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Original Article

Disturbance caused by varying propagation delay in non-occluding hearing aid fittings

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Pages 594-599 | Received 17 Jun 2003, Accepted 02 Dec 2003, Published online: 04 Feb 2013
 

Abstract

The disturbance caused by various short propagation delays to the perception of external sounds and own voice for a non-occluding hearing aid was investigated. Ten normal-hearing and 10 mildly hearing-impaired individuals listened to external sounds and their own voice while wearing non-occluding devices providing 10dB of linear gain. Participants rated the disturbance caused by delays of 2, 4 and 10ms to music, running speech, and their own voices. The results indicated greater disturbance for the longest delay for both subject groups when judging own voice, with the ratings of the hearing-impaired participants being lowest. Normal-hearing participants also judged the 10-ms delay as more disturbing for the external sounds. Owing to the listening conditions with constant gain from 800Hz and above, the results apply directly only to this experiment. Disturbance ratings for all delays were low, which suggests that any of those tested would be acceptable for this application.

Sumario

Se investigó la perturbación causada por varios retardos cortos de propagación en la perturbación de sonidos externos y de la propia voz con auxiliares auditivos no oclusivos. Diez individuos normo-oyentes y 10 con hipoacusia leve fueron expuestos a sonidos externos y a su propia voz utilizando auxiliares auditivos no oclusivos con ganacias lineales de 10dB. Los participantes estimaron las perturbaciones para retardos de 2, 4 y 10ms con música, lenguaje corrido y sus propias voces. Los resultados indicaron mayor perturbación para los retardos mayores en ambos grupos de sujetos cuando juzgaban su propia voz, siendo más bajos los puntajes de los hipoacúsicos. Los participates normo-oyentes también juzgaron el retardo de 10ms como más perturbante para los sonidos externos. Debido a las condiciones auditivas con ganancia constante por encima d 800Hz, los resultados aplican directamente sólo a este experimento. Las apreciones de la perturbación para todos los retardos fueron bajas, lo cuál sugiere que cualquiera de los retardos evaluados sería aceptable para este aplicación.

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