pitch_percentages_for_semitones_and_notes
Relative pitch percentage & semitone note table
(This is useful if you're making a controller act similar to the Vestax Controller One.)
| Note name | Semitones | Pitch percentage |
|---|---|---|
| A | -12 = 1 octave | -50% |
| Bb | -11 | -47.03% |
| B | -10 | -43.88% |
| C | -9 | -40.54% |
| Db | -8 | -37.00% |
| D | -7 | -33.26% |
| Eb | -6 | -29.29% |
| E | -5 | -25.08% |
| F | -4 | -20.63% |
| Gb | -3 | -15.91% |
| G | -2 | -10.91% |
| Ab | -1 | -5.61% |
| A - 440Hz | 0 | 0.00% |
| A# | 1 | +5.95% |
| B | 2 | +12.25% |
| C | 3 | +18.92% |
| C# | 4 | +25.99% |
| D | 5 | +33.48% |
| D# | 6 | +41.42% |
| E | 7 | +49.83% |
| F | 8 | +58.74% |
| F# | 9 | +68.18% |
| G | 10 | +78.18% |
| G# | 11 | +88.77% |
| A | 12 = 1 octave | +100% |
This was calculated using the following information. Since an octave doubles (or halves) the frequency and there are 12 equal steps (semitones), we can find that the frequency is multiplied (or divided) by a certain factor:
mfact = 12th root of 2 = 2^(1/12) = 1.0594631
So you get
| A | 440Hz |
| A# | 440*1.059 = 466.2 Hz |
| B | 440*(1.059*1.059) = 493.9 Hz |
etc..
45rpm is 36.36% faster than 33rpm
and
33rpm is 26.7% slower that 45rpm
pitch_percentages_for_semitones_and_notes.txt · Last modified: 2014/07/08 18:09 by ewanuno
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