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Date:         Thu, 21 Oct 2004 22:37:38 -0700
Reply-To:     Doug in Calif <vanagon@ASTOUND.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Doug in Calif <vanagon@ASTOUND.NET>
Subject:      Re: noise reduction
Comments: To: jbange <hfinn@INGRATES.NET>
Content-Type: text/plain; charset="iso-8859-1"

I heard rumor the military was working on a cloaking system that had tiny light receivers on one side of a military vehicle and light emitters on the other. The vehicle could see everything to one side of it and broadcast the same image on its side.

Cool huh?

----- Original Message ----- From: "jbange" <hfinn@INGRATES.NET> To: <vanagon@GERRY.VANAGON.COM> Sent: Thursday, October 21, 2004 9:04 PM Subject: Re: noise reduction

> At 06:25 PM 10/21/2004, you wrote: > >Why don't you use a noise cancelling system? Measure the frequency of the > >noise, and run it through your stereo amplifier phase shifted 180 > >degrees? You might even be able to make it automatically adjustable based > >on MPH. > > That'd only work if the original noise was coming from behind the speakers. > The "anti-noise" has to be projected in the same direction the noise is > coming from in order to match the waveforms so they cancel. I'm waiting for > them to develop a double-layered piezo sandwich material, with the bottom > layer acting as the microphone and the top layer transmitting the > anti-noise. It'd in theory be a perfect soundproofing material. Something > like that's a long way off, though... > > John Bange > '90 Vanagon "Geldsauger"


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