This demo illustrates that (nearly) sinusoidal signals
can be produced by other simple physical systems.
In this case, we use a simple clay whistle which
can be modeled as a an "acoustic tube" or a closed-end pipe.
The objective of the demo is to listen to the
sounds of two different clay whistles and then compute the frequencies
of the sinusoids from a plot.
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CLAY WHISTLE: BLUE-BIRD
This clay whistle emits a nearly sinusoidal signal when you blow it. Can you determine the frequency of the sinusoidal signal that is produced by the whistle? |
SOUND |
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CLAY WHISTLE: CAT
This clay whistle also emits a nearly sinusoidal signal when you blow it. The frequency should sound higher. Once again, you should determine the frequency of the sinusoid (see the plots below). |
SOUND |
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McClellan, Schafer, and Yoder, Signal Processing First, ISBN 0-13-065562-7.
Prentice Hall, Upper Saddle River, NJ 07458.
© 2010 Pearson Education, Inc.