From mboxrd@z Thu Jan 1 00:00:00 1970 To: 9fans@cse.psu.edu Subject: Re: [9fans] sound of moving mouse ^_^ From: David Gordon Hogan MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="upas-zibquwmpjyjosewbrlmdmrtjcd" Message-Id: <20011116195159.4AEC519A49@mail.cse.psu.edu> Date: Fri, 16 Nov 2001 14:51:55 -0500 Topicbox-Message-UUID: 2419b256-eaca-11e9-9e20-41e7f4b1d025 This is a multi-part message in MIME format. --upas-zibquwmpjyjosewbrlmdmrtjcd Content-Disposition: inline Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit I've experienced similar phenomena in the past. I'd put it down to temporal correlations in address bus usage, leading to an audio frequency spike in the frequency domain of the EM signal that it emits. The address bus is the antenna, and you can't really tie a knot in it :-) You just need better sound hardware. Most PC sound cards are crap. They are not adequately shielded (in fact, generally not shielded at all). One possibility is one of these new-fangled USB->SP/DIF convertors, and plug the SP/DIF (digital audio) into a modern amplifier that supports it. Sape's working on the driver support for this I believe. Perhaps USB powered speakers would do the trick. You could also get a professional quality audio card; I think there's one made by a company called Turtle Beach or something; some music stores here sell them. No idea if they are Plan 9 compatible. --upas-zibquwmpjyjosewbrlmdmrtjcd Content-Type: message/rfc822 Content-Disposition: inline Received: from mail.cse.psu.edu ([130.203.4.6]) by plan9; Thu Nov 15 20:15:25 EST 2001 Received: from psuvax1.cse.psu.edu (psuvax1.cse.psu.edu [130.203.4.6]) by mail.cse.psu.edu (CSE Mail Server) with ESMTP id B7946199ED; Thu, 15 Nov 2001 20:15:11 -0500 (EST) Delivered-To: 9fans@cse.psu.edu Received: from granite.cias.osakafu-u.ac.jp (granite.cias.osakafu-u.ac.jp [157.16.101.69]) by mail.cse.psu.edu (CSE Mail Server) with SMTP id EE268199EA for <9fans@cse.psu.edu>; Thu, 15 Nov 2001 20:14:39 -0500 (EST) To: 9fans@cse.psu.edu From: okamoto@granite.cias.osakafu-u.ac.jp MIME-Version: 1.0 Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit Message-Id: <20011116011439.EE268199EA@mail.cse.psu.edu> Subject: [9fans] sound of moving mouse ^_^ Sender: 9fans-admin@cse.psu.edu Errors-To: 9fans-admin@cse.psu.edu X-BeenThere: 9fans@cse.psu.edu X-Mailman-Version: 2.0.7 Precedence: bulk Reply-To: 9fans@cse.psu.edu List-Help: List-Id: Fans of the OS Plan 9 from Bell Labs <9fans.cse.psu.edu> List-Archive: Date: Fri, 16 Nov 2001 10:15:26 +0900 This is just from curiosity. :-) My DEC PC leaks small sound to my speaker␣boxes when I move the mouse. When I do it on an acme window, it sounds in lower pitches than on a raw rio windows. Yes, the difference is considerablly large. I suppose this may reflect the rate of something related to detect the mouse event. If so, that is higher in raw rio than in acme. Is this right? :-) Kenji --upas-zibquwmpjyjosewbrlmdmrtjcd--