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Original Articles

Digital noise reduction: Outcomes from laboratory and field studies

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Pages 447-460 | Received 09 Feb 2007, Published online: 07 Jul 2009
 

Abstract

The purpose of this study was to determine the impact of a digital noise reduction (DNR) scheme implemented in a current commercial hearing aid. In a double-blinded design, three conditions of onset time (4, 8, 16 seconds) were randomly assigned to the 25 subjects, plus one condition wherein the noise-reduction feature was disengaged. Subsequently, a fifth trial/condition, wherein the subject had access to three memories in which the different onsets were programmed, was carried out. For each of the five conditions, the subjects had an at-home trial, prior to obtaining self-report measures. Laboratory measures of speech perception showed no effect of the DNR, with or without the provision of visual cues. Laboratory-based ratings of ease of listening showed DNR-on (all onset times) to be rated significantly better than DNR-off; for ratings of listening comfort, the 4-second onset time was rated significantly lower (poorer) than the 8-second onset or the DNR-off condition; for ratings of sound quality, DNR-on or -off had no differential effect. Self-report measures indicated significantly higher aversiveness in the DNR-off condition compared to the pre-test scores

Abbreviations
ANL=

Acceptable noise levels

AO=

Auditory only

A + V=

Auditory + visual

AV=

Aversiveness to sound

BN=

Background noise

DNR=

Digital noise reduction

EC=

Ease of communication

RV=

Reverberation

SNR=

Signal-to-noise ratio

SRT=

Speech reception thresholds

TD=

Threshold of discomfort

Abbreviations
ANL=

Acceptable noise levels

AO=

Auditory only

A + V=

Auditory + visual

AV=

Aversiveness to sound

BN=

Background noise

DNR=

Digital noise reduction

EC=

Ease of communication

RV=

Reverberation

SNR=

Signal-to-noise ratio

SRT=

Speech reception thresholds

TD=

Threshold of discomfort

Sumario

El propósito de este estudio fue determinar el impacto de un esquema de reducción digital del ruido (DNR) implementado en un auxiliar auditivo comercial actual. Con un diseño doble ciego, se asignaron al azar tres condiciones de tiempo (4, 8 y 16 segundos) a 25 sujetos, además de una condición en la que se desconectó la reducción de ruido. Subsecuentemente se llevó a cabo una quinta condición de prueba en la que el sujeto tuvo acceso a tres memorias, en las cuales se programaron los tiempos de presentación. Para cada una de las cinco condiciones, los sujetos tuvieron una prueba en su casa, antes de obtener las mediciones auto reportadas. Las medidas de percepción del habla en el laboratorio no mostraron efectos del DNR, con o sin la provisión de claves visuales. Las puntuaciones de facilidad de escucha basadas en el laboratorio mostraron que con el DNR (con todos los tiempos de presentación) eran significativamente mejores que con la desconexión del DNR; para las puntuaciones de escucha confortable el tiempo de 4 segundos fue significativamente más bajo (más pobre) que con 8 segundos de las condiciones del DNR; para puntuaciones de calidad de sonido con o sin DNR no hubo efectos diferenciales. Los reportes de autoevaluación indicaron una aversión significativamente mayor en la condición de bloqueo del DNR, en comparación con las puntuaciones previas a la prueba.

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