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• W2022275097 abstract "The effects of low-frequency expansion on the objective and subjective evaluation of four channel in-the-ear hearing instruments was investigated. Three expansion settings were programmed in each device: expansion off, expansion restricted to channel one, and expansion restricted to channels one and two. Objective evaluations were conducted in quiet (Connected Speech Test) and in noise (Hearing in Noise Test) with speech levels fixed at 40 dB SPL. Subjectively, each participant rated expansion satisfaction in quiet and listening to low-level speech in a sound-treated room then indicated the expansion condition preferred overall. Listeners performed significantly better in quiet and in noise for the Off and Channel 1 conditions than the Channels 1 and 2 condition; however, performance was similar between the Off and Channel 1 conditions. Expansion effects on listener satisfaction ratings depended on the listening environment. Overall, listeners preferred expansion in Channel 1 to expansion in Channels 1 and 2; however, preference was not significantly different between the Channel 1 and Off conditions. Results indicate restricting expansion to 1000 Hz overcomes speech-recognition deficits observed with expansion active across a broader spectrum without significantly reducing subjective benefit or preference. Se investigaron los efectos de la expansión en las frecuencias graves sobre la evaluación objetiva y subjetiva de instrumentos auditivos intra-auriculares de cuatro canales. Se programaron cuatro ajustes de expansión en cada dispositivo: expansión apagada, expansión restringida al canal uno, y expansión restringida a los canales uno y dos. Se condujeron evaluaciones objetivas en silencio (Prueba de Lenguaje Conectado) y en ruido (Prueba de Audición en Ruido) con los niveles de lenguaje fijos a 40 dB SPL. Subjetivamente, cada participante calificó la satisfacción en cuanto a la expansión en silencio y escuchando lenguaje a bajo volumen en una cabina sono-amortiguada, y luego expresó la condición de expansión preferida sobre las demás. Los sujetos funcionaron significativamente mejor en silencio y en ruido para las condiciones de apagado y canal 1 que para la condición de canales 1 y 2; sin embargo, el desempeño fue similar entre las condiciones de apagado y canal 1. Los efectos de la expansión sobre la calificación de la satisfacción de los sujetos dependieron del ambiente de escucha. Globalmente, los sujetos prefirieron la expansión en el canal 1 y en los canales 1 y 2; sin embargo, la preferencia no fue significativamente diferente entre la condición de canal 1 y apagado. Los resultados indican que la restricción en la expansión a 1000 Hz compensa las deficiencias en el reconocimiento del lenguaje observada con una expansión activa a lo largo de un espectro más amplio, sin reducir significativamente el beneficio subjetivo o la preferencia." @default.
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• W2022275097 date "2007-09-01" @default.
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• W2022275097 title "The Objective and Subjective Evaluation of Low-Frequency Expansion in Wide Dynamic Range Compression Hearing Instruments" @default.
• W2022275097 doi "https://doi.org/10.3766/jaaa.18.8.2" @default.
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