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ISO3382 Impulse Method

Description#

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

Input#

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.

Output#

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

Attributes#

AttributeValue
NameISO3382ImpulseMethod
ModeT30
Bands pr. octaveโ˜ 1
Start frequencyโ˜ 100
Stop frequencyโ˜ 4000
Inputs2

Values with โ˜ can receive external input.

Name#

Name specifies the name of the block.

Mode#

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#

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.

Literature#