[rescue] Thoughts on system noise...
Sridhar the POWERful
vance at ikickass.org
Mon Mar 25 14:33:29 CST 2002
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.
> Tell us POWERful Sridhar! We seek your knowledge.
> rescue list - http://www.sunhelp.org/mailman/listinfo/rescue
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