Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!zephyr.ens.tek.com!tekred!vekurpan
From: vekurpan@tekred.CNA.TEK.COM (Vincent E Kurpan)
Newsgroups: sci.electronics
Subject: Re: Need  circuit to drop music an octave
Message-ID: <6101@tekred.CNA.TEK.COM>
Date: 7 Aug 90 15:43:09 GMT
References: <1990Jul20.223615.4305@portia.Stanford.EDU> <1332@fs1.ee.ubc.ca> <58975@lanl.gov> <32424@cup.portal.com> <1990Aug06.150222.23167@pmafire.UUCP> <15547@thorin.cs.unc.edu>
Reply-To: vekurpan@tekred.CNA.TEK.COM (Vincent E Kurpan)
Followup-To: Freqeuncy shifter for lower tone
Organization: Tektronix, Inc.,  Redmond, OR.
Lines: 11

In a previous article an author suggests using a mixer sceme
to convert frequency.  this can not be used for anything like this
because it will only subtract frequency and not divide.  If you
did this the spacing between the notes would be all wrong and
would sound very strange... unless you had a different channel for
each note in which case you might as well build the whole source.

Unfortunately, the simplest scheme may be to digitize one cycle of the
waveform and then play back with a clock that is synthesized for each
note.  This is not totally trivial and works only one note at a time.
Theres no free lunch.