www.cirrusresearch.co.uk

Acoustic House, Bridlington Road, Hunmanby, North Yorkshire YO14 0PH, United Kingdom

T: +44 1723 891655 E: sales@cirrusresearch.co.uk

Features

• Add-on processing module for the NoiseTools

software

• Calculation of RT60

, RT30

& RT20

from

measurement data using 1:1 & 1:3 octave bands

from an Optimus Sound Level Meter

• Supports Interrupted or Impulse noise source data

• Calculations in accordance with ISO 3382-2:2008

• Graphical & tabular data with measurement report

• Automatic detection of data quality & reliability of

the calculations

• Automatic calculation of measurement

uncertainty

• Average multiple measurements & adjust for

multiple sources

Overview

The Reverberation Time Module is an add-on for the

NoiseTools software that allows the calculation of RT20

,

RT30

and RT60

values from either interrupted or impulse

noise source data in accordance with EN ISO 3382-

2:20081.

Measurements can be made using either an interrupted

or impulse noise source and measured using an Optimus

Sound Level Meter.

The measured data is downloaded into the NoiseTools

software where the module calculates the required

values in accordance with EN ISO 3382-2:2008.

The calculations can be carried out using either a

single measurement or from a group of measurements,

allowing multiple samples to be combined, reducing

the measurement uncertainty.

Where multiple measurements are used, the module

will automatically calculate the average values across

all suitable data.

The calculated values are displayed both in graphical

and numerical form and a report can be produced.

The graphical and numerical data can be exported for

use in other programs or applications as required.

Reverberation Time Calculation Module for NoiseToolsCalculations in accordance with ISO 3382-2:2008

www.cirrusresearch.co.uk

Acoustic House, Bridlington Road, Hunmanby, North Yorkshire, YO14 0PH, United Kingdom

T: +44 1723 891655 E: sales@cirrusresearch.co.uk

RT Module Overview Sheet R2 EN

Supported Data Types

The module uses any suitable measurement from an Optimus where the time history sample rate is set to 62.5ms for

1:1 and 1:3 octave band data. 10ms sample data for LAeq, LCeq and LZeq is also supported where 1:1 or 1:3 octave

band data is also available.

The module will determine if the data is of sufficient quality to accurately calculate the RT20

and RT30

values according

to EN ISO 3382-2:20081. To calculate the reliability of the data source, the module uses BT>4 for impulse noise

sources and BT>16 for interrupted noise sources as defined in EN ISO 3382-2:2008.

The uncertainty of the measurement calculations is also calculated automatically and provided in the table and

measurement report.

Licensing & System Requirements

NoiseTools uses a licensing system that requires an Optimus Cloud account to be created and connected to the

NoiseTools installation. The module will be licensed to that Optimus Cloud account.

The module requires NoiseTools version 1.8 or later to be installed. The latest version of the NoiseTools software can

be downloaded from www.cirrusresearch.co.uk/library/software

Installation and operating instructions can be downloaded from the Cirrus Research website at www.cirrusresearch.

co.uk/library/manuals

Ordering Information

The NoiseTools Reverberation Time Module can be ordered using the product code SWNT-RT

1. EN ISO 3382-2 Acoustics - Measurement of room acoustic parameters - Part 2: Reverberation time in ordinary rooms (ISO 3382-2:2008)