Sivantos Pte. Ltd.

Siemens Medical Instruments Pte. Ltd.

Wolfgang Soergel

Henning Puder

Rainer Martin

Thomas Pilgrim

Timo Gerkmann

Alexander Schasse

A hearing apparatus that processes an audio signal by adaptive filtering operates efficiently. The hearing apparatus has a first stage transformation unit and at least two second stage transformation units. Each of the second stage transformation units splits the signal of one of the first stage channels through transformation onto sub-channels of the channel. A filter unit in each channel that has a second stage transformation unit filters the signal of the channel depending on weighting factors that are determined in each case for the sub-channels. The filter units are configured to exchange weighting factors among themselves, which means that only some of the weighting factors actually need to be calculated.

Hearing apparatus having an adaptive filter and method for filtering an audio signal

A filter bank with a sufficiently high resolution for amplification and noise reduction and with the lowest possible computational complexity is provided for a hearing device and, in particular, for a hearing aid. Two-stage frequency transformation with little latency is therefore proposed for hearing aids. Some of the processing, for example the amplification, is carried out after high stopband attenuation in the first stage. An increased frequency resolution is achieved in a second stage before the back-transformation in the first stage, which is favorable for noise reduction, for example.

Hearing device and method for operating a hearing device with two-stage transformation

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Erlangen, Germany

Wolfgang Soergel