Computer Sound Synthesis 2 MUS_TECH 335 Selected Topics

David Griesinger Lexicon modulating delays in reverb

Lexicon-Style Reverb Predelay lowpass filters All-pass Combs Diffusion Modulated All-pass Delay All-pass low-pass filter

Building Blocks z -1 1-b  b   x x 1 st -order recursive filter (low-pass) all-pass comb filters

Modulating Delay   908+Excursion Modulation rate ~ 1 Hz Excursion ~ 0.3 msec ( )

Temporal Diffusion tinput a toutput a more than 10 msec

Waveguide Reverberation Julius Smith Other Methods for Creating Reverberation We can discuss later when covering waveguides

Feedback Matrix A Strautner & Puckette 1982 Jot & Chaigne 1991

Generic Effects Processor delay tone inputoutput output mix feedback feedback phase +/- 1 1 st order ??? ~ speed width on/off delay modulation

Control Signals/Modulators t a +1 * deviation + centerValue = a deviation centerValue t

“Flanging” delay.5 +1 metallic, zingy -1 whoosh, hollow +/- 1 delay 5 ms 200 Hz 20 ms 50 Hz

Chorusing delay modulation controls msec inout

Panning and Positioning

Panning Methods 0.5 L (C) R amp position 0.7 L (C) R amp position Amplitude Panning Intensity or Power Panning

Panning Methods Near-field Monitoring: Greatest accuracy: Low Frequencies: amplitude panning High Frequencies: power panning Large-space Monitoring: power panning

Panning Inaccuracy L (C) R High position Low