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Waveguide Mesh Features • A mesh of such waveguides in 2D or 3D can simulate waves traveling in any direction in the space. • Analogy: tennis racket = rectilinear mesh of strings = pseudo-membrane • Wavefronts are explicitly simulated in all directions • True diffuse field in late reverb • Spatialized reflections are “free” • Echo density grows naturally with time • Mode density grows naturally with frequency • Low-frequency modes very accurately simulated • High-frequency modes mistuned due to dispersion (can be corrected) (often not heard) • Multiply free almost everywhere • Coarse mesh captures most perceptual details 46
Reverb Resources on the Web • Harmony Central article 2 (with sound examples) • William Gardner’s MIT Master’s thesis 3 2 http://www.harmony-central.com/Effects/<strong>Articles</strong>/Reverb/ 3 http://www.harmony-central.com/Computer/Programming/virtual-acoustic-room.ps.gz 47
Page 1 and 2: MUS420/EE367A Lecture 3 Artificial
Page 3 and 4: Implementation Let hij(n) = impulse
Page 5 and 6: Possibility of a Physical Reverb Mo
Page 7 and 8: Perception of Echo Density and Mode
Page 9 and 10: Proof that Mode Density Grows as Fr
Page 11 and 12: Perceptual Metrics for Ideal Reverb
Page 13 and 14: Energy Decay Relief (EDR) The energ
Page 15 and 16: x(n) Reverb = Early Reflections + L
Page 17 and 18: Desired Qualities: Late Reverberati
Page 19 and 20: Schroeder Allpass Sections (Late Re
Page 21 and 22: Are Allpass Filters Really Colorles
Page 23 and 24: • Schroeder suggests a progressio
Page 25 and 26: • d (“damping”) default: Free
Page 27 and 28: Freeverb Allpass Approximation Schr
Page 29 and 30: Choice of Orthogonal Feedback Matri
Page 31 and 32: Choice of Delay Lengths Mi • Dela
Page 33 and 34: u(n) b3 b2 b1 Choice of Loss Gains
Page 35 and 36: Example • Start with a pole at dc
Page 37 and 38: Lossy Mapping Let’s in more detai
Page 39 and 40: Desired Pole Radius Pole radius Rk
Page 41 and 42: Tonal Correction Filter Let hk(n) =
Page 43 and 44: Zita-Rev1 Damping Filters FDN rever
Page 45: Rectilinear Digital Waveguide Mesh

Articles - CCRMA - Stanford University

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