MUS420/EE367A Lecture 4B
Time Varying Delay Effects

Julius O. Smith III ( send email ), Stefania Serafin,
Jonathan S. Abel, and David P. Berners

Center for Computer Research in Music and Acoustics (CCRMA)
Department of Music, Stanford University
Stanford, California 94305

Detailed Contents (and Navigation)

• Variable Delay Line
  • Variable Delay Line Applications
  
  
• Flanging
• Flanging Model
  • Feed-Forward Comb-Filter Amplitude Response
  • Summary of Flanging
  
  
• Phasing
  • First-Order Allpass Filter Section
  • Four First-Order Analog Allpass Filters
  
  
• Vibrato Simulation
• Doppler Effect
  • Doppler Shift Formula
  • Vector Formulation
  • Velocity Projection
  • Doppler Simulation
  • Doppler Simulation via Delay Lines
  • Time-Varying Delay-Line Reads
  • Multiple Read/Write Pointers
  • Stereo Multiple-Moving-Source Simulation
  
  
• Chorus Effect
• The Leslie
  • Inside the Leslie
  • Leslie Operation
  • Rotating Horn Simulation
  • Rotating Horn Doppler Shift
  • Rotating Horn Doppler Shift, Cont'd
  
  
• Computational Modeling of the Leslie
  • Leslie Free-Field Horn Measurements
  • Measured impulse responses
  • Measured amplitude responses
  • Separating Horn Output from Base Leakage
  • Algorithm
  • Results
  • Results, Cont'd
  • Spectrogram versus Frequency and Angle
  • Sound Examples
  • Reference
  
  
• About this document ...