How to do the calculation? Suppose that two notes have frequenciesį 1 and f 2, and a frequency ratio of f 2/f 1. To note converter written by Andrew Botros. to the nearest note and how far it is out of tune, go to the frequency This table is reproduced below but inverted, i.e. to the nearest note and how far it is out of tune), go These data were used to calculate the first table below, which gives the frequency of any standard keyboard note By convention, A4 is often set at 440 Hz. Each semitone therefore has a ratio of 2 1/12 (approximately 1.059). See Frequency and Pitch for more details and an introduction to frequency and pitch.Īn octave is a ratio of 2:1 and, in equal temperament, an octave comprises 12 equal semitones. The musical interval between two notes depends on the ratio of their frequencies. Note names, MIDI numbers and frequencies are related here in tables and via an application that converts them.
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