Abstract

An adaptive beamformer for behind-the-ear dual-microphone hearing aids has been optimized for speech intelligibility enhancement in the presence of disturbing sounds or noise. The noise reduction approach is based on the scheme presented by Vanden Berghe and Wouters (1998). A real-time implementation of the signal processing is realized in Audallion, a wearable, small digital signal processing (DSP) platform. After physical evaluation, speech-in-noise intelligibility tests have been carried out on three normally-hearing and two hearing-impaired subjects. A significant speech reception threshold improvement of 11.3 dB was obtained in a moderately reverberant environment for one jammer sound source (steady speech-weighted noise or multi-talker babble) in a direction of 90° relative to the direction of the speech.SumarioSe perfeccionó el formador de haz adaptable para el micrófono dual de los auxiliares auditivos tipo curveta, con el fin de mejorar la inteligibilidad en ambiente ruidoso. El enfoque para disminuir el ruido está basado en el esquema presentado por Vanden Berghe y Wouters (1998). Se realizó un procesamiento de señal en tiempo real en Audillion, una pequeña plataforma de procesamiento digital de señal (DSP). Después de una evaluación fisica, se llevaron a cabo pruebas de inteligibilidad del lenguaje en ambiente ruidoso en tres sujetos normoyentes y dos hipoacúsicos. Se obtuvo una mejoria significativa en el umbral de recepción del habla de 11.3dB, en un ambiente moderadamente reverberante para una fuente de interferencia (ruido de habla estable o balbuceo multiple) en una dirección de 90° en relación con la dirección del lenguaje

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