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Audio oscillator and Spectrum

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Audio oscillator and Spectrum

Postby mouren » Wed May 29, 2019 1:06 am


I have just started to dig into the audio chops.

One odd thing I noticed, when I send a sine wave with base frequency 440 hz from the audio oscillator to the audio spectrum for frequency visualization, I get a spike around 10k. My audio spectrum chop is set to Visualizaiton, Freq->Log scaling at 1, Match length to frequency, and I have the viewer display unit set to samples.

In theory, the fundamental should be at 440, no? Is my display setting off or something?

Please let me know.
Thank you.
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Re: Audio oscillator and Spectrum

Postby greg » Tue Jul 23, 2019 11:32 am

If you look at the Info pop-up for that Audio Spectrum CHOP node (MMB on node), it says

Set "Frequency <-> Logarithmic Scaling" to 0, then multiply any sample to 1.000 to get the Frequency at that sample.

I see the spike at sample 440.

Sorry it's documented there... that 1.000 depends on sample rates etc, so it's not a constant.

I added that tip to the wiki page for Audio Spectrum.
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