Sound Synthesis Part III: Distortion-based synthesis (FM & Waveshaping) PlanDistortion-based synthesisFM synthesisWaveshapingMatlab code for synthesisExample of synthesized composition (Risset)SummaryTypes of synthesisDistortion (aka nonlinear) SynthesisAdditive synthesis is powerful & flexible BUT requires many simple oscillators.Plethoric and non-intuitive controls on the sound spectrum. Using fewer oscillators, with more components. Complex spectra can be obtained by distorting simple oscillators.PlanDistortion-based synthesisFM synthesisWaveshapingSubstractive synthesisSummaryFM SynthesisPioneered by John Chowning (1973) Alteration of distortion of the frequency of an oscillator in accordance with the amplitude of a modulating signal.Similar to Vibrato modulation, but using audible modulating frequency and larger width. Generate a large number of timbres easily controlled. FM Synthesis (2)Modulated frequency infc-d spectrogram( y, 256, 250, 250, fs )Can play sounds using the command: > sound( y, fs ) PlanDistortion-based synthesisFM synthesisWaveshapingMatlab code for synthesisExample of synthesized composition (Risset)SummaryPlanDistortion-based synthesisFM synthesisWaveshapingMatlab code for synthesisExample of synthesized composition (Risset)SummaryAdditional ReadingC. Dodge, C., & Jerse, T. A. (1997). Computer Music: Synthesis, Composition, and Performance. Schrimer, UK.(see chapters 5 and 6)Matlab examples for all sounds & instruments are available here: http://info.ee.surrey.ac.uk/Personal/N.Pugeault/MediacastingL3_2012/