Reverberation Time Calculation Module for NoiseTools

Description

Reverberation Time Calculation Module for NoiseTools

Calculate RT₆₀, RT₃₀ & RT₂₀ in accordance with ISO 3382-2:2008

For some applications, particularly room and building acoustics you may want to determine the Reverberation Time of the space. This is often 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, RT_30, 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.

You can carry out calculations from either a single measurement or 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.

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 Module 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 information 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.