BaseAudioContext: createDelay() method

The createDelay() method of the BaseAudioContext Interface is used to create a DelayNode, which is used to delay the incoming audio signal by a certain amount of time.

Syntax

createDelay(maxDelayTime)

Parameters

maxDelayTime Optional

The maximum amount of time, in seconds, that the audio signal can be delayed by. Must be less than 180 seconds, and defaults to 1 second if not specified.

Return value

A DelayNode. The default DelayNode.delayTime is 0 seconds.

Examples

We have created an 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.

const audioCtx = new AudioContext();

const synthDelay = audioCtx.createDelay(5.0);

// …

let synthSource;

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

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

// …

let delay1;
rangeSynth.oninput = () => {
  delay1 = rangeSynth.value;
  synthDelay.delayTime.setValueAtTime(delay1, audioCtx.currentTime);
};

Specifications

Browser compatibility

See also

• Using the Web Audio API