Speed of Sound with Multiple Mobile-Phone Microphones

版本 1.0.1 (29.2 MB) 作者: Duncan Carlsmith
Live Script illustrating a direct measurement of the speed of sound using multiple mobile phone and similar microphones.
0.0
(0)
8.0 次下载
更新时间 2024/9/21

查看许可证

Introduction
Many physics experiments can be conducted with little more than a mobile phone as instrumentation by leveraging computational data analysis. This educational Live Script shows how to use two audio recording devices (e.g. a laptop, mobile phone, or Airpod™[1] ) and a sound source to measure the speed of sound in air. The sound source and two microphones are first at a fixed location at the beginning of recording. One microphone is then moved a known distance whereupon the sound signal it records is delayed in time and the delay detected. A direct measurement is more intuitive than for example using the frequency of an oscillating air column or observations of the Doppler effect. The two microphone method offers some advantages over measuring echo times as it uses only direct sound.
This script illustrates MATLAB "simultaneous" recording from multiple microphones. The microphones can include any combination of laptop built-in microphones, wired microphones, Bluetooth connected microphones including AirPods™, or an iPhone connected via APPLE proprietary connection. We observe that any two "simultaneously initiated" channels are generally misaligned in time so use the data itself to achieve alignment. This same analysis could be applied to "simultaneous" recordings initiated by other means (voice control programmatically from a script or manually) with the microphone recording transferred via email or cloud automatic synchronization via iCloud for alignment and analysis.
This script may interest instructors and students of physics and related fields. Some "Try this" suggestions and "Challenges" are included for further exploration.

引用格式

Duncan Carlsmith (2024). Speed of Sound with Multiple Mobile-Phone Microphones (https://www.mathworks.com/matlabcentral/fileexchange/172448-speed-of-sound-with-multiple-mobile-phone-microphones), MATLAB Central File Exchange. 检索时间: .

MATLAB 版本兼容性
创建方式 R2024a
兼容任何版本
平台兼容性
Windows macOS Linux

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

SpeedOfSoundWIthMultipleMobilePhoneMicrophones2 folder

版本 已发布 发行说明
1.0.1

Automated look-up of weather and calculation of sound speed.
1.0.0