ITWissen.info - Tech know how online

Haas effect

The Haas effect is about the acoustic localization of sound sources, which takes place in the three planes front, back and top. The Haas effect, named after its originator and discoverer, is also referred to as the "law of the first wavefront" or the precedent effect. The idea is that sound sources are always localized according to the direction from which the first wavefront hits the auditory system.

In humans, the localization of sound sources occurs through the binaural system. Decisive for the localization of the sound location is the difference in propagation time that sound signals exhibit between the two ears. If the sound source is located in the middle in front of the listener, the signals do not have a difference in propagation time, since both ears are the same distance from the sound source. Nevertheless, even with monophonic sound, localization of the sound source is possible because certain frequency bands are shadowed by the auricle. However, the determination of the sound location is less precise than with stereophonic reproduction.

Time delay in localization of sound sources (Haas effect)

Time delay in localization of sound sources (Haas effect)

During localization, the time difference between the two ears, which is between 20 µs and 600 µs depending on head rotation, plays a decisive role, because the brain analyzes the time and level differences and derives the angle of incidence and the distance of the sound location from them.

Informations:
Englisch: Haas effect
Updated at: 20.07.2007
#Words: 228
Links: sound, system, indium (In), sound source, frequency (f)
Translations: DE
Sharing:    

All rights reserved DATACOM Buchverlag GmbH © 2024