Calibration of Mobile Noise Level Meter

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Dr. Márki Ferenc
Department of Networked Systems and Services

The Hungarian Academy of Sciences (Magyar Tudományos Akadémia) has launched a project in 2014 named Protect your ears (Óvd a füled). The campaign’s purpose is to take steps in favour of protecting the hearing of next generations.

There are initiatives for surveying the present conditions in Hungary as accurately as possible by noise level measurements at different events and hearing examinations. Beside these development of community noise meter applications has started for mobile phones. By using these apps the users themselves can inquire about the event’s momentary effect on hearing. Like that these mobile applications can improve the hearing-protection of adults and their children alike. Further aim of these apps is statistical data gathering.

As the use of mobile noise level meter confronts us real time with the momentary effects on hearing, it can make the user aware of hearing-protection.

This degree thesis connects to the initiatives of MTA and demonstrates a solution which makes a mobile phone suitable for noise level measurement by calibration, or filters out the unsuitable types.

In chapter 2 (Survey of customs concerning music consumption and hearing impairment) a statistical survey is described made within the framework of this project. It studies the noise load of present generations and the effects it causes. The survey’s outcome also supports the importance of propagating hearing protection.

After that a complete solution is shown for calibrating a mobile phone intended to be used as a noise level meter. The arrangement needed for the measurement and the calibrating software is described. The software itself is also attached to the thesis.

Finally the measurement results and further possibilities for future development are presented.


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