Atte Andr? Jensen wrote: > Hi > > 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)? > You know that every note has a frequency which is twice the frequency of the same note an octave below. You have too go from the A at 440 hz to the A at 880 hz with 12 equal steps. So, for each semitone you have to multiply the frequency of the previous note by the twelfth root of two (approx. 1.059463094). See: http://en.wikipedia.org/wiki/Twelfth_root_of_two c www.cesaremarilungo.com
