Ohorisonten

Ohorisonten is a concept in acoustics and psychoacoustics describing the audible boundary of the environment, defined as the maximum distance at which a sound source remains perceptible under given conditions. It mirrors the visual horizon but for auditory perception, and is influenced by both the properties of the sound and the surrounding environment.

The term has appeared in acoustic ecology and urban soundscape research in the 21st century, used to describe how far sounds travel and remain distinguishable in real-world settings. Researchers estimate it through controlled experiments using calibrated sound sources at increasing distances, as well as field observations with psychoacoustic testing and directional recording.

Several factors affect the ohorisonten: source level and spectral content, atmospheric conditions such as temperature and humidity, wind, ground and vegetation, terrain, and background noise. Urban environments with reflective surfaces and masking sounds can shorten it, while open rural areas and favorable weather can extend it. Seasonal changes and terrain heterogeneity also alter attenuation and scattering of sound.

Applications include urban and architectural acoustics for designing quiet outdoor spaces, soundscape planning, and virtual reality or simulation work where the perceived extent of environmental sounds informs realism. It also has relevance for hearing aid and cochlear implant research, where understanding the effective auditory horizon can influence device algorithms and user experience.

See also: psychoacoustics, sound propagation, soundscape, horizon.