Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!utgpu!water!watmath!clyde!rutgers!labrea!rocky!wilson From: wilson@rocky.UUCP Newsgroups: comp.sys.amiga,comp.sys.mac,comp.sys.atari.st,rec.music.makers,rec.music.synth Subject: Re: Sonic Holography. Message-ID: <800@rocky.STANFORD.EDU> Date: Fri, 4-Dec-87 13:50:36 EST Article-I.D.: rocky.800 Posted: Fri Dec 4 13:50:36 1987 Date-Received: Wed, 9-Dec-87 00:38:00 EST References: <7536@eddie.MIT.EDU> <2476@gryphon.CTS.COM> Reply-To: wilson@rocky.UUCP (Randy Wilson) Organization: Stanford University Computer Science Department Lines: 18 Xref: utgpu comp.sys.amiga:11084 comp.sys.mac:9405 comp.sys.atari.st:6179 rec.music.makers:1029 rec.music.synth:1851 >There was a display at the Ontario Science center, ohh, 12 years or so >ago, about MC Escher, that had a ball bouncing "up" an ever increasing >staircase, with this tone, going up in pitch. > >It went up in pitch for the 1/2 hour I stood there. :-) The effect you are looking for is produced by having two tones, one an octave above the other. As they rise in unison, the lower tone slowly becomes louder and the higher one becomes softer, until when they have gone up an octave, the upper tone has completely died out and the lower is where the upper started. Then you bring in a weak tone where the lower one started, and repeat. The ear fools you into thinking it is rising forever. It might work better with more than two tones at octave intervals, but the idea is the same. Randy