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

[Peter Clarke]

On Monday 12 December 2005 07:00, 
linux-audio-user-request at 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