jsdafx – Digital Audio Effects in JavaScript

Quantization, Dithering, and Noise Shaping

This script demonstrates audio effects resulting from Quantization. It is designed for a first insight into the perceptual effects of quantizing an audio signal.

The following options can be set in the lower part of the user interface

• Quantizer 
  • word length w leads to quantization step size Q=2⁻⁽ʷ⁻¹⁾
    
• Dither
  • rect dither - uniform probability density function
  • tri dither - triangular probability density function
  • high-pass dither - triangular probability density function and high-pass power spectral density
• Noise shaping
  • first-order H(z)=z⁻¹
  • second-order H(z)=-2z⁻¹+z⁻²
  • psychoacoustic noise shaping

You can choose between two predefined audio signals or your own local audio file to be processed.

Predefined music signal is licensed under CC-BY-3.0 by unfinite.