Hi Suren,
These are aliased harmonics. Say you start with a pure sine wave, which
corresponds to a single spike in the frequency domain. When you convert
it into a square wave, you generate harmonics that extend to very high
frequency- far beyond one-half of the sampling rate. These harmonics
therefore become aliased to a lower frequency.
Regards,
Steve
Steve.Smith1@xxxxxxxxxxxxxxx
.
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