Editing Musical note (section)

==== MIDI ====
For use with the [[MIDI]] (Musical Instrument Digital Interface) standard, a frequency mapping is defined by:

:<math>p = 69 + 12 \times \log_2\frac{f}{440 \text{ Hz}} \, ,</math>

where <math>p</math> is the MIDI note number. 69 is the number of semitones between C<sub>−1</sub> (MIDI note 0) and A<sub>4</sub>.

Conversely, the formula to determine frequency from a MIDI note <math>p</math> is:

:<math>f=2^\frac{p-69}{12} \times 440 \text{ Hz} \, .</math>

{{anchor|History of note names}}<!-- anchor used by other linking pages -->