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## midi-note-to-freq.md

      
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                / midi-note-to-freq.md
            
            
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              August 10, 2025 15:25
            
              
                How to convert midi note to frequency in C, C++, Python, JS and PHP
              
          
    JS

function noteToFreq(note) {
    let a = 440; //frequency of A (coomon value is 440Hz)
    return (a / 32) * (2 ** ((note - 9) / 12));
}
PHP

function noteToFreq($note) {

  
## map.js
Number.prototype.map = function (in_min, in_max, out_min, out_max) {
  return (this - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}

## gist:1032746
var BASE64_MARKER = ';base64,';

function convertDataURIToBinary(dataURI) {
  var base64Index = dataURI.indexOf(BASE64_MARKER) + BASE64_MARKER.length;
  var base64 = dataURI.substring(base64Index);
  var raw = window.atob(base64);
  var rawLength = raw.length;
  var array = new Uint8Array(new ArrayBuffer(rawLength));

  for(i = 0; i < rawLength; i++) {
	Number.prototype.map = function (in_min, in_max, out_min, out_max) {
	return (this - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
	}
	var BASE64_MARKER = ';base64,';

	function convertDataURIToBinary(dataURI) {
	var base64Index = dataURI.indexOf(BASE64_MARKER) + BASE64_MARKER.length;
	var base64 = dataURI.substring(base64Index);
	var raw = window.atob(base64);
	var rawLength = raw.length;
	var array = new Uint8Array(new ArrayBuffer(rawLength));

	for(i = 0; i < rawLength; i++) {