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conversion formula help

I need help on a Patch
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soundmind
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Unread post by soundmind » 06 Feb 2010, 01:06

Greetings all. I am trying to convert frequency to milliseconds but after dividing 1000 by the frequency i cannot figure out how to increment the milliseconds by semitones. Any ideas? thanks
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woodslanding
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Unread post by woodslanding » 06 Feb 2010, 06:08

semitones are the twelfth root of two, since an octave is the ratio of 2:1, and there are 12 of them in an octave.

You can approximate this with 1.06. There is a closer approximation in wikipedia, search for 'semitone' or 'twelfth root of two'.....

A is 440hz, so Bb is 440 * 1.06
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soundmind
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Unread post by soundmind » 06 Feb 2010, 06:46

thanks for explaining this. you have put it into perspective. thanks
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