Hearing loss & airbags

[Ron Blue]

On Wed, 2 Oct 1996, G. M. Alf wrote:
> >We all know that any sound can be cancelled out by its harmonic.  A simple
> >circuit can do this.  Ron Blue
> >
> The harmonic of a sound would actually increase the overall sound.
> The sound that is to be eliminated must be shifted 180 degrees then
> reintroduced into the environment in such a way that it reaches the
> ears of the person at the same time as the original sound.  A
> particular automobile uses this concept in a muffler where the exhaust
> sound is inverted and fed back into the system through special
> speakers.
> 
> Mike
> 
> 
CORRECT, an INVERSE harmonic.  Ron