Damn wheres an acoustical engineer when you need one :)
It's got to do with standing waves and the cancellation effect achieveable
by exploiting them. IE with two sound waves of the same frequency but
different phase, the peaks of one wave cancel the dips of the other
Or something :)
- Tom
----- Original Message -----
From: "Lincoln Yeo" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, February 23, 2001 11:43 AM
Subject: Re: exhaust noises
> yeah, ive heard of a similar principle (i saw it on beyond 2000)
> - basically it works by um... ok imagine the noise a helicopter
> makes - sort of whup whup whup etc - well basically i think it
> works by adding a whup inbetween the other whups, and it turns
> out u cant hear a constant whup because it is actually a pulse -
> so u end up with little sound...
>
> Linc
>
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