In my thesis, I first described the concepts of sound and noise in the context of noise pollution.
I presented definitions of measurement methods and standards for limiting noise for safety at
work. I described the piezoelectric effect and comparative measurements with a special device
for these measurements and with the device in the telephone.
Then the compared measuring devices are described: a measuring device with a microphone in
a Samsung A32 phone and a Bruel & Kjaer phonometer that I borrowed from the Faculty of
Maritime Studies and Transport in Portorož.
The measurements on the Delfino Verde Gold I made only with my phone. The other
measurements on the motor boats Castor 2 and Chiara were made simultaneously with both
devices. Each measurement took 5 minutes.
After the measurements, the data were processed and compared. The aim of the comparison
was to determine the quality of the nonprofessional instrument in the phone compared to the
professional phonometer and to identify appropriate procedures to reduce the differences
between the results of the two instruments. The most important procedure for correct
measurements is the expected correct calibration of the phone.
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