EE 445S Real-Time Digital Signal Processing Lab Spring 2012

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Presentation transcript:

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 IIR comb filter (multiple echoes)

Allpass filters

Notch filters

Some special effects Echo FIR or IIR comb filters Delay > 100ms Flanging FIR comb filter with (periodically) varying delay Delay between 1ms and 10ms

Some special effects Chorus Several independent comb filters

Some special effects Reverb Mimic a enclosed space (lots of echoes)

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