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US 10,111,016 B2Granted
Method of operating a hearing aid system and a hearing aid system
AssigneeWidex A/S
InventorsKristian Timm Andersen, Thomas Bo Elmedyb
Life of this patent
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Abstract
A method of operating a hearing aid system with virtually zero delay and phase distortion. The invention also provides a hearing aid system (100) adapted for carrying out such a method.
Claims12
A method of operating a hearing aid system comprising the steps of:
- providing an input signal,
- branching the input signal and hereby providing, in a first branch, the input signal to an all-pass filter and, in a second branch, providing the input signal to a signal processor, and in a third branch, providing the input signal to a first summation unit, wherein the all-pass filter is configured to introduce the same delay as the signal processor,
- further branching the all-pass filter output signal and hereby providing, in a fourth branch, the all-pass filter output signal to a first adaptive filter, and providing, in a fifth branch, the all-pass filter output signal to a an adaptive filter coefficient calculator,
- providing the first adaptive filter output signal to the first summation unit and hereby providing a first error signal as the first adaptive filter output signal subtracted from the input signal,
- optimizing the filter coefficients of the first adaptive filter, using the adaptive filter coefficient calculator, based on the first error signal and the all-pass filter output signal,
- processing the input signal in the signal processor and providing the signal processor output signal to a second adaptive filter, wherein the second adaptive filter is provided with the same filter coefficients as the first adaptive filter, and
- providing the second adaptive filter output signal and the first error signal for further processing in the hearing aid system.
4 more elements
A hearing aid system comprising:
- an acoustical-electrical input transducer, an all-pass filter, a first and second adaptive filter, an adaptive filter coefficient calculator, a signal processor, a first summation point and a second summation point, wherein the hearing aid system is configured such that:
- the output signal from the acoustical-electrical input transducer is provided, in a first branch, to the all-pass filter, in a second branch, to the signal processor, and, in a third branch, to the first summation unit, such that
- the output signal from the all-pass filter is provided, in a fourth branch, to the first adaptive filter and, in a fifth branch, to the adaptive filter coefficient calculator, wherein the all-pass filter is adapted to introduce the same delay as the signal processor, such that:
- the output signal from the first adaptive filter is provided to the first summation unit, wherein the summation unit is adapted to subtract the output signal from the first adaptive filter from the output signal from the acoustical-electrical input transducer, such that
- the output signal from the first summation unit is provided to the adaptive filter coefficient calculator, wherein the adaptive filter coefficient calculator is adapted to determine the filter coefficients of the first adaptive filter based on the output signals from first summation unit and the all-pass filter, such that
- the output signal from the signal processor is provided to the second adaptive filter, wherein the second adaptive filter is provided with the same filter coefficients as the first adaptive filter, and such that
- the output signals from the second adaptive filter and the first summation unit are provided for further processing in the hearing aid system.
4 more elements
Dependencies are inferred from the claim text.