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- Title
The Smartphone as a Sound Level Meter: Visualizing Acoustical Beats.
- Authors
Salinas, I.; Giménez, M. H.; Castro-Palacio, J. C.; Gómez-Tejedor, J. A.; Monsoriu, J. A.
- Abstract
Acoustics is a topic in first year Physics courses for engineering students. In this respect, we present in this work a simple experiment to study acoustic beat phenomenon. The superposition of sound waves of slightly different frequencies is captured with the microphone of a smartphone which is placed equidistantly from two speakers which are connected at the same time to AC generators. The smartphone is used here as a measuring instrument. Data registered from the sound level versus time were collected and exported to a «.csv» file for further analysis by means of a free Android application. Based on these data and applying a simple graphing analysis the frequency of the beat was determined and compared with the frequency difference set at the AC generators. Percentage discrepancies within 1% were obtained. This indicates the efficacy of the method used.
- Subjects
ACOUSTICS; SMARTPHONES; SOUND waves; ENGINEERING students; ACOUSTIC generators; PHYSICS education
- Publication
Técnica Industrial: Revista Cuatrimestral de Ingeniería, Industria e Innovación, 2017, Issue 318, p34
- ISSN
0040-1838
- Publication type
Article
- DOI
10.23800/9948