Combining waves - Schumann resonances

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Combining waves - Schumann resonances

Permanent link to this post Posted by dmonty » Wed Mar 29, 2017 5:45 pm

Working on combining frequencies. Is it best done with (sim [beh1 beh2 ...])? Or with a *table* of harmonics added together?
http://www.cs.cmu.edu/~rbd/doc/nyquist/ ... l#index612
http://www.cs.cmu.edu/~rbd/doc/nyquist/ ... ml#index25

Trying to emulate Schumann Resonances in audacity. These are a set of spectrum peaks in the extremely low frequency (ELF) portion of the Earth's electromagnetic field spectrum.
https://en.wikipedia.org/wiki/Schumann_resonances
https://commons.wikimedia.org/wiki/File ... ectrum.gif
7.83 Hz (fundamental) 14.3, 20.8, 27.3 and 33.8 Hz

Thanks.
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Re: Combining waves - Schumann resonances

Permanent link to this post Posted by steve » Wed Mar 29, 2017 6:30 pm

Difficult to say which is "best" as that depends on what you are doing.
(sim [beh1 beh2 ...]) is possibly easier to understand and use.
build-harmonic would be quite tricky for extreme low (and non-integer) frequencies.

As a simple example, to create a waveform that combines 7.83, 14.1 and 20.3 Hz:
Code: Select all
(mult 0.3
  (sim
    (hzosc 7.83)
    (hzosc 14.1)
    (hzosc 20.3)))
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