Physics: Beats Detection ("Square" Waves)

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ZdrytchX -{Reference

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Published on July 19, 2013 3:00:27 PM ● Video Link: https://www.youtube.com/watch?v=LDmr9jr9VOw

Duration: 2:08

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This is just a demonstration to back up my arguement long time ago which kinda ended, that beats ARE audible to normal people beyond 6Hz. I wonder how that number came up, the internet shows 20-30Hz, which is basically what I got here as well.

It is up to you to think where you think the beats stop. Of course, this depends on your brain's state, if you're sleepy then the beats will be incomprehensible earlier.
Note played is middle C, which I think it is ~258-ish Hz. The wave form I am playing is actually a 25% square/rectangle/pulse wave (25% of the wave length is up, the rest is down). At the start the two channels aren't actually synced completly, they're off by about 0.1 wavelengths or so. The program used is FamiTracker, and the program used to display the waveform is VLC (shows stereo although I'm playing a mono sound, the top and bottom wave forms are identicle).

Anyway, the Hz difference is easily calculated for you; it is the number on the time you're at in the video. Basically means I am increasing the frequency by 1 every second for your convenience.
After 64 seconds, just take 64 seconds off the counter because I start with the 25% and the 75% (you can call it the "anti-25%" - it's basically the opposite).
They sound different because one reinforces the other while the first one only cancels itself out.