[linux-audio-user] transposing frequency

[Tyler Eaves]

On Mon, 12 Dec 2005 11:40:53 -0500, tim hall  
<tech at glastonburymusic.org.uk> wrote:

> 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.

The fundamental multiplier is is the 12th root of 2.


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