openmusic-dcbias v1.1.0

openmusic-dcbias

A node for introducing a fixed-value signal in your audio graph

You can use it for things such as:

• shifting the signal upwards/downwards when connected to a gain node (the demo)
• modifying the value of an AudioParam by a fixed-value. E.g. adding -100. by setting the gain.value to -100.

Using it

Create an audio context.

var audioContext = new AudioContext();

Require the code somehow:

var DCBias = require('openmusic-dcbias');

or

<script src="DCBias.js"></script>

Then create instances by passing the context to the function:

var bias = DCBias(audioContext);

And it's ready to be used!

// Raise the frequency by 100
var oscillator = audioContext.createOscillator();
bias.gain.value = 100;
bias.connect(oscillator.frequency);

// Saturate/clip a "mixer"
var mixer = audioContext.createGain();
oscillator.connect(mixer);
bias.gain.value = 1;
bias.connect(mixer);
// the output of mixer is now half of the usual oscillator output as we've shifted it upwards by 1

Demo

Run npm install first to have all the dependencies (i.e. the oscilloscope component) installed.

Then open index.html. Code is in demo.js.

YOU NEED SUPPORT FOR WEB COMPONENTS IN YOUR BROWSER BECAUSE WE'RE NOT SHIMMING ANYTHING IN

Firefox: go to about:config, find dom.webcomponents.enabled and set it to true.

Chrome: maybe nothing to do?