Evaluation of smartphone sound measurement applications
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Evaluation of smartphone sound measurement applications

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    This report describes a pilot study to assess the functionality and accuracy of smartphone sound measurement applications (apps) and examines whether such mobile applications can be appropriately employed for occupational noise measurements. Testing was conducted in a reverberant acoustic chamber using pink noise at levels of 65-95 dB. A representative sample of smartphones and tablets on various platforms were acquired, more than 130 iOS applications were evaluated but only 10 apps met our selection criteria for functionality, measurement metrics, and calibration capability. Only 4 out of 62 Android apps partially met our selection criteria and were tested. None of the Windows-based mobile applications met our selection criteria. The results showed two iOS apps with mean differences of 0.07 dB (unweighted) and -0.52 dB (A-weighted) from the reference values. Two other iOS apps had mean differences within +/- 2dB. The Android-based apps lacked the features and functionalities found in iOS apps and showed a wide variance between the same app measurements on different devices. Overall, the study suggests that certain apps may be appropriate for use in occupational noise measurements. NIOSHTIC no 20044048
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