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Coding Strategies for Multichannel Wiener Filters in Binaural Hearing Aids

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Binaural hearing aids use sound spatial techniques to increase intelligibility, but the design of the algorithms for these devices presents strong constraints. To minimize power consumption and maximize battery life, the digital signal processors embedded in these devices have very low frequency clocks and low amount of available memory. In the binaural case the wireless communication between both hearing devices also increases the power consumption, making necessary the study of relationship between intelligibility improvement and required transmission bandwidth. In this sense, this paper proposes and compares several coding strategies in the implementation of binaural multichannel Wiener filters, with the aim of keeping minimal communication bandwidth and transmission power. The obtained results demonstrate the suitability of the proposed coding strategies.

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