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

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.

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

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  1. EE 445S Real-Time Digital Signal Processing LabSpring 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

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