Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10 5/3/83; site watdaisy.UUCP Path: utzoo!watmath!watdaisy!cbostrum From: cbostrum@watdaisy.UUCP (Calvin Bruce Ostrum) Newsgroups: net.music Subject: Alternate Scales Message-ID: <235@watdaisy.UUCP> Date: Thu, 21-Jul-83 05:43:02 EDT Article-I.D.: watdaisy.235 Posted: Thu Jul 21 05:43:02 1983 Date-Received: Thu, 21-Jul-83 06:54:14 EDT Organization: U of Waterloo, Ontario Lines: 27 Someone submitted something about other scales, meaning scales differenr from our evenly tempered 12 tone scale, suggesting maybe 16 or something like that. I got slightly interested in this about 8 years ago and played around with different possibilities. The fact that we suggest N tones at all indicates that we want them to be cyclic. This is a presupposition that need not be made. Presumably, the N+1st tone is just double the second tones frequency, thus basing the whole thing on octaves because of their "obvious" plesant sounding nature. (Let's hear from someone who knows whether there is a strong physiological basis for this; I may be dense but I dont think it is obvious at *all*). One we grant this whole pythagorean schtick, we will want our scale to have good approximations to the other (w)holy intervals such as 3/2, 4/3, 5/4. If we also desire that the ratio between notes is a constant, allowing us to get tonality from any starting point, we require an N such that 2**(i/N) gives us good approximations to these values for various i. My vague recollection (too tired to figure it out now) is that 12 gave excellent approximations to these values whereas suprisingly, larger values of N did not. Of course, we can drop the golden thigh stuff. I am quite skeptical of it myself, which is why I would appreciate some expert input from any experts out there. In that case, there would be all sorts of possibilties for discrete (but perhaps not discreet) scales. Calvin Bruce Ostrum, Computer Science, University of Waterloo ...{decvax,allegra,utzoo}!watmath!watdaisy!cbostrum