Titch%20and%20Tim's%20Didj%20Gig.%20Summer%20Solstice%20eve.
With appreciation and love for the native Australian people, who gave the world the Yidaki (Didjeridu)
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Didjeridu or Yidaki

Why it works

From the physicists perspective the Didjeridu is an excellent example of an instrument that depends on the standing waves of a cylindrical tube closed at one end. The simple theory of such a system, predicts that the frequency spectrum will consist of only odd harmonics and that the fundamental or first harmonic frequency is related to the length of the hollow tube by the relationship V/4L where V is the speed of sound (about 340 m/s) and L is the length of the tube.

To test this relationship a digital recording of a long sustained note with the Didjeridu was made, and Fourier transformed the resulting time-domain signal to obtain the frequency spectrum shown in the figure below. The recording was made using a PC sound card, the Fourier transformation was performed by importing the sound file into MATLAB.

Fourier%20spectrum%20of%20a%20Didgeridu%20tone
The length of the Didjeridu tube was 131 cms which , using the formula above, predicts a fundamental frequency of 65 Hz. As one can judge by the figure this theoretical value agrees with the experiment. One can barely see a small peak at about 130 Hz where the second harmonic should be and then a much stronger third harmonic. The trend continues with all even harmonics suppressed and only odd harmonics present, past the ninth harmonic.

Links

Glastonbury Tor
Hand made, English wood, Didjeridus, ethically sourced from fallen trees: anticearthworks.co.uk
Some of our information is from ididj.com.au
Traditional Arnhem Land Didjeridu music: manikay.com
More about 'why it works': In-depth study
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