### to make a calculation of time reverb?

hi comunity! i would like to calculate the reverberation time of my house with max msp. is it possible with max msp and a microphone for example????

If someone know a patch or tutorial please share!! (^_^)

thanxxxx!!!

Hi alersito

When you say ‘house’ do you mean the realworld reverberation times of each room/one room, or the theoretical total reverb time of your entire house? The answers also depend on whether you need a mathematical algorithm for recreating the realworld room, or a system for capturing the rooms’ reverb. If it is the former, you first need a measuring tape. Then you should search for ‘Sabine’s formula’, which states that:

Tr = (Kv)/Se

where ‘Tr’ is total reverb time, ‘v’ is the volume of the room in meters cubed, ‘Se’ is the effective absorbtion area (m2) and ‘K’ is a constant (0.16). ‘Se’ itself is dependent on a number of factors, which can easily be determined if you search for ‘absorbtion coefficient’.

HTH

Brendan

…and here’s an example of how to work out ‘Tr’, based on given room dimensions and materials….

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thankss n00b_meister i want to say the realworld reverberation time. playing a pink noise and then calculating the reverberation time.

OK, I think I understand; by ‘calculate’ you mean ‘capture’, like an impulse response? Sending a short burst of noise into the room via loudspeaker and then capturing the reverberations? Most sources recommend using a 0db burst of white noise for the duration of 1 sample.

The practical application of this is beyond me I’m afraid, but here’s an article I found via google, on convolution reverb, which may or may not help:

http://www.earlevel.com/main/1997/01/19/a-bit-about-reverb/

Brendan

thanks brendan.

i think that could be possible calculate the Tr using a source with pink noise and 100 dB. when the source stop send a bang to a clock and when the level decrease 60dB send another bang and stimate the time between the 2 bangs.

i dont know if this is ok or not. (^_^)