Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!unmvax!pprg.unm.edu!hc!ames!pasteur!agate!e260-2d.berkeley.edu!c60a-2di From: c60a-2di@e260-2d.berkeley.edu (The Cybermat Rider) Newsgroups: comp.sys.next Subject: Re: Fwd: LSC problem Summary: Stealth Message-ID: <17953@agate.BERKELEY.EDU> Date: 7 Dec 88 08:26:55 GMT References: <4000001@altair> <32595@bbn.COM> Sender: usenet@agate.BERKELEY.EDU Organization: University of California, Berkeley Lines: 33 In article <32595@bbn.COM> jr@bbn.com (John Robinson) writes: >In article <4000001@altair>, boyle@altair writes: [misc. stuff about sound cancellation deleted] >The only thing I am aware of that works something like this is the >conjugate mirror stuff (see a recent SciAm article) for coherent >light. The device (if my memory serves me correctly) is called a "phase conjugator". Constructing a similar device for sound would be pretty difficult, coz you still have to worry about the delay between the original and conjugated waves. > Maybe if they would tell us about how the stealth planes work >too. The way I see it, Stealth merely ABSORBS or DEFLECTS radar waves to ensure that they don't return to the receiver and betray its position. Sound cancellation equipment probably isn't built-in, since it's designed to fly SLOW and (given its SIZE) HIGH, so unless you're thinking of a ground-based equivalent of "Big Ears", such expensive (and probably cumbersome) equipment probably isn't necessary. >-- >/jr >jr@bbn.com or bbn!jr ---------------------------------------------------------------------------- Adrian Ho a.k.a. The Cybermat Rider University of California, Berkeley c60a-2di@web.berkeley.edu Disclaimer: Nobody takes me seriously, so is it really necessary?