Psychoacoustic Audio Perception
Cluster focuses on psychoacoustic effects like missing fundamental, beat frequencies, harmonics, phase alignment, and spectrum analysis explaining why people perceive sounds as dissonant, consonant, or indistinguishable in audio demos.
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That has a lot of overtones. If this is truly based on some weird psycho-acoustic effect, a piano tone might not work.
If I understand correctly, it's because the frequency it is listening to is much higher than normal music. Also possibly because the algorithm is meant to deal with noise.
Get an audio spectrum analyzer app for your phone, and enable its log-X scale. Very useful for this sort of thing. The FFT will reveal sounds you don't hear yourself.
You are probably observing the missing fundamental phenomenon: https://en.wikipedia.org/wiki/Missing_fundamental
Why haven't they attempted to visualize the audio? Side-by-side FFT comparisons would show any differences pretty quickly
Same, there is a weird sine wave with high pitch and frequency.
Interesting, I still hear it the same, dissonant and consonant, perhaps western music ruined me. Thanks for sharing.Edit: Didn't see the url, makes my old reply obsolete:Interesting. I tried to avoid clipping/aliasing by using audacity with as high quality audio as my system allows and I can still reproduce pretty much exactly what you hear on those websites. https://vocaroo.com/i/
It's widely claimed, but most folks can't hear it because the rhythm is totally wrong. Listen to high low freq shifts instead.
Maybe it has something to do with phase. If they are ever so slightly out of tune, the phase is kind of "smeared" out, whereas with "exactly in tune" the locked phase can affect the timbre.
Sounds like you were generating a beat frequency, pretty neat :)https://en.wikipedia.org/wiki/Beat_(acoustics)