Reverberation Time Calculation Module for NoiseTools

Calculate RT60, RT30 & RT20 in accordance with ISO 3382-2:2008 with NoiseTools & the Optimus Sound Level Meters

In many applications, there can be need to determine the Reverberation Time for a space or room. This can be an essential part of the design and installation of performance spaces, teaching rooms or other spaces where the reverberation time impacts upon those using it.

The Reverberation Time (RT) Module is an add-on for the NoiseTools software that allows the calculation of RT60, RT30 and RT20 values from either interrupted or impulse noise source data in accordance with EN ISO 3382-2:2008.

Using measurement data that has been downloaded from a suitable Optimus Sound Level Meter, the module determines if the data is of sufficient quality and where the data is deemed to be suitable, 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 which details all of the calculated parameters.

The graphical and numerical data can be exported for use in other programs or applications as required.

Data is gathered using an Optimus Sound Level Meter that provides 1:1 or 1:3 octave band data with one or more measurements stored in the instrument.


Key Features of the Reverberation Time Module

  • Add-on processing module for the NoiseTools software
  • Calculate RT60, RT30 and RT200 from measurement data using 1:1 & 1:3 octave bands from an Optimus Sound Level Meter
  • Automatic detection of data quality & reliability of the calculations
  • Automatic calculation of measurement uncertainty
  • Overall LAeq, LCeq and LZeq values are supported where 1:1 or 1:3 octave band data is available
  • Supports Interrupted or Impulse noise source data
  • Calculations in accordance with ISO 3382-2:2008
  • Graphical & tabular data with measurement report
  • Average multiple measurements & adjust for multiple sources
  • Compatible with any Optimus Sound Level Meter that provides 1:1 or 1:3 Octave Bands
  • Simple licensing through the Optimus Cloud & NoiseTools software
  • Updates & upgrades delivered automatically through the NoiseTools software

Calculate RT values from Interrupted or Impulsive noise sources

The module can process data that has been gathered using either an interrupted noise source, such as a loudspeaker, or an impulsive noise source, such as a balloon or pistol.

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 3382-2:2008.

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.


Simple to use with clear, informative reports

The Reverberation Time Modules presents the calculated values as a detailed table which shows, for each band:

  • Source (dB) - This shows the level, in dB, of the specific band at the start of the decay
  • Background (dB) - This shows the level, in dB, of the background in the specific band
  • T20 (s) - The calculated T20 value in seconds
  • T30 (s) - The calculated T30 value in seconds
  • T60(20) (s) - The calculated T60 from the T20 value, in seconds
  • T60(30) (s) - The calculated T60 from the T30 value, in seconds
  • T20 Uncertainty (s) - The calculated uncertainty of the calculated T20 value
  • T30 Uncertainty (s) - The calculated uncertainty of the calculated T30 value
  • Reliable T20 - A Yes/No indication of reliability of the calculated T20 value
  • Reliable T30 - A Yes/No indication of reliability of the calculated T30 value

All of the inforamtion presented in this table can be exported directly as a CSV or XML file for use in other programs or for further analysis.

A pre-formatted report is also available which shows all of the calculated values in both tabular and graphical formats.


Ordering Information

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


The Reverberation Time Module supports data from the following instruments

  • Optimus Green Sound Level Meters
    • CR:171A Class 1 Optimus Green Sound Level Meter
    • CR:171B Class 1 Optimus Green Sound Level Meter
    • CR:171C Class 1 Optimus Green Sound Level Meter
    • CR:172A Class 2 Optimus Green Sound Level Meter
    • CR:172B Class 2 Optimus Green Sound Level Meter
    • CR:172C Class 2 Optimus Green Sound Level Meter
  • Optimus Red Sound Level Meters
    • CR:161C Class 1 Optimus Red Sound Level Meter
    • CR:161D Class 1 Optimus Red Sound Level Meter
    • CR:162C Class 2 Optimus Red Sound Level Meter
    • CR:162D Class 2 Optimus Red Sound Level Meter

NoiseTools. Saving You Time & Money

As with all Cirrus sound level meter and doseBadge software, the standard version of the NoiseTools software is supplied free from any licensing restrictions and can be installed on as many PC's as is needed without the need to purchases any additional licenses, seats or keys.

Updates can be downloaded free of charge from the Cirrus website. Where access rights permit, NoiseTools can automatically download and installed updates when they become available.

Detailed installation information and guidance is available to help in the installation process. If NoiseTools is to be used in a networked environment or where data is to be shared between multiple users, NoiseTools can be setup to support these requirements.

  • License-Free with no installation restrictions
  • Install NoiseTools on to as many PC's at no extra cost
  • Download the latest version, free of charge, from the Cirrus website
  • Simple deployment for multiple users with detailed documentation for Admins

Additional modules, such as the Reverberation Time Module, can be added to the standard program. Please note that there may be a charge for this additional modules. Please contact Cirrus Research plc or your local Cirrus Sales Partner for more information.


Product Information

Product Datasheets

User Manuals


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