[sdiy] math question - somewhat OT

[Scott Gravenhorst]

Yeah, backwards again...

Ian Fritz <ijfritz at earthlink.net> wrote:
>At 02:24 PM 9/21/2004, Scott Gravenhorst wrote:
>>          (n/12+v)
>>f = s * 2
>>
>>where f is frequency in Hz, s is scale factor (constant), n
>>is an integer note number (increments 1 for each semitone)
>>and v is an integer representing an octave.
>>
>>The constant value s can be set so that particular values of
>>n and v give the standard frequency values such as 440 Hz.
>
>
>I believe he wants the inverse of that.  The formula is:
>
>p = (12/log2)log(f/f0),
>
>Where f is the frequency and p is the pitch in semitones relative to the 
>pitch of f0.  The log function can be to any base, ie, log_10, ln, etc.
>
>   Ian
>
>

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