Only tones with periods in the 20-20,000 Hz range count as audioperiodic to listeners.

Evidence

A function that repeats itself only after a one-minute period may be periodic to a mathematician, but not to us in practice. Tones that have a period within our hearing range, 20 to 20,000 Hz, we shall call audioperiodic. — Eric J. Heller, Why You Hear What You Hear- An…, 348

Categorization

• DEFINE: Introduces ‘audioperiodic’ as the hearing-relevant criterion for periodicity.