[sdiy] saw vs ramp, audible?

[Roman Sowa]

This is how "voices-in-my-had-gun" works. You point highly focused, 
directional ultrasound emiter to someone's head far away, and due to 
intermodulation, that person, and only that person hears whatever you 
want them to hear, not able to tell where that comes from.
It must be scary and mindblowing to someone unaware of this attack.

Roman

W dniu 2024-12-10 o 02:19, Donald Tillman pisze:
> On Dec 9, 2024, at 12:18 PM, Mattias Rickardsson <mr at analogue.org> wrote:
>>
>> How linear is the human hearing, compared to the speakers or 
>> headphones needed to do these listening tests?
> 
> Good question!  Not very linear.
> 
> "How nonlinear?"
> 
> Nonlinear enough that you can make music with the intermodulation 
> distortion products.
> 
> "WTF?"
> 
> I heard an impressive demo at Stanford's CCRMA a while ago where Alex 
> Chechile created a piece of music with notes were never actually played, 
> but where created in the intermodulation distortion products inside the ear.
> 
> Alex Chechile, "Practical applications of difference tones in electronic 
> music composition and synthesis"
> https://searchworks.stanford.edu/view/13680791 
> <https://searchworks.stanford.edu/view/13680791>
> 
>    -- Don
> --
> Donald Tillman, Palo Alto, California
> https://till.com
> 
> 
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