Outdoor wall and ground reflections produce repetition pitch in real settings.

Evidence

Repetition pitch often occurs outdoors, where a noisy sound is reflected from a wall or from hard ground and is summed to the direct sound in the ear canals. Relatively often it is simply perceived as colouring of sound and not as pitch. However, if the delay changes with time, as when the source or the receiver moves, the pitch is perceived more prominently. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1112

Categorization

• XREF: Connects to the reader’s ongoing soundscape work — real-world acoustic reflection phenomena in outdoor environments.