How many frequencies is an octave?

Theory. For example, if one note has a frequency of 440 Hz, the note one octave above is at 880 Hz, and the note one octave below is at 220 Hz. The ratio of frequencies of two notes an octave apart is therefore 2:1. read more

For example, if one note has a frequency of 440 Hz, the note one octave above is at 880 Hz, and the note one octave below is at 220 Hz. The ratio of frequencies of two notes an octave apart is therefore 2:1. read more

While the frequencies of the 12 semitones of the octave progress in geometric proportions (one semitone = f * (2^[1/12]), the sounds we perceive are evenly spaced. If a note has the frequency “f”, one octave higher = 2f. read more