To calculate frequency of a note you should know the amount of semitones between the note and A4.
2x/12 * ffixed = fgiven
where:
x – is the quantifier, based on amount of semitones between given note and fixed one (A4
);
ffixed – is the frequency of fixed note (~A4 = 440 Hz);
For example, since C4
is nine semitones lower than A4
, the quantifier for it will be -9
.
So, whether it is possible to calculate its frequency without knowing of this interval? Is there any other frequency-of-a-pitch equation that doesn't use intervals in it?