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EE 445S Real-Time Digital Signal Processing Lab Spring 2012. Lab 7 Guitar Special Effects Chao Jia. Outline. Comb filters Allpass filters Notch filters Special effects with filters Other effects. Comb filters. FIR comb filter (single echo). Number of stopbands is R/2. Comb filters. - PowerPoint PPT Presentation
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EE 445S Real-Time Digital Signal Processing Lab
Spring 2012
Lab 7Guitar Special Effects
Chao Jia
2
Outline Comb filters Allpass filters Notch filters Special effects with filters Other effects
3
Comb filters FIR comb filter (single echo)
Number of stopbands is R/2
4
Comb filters IIR comb filter (multiple echoes)
5
Allpass filters
6
Notch filters
7
Some special effects Echo
FIR or IIR comb filters Delay > 100ms
Flanging FIR comb filter with (periodically)
varying delay Delay between 1ms and 10ms
8
Some special effects Chorus
Several independent comb filters
9
Some special effects Reverb
Mimic a enclosed space (lots of echoes)
10
Other effects Special effects can also be generated by
altering the amplitude of the signal. Tremolo
Repetitive up/down variation in the volume
Fuzz Intentionally introduced distortion like
clipping