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Human echolocation in different situations and rooms: Threshold values Architectural Acoustics: Paper 1aAAa1
KTH, SWE.
Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
2017 (engelsk)Inngår i: Proceedings of Meetings on Acoustics, Acoustical Society of America , 2017, nr 1Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

People, especially when blind, use echolocation to detect obstacles, orient themselves and get an awareness of their environment. Echolocation describes how people use reflected sounds to obtain information about their ambient world. Echolocation with long canes while walking is possible but difficult. Different spectral composition of the emitted sounds from canes had no differential effects. Sound recordings in anechoic and conference rooms from non-walking, static situations, later presented in a laboratory showed a better performance in an ordinary room with reflections, than in an anechoic room. Longer sounding sounds resulted in a higher performance than short clicks. Among the difficulties for the blind are how to avoid masking of sounds. There may exist a time gap, acoustic gaze, for how blind people use clicks. The results of previous studies were reanalyzed by using auditory models. Thresholds based on local non-parametric fitting, were determined for distance, pitch, loudness and sharpness. The blind had overall a more sensitive threshold than sighted persons. A few blind are exceptionally high performing. An information-surplus principle' has been proposed. Various information sources are used, but repetition pitch seems more important than loudness for echolocation. Among other sources, timbre may also provide information. © 2017 Acoustical Society of America.

sted, utgiver, år, opplag, sider
Acoustical Society of America , 2017. nr 1
Emneord [en]
Architectural acoustics, Auditory models, Conference rooms, Differential effect, Information sources, Non-parametric, Ordinary rooms, Reflected sounds, Spectral composition, Sonar
HSV kategori
Identifikatorer
URN: urn:nbn:se:bth-15515DOI: 10.1121/2.0000536Scopus ID: 2-s2.0-85030161852OAI: oai:DiVA.org:bth-15515DiVA, id: diva2:1163450
Konferanse
173rd Meeting of Acoustical Society of America, Acoustics 2017 and 8th Forum Acusticum, Boston
Tilgjengelig fra: 2017-12-07 Laget: 2017-12-07 Sist oppdatert: 2017-12-07bibliografisk kontrollert

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