Octave & Third-Octave Band Ln Calculation Module for NoiseTools

The Octave & Third-Octave Band Ln Calculation Module is an add-on for the NoiseTools software that allows for the calculation of Ln values, such as L10, L50 & L90, in 1:1 and 1:3 Octave Bands.

This allows, for example, L90 values in 1:3 octave bands from 100Hz to 5kHz to be calculated and used to assess the tonal content of a noise measurement.

Using time history data that has been downloaded from a suitable Optimus Red or Optimus Green Sound Level Meter, the module processes this information using the same statistical method used in the Optimus Green Sound Level Meters.

The module allows the calculations to be run on a pre-defined list of commonly used Ln values (L1, L5, L10, L50, L90, L95 & L99) and additional, user defined values can be added if required.

In addition, dB(A) or dB(C) can be applied to the calculations (the default configuration uses applies no frequency weighting to the calculations).

Alongside the calculated Ln values in each band, the module can also display the overall Leq for each frequency band as well as the value of the highest sample used within each frequency band.

In addition, the overall broadband Leq (A, C or Z weighted) and LFmax (A, C or Z weighted) values can be displayed for reference and comparison purposes.

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.


Features of the Module

  • Add-on processing module for the NoiseTools software
  • Calculate Ln values in 1:1 or 1:3 Octave Bands*1
  • Process commonly used Ln values (L1, L5, L10, L50, L90, L95, L99) & add user-defined Ln values
  • Choose from Unweighted, dB(A) or dB(C) frequency weightings to give Ln, LAn or LCn values in each frequency band
  • Calculate the overall Leq for each frequency band
  • Display the highest sample for each frequency band
  • Display the overall broadband Leq & LFmax
  • Calculate values from single measurements or grouped measurements
  • View the calculated values in graphics & tabular formats
  • Quickly export graphs & tables for use in other applications
  • Create measurement reports with print & export options

Export data & create measurement reports

The module allows a measurement report to be quickly generated which contains both the graphical and tabular data in a clear, straight forward layout.

This report can be saved, printed or exported in a range of formats, allowing it to be incorporated into other reports or documents quickly and easily.

The graphical display can be saved as an image and the tabular data exported as either a CSV or XML file for use in other applications.


Ordering Information

The Octave & Third-Octave Band Ln Calculation Module can be ordered using the product code SWNR-LN.

For more information, please contact Cirrus Research or your local Cirrus Sales Partner.


The Octave & Third-Octave Band Ln Calculation 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 Octave & Third-Octave Band Ln Calculation 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


Would you like more information about the Module or the NoiseTools software?

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