Use Harmonica index

How to test the Harmonica index?

A Windows program named 'Toots' was developed in order to calculate the Harmonica index. It is licensed free of charge for use by any organisation or person. It can be requested by accepting the terms of the license agreement below (see the "To go further" section) and sending it by e-mail to the address join "@" noiseineu.eu.

The purpose of this licence is to share with the users of the 'Toots' program the shared principles that have been laid down for the use of this new tool: the Harmonica index. In particular, it is forbidden to make commercial profit from the Harmonica index through the resale of the values computed by this index or from any textual or graphical representation of these values. The idea is also to create a community of listed users and to ensure that the users of the index are kept abreast of subsequent developments in the index calculation formula and/or the publication of new versions of the 'Toots' program.



The data must come from a class 1 or class 2 calibrated measurement device or terminal, i.e. one that has been checked beforehand to ascertain that the measurements it performs are correct and that it is used in a context in which measurement uncertainties are acceptable. Step 1.

At least one hour of LAeq (1 second intervals) values are needed, i.e. equivalent sound levels measured using A-weighting. Although it is possible to calculate these values using another indicator such as LFast (1 second) or Lslow (1 second), LZeq (1 second) etc., this is not recommended. Calculations can also be performed using any LAeq data vector sampled at a higher frequency, e.g. an LAeq value over a 500 ms period, an LAeq value over a 100 ms period or an LAeq value measured over a 1/8 second period. In this case, the calculation tool first recreates the LAeq (1 second) using the input data, then calculates the Harmonica index and its sub-indices. However, it is not possible to calculate the Harmonica index using data of a lower frequency, e.g. LAeq over a 2 second, 5 second or 10 second period.

The program can recognise several noise measurement file formats such as certain formats drawn directly from measuring equipment, including the OPE (01dB-ACOEM/Opera), DAT (Rion/NA37) and AZB (Azimut Monitoring) formats. Noise in EU, the body that manages the platform, may add to this list of formats in the future depending on the levels of interest and collaborations established with stakeholders. Data collected in other formats should be converted beforehand to a text format with separators so that they can be integrated by 'Toots'.

'Toots' provides you with an easy way of calculating the Harmonica index using raw measurement data Step 2 then extracting the index values to an Excel file Step 3 or generating graphs Step 4, which can subsequently be cut and pasted into documents.

This allows all users to calculate the Harmonica index themselves using the method developed as part of the Harmonica project and to use the related graphics.

How to distribute the Index results on the Noise In EU platform?

The aim of the Harmonica project is to get as many European cities as possible to distribute their observation data via the Harmonica index. To do so, users wishing to send data from temporary or permanent measurements to the platform should first activate 'demon' mode in 'Toots'.

Next, users must indicate which measurement sites they wish to see in the platform and provide their characteristics in 'Toots' (name, latitude, longitude, purpose of the measurement, possible corrections to the measured levels if the microphone is located on a façade, noise sources, etc.) as well as at least one photo of the measurement site (if possible). Step 5.

The program will periodically check for the presence of new measurement files in the file(s) corresponding to the declared site(s) and will automatically calculate the index and transmit the results to the Noise in EU platform as soon as a new file is uploaded to the site. In this mode, the only data sent to the www.noiseineu.eu site will be the Harmonica index time values and sub-components (BGN and EVT) Step 6. The LAeq (1 second) data will not be transmitted to the server and will be stored locally. 'Toots' can also be used to invalidate data sets in the event that a user realises later on that some data is not representative and needs to be invalidated Step 7.

How to disseminate the Index results on your own website?

The Harmonica index results available on the Noise in EU platform can also be shared by email or on social networks or you can incorporate them directly on your website. To do so, select the measurement site as well as the period for which you would like to see results and click 'Share' at the top left, above the results graphic located under the name of the site. You will need to select your customisation options then cut and paste the HTML link in your email or website. It's extremely simple! Step 8.

You can also add a direct link to www.noiseineu.eu on your website. Step 9.