Actually an octave contains 12 notes. The frequency of each note is a facto= r of the twelfth root of two higher than the next lower note. When you look a= t just the "white keys" you are only looking at 7 of the notes in the octave, and they are not evenly spaced in frequency. ~ Bob Ammerman RAm Systems -----Original Message----- From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of David C Brown Sent: Monday, August 18, 2014 5:18 PM To: Microcontroller discussion list - Public. Subject: Re: [OT] Octaves No. An octave is an interval of seven notes. A-B, B-C, C-D, DE, E-F, F-G, G-A. Seven notes. So WTF is it called an octave? On 18 August 2014 20:36, Bob Blick wrote: > An octave represents eight notes, not a factor of eight. > > Makes more sense than "flammable" and "inflammable" :) > > Bob > > On Mon, Aug 18, 2014, at 11:31 AM, David C Brown wrote: > > A decade is a factor of ten so an octave must be a factor of eight=20 > > mustn't > > it? Well, no it is actually a factor of two. Why? Very illogical. > > I know it is borrowed from musical theory where an octave is an=20 > > interval of seven notes. Equally illogical > > -- > http://www.fastmail.fm - Same, same, but different... > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive=20 > View/change your membership options at=20 > http://mailman.mit.edu/mailman/listinfo/piclist > -- __________________________________________ David C Brown 43 Bings Road Whaley Bridge High Peak Phone: 01663 733236 Derbyshire eMail: dcb.home@gmail.com SK23 7ND web: www.bings-knowle.co.uk/dcb -- http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/chang= e your membership options at http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .