signal processing - Unexpected fundamental hum in audio demonstration -

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i trying create spectral audio demonstration using web audio api's periodicwave generator. can seen here: http://orazdow.github.io/bars/

whenever have fair amount of partials turned on sound dominated loud buzzy hum @ fundamental.

i wasn't expecting , understand cause. hoping generate similar pure data's fourier resynthesis example, can seen here @ section 3.8.2, pure tones rather filtered noise. writing values real part array.

the dominating tone not expected or wanted, hoping understand causing it.

i think oscillators doing what's intended. if have flat spectrum (which have in demo default except it's band-limited), signal should approximately pulse train (periodic signal of impulses).

i think if create such periodic sequence of impulses , listen, sound oscillators.


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