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ISO3382 Impulse Method


The ISO3382 Impulse Method block determines the reverberation time based on calculations from ISO 3382-2:2008 Measurement of room acoustic parameters โ€” Part 2: Reverberation time in ordinary rooms.

The reverberation time is calculated based on the impulse method where an impulse e.g a clap, balloon, gun is used, or an impulse generated using a sine sweep is used. The impulse is converted to a decay curve where a linear fit is found and the reverberation time T60, T30, or T20 is calculated.

MxNFx1Fx1Fx1Impulse [P,pos1]Reverberation timesLinefit Non linearityBand SNR


Impulse [P,pos1] is the impulse response that is M samples long, in a single position repeated 1 to N times. Multiple inputs will be ensemble average together.


Reverberation times is the calculated reverberation times in F bands. Default one band pr octave from 100 Hz to 4000 Hz.


Bands pr. octaveโ˜ 1
Start frequencyโ˜ 100
Stop frequencyโ˜ 4000

Values with โ˜ can receive external input.


Name specifies the name of the block.


Mode specifies which type of reverberation time you want to calculate. You can choose between T60, T30, or T20.

Bands pr. octave#

Bands pr. octave species the number of bands you want to output pr octave.

Start frequency#

Start frequency specifies the frequency which should be in the first band.

Stop frequency#

Stop frequency specifies the frequency which should be in the last band.


Inputs specifies the number of inputs the block requires. A single measurement position is needed. As inputs is increases you increase the number of measurement positions that are used.