DelayNode

DelayNode interface represents a delay-line ; an AudioNode audio-processing module that causes a delay between the arrival of an input data and its propagation to the output. A DelayNode always has exactly one input and one output, both with the same amount of channels.

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"

构造函数

DelayNode()
Creates a new instance of an DelayNode object instance. Alternatively, you can use the BaseAudioContext.createDelay() factory method.

特性

Inherits properties from its parent, AudioNode .

DelayNode.delayTime 只读
Is an a-rate AudioParam representing the amount of delay to apply, specified in seconds.

方法

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

范例

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.setValueAtTime(delay1, audioCtx.currentTime);
}
					

规范

规范 状态 Comment
Web 音频 API
The definition of 'DelayNode' in that specification.
工作草案

浏览器兼容性

更新 GitHub 上的兼容性数据
Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
DelayNode Chrome 14 Edge ≤18 Firefox 25 IE 不支持 No Opera 15 Safari 6 WebView Android Yes Chrome Android 18 Firefox Android 26 Opera Android 14 Safari iOS Yes Samsung Internet Android 1.0
DelayNode() 构造函数 Chrome 55
注意事项
55
注意事项
Before version 59, the default values were not supported.
Edge ≤79 Firefox 53 IE 不支持 No Opera 42 Safari ? WebView Android 55
注意事项
55
注意事项
Before version 59, the default values were not supported.
Chrome Android 55
注意事项
55
注意事项
Before version 59, the default values were not supported.
Firefox Android 53 Opera Android 42 Safari iOS ? Samsung Internet Android 6.0
注意事项
6.0
注意事项
Before Samsung Internet 7.0, the default values were not supported.
delayTime Chrome 14 Edge 12 Firefox 25 IE 不支持 No Opera 15 Safari 6 WebView Android Yes Chrome Android 18 Firefox Android 26 Opera Android 14 Safari iOS Yes Samsung Internet Android 1.0

图例

完整支持
完整支持
不支持
不支持
兼容性未知
兼容性未知
见实现注意事项。

另请参阅