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US 9,179,223 B2Granted
Audio system with feedback cancellation
AssigneeGN ReSound A/S
InventorsErik Cornelis Diederik Van Der Werf, Nikolai Bisgaard
Life of this patent
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Abstract
An audio system includes a signal processor for processing an audio signal, and a feedback suppressor circuit configured for modelling a feedback signal path of the audio system by provision of a feedback compensation signal based on sets of feedback model parameters for the feedback signal path that are stored in a repository.
Claims43
An audio system comprising:
- a signal processor for processing an audio signal, and
- a feedback suppressor circuit comprising an adaptive filter and configured for modelling a feedback signal path of the audio system by provision of a feedback compensation signal based on a cluster of feedback model parameters for the feedback signal path that are stored in a repository, wherein at least a subset of the feedback model parameters comprises coefficients for the adaptive filter, or is for use to obtain the coefficients for the adaptive filter;
- wherein the audio system is configured to apply a gain reduction in the signal path depending on the cluster of the feedback model parameters;
- and
- wherein the audio system is a hearing aid or a communication system.
2 more elements
An audio system comprising:
- a signal processor for processing an audio signal, and
- a feedback suppressor circuit comprising an adaptive filter and configured for modelling a feedback signal path of the audio system by provision of a feedback compensation signal based on one or more of feedback model parameters for the feedback signal path that are stored in a repository, wherein at least a subset of the feedback model parameters comprises coefficients for the adaptive filter, or is for use to obtain coefficients for the adaptive filter;
- wherein the feedback suppressor circuit is further configured for clustering some of the feedback model parameters to obtain a plurality of clusters;
- and
- wherein the audio system is a hearing aid or a communication system.
2 more elements
An audio system comprising:
- a signal processor for processing an audio signal, and
- a feedback suppressor circuit configured for modelling a feedback signal path of the audio system by provision of a feedback compensation signal based on a cluster of feedback model parameters for the feedback signal path that are stored in a repository;
- wherein the feedback suppressor circuit comprises an adaptive filter for modelling the feedback path, and wherein the cluster of the feedback model parameters stored in the repository comprise filter coefficients of the adaptive filter;
- wherein the audio system further comprises a switch that is configured for switching an input to the signal processor between an output of a first subtractor and an output of a second subtractor for subtracting an output signal of the adaptive filter from the audio signal;
- and
- wherein the audio system hearing aid or a communication system.
3 more elements
An audio system comprising:
- a signal processor for processing an audio signal, and
- a feedback suppressor circuit configured for modelling a feedback signal path of the audio system by provision of a feedback compensation signal based on a cluster of feedback model parameters for the feedback signal path that are stored in a repository;
- wherein the feedback suppressor circuit comprises an adaptive filter for modelling the feedback path, and wherein the cluster of the feedback model parameters stored in the repository comprise filter coefficients of the adaptive filter;
- wherein the feedback suppressor circuit is further configured for constrained updating the filter coefficients of the adaptive filter;
- and
- wherein the audio system is a hearing aid or a communication system.
3 more elements
An audio system comprising:
- a signal processor for processing an audio signal, and
- a feedback suppressor circuit configured for modelling a feedback signal path of the audio system by provision of a feedback compensation signal based on a cluster of feedback model parameters for the feedback signal path that are stored in a repository;
- wherein the feedback suppressor circuit comprises an adaptive filter for modelling the feedback path, and wherein the cluster of the feedback model parameters stored in the repository comprise filter coefficients of the adaptive filter;
- wherein the feedback suppressor circuit is configured for updating the filter coefficients of the adaptive filter by applying a de-correlation;
- and
- wherein the audio system is a hearing aid or a communication system.
3 more elements
An audio system comprising:
- a signal processor for processing an audio signal, and
- a feedback suppressor circuit comprising an adaptive filter and configured for modelling a feedback signal path of the audio system by provision of a feedback compensation signal based on a cluster of feedback model parameters for the feedback signal path that are stored in a repository, wherein at least a subset of the feedback model parameters comprises coefficients for the adaptive filter, or is for use to obtain the coefficients for the adaptive filter;
- wherein the audio system is configured to apply an adaptive non-linear de-correlation in the signal path;
- and
- wherein the audio system is a hearing aid or a communication system.
2 more elements
An audio system comprising:
- a signal processor for processing an audio signal, and
- a feedback suppressor circuit comprising an adaptive filter and configured for modelling a feedback signal path of the audio system by provision of a feedback compensation signal based on a cluster of feedback model parameters for the feedback signal path that are stored in a repository, wherein at least a subset of the feedback model parameters comprises coefficients for the adaptive filter, or is for use to obtain the coefficients for the adaptive filter;
- wherein the feedback suppressor circuit is further configured for maintaining a statistical model of an external signal to distinguish correlations between an output of the audio system and an input caused by feedback from correlations already present in the external signal;
- and
- wherein the audio system is a hearing aid or a communication system.
2 more elements
An audio system comprising:
- a signal processor for processing an audio signal, and
- a feedback suppressor circuit comprising an adaptive filter and configured for modelling a feedback signal path of the audio system by provision of a feedback compensation signal based on a cluster of feedback model parameters for the feedback signal path that are stored in a repository, wherein at least a subset of the feedback model parameters comprises coefficients for the adaptive filter, or is for use to obtain the coefficients for the adaptive filter;
- wherein the feedback suppressor circuit is further configured for maintaining the cluster of the feedback model parameters for the feedback path and a clustering model of an external signal;
- and
- wherein the audio system is a hearing aid or a communication system.
2 more elements
An audio system comprising:
- a signal processor for processing an audio signal, and
- a feedback suppressor circuit comprising an adaptive filter and configured for modelling a feedback signal path of the audio system by provision of a feedback compensation signal based on a cluster of feedback model parameters for the feedback signal path that are stored in a repository, wherein at least a subset of the feedback model parameters comprises coefficients for the adaptive filter or is obtain the coefficients for the adaptive filter;
- wherein the feedback suppressor circuit is further configured to operate on multiple input signals independently;
- wherein the feedback suppressor circuit is further configured to share information between the multiple input signals;
- and
- wherein the audio system is a hearing aid or a communication system.
3 more elements
An audio system comprising:
- a signal processor for processing an audio signal, and
- a feedback suppressor circuit comprising an adaptive filter and configured for modelling a feedback signal path of the audio system by provision of a feedback compensation signal based on a cluster of feedback model parameters for the feedback signal path that are stored in a repository, wherein at least a subset of the feedback model parameters comprises coefficients for the adaptive filter, or is for use to obtain the coefficients for the adaptive filter;
- wherein the feedback suppressor circuit is further configured to operate on multiple input signals independently;
- wherein the feedback suppressor circuit is further configured to use a shared signal model for the input signals;
- and
- wherein the audio system is a hearing aid or a communication system.
3 more elements
An audio system comprising:
- a signal processor for processing an audio signal, and
- a feedback suppressor circuit comprising an adaptive filter and configured for modelling a feedback signal path of the audio system by provision of a feedback compensation signal based on a cluster of feedback model parameters for the feedback signal path that are stored in a repository, wherein at least a subset of the feedback model parameters comprises coefficients for the adaptive filter, or is for use to obtain the coefficients for the adaptive filter;
- wherein the feedback suppressor circuit is further configured to operate on multiple input signals independently;
- wherein the feedback suppressor circuit is further configured with clustering models that combine feedback paths of all or some of the multiple input signals;
- and
- wherein the audio system is a hearing aid or a communication system.
3 more elements
An audio system comprising:
- a signal processor for processing an audio signal, and
- a feedback suppressor circuit comprising an adaptive filter and configured for modelling a feedback signal path of the audio system by provision of a feedback compensation signal based on a cluster of feedback model parameters for the feedback signal path that are stored in a repository, wherein at least a subset of the feedback model parameters comprises coefficients for the adaptive filter, or is for use to obtain the coefficients for the adaptive filter;
- wherein the feedback suppressor circuit is configured to take into account higher order statistics to characterize receiver, amplifier, and/or microphone non-linearities in the feedback path;
- and
- wherein the audio system is a hearing aid or a communication system.
2 more elements
An audio system comprising:
- a signal processor for processing an audio signal, and
- a feedback suppressor circuit comprising an adaptive filter and configured for modelling a feedback signal path of the audio system by provision of a feedback compensation signal based on a cluster of feedback model parameters for the feedback signal path that are stored in a repository, wherein at least a subset of the feedback model parameters comprises coefficients for the adaptive filter, or is for use to obtain the coefficients for the adaptive filter;
- wherein the feedback suppressor circuit of the audio system is configured to use a selected feedback model to detect a presence of a reflection from a phone;
- and
- wherein the audio system is a hearing aid or a communication system.
2 more elements
An audio system comprising:
- a signal processor for processing an audio signal, and
- a feedback suppressor circuit comprising an adaptive filter and configured for modelling a feedback signal path of the audio system by provision of a feedback compensation signal based on a cluster of feedback model parameters for the feedback signal path that are stored in a repository, wherein at least a subset of the feedback model parameters comprises coefficients for the adaptive filter, or is for use to obtain the coefficients for the adaptive filter;
- wherein the feedback suppressor circuit of the audio system is configured to use a current signal model to detect a use of a phone;
- and
- wherein the audio system is a hearing aid or a communication system.
2 more elements
Dependencies are inferred from the claim text.