42 Audio Illusions amp Phenomena Part 15 of Psychoacoustics

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=OiW8gzBGz1A

**!!! You must disable audio enhancement before listening !!!** • On windows disable all enhancements for all devices, on mac disable sound enhancer , on mobile make sure you aren't using mono audio, and if you have a control panel for your headphones make sure to disable any and all similar stuff ( enhancements , auto leveling , Dolby Atmos, etc)! Noise canceling headphones might also mess with these demonstrations! Simulated surround sound headphones, etc. -- all these things may affect the truth of what you're hearing. You also need to listen to the 720p version or better -- the lower-quality streams degrade the audio (including the stereo separation). • This series presents a variety of fascinating psychoacoustic phenomena and illusions. • We will cover 42 of them, with examples and explanations along the way. See if they work on you! • Donation links: http://lacinato.com/donate | / lacinato • Series playlist: • 42 Audio Illusions Phenomena -- Psy... • Errata: • · the Tritone Paradox demo audio is incorrect: it is supposed to be a tritone apart, and was in my audio project, but a rendering glitch driving the automation of the synth I made caused it to be more like a step apart. The illusion is real, but my demo is bad. :-) There is a corrected version in Part 7: • Part 7/5 of Psychoacoustics / Audio I... • · re: binaural beats: some people can't hear them. There is apparently a difference between genders, and menstruation may also play a role in whether a person can hear this effect. If you can't hear them, you might try again another time. More info in Auditory Beats in the Brain by G. Oster -- PMID: 4727697 DOI: 10.1038/scientificamerican1073-94 • There is also a common issue where on some systems the left and right channels are polluting each other. In the actual audio there is only a single tone in each ear at 2:20. If you take out an earbud (and you're sure you can't ear the earbud you took out through the air at all), you should definitely hear no beating at 2:20. You can test your system by taking one earbud out and playing from 2:12: when the audio plays one channel and then the other, you should hear total silence in the single earbud for one of those tones. If you hear even a little bit bleeding through, it means your system is not separating the channels properly (and in fact this may explain a lot of the cases where other illusions in this series don't work!) Try finding a playback system that isolates the left/right signals perfectly at 2:12, and then watch the videos again. • I'd also appreciate reports under this comment about whether your system does or doesn't perfectly isolate the left/right channels on your headphones. • · re: otoacoustic emissions: in the video I mention that OEs may result in tinnitus; I wanted to note that tinnitus has many (many) possible causes and having tinnitus does not necessarily mean that you have OEs. • combination tones: starting at 9:56 the synth used to generate those sine tones was slightly out of tune (user error). It shouldn't affect the demonstration much, if at all, but that's why there is a slight beating to the sound. • Index to Part 1: • 0:00 intro • 0:55 binaural beats • 3:09 pitch circularity • 5:42 tritone paradox • 7:23 tempo circularity • 9:43 combination tones • 10:38 missing fundamental • 13:00 otoacoustic emission • Tritone paradox: Deutsch, D. (1991). The tritone paradox: An influence of language on music perception . Music Perception. 8 (4): 335–347. doi:10.2307/40285517. JSTOR 40285517 • Risset beats created with (a slightly modifed version of) Dan Stowell's SuperCollider script: • https://swiki.hfbk-hamburg.de/MusicTe... • https://supercollider.github.io/ • Check out these cool pitch circularity tracks: • • Infinite Scales (Descending) • • Infinite Scales (Ascending) • Otoacoustic emissions image from: Dalhoff, E. et al Distortion product otoacoustic emissions measured as vibration on the eardrum of human subjects. Proceedings of X the National Academy of Sciences 104.5 (2007): 1546-1551; https://doi.org/10.1073/pnas.0610185103 • This video was made in Reaper and Blender, with final editing/compositing done in Davinci Resolve. Some custom software was written to generate various tones and such, and this was done in JSFX in Reaper.

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