FDN Reverberation

Feedback Delay Networks (FDN) were introduced earlier in §2.7. An example is shown in Fig.2.29 on page . After a brief historical summary, this section will cover some practical considerations for the use of FDNs as reverberators.

• History of FDNs for Artificial Reverberation
• Choice of Lossless Feedback Matrix
  • Hadamard Matrix
  • Householder Feedback Matrix
  • Householder Reflections
  • Most General Lossless Feedback Matrices
  • Triangular Feedback Matrices
  
  
• Choice of Delay Lengths
  • Mean Free Path
  • Mode Density Requirement
  • Prime Power Delay-Line Lengths
  
  
• Achieving Desired Reverberation Times
  • Conformal Map Interpretation of Damping Substitution
  • Damping Filters for Reverberation Delay Lines
  
  
• Delay-Line Damping Filter Design
  • First-Order Delay-Filter Design
  • Orthogonalized First-Order Delay-Filter Design
  • Multiband Delay-Filter Design
  
  
• Spectral Coloration Equalizer
• Tonal Correction Filter
• FDNs as Digital Waveguide Networks
• FDN Reverberators in Faust
• Zita-Rev1
  • Zita-Rev1 Delay-Line Filters
  
  
• Further Extensions
  • Spatialization of Reverberant Reflections
  • Distribution of Mode Frequencies
  • Digital Waveguide Reverberators
  • The Digital Waveguide Mesh for Reverberation
  • Time Varying Reverberators