Filter bank system for hearing aids

Details Filter bank system for hearing aids Filter bank system for hearing aids

2009-05-18

2011-12-27

Choe, Henry (Department: 2817)

Electrical audio signal processing systems and devices

Hearing aids, electrical

Spectral control

C381S323000

Reexamination Certificate

active

08085960

ABSTRACT:
The object of the invention is to make sub-band processing in hearing aids less computationally intensive. For this purpose a filter bank system comprising an analysis filter bank (AFB) for decomposing an input signal into sub-band signals, a processing device for amplifying at least one of the sub-band signals, and a synthesis filter bank (SFB) for combining the processed sub-band signals into an output signal is provided. The sub-band signals are oversampled and downsampled compared to the input signal. The stopband attenuations of the individual filters of the AFB and SFB are at least as high as a predefined signal-to-noise ratio increased by an attenuation value which is a function of the oversampling factor, the downsampling factor and possibly the gain. The magnitude frequency response of the SFB is approximately matched to the magnitude frequency response of the AFB.

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“Dokumentation der Voruntersuchungen von Filterbänken zur Anwendung in Hörgeräten”; Arbeitsgruppe Digitale Sig0nalverarbeitung, Ruhr-Universitát Bochum im Auftrag der Firma Siemens Audiologische Technik GmbH; May 4, 2007; pp. 1-52.
Göckler et al., “Multiratensysteme—Abtastratenumsetzung und digitale Filterbänke”; Schlembach Fachverlag, Willburgstetten 2004 (Inhaltsverzeichnis); Book; 2004; Table of Contents pp. 1-3.
Kammeyer, Kroschel, Teubner Verlag, Stuttgart 2002, Chapter 4.3.5; 2002; pp. 106-107.

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