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Articles

The effect of extending high-frequency bandwidth on the Acceptable Noise Level (ANL) of hearing-impaired listeners

, &
Pages 353-362 | Received 24 Jun 2008, Published online: 21 Jul 2009
 

Abstract

This study examined the effects of extending high-frequency bandwidth, for both a speech signal and a background noise, on the acceptable signal-to-noise ratio (SNR) of listeners with mild sensorineural hearing loss through utilization of the Acceptable Noise Level (ANL) procedure. In addition to extending high-frequency bandwidth, the effects of reverberation time and background noise type and shape were also examined. The study results showed a significant increase in the mean ANL (i.e. participants requested a better SNR for an acceptable listening situation) when high-frequency bandwidth was extended from 3 to 9 kHz and from 6 to 9 kHz. No change in the ANL of study participants was observed as a result of isolated modification to reverberation time or background noise stimulus. An interaction effect, however, of reverberation time and background noise stimulus was demonstrated. These findings may have implications for future design of hearing aid memory programs for listening to speech in the presence of broadband background noise.

Abbreviations
ANL=

Acceptable Noise Level

MCL=

Most comfortable level

PSL=

Prescribed speech level

BNL=

Background noise level

SNR=

Signal-to-noise ratio

SPIN=

Speech perception in noise

ms=

Millisecond

kHz=

Kilohertz

dB=

Decibel

HL=

Hearing level

SPL=

Sound pressure level

ANOVA=

Analysis of variance

Abbreviations
ANL=

Acceptable Noise Level

MCL=

Most comfortable level

PSL=

Prescribed speech level

BNL=

Background noise level

SNR=

Signal-to-noise ratio

SPIN=

Speech perception in noise

ms=

Millisecond

kHz=

Kilohertz

dB=

Decibel

HL=

Hearing level

SPL=

Sound pressure level

ANOVA=

Analysis of variance

Abstract

Este estudio examinó los efectos de la extensión del ancho de banda de frecuencias agudas tanto del lenguaje como del ruido de fondo, en el rango aceptable de relación señal/ruido (SNR) de personas con pérdidas auditivas sensorineurales superficiales, por medio del uso de un procedimiento de ruido aceptable (ANL). Además de la extensión del ancho de banda de frecuencias agudas, se examinaron también los efectos del tiempo de reverberación y del tipo y perfil del ruido de fondo. Los resultados del estudio mostraron un aumento significativo del ANL medio (p.e. los participantes pidieron el mejor SNR para una situación de escucha aceptable), cuando el ancho de banda de frecuencias agudas se extendió de 3 a 9 kHZ y de 6 a 9 kHz. No se observó ningún cambio en el ANL de los participantes del estudio como resultado de una modificación aislada del tiempo de reverberación o del estímulo de ruido de fondo. Sin embargo, se demostró un efecto de interacción del tiempo de reverberación y del ruido de fondo. Estos hallazgos pueden tener implicaciones para el diseño futuro de programas de memoria de los auxiliares auditivos para escuchar lenguaje en presencia de ruido de fondo de banda ancha.

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