The ocarina is a very unique instrument; because of its shape, it is able to generate a very pure tone. I recorded the waveform of the note of an ocarina, and compared it to a couple of other sources in order to verify this.
The first sound recorded was a clap:
This wave shape is extremely far from pure due to its lack of uniformity.
I then recorded a tuning fork:
Compared to the clap, this waveform is much more pure and is clearly sinusoidal.
Lastly, I recorded an ocarina (Twelve hole alto playing a low C):
As you can see, the wave produced by the ocarina is even more pure than that of the tuning fork by a noticeable margin. The claim that an ocarina can produce a nearly perfect tone is certainly valid!
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