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L'interfaccia DelayNode rappresenta una linea di ritardo (linea di delay); è un modulo di elaborazione audio che provoca appunto un ritardo tra l'arrivo di un dato di ingresso e la sua propagazione verso l'uscita. Un DelayNode ha sempre esattamente un ingresso e un uscita, entrambi con lo stesso numero di canali.

The DelayNode acts as a delay-line, here with a value of 1s.

When creating a graph that has a cycle, it is mandatory to have at least one DelayNode in the cycle, or the nodes taking part in the cycle will be muted.

Number of inputs 1
Number of outputs 1
Channel count mode "max"
Channel count 2 (not used in the default count mode)
Channel interpretation "speakers"

Constructor

DelayNode()
Creates a new instance of an DelayNode object instance.

Properties

Inherits properties from its parent, AudioNode.

DelayNode.delayTime Read only
Is an a-rate AudioParam representing the amount of delay to apply.

Methods

No specific methods; inherits methods from its parent, AudioNode.

Example

We have created a simple example that allows you to play three different samples on a constant loop — see create-delay (you can also view the source code). If you just press the play buttons, the loops will start immediately; if you slide the sliders up to the right, then press the play buttons, a delay will be introduced, so the looping sounds don't start playing for a short amount of time.

var AudioContext = window.AudioContext || window.webkitAudioContext;
var audioCtx = new AudioContext();

var synthDelay = audioCtx.createDelay(5.0);

  ...

var synthSource;

playSynth.onclick = function() {
  synthSource = audioCtx.createBufferSource();
  synthSource.buffer = buffers[2];
  synthSource.loop = true;
  synthSource.start();
  synthSource.connect(synthDelay);
  synthDelay.connect(destination);
  this.setAttribute('disabled', 'disabled');
}

stopSynth.onclick = function() {
  synthSource.disconnect(synthDelay);
  synthDelay.disconnect(destination);
  synthSource.stop();
  playSynth.removeAttribute('disabled');
}

...

var delay1;
rangeSynth.oninput = function() {
delay1 = rangeSynth.value;
synthDelay.delayTime.value = delay1;
}

Specifications

Specification Status Comment
Web Audio API
The definition of 'DelayNode' in that specification.
Working Draft  

Browser compatibility

  
Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 10.0webkit (Yes) 25.0 (25.0)  No support 15webkit
22 (unprefixed)
6.0webkit
constructor 55.0 ? 53.0 (53.0)  ? 42 ?
Feature Android Android Webview Edge Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support No support (Yes) (Yes) 26.0 ? (Yes) ? 33.0
constructor No support 55.0 ? 53.0 (53.0)  ? 42 ? 55.0

See also

Tag del documento e collaboratori

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