Dr Andrew French P5/6 Winchester College

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Presentation transcript:

Dr Andrew French P5/6 Winchester College Post-IGCSE Physics Course: Experimental Physics using Data Loggers and Computers 12 Spectrogram (Waves) Dr Andrew French P5/6 Winchester College Last updated April/May 2017

Experimental setup USB microphone input box Microphone Various sound sources (tuning forks, balloon, bell, boxes, raspy card water column in measuring cylinder, tuned strings ...) Windows PC running SoundAnalyser MATLAB application

Gain dial USB microphone input box. Make sure 48V ‘Phantom power’ button is pressed.

Various sound sources

Tuned strings sound source

Tuning forks

Various sound sources Discs for spinning!

Configure windows Sounds settings to be Speakers for playback ...

Configure windows Sounds settings to be Line In for recording ...

Run MATLAB and run SoundAnalyser.m within the MATLAB command window. The following GUI will appear. This result is for the bell – which has distinct harmonics Pressing Record will record sound and then analyse it i.e. amplitude vs time and frequency spectrum vs time (plus ‘dominant’ frequency vs time) graphs will be generated.

Violin A 440Hz

Guitar A 440Hz

Piano A 220Hz

Recorder A 880Hz

Flute A 440Hz