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Renovating the wheel
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You probably saw [beanangel]'s idea that I just added a link to. I propose headphones with vents
that open and close automatically. When the audio and outside noise are quiet, the vents open
so your ears can air out. When either gets loud, they close to keep the sounds separated. (They
may or may
not be noise-canceling too. Alternatively, they could have a bonus feature of opening
to admit important external sounds like someone yelling at you to get out of the way of a train.)
The vents can be actuated by whatever is practicalmotors, solenoids, HASEL muscles, etc. The
actuators are powered by an integrated rechargeable battery that can be charged with a USB
cable and power source.
[beanangel]'s idea that I just added a link to
Mentioned in idea [notexactly, Mar 10 2018]
||Air-conditioned headphones would be better.
||Peltier-effect coolers (which are silent) and moisture removal systems would be needed.
||But the problem is usually that the ears are freezing cold.
And more so in the winter.
||If vents operate fast enough, would the demon talk?