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US 11,146,897 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, Pejman Mowlaee, David Pelegrin-Garcia
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Abstract
A method of operating a hearing aid system in order to provide improved performance for a multitude of hearing aid system processing stages and a hearing aid system (400) for carrying out the method.
Claims22
A method of operating a hearing aid system comprising the steps of:
- providing a first and a second input signal, wherein the first and second input signal represent the output from a first and a second microphone respectively;
- transforming the input signals from a time domain representation and into a time-frequency domain representation;
- estimating an inter-microphone phase difference between the first and the second microphone using the input signals in the time-frequency domain representation;
- determining an unbiased mean phase from a mean of the estimated inter-microphone phase difference or from the mean of a transformed estimated inter-microphone phase difference;
- determining a mapped mean resultant length;
- estimating a time difference of arrival using a plurality of unbiased mean phases weighted by a corresponding plurality of reliability measures, wherein each of the reliability measures are derived at least partly from a corresponding mapped mean resultant length;
- and
- using the estimated time difference of arrival for at least one hearing aid system processing stage.
5 more elements
A hearing aid system comprising a first and a second microphone, a filter bank, a digital signal processor and an electrical-acoustical output transducer;
- wherein the filter bank is adapted to:
- transform the input signals from the first and second microphone from a time domain representation and into a time-frequency domain representation;
- wherein the digital signal processor is configured to apply a frequency dependent gain that is adapted to at least one of suppressing noise and alleviating a hearing deficit of an individual wearing the hearing aid system;
- wherein the digital signal processor is adapted to:
- estimating an inter-microphone phase difference between the first and the second microphone using the input signals in the time-frequency domain representation;
- determining an unbiased mean phase from a mean of the estimated inter-microphone phase difference or from the mean of a transformed estimated inter-microphone phase difference;
- determining a mapped mean resultant length;
- estimating a time difference of arrival using a plurality of unbiased mean phases weighted by a corresponding plurality of reliability measures, wherein each of the reliability measures are derived at least partly from a corresponding mapped mean resultant length;
- and
- using the estimated time difference of arrival for at least one further hearing aid system processing stage.
7 more elements
Dependencies are inferred from the claim text.