Subject: RE: [hackers-il] can u create a muffler using ur home sb.

From: "Ofir Carny" <[email-masked]>
Date: Wed, 22 Jan 2003 11:44:10 +0200

There are such solutions, but AFAIK only with earphones. You see, because of the limited speed of sound, different places in your house will experience diffrent phases (and also amplitudes) of the noise, and it is hard to cancel them all at once. Plus, the canceling signal will also be at different phases (and amplitudes) - a whole mess.

see http://headwize2.powerpill.org/projects/noise_prj.htm for an example of such a project.

-----Original Message-----
From: Tzahi Fadida [mailto:[email-masked]]
Sent: Tuesday, January 21, 2003 7:12 PM
To: [email-masked]
Subject: [hackers-il] can u create a muffler using ur home sb.

Does anyone knows if there is a possibility to use the computer sb with a simple or not simple
microphone and outputing to an amplifier or to small speakers (whichever works)
to muffle the high background pitch that gets out from TVs and computers, and especially disk
drives.
even if your computer and every electric device in your appartment is off, you will still hear
the high pitch sound from the entire neighbourhood. this pitch is considered in some places
as noise pollution.
i know that there are some external noise muffler for air conditioning systems, but i would really
want to know if you can create a canceling noise to kill the noise pollution or at least subdue it.
n.b in modern s.b you have the ability to mix this noise canceling on a different channel, but
i gather the most problematic thing is to reprocess the noise fast enough or predicting it with
accuracy.

n.b 2 : i have little knowledge in frequencies and sounds, so u'll have to forgive me if my question
is absurd.

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