Comb filter

When a sound is mixed with a delayed version of itself, each sinusoidal component of the delayed sound has a unique phase offset compared to the original, so each frequency is accentuated or attenuated differently. For example, if a 1000 Hz sinusoid is delayed by 1/1000 of a second (1 millisecond), the original and the delayed version will still be perfectly in phase, so that frequency will be increased in amplitude when the two versions are added together.

Simple wavetable synthesis

One of the earliest methods of digital sound synthesis was a digital version of the electronic oscillator, which was the most common sound generator in analog synthesizers. The method used was simply to read repeatedly, at the established sample rate, through a stored array of samples that represent one cycle of the desired sound wave. By changing the step size with which one increments through the stored wavetable, one can alter the number of cycles one completes per second, which will determine the perceived fundamental frequency of the resulting tone.

Phase distortion synthesis in a poly~ subpatch

This shows an implementation of phase distortion synthesis in MSP—using the phasor~, kink~, and cycle~ objects—in a patch that is designed to be used inside the poly~ object. For an explanation of this sort of phase distortion synthesis, see “A demonstration of phase distortion synthesis.” The main point of this example, though, is to show how a synthesis patch can be designed to respond directly to MIDI input.