🚀 go-pugleaf

meyers@lorenz.ocean.fsu.edu (Steve Meyers) writes...
>announced an ability to reduce or eliminate noise associated with 
>industrial production with a technique that "uses electricity". 
>I guess their claim is they can make a factory quiet. Has anyone 
>heard about this? Is it true? 
	Yes, this is true.  Sound waves are waves, and
can be interfered with, both constructively and destructively.
If I have a speaker system such that sound waves are exactly
out of phase with the factory motor, the sound waves are cancelled.
You can either do this right in front of your ear, or on a surface
around the noisy motor.  To do it well with today's audio technology,
the motor has to have a very periodic sound signature,
which most motors do.
  I am afraid I cannot find the articles I have about it,
but search the periodical guide in a library for
active noise elimination or electronic mufflers.