[linux-audio-user] transposing frequency

[tim hall]

On Sunday 11 December 2005 21:37, Atte André Jensen was like:
> 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)?

It's something like:
Pitch (Hz) = log(27.5/log(2)) + chromatic_note/12
for 12Tet, but I would check this out as I'm slightly mathematically dyslexic.
-- 
cheers,

tim hall
http://glastonburymusic.org.uk/tim