Lecture 2
Digital Sound, Additive and Wavetable Synthesis
Lecture Slides
A series of gif images of the lecture slides... (sorry, only accesible from within Stanford University)
Digital Sound
- Sound representation
- Transducers
- ADC and DAC converters
- Sampling theorem (Nyquist)
- Aliasing
- Quantization
Additive and Wavetable Synthesis
Periodic waveform synthesis
f(t)=sum,k=0,...(Ak*sin(kwt+Qk)) [Moore 210]
Partial based synthesis
f(t)=sum,k=0,...(Ak*sin(wkt+Qk)) [Moore 210]
Time varying synthesis
Ak=f(t)
Wk=f(t)
Qk=f(t)
Examples
- A very simple wavetable instrument (wavetable.ins)
- A very simple three partial additive instrument (additive.ins)
- The frequency sweep instrument used for the aliasing examples (sweep.clm)
You can play around with the WaveEdit.app application (implements real time wavetable synthesis, very nice to get the concept of time and frequency domains)
Another nice application is Spectro.app, a soundfile analysis tool.
Assignment
Create a CLM instrument that can interpret and play the steady state spectral data that is part of "/Lisp/clm/spectr.clm".
