Decay of non-harmonics

The previous analysis describes the attenuation due to ``propagation'' around the loop.

Sinusoids that do not ``fit'' into the loop, are quicky destroyed by self interference.

Figure 17: Destructive interference occurs at odd harmonics of the fundamental frequency.

Though the loop is initialized with random numbers, after a very short time the primary frequencies remaining in the loop are those with an integer number of periods in N + 1/2 samples.