[linux-audio-user] Re: linux-audio-user Digest, Vol 27, Issue 38 - Linux-audio-user

12 Dec 2005

On Monday 12 December 2005 07:00, 
linux-audio-user-request(a)music.columbia.edu wrote:
Atte wrote:

...
  Suppose I have an A with a frequency of 440 hz. Which
 formula should I use for transposing x semitones up/down?
 So which frequency would the Bb a half step higher for
 instance have? What about cents (1/100's of half steps)? 
The exact formula is that, to go up a semitone, you multiply 
the frequency by the 12th root of 2, that is 2 to the power 
of 1/12.  I'm not sure how it works with cents, but I'm 
guessing that the ratio is 2 to the power of 1/1200.

Peter Clarke