cxchord
v1.1.3
Published
Midi Chord Recognizer
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Maintainers
bernhardpawReadme
CxChord
Midi chord recognizer
Recognizes Chords from an array of midi notes and uses a Bayes probalistic method to find the most likely matches.
An explaination of Midi Note Numbers can be seen here.
This examples/sample.html file will generate the following web-page:
Installation:
npm install cxchordUsage JavaScript (sample.js):
Go into the example directory:
cd examples//
// Lookup Chords for midi notes
//
var CxChord = require('../lib/CxChord');
console.log("-------------------");
var midiChord = [64, 67, 71, 72, 74, 78, 81 ];
var cm = new CxChord.ChordMatcher()
cm.match(midiChord)
var mached = cm.getMatch();
console.log( JSON.stringify(mached, null, " ") );
console.log("-------------------");
console.log("First match a normal Major Chord:");
var midiChord = [ 63, 67, 69, 74];
var cm = new CxChord.ChordMatcher();
cm.match(midiChord);
mached = cm.getMatch();
console.log( JSON.stringify(mached, null, " ") );
console.log("-------------------");
console.log("Then the same notes, but this time favor a Jazz block chord interpretation:");
cm.favorJazz(true);
cm.match(midiChord);
mached = cm.getMatch();
console.log( JSON.stringify(mached, null, " ") );Execute the script at the command prompt:
$ node sample.jsUsage TypeScript (tsSample.ts):
import * as CxChord from "../lib/CxChord"
console.log("-------------------");
var midiChord = [64, 67, 71, 72, 74, 78, 81 ];
var cm = new CxChord.ChordMatcher()
cm.match(midiChord)
var mached = cm.getMatch();
console.log( JSON.stringify(mached, null, " ") )Compile and execute the script at the command prompt:
$ tsc tsSample.ts
$ node tsSample.jsUsage HTML (examples/sample.html):
<!doctype html>
<html>
<head>
<title>CxChord HTML Example</title>
<meta http-equiv="content-type" content="text/html; image/svg; charset=utf-8 ;">
<meta http-equiv="Content-Security-Policy" content="default-src 'self'; img-src 'self' blob: data:; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'">
</head>
<body>
<h2> Match midi notes 64, 67, 71, 72, 74, 78, 81 ( E, G, B, C, D, F#, A ) </h2>
<blockquote>
Identifies a Cmaj type chord in first inversion (here displaying the first 15 chord-posibilities ranked):
<table>
<tr>
<td >
<canvas id="visualization" height="400" width="1300" ></canvas>
</td>
<td>
<div id="legend"></div>
</td>
</tr>
</table>
</blockquote>
<script type="text/javascript" src="./sample.html.bundle.js"></script>
</body>
</html>Open the html file in your browser, e.g. in vscode right and choose Open In Default Browser. Note that the examples/sample.html.bundle.js is a browseryfied and bablified version of examples\sample.html.js in order to work in the browser. Have a look at BrowserifyBuild.js to see how that works.
You can have a look at the test specification src/CxChordSpec.ts for more details.