music-math

A utility library for calculating musical information e.g. a note from a frequency

Install

$ npm install --save music-math

Usage

var Frequency = require('music-math').Frequency;

var freqDetails = Frequency(440)

console.log(JSON.stringify(freqDetails))
//=> {"frequency":440,"noteNumber":57,"note":"A","octave":4,"offset":0}

API

Frequency(frequency)

frequency

• Required
• Type: number

The frequency to perform calculations on (in Hz).

Returns an object with the following properties (lazily calculated first time you request them):

frequency

• Type: number

The frequency of the note (in Hz)

noteNumber

• Type: number

The number of the [closest matching] note in the scale

note

• Type: string

The [closest matching] note in the scale

octave

• Type: number

The octave the frequency resides in

offset

• Type: number

The measure of how off pitch the frequency is from the closest matching note (in cents)

Contributing

Help Wanted!

This utility was pulled out of a little fun side project I was working on - I am by no means versed in musical theory. I would be immensely grateful of any help especially in the form of:

• corrections to my terminology
• corrections to the math
• additional test cases (especially failing ones that reveal flaws in my math!)

All pull requests / issues / feedback welcome :) Thanks!

Build

npm run build

Test

npm test

Watch

To watch for changes, build them and run the tests:

npm run watch

License

MIT © James Bunt