Phasing

As mentioned in §3.4.2, the phaser, or phase shifter works by sweeping notches through a signal's short-time spectrum. The notches are classically spaced nonuniformly. In this section, we look at using a chain of allpass filters to implement the phasing effect.

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Subsections

• Phasing with First-Order Allpass Filters
  • Classic Analog Phase Shifters
  • Classic Virtual Analog Phase Shifters
  
  
• Phasing with 2nd-Order Allpass Filters
  • Allpass Phaser Architecture
  • Allpass Phaser Parameters
  • Allpass Phaser Notch Distribution

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written by Julius Orion Smith III
Julius Smith's background is in electrical engineering (BS Rice 1975, PhD Stanford 1983). He is presently Professor of Music and Associate Professor (by courtesy) of Electrical Engineering at Stanford's Center for Computer Research in Music and Acoustics (CCRMA), teaching courses and pursuing research related to signal processing applied to music and audio systems. See http://ccrma.stanford.edu/~jos/ for details.