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T60
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T60

The sound to propagate needs a means; the more common is the air, in which the sound propagates at speed of 343 m/s. (In vacuum it does not propagate).

But when the sound waves hit an obstacle, break down into three elements:

 

When we are in the outdoors (not limited by the sound barriers) the sound, for exemple that of a speaker, reaches the audience directly without any reflections.

However, when we are in the indoors, the sound that invest a wall produces reflections that often disturb the intelligibility of sound. 

1_DIRECT SOUND WAVES 
2_REFLECTED SOUND WAVES

These acoustic reflections on the surfaces create the echo phenomenon. Technically the echo phenomenon is called acoustic reverberation. Not all the acoustic reflections are bad, in fact each indoor has different values of reverberation in function of its use and its volume. 

The unit of measurement of the reverb is the T60 - The conventional reverberation time T60 expresses the time, in seconds, required to obtain a decay of 60 dB of a sound suddenly interrupted.

The reverberation time is the parameter that characterizes unequivocally the acoustics of the indoors and provides guidelines for the creation of the acoustic project.

1) Optimal reverberation time for: concert halls

2) Optimal reverberation time for: churches

3) Optimal reverberation time for: schools

4) Optimal reverberation time for: theatres

5) Optimal reverberation time for: polyfunctional rooms

6) Optimal reverberation time for: television studios

 

The human earing can hear sounds in the range from 20 Hz to 20,000 Hz. This upper limit usually decrease with advancing age, many adults are not able to hear frequencies above 16,000 Hz.

The higher the frequency of a sound is, the sharper it will seems. However, the lower the frequency of a sound is, the graver it will be. The 80% of the human voice, in speech, has frequencies below 500 Hz. 

(The frequency for the male voice is 100-125 Hz, for the female voice is 200-250 Hz and for the child's voice is 400-450 Hz). 

To have a better understanding of the sound's frequencies we could see the table below.

 

 

 

 

 

 

 

 

 

 

 

 

 

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