Lab 6 – pg 1
Physics 123
Identification Number _________________
Lab #6
Fourier Transforms
In this lab you will study the relationship between time dependent signals and their frequency
spectrum (i.e., their Fourier transform). You will do this using a computer program which can
generate or record waveforms or readin prerecorded waveforms. This program will display the
waveform along with its Fourier transform.
The first step is to go to the class website and click the “Lab 6  Fourier transforms” link. You
can run the applet and get additional help there. The next thing to do is to play with the program
and make sure that you understand how to use it. In particular, make sure you understand how to
zoom in and out on the graphs, and how to find the exact value of a point by rightclicking on it.
Musical Octaves
. Click on “RESET ALL”. This will set up the program to work with a “user
defined” waveform and set the waveform equal to
sin(2*pi*440*t)
. This will generate a sine
wave at 440 Hz (the A above middle C). Now, adjust the frequency (the 440) until you hear a
tone which is one octave higher. Note the frequency below. Adjust the frequency again until the
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 Winter '09
 Physics, Square wave, Sine wave, Waveform, Δω Δt

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