Smartphone-based sound level measurement apps: Evaluation of directional response. (1st January 2021)

• Record Type: Journal Article
• Authors: Celestina, Metod; Kardous, Chucri A.; Trost, Andrej
• Is Part Of: Applied acoustics. Volume 171(2020)
• Publication Date: 2021-01-01
• Subjects: App -- Sound level meter -- Compliance; Acoustical engineering -- Periodicals; Periodicals; 620.2
• DOI: 10.1016/j.apacoust.2020.107673
• Languages: English
• ISSNs: 0003-682X

Abstract

Abstract: Smartphones have evolved into powerful devices with computing capabilities that rival the power of personal computers. Any smartphone can now be turned into a sound-measuring device because of its built-in microphone. Many sound measuring apps exist on the market for various mobile platforms. In our earlier research, we showed that a smart device with an adequate app can achieve compliance with most of the Class 2 requirements for periodic testing. In this paper, we present the methods and results of measuring directional response of a sound level meter consisting of a smartphone and one commercially available sound level meter app in the horizontal plane. We used both the built-in smartphone microphone and an external microphone according to relevant IEC [International Electrotechnical Commission] and ANSI [American National Standards Institute] sound level meter standards. The results show that the sound level meter app and an external microphone can achieve compliance with the requirements for Class 2 of IEC 61672/ANSI S1.4–2014 standard in the horizontal plane.