Function WindowFunction

dsp.js:1371–1417

(type, alpha)

function WindowFunction(type, alpha) {
  this.alpha = alpha;
 
  switch(type) {
    case DSP.BARTLETT:
      this.func = WindowFunction.Bartlett;
      break;
     
    case DSP.BARTLETTHANN:
      this.func = WindowFunction.BartlettHann;
      break;
     
    case DSP.BLACKMAN:
      this.func = WindowFunction.Blackman;
      this.alpha = this.alpha || 0.16;
      break;
   
    case DSP.COSINE:
      this.func = WindowFunction.Cosine;
      break;
     
    case DSP.GAUSS:
      this.func = WindowFunction.Gauss;
      this.alpha = this.alpha || 0.25;
      break;
     
    case DSP.HAMMING:
      this.func = WindowFunction.Hamming;
      break;
     
    case DSP.HANN:
      this.func = WindowFunction.Hann;
      break;
   
    case DSP.LANCZOS:
      this.func = WindowFunction.Lanczoz;
      break;
     
    case DSP.RECTANGULAR:
      this.func = WindowFunction.Rectangular;
      break;
     
    case DSP.TRIANGULAR:
      this.func = WindowFunction.Triangular;
      break;
  }
}

WindowFunction.prototype.process = function(buffer) {
  var length = buffer.length;