Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!husc6!mit-eddie!ll-xn!ames!oliveb!intelca!mipos3!cpocd2!howard From: howard@cpocd2.UUCP (Howard A. Landman) Newsgroups: comp.sys.amiga,comp.sys.mac,comp.sys.atari.st,rec.music.makers,rec.music.synth Subject: Re: Sonic Holography. Message-ID: <1013@cpocd2.UUCP> Date: Mon, 7-Dec-87 12:35:14 EST Article-I.D.: cpocd2.1013 Posted: Mon Dec 7 12:35:14 1987 Date-Received: Sun, 13-Dec-87 08:28:01 EST References: <7536@eddie.MIT.EDU> <2476@gryphon.CTS.COM> Reply-To: howard@cpocd2.UUCP (Howard A. Landman) Followup-To: rec.audio Organization: Intel Corp. ASIC Systems Organization, Chandler AZ Lines: 31 Xref: mnetor comp.sys.amiga:12100 comp.sys.mac:10817 comp.sys.atari.st:6697 rec.music.makers:1185 rec.music.synth:2133 Followup to rec.audio, which is where this belongs. In article <2476@gryphon.CTS.COM> richard@gryphon.CTS.COM (Richard Sexton) writes: >Sonic holograms ? Yes, a friend of mine has a Carver as well. Mighty >impressive. I borrowed one for a test listen. I found that it did make a slight difference in the sound, but only in a very small sweet spot, and not one that was uniformly better for all material. I was not impressed, even given the price of $100 (used). >Plus, there is an audio illusion I've been looking for, for quite >a while now. Basically it is an ever increasing tone. Piece of cake. The trick is to play sine waves at a certain note in all octaves simultaneously. Say you start at A. Then you begin with a mixture of A27.5, A55, A110, A220, A440, A880, A1760, A3520, A7040, A14080 and maybe even A13.75 and A28160 if your equipment is up to it. The relative volumes are higher in the middle and taper off toward the upper and lower registers. Now, you increase the pitch of each wave slightly, and adjust the volumes so that the lower tones are a little louder, and the upper tones are a little softer, in order to keep the "center of gravity" in frequency space at the same place. Repeat this until you have "gone up" one octave; at this point you can delete the tone which is inaudibly high and insert a new tone an octave below the lowest one. Guess what? You now have exactly the same signal that you began with, and can start over. Repeat indefinitely. -- Howard A. Landman {oliveb,hplabs}!intelca!mipos3!cpocd2!howard howard%cpocd2.intel.com@RELAY.CS.NET "Lather. Rinse. Repeat."