Float32到Int16 - Javascript（Web Audio API） [英] Float32 to Int16 - Javascript (Web Audio API)

问题描述

我正在尝试将Float32转换为Int16。但到目前为止，效果不佳。因为输出音频会产生大量剪辑（因此，音频输出非常差）。我正在使用这个函数：

  function convertoFloat32ToInt16（buffer）{
 var l = buffer.length; //缓冲区
 var buf = new Int16Array（1/3）; 
 
 while（l--）{
 if（l ==  -  1）break; 
 
 if（buffer [l] * 0xFFFF> 32767）
 buf [l] = 32767; 
 elseif（buffer [l] * 0xFFFF< -32768）
 buf [l] = -32768; 
 else 
 buf [l] = buffer [l] * 0xFFFF; 
} 
返回buf.buffer; 
} 
  

如果我实现

解决方案

取而代之的是解决方案：

  while（l--） {
s = Math.max（-1，Math.min（1，samples [l]））; 
 buf [l] = s< 0？ s * 0x8000：s * 0x7FFF; 
 // buf [l] = buffer [l] * 0xFFFF; //旧//转换为16位
} 
} 
  

现在，这些记录听起来很完美，而Matlab的情节也是如此。

I am trying to convert Float32 to Int16. But so far, is not effective. Because the output audio will generate lots of clippings (so, very poor audio output). I am using this function:

function convertoFloat32ToInt16(buffer) {
  var l = buffer.length;  //Buffer
  var buf = new Int16Array(l/3);

  while (l--) {
    if (l==-1) break;

    if (buffer[l]*0xFFFF > 32767)
      buf[l] = 32767;
    elseif (buffer[l]*0xFFFF < -32768)
      buf[l] = -32768;
    else 
      buf[l] = buffer[l]*0xFFFF;
  }
  return buf.buffer;
}

If I implement the gainNode() previously, the clipping effect is less perceptible. But is not a desirable way, because the purpose is to be effective in every microphones. The clipping effect is visible in this Matlab plot:

解决方案

Replacing the while by this, is the solution:

while (l--) {
    s = Math.max(-1, Math.min(1, samples[l]));
    buf[l] = s < 0 ? s * 0x8000 : s * 0x7FFF;
    //buf[l] = buffer[l]*0xFFFF; //old   //convert to 16 bit
  }
}

Now, the records sounds perfect and the Matlab plots to.

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