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US 11,310,607 B2Granted
Method of operating a hearing aid system and a hearing aid system
AssigneeWidex A/S
InventorsThomas Bo Elmedyb, Lars Dalskov Mosgaard, Michael Johannes Pihl, Georg Stiefenhofer, Pejman Mowlaee, Adam Westermann
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Abstract
A method of operating a hearing aid system comprising a hearing aid (300) wherein a digital filter (302) is adapted to be of minimum phase and to provide a frequency dependent target gain.
Claims14
A method of operating a hearing aid system comprising the steps of:
- analyzing an input signal in order to provide a frequency dependent target gain that is adapted to at least one of suppressing noise, enhancing a target sound, customizing the sound to a user preference and alleviating a hearing deficit of an individual wearing the hearing aid system;
- determining the real cepstrum of the frequency dependent target gain;
- using the real cepstrum of the frequency dependent target gain to provide a desired minimum phase filter impulse response;
- updating a digital filter, configured to provide the frequency dependent target gain, to provide the desired minimum phase filter impulse response,
- wherein at least one of the steps of:
- determining the real cepstrum of the frequency dependent target gain, and using the real cepstrum of the frequency dependent target gain to provide a desired minimum phase filter impulse response,
- is carried out by applying at least one of a discrete cosine transformation and a discrete sine transformation.
4 more elements
A hearing aid (300) comprising, in a main signal branch:
- an acoustical-electrical input transducer (301), a main digital filter (302) and an electrical-acoustical output transducer (303);
- and comprising, in an analysis signal branch:
- an analysis filter bank (304), a frequency dependent target gain calculator (305), a natural logarithm calculator (306), a smoothing filter (307), a discrete cosine transformation circuit (308), a cepstrum domain window (309), a discrete sine transformation circuit (310), a digital combiner (311), an exponential calculator (312), a minimum phase filter transfer calculator (313), a minimum phase impulse response calculator (314) and a main digital filter coefficient calculator (315).
Dependencies are inferred from the claim text.