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Digital Waveform Generation by Pete Symons

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6 Dynamic waveshape and spectrum control

In this chapter we investigate several techniques for generating waveforms with time-varying waveshape and corresponding spectrum. We consider three distinct techniques which are inherently compatible with the DDS model:

  • paged wavetable access – where a contiguous sequence of waveform functions is tabulated in memory and accessed sequentially according to a time-varying waveshape (or spectrum) parameter;
  • linear wavetable combination – where multiple wavetables that each tabulate different waveform functions are linearly combined according to a time-varying parameter;
  • modulation – where the frequency, phase or amplitude of a typically sinusoidal carrier waveform is modulated by a modulator waveform.

Paged wavetable ...

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