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Original Articles

Classification of steady state gain reduction produced by amplitude modulation based noise reduction in digital hearing aids

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Pages 444-455 | Received 25 Apr 2008, Published online: 13 Aug 2009
 

Abstract

Digital noise reduction systems in modern digital hearing aids aim to improve either speech intelligibility or listening comfort. Little is known, however, about the actual gain reduction produced by different noise reduction systems. The aim of this study is to compare the gain reduction of different noise reduction systems.

We applied a systematic variation of different presentation levels of the input signal, different signal-to-noise ratios, and different target hearing loss configurations. The gain reduction of 12 different hearing aids was compared both qualitatively and quantitatively by means of principal value decomposition.

The results show that these hearing aids differ considerably in their responses. These differences are presented qualitatively by plotting contour maps that give the gain reduction as function of signal-to-noise-ratio and frequency. The quantitative analysis shows that the gain reduction produced by most hearing aids can be characterized by two transfer functions. The most important being an overall gain reduction. In addition to this, the frequency response is tilted to achieve either more low-frequency reduction and less high-frequency reduction, or the opposite.

Abbreviations
DNR=

Digital noise reduction

HF-band=

High-frequency band

IOI-HA=

International outcome inventory of hearing aids

ICRA=

International collegium of rehabilitative audiology

LF-band=

Low-frequency band

MF-band=

Mid-frequency band

SNR=

Signal-to-noise-ratio

Abbreviations
DNR=

Digital noise reduction

HF-band=

High-frequency band

IOI-HA=

International outcome inventory of hearing aids

ICRA=

International collegium of rehabilitative audiology

LF-band=

Low-frequency band

MF-band=

Mid-frequency band

SNR=

Signal-to-noise-ratio

Sumario

Los sistemas digitales de reducción de ruido en los auxiliares auditivos digitales modernos buscan mejorar la inteligibilidad del lenguaje o la comodidad al escuchar. Poco se sabe, sin embargo, sobre la reducción real de la ganancia producida por diferentes sistemas de reducción del ruido. El objetivo de este estudio fue comparar la reducción de la ganancia de diferentes sistemas de reducción de ruido.

Aplicamos una variación sistemática de diferentes niveles de presentación de la señal de ingreso, diferentes tasas de señal-ruido, y diferentes configuraciones meta de pérdida auditiva. La reducción de la ganancia de 12 auxiliares auditivos diferentes fue comparada tanto cualitativa como cuantitativamente por medio de descomposición del valor principal.

Los resultados muestran que estos auxiliares auditivos difirieron considerablemente en sus respuestas. Estas diferencias se presentan cualitativamente graficando mapas de contorno que muestran la reducción de la ganancia como una función de la tasa señal-ruido y la frecuencia. El análisis cuantitativo muestra que la reducción de la ganancia producida por la mayoría de los auxiliares auditivos puede caracterizarse por dos funciones de transferencia. La más importante resulta ser la reducción global de la ganancia. Además de esto, la respuesta de frecuencia se inclina para lograr, o más reducción en frecuencias graves o menos reducción en las frecuencias agudas, o lo opuesto.

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