[rescue] Thoughts on system noise...

[Sridhar the POWERful]

On Sun, 24 Mar 2002, Jonathan Eisch wrote:

> > I suppose you have to place a microphone at sufficient distance between the
> > listener and the source of offending noise, so that there is sufficient time
> > to compute and generate the appropriate opposition waveform. I bet it's not
> > easy at *all* to engineer properly.
>
> Please tell me that this is an analog type thing.  My guess is that it would
> be hard to get the generated 'anti-sound' to disperse similarly to the
> original sound, and to get the phases to match up in all directions.

Well, when I did it, I did it digital, and used pattern matching to not
cancel out certain noise.  And you have to calculate in several points,
using several microphone/electronics/speaker installations, depending on
the size of the room.

Peace...  Sridhar

> Tell us POWERful Sridhar!  We seek your knowledge.
>
> -Jonathan
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