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    AudioBuffer.sampleRate

    The sampleRate property of the AudioBuffer interface returns a float representing the sample rate, in samples per second, of the PCM data stored in the buffer.

    Syntax

    var myArrayBuffer = audioCtx.createBuffer(2, frameCount, audioCtx.sampleRate);
    myArrayBuffer.sampleRate;

    Value

    A float.

    Example

    // Stereo
    var channels = 2;
    
    // Create an empty two second stereo buffer at the
    // sample rate of the AudioContext
    var frameCount = audioCtx.sampleRate * 2.0;
    var myArrayBuffer = audioCtx.createBuffer(2, frameCount, audioCtx.sampleRate);
    
    button.onclick = function() {
      // Fill the buffer with white noise;
      // just random values between -1.0 and 1.0
      for (var channel = 0; channel < channels; channel++) {
        // This gives us the actual ArrayBuffer that contains the data
        var nowBuffering = myArrayBuffer.getChannelData(channel);
        for (var i = 0; i < frameCount; i++) {
          // Math.random() is in [0; 1.0]
          // audio needs to be in [-1.0; 1.0]
          nowBuffering[i] = Math.random() * 2 - 1;
        }
      }
    
      console.log(myArrayBuffer.sampleRate);
    }

    Specification

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

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
    Basic support 14 webkit 23 Not supported 15 webkit
    22 (unprefixed)
    6 webkit
    Feature Android Chrome Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile
    Basic support Not supported 28 webkit 25 1.2 Not supported Not supported webkit

    See also

    Document Tags and Contributors

    Contributors to this page: fscholz, chrisdavidmills
    Last updated by: fscholz,