STME58
543 posts
Sep 18, 2013
5:26 PM
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Here is a way you can quantize tone. You can use this to get an objective measure of the difference between sounds recorded in a .wav file. This will plot the sound wave form, then let you select an area of the sound to calculate the harmonics. Try lip block vs tongue block, wood comb vs plastic comb, tight cup vs loose cup, or trombone vs kazoo!
This will show you the difference between the sounds by showing you the overtones and how strong each is. (It won't tell you if you really only changed one variable or not, so there will still be plenty to argue about!)
I have created a MATLAB R2012a executable file that will work on .wav files. This file does not require you to have MATLAB. But you will need a way to record a .wav file. I
used the default sound recorder in windows and an online converter to change it from a .wma to .wav
Matlab Executable file
In order to run this you will need a free compiler from MATLAB. Select the one for your computer and MATLAB R2012a here.
Matlab compiler downloads
Once you have the complier and the executable on your machine. Double click the executable file from your browser. It will take a while but eventually a dialog box will come up asking you to select the .wav file you want to analyze. Load the file you want just like you are loading a file into your word processor. After you select the file, Matlab will plot the waveform. It will look like the forms you see in Audacity or other recording programs. A cursor will show up on the plot. Click on the beginning and end of the section you want to analyse and MATLAB will calculate and plot the sound pressure level for frequencies up to 20kHz. A dialog box will then come up asking you if you want to analyze another area of the plot. The MATLAB plot boxes have tools at the top to allow you to zoom in and out , ask for the value of a particular point or print or copy the graph. Hopefully some of you will try this and post your findings.
Thirty years ago you would have had to spend tens of thousands of dollars for a spectrum analyzer to get this capability. Now you can do it on a PC most of us already have.
Here are a couple of .wav files I recorded that you can use to try out the program.
Suzuki Promaster Blow and overblow
Suzuki Promaster Bb scale
Last Edited by STME58 on Sep 18, 2013 6:07 PM
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