note frequency value
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var noteValues = { | |
'C0': 16.35, | |
'C#0': 17.32, | |
'Db0': 17.32, | |
'D0': 18.35, | |
'D#0': 19.45, | |
'Eb0': 19.45, | |
'E0': 20.60, | |
'F0': 21.83, | |
'F#0': 23.12, | |
'Gb0': 23.12, | |
'G0': 24.50, | |
'G#0': 25.96, | |
'Ab0': 25.96, | |
'A0': 27.50, | |
'A#0': 29.14, | |
'Bb0': 29.14, | |
'B0': 30.87, | |
'C1': 32.70, | |
'C#1': 34.65, | |
'Db1': 34.65, | |
'D1': 36.71, | |
'D#1': 38.89, | |
'Eb1': 38.89, | |
'E1': 41.20, | |
'F1': 43.65, | |
'F#1': 46.25, | |
'Gb1': 46.25, | |
'G1': 49.00, | |
'G#1': 51.91, | |
'Ab1': 51.91, | |
'A1': 55.00, | |
'A#1': 58.27, | |
'Bb1': 58.27, | |
'B1': 61.74, | |
'C2': 65.41, | |
'C#2': 69.30, | |
'Db2': 69.30, | |
'D2': 73.42, | |
'D#2': 77.78, | |
'Eb2': 77.78, | |
'E2': 82.41, | |
'F2': 87.31, | |
'F#2': 92.50, | |
'Gb2': 92.50, | |
'G2': 98.00, | |
'G#2': 103.83, | |
'Ab2': 103.83, | |
'A2': 110.00, | |
'A#2': 116.54, | |
'Bb2': 116.54, | |
'B2': 123.47, | |
'C3': 130.81, | |
'C#3': 138.59, | |
'Db3': 138.59, | |
'D3': 146.83, | |
'D#3': 155.56, | |
'Eb3': 155.56, | |
'E3': 164.81, | |
'F3': 174.61, | |
'F#3': 185.00, | |
'Gb3': 185.00, | |
'G3': 196.00, | |
'G#3': 207.65, | |
'Ab3': 207.65, | |
'A3': 220.00, | |
'A#3': 233.08, | |
'Bb3': 233.08, | |
'B3': 246.94, | |
'C4': 261.63, | |
'C#4': 277.18, | |
'Db4': 277.18, | |
'D4': 293.66, | |
'D#4': 311.13, | |
'Eb4': 311.13, | |
'E4': 329.63, | |
'F4': 349.23, | |
'F#4': 369.99, | |
'Gb4': 369.99, | |
'G4': 392.00, | |
'G#4': 415.30, | |
'Ab4': 415.30, | |
'A4': 440.00, | |
'A#4': 466.16, | |
'Bb4': 466.16, | |
'B4': 493.88, | |
'C5': 523.25, | |
'C#5': 554.37, | |
'Db5': 554.37, | |
'D5': 587.33, | |
'D#5': 622.25, | |
'Eb5': 622.25, | |
'E5': 659.26, | |
'F5': 698.46, | |
'F#5': 739.99, | |
'Gb5': 739.99, | |
'G5': 783.99, | |
'G#5': 830.61, | |
'Ab5': 830.61, | |
'A5': 880.00, | |
'A#5': 932.33, | |
'Bb5': 932.33, | |
'B5': 987.77, | |
'C6': 1046.50, | |
'C#6': 1108.73, | |
'Db6': 1108.73, | |
'D6': 1174.66, | |
'D#6': 1244.51, | |
'Eb6': 1244.51, | |
'E6': 1318.51, | |
'F6': 1396.91, | |
'F#6': 1479.98, | |
'Gb6': 1479.98, | |
'G6': 1567.98, | |
'G#6': 1661.22, | |
'Ab6': 1661.22, | |
'A6': 1760.00, | |
'A#6': 1864.66, | |
'Bb6': 1864.66, | |
'B6': 1975.53, | |
'C7': 2093.00, | |
'C#7': 2217.46, | |
'Db7': 2217.46, | |
'D7': 2349.32, | |
'D#7': 2489.02, | |
'Eb7': 2489.02, | |
'E7': 2637.02, | |
'F7': 2793.83, | |
'F#7': 2959.96, | |
'Gb7': 2959.96, | |
'G7': 3135.96, | |
'G#7': 3322.44, | |
'Ab7': 3322.44, | |
'A7': 3520.00, | |
'A#7': 3729.31, | |
'Bb7': 3729.31, | |
'B7': 3951.07, | |
'C8': 4186.01 | |
} |
Thanks man!
Ur the man! Using this for a hackathon now!
why does it stop at c8?
Thanks!
Source possibly comes from https://pages.mtu.edu/~suits/notefreqs.html.
@aluminumChassis because its just using a formula anyway, to get c9
just do c8 * 2
same for any other note, ie: for A10
multiply A9
by 2
Thanks for this info !
var NOTES = ["C", "C#", "D", "Eb", "E", "F", "F#", "G", "G#", "A", "Bb", "B"];
function getPitch(note, octave) {
// ("A", 4) => 440
// multiply by 2^(1/12) N times to get N steps higher
var step = NOTES.indexOf(note);
var power = Math.pow(2, (octave * 12 + step - 57)/12);
var pitch = 440 * power;
return pitch;
}
Found this too late 🤣 , love @bblack 's function to get the frequencies dynamically, but as I already did the work, here's an object notation of the same, might come handy to someone:
const map = {
'C': [16.35, 32.70, 65.41, 130.8, 261.6, 523.3, 1047, 2093, 4186],
'C#': [17.32, 34.65, 69.3, 138.6, 277.2, 554.4, 1109, 2217, 4435],
'D': [18.35, 36.71, 73.42, 146.8, 293.7, 587.3, 1175, 2349, 4699],
'Eb': [19.45, 38.89, 77.78, 155.6, 311.1, 622.3, 1245, 2489, 4978],
'E': [20.6, 41.2, 82.41, 164.8, 329.6, 659.3, 1319, 2637, 5274],
'F': [21.83, 43.65, 87.31, 174.6, 349.2, 698.5, 1397, 2794, 5588],
'F#': [23.12, 46.25, 92.5, 185, 370, 740, 1480, 2960, 5920],
'G': [24.5, 49, 98, 196, 392, 784, 1568, 3136, 6272],
'G#': [25.96, 51.91, 103.8, 207.7, 415.3, 830.6, 1661, 3322, 6645],
'A': [27.5, 55, 110, 220, 440, 880, 1760, 3520, 7040],
'Bb': [29.14, 58.27, 116.5, 233.1, 466.2, 932.3, 1865, 3729, 7459],
'B': [30.87, 61.74, 123.5, 246.9, 493.9, 987.8, 1976, 3951, 7902],
};
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Was going to do this and now I don't have to do so. Big thanks!!!