverberation exists in almost all indoor spaces but does not exist in
most outdoor venues.
•Moreover, if the walls of the room are hard, there would be a repetition of echoes
which may cause the muddling of the sounds.
•The reverberation time of a room shows the duration of the time period for
which acoustic energy remains in a room.
•Reverberation is GOOD to an Extent but NOT LONGER REVERBERATION is
Desired.
•When it comes to precisely measuring reverberation time with a meter, the term
T60 (an acronym for Reverberation Time 60dB) is used.
Reverberation :
Reverberation :
Reverberation :
Reverberation :
Reverberation :
Reverberation :
Reverberation Time Example:

Reverberation Time (Problem):


Calculate the reverberation time at 125Hz, 500Hz, and 2000Hz for a classroom
that is 8m wide by 12m long by 3m high. The floor is vinyl tile on concrete, the
walls are made of 1/2" drywall (gypsum) board, and the ceiling is acoustic tile
suspended in frames.
Reverberation Time Example:
Reverberation Time Example:
Reverberation Time Example-02:
Effect of Reverberation Time (RT) on Speech:

•A range of optimum reverberation times can be broadly defined for rooms on the
basis of their volumes and intended uses.
• A general relationship between reverberation time and good listening effect is
shown in Table 1.
•A fuller or richer quality of sound is obtained in an auditorium where the
reverberation time for lower frequencies is greater than that for the middle and
higher frequencies. This difference in quality is, however, more generally notice-
able with music rather than speech.
Effect of Reverberation Time (RT) on Speech:

•On the other hand, variable sound absorption characteristics, resulting in


reverberation times varying with frequency, can interfere with speech to such
extent that there can be excessive absorption of consonant or vowel sounds.
•Thus it is desirable, for general speech quality, that the absorption coefficients of
the finishes used in acoustic treatment of auditoria should be as uniform as
possible over the frequency range 200-7,000 Hz.

This consideration favours a compact shape of an auditorium with:


(a) A low volume per seat,
(b) A raised platform for the speaker, and
(c) The elimination of any physical obstructions between the speaker and listeners.
Effect of Reverberation Time (RT) on Music:

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