Terhardt

Terhardt defined

• virtual pitch: charaterized by the presence of harmonics or near harmonics.
• spectral pitch: corresponding to individual audible pure-tone components.

Terhardt defines the crossover from virtual to spectral pitch to be at 800 Hz.

• for frequencies well above 1000 Hz the pitch frequency is heard only when the fundamental is actually present.

Most pitches we hear in normal sounds are virtual, whether fundamental is present or not.