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Adaptive residual feedback suppression

A feedback suppression, adaptive filter technology, applied in the prevention of acoustic wave response, sensor components, sensors, etc., can solve the problems of inability to feedback path modeling, instability, etc.

Active Publication Date: 2016-07-20
GN HEARING AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practice, however, feedback suppression circuits do not perfectly model the feedback path; leaving an undesired residual feedback signal for amplification
Nearly unstable, residual feedback signal can cause hearing aid output levels to exceed desired output levels

Method used

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  • Adaptive residual feedback suppression
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Embodiment Construction

[0110] Various embodiments are described below with reference to diagrams. It should also be noted that the diagrams are only intended to help describe the embodiments. They are not intended as an exhaustive description of the invention or as a limitation on the scope of the invention. In addition, an illustrated embodiment does not require all aspects or advantages to be shown. An aspect or advantage described in conjunction with a particular embodiment is not necessarily limited to that embodiment and may be practiced in any other embodiment even if not so illustrated.

[0111] The new method and the new hearing aid according to the appended claims may be embodied in different forms not shown in the drawings and should not be construed as limited to the examples set forth herein. Like reference numerals refer to like elements throughout. Identical elements will therefore not be described in detail in connection with the description of the respective figures.

[0112] fi...

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Abstract

A hearing aid includes: an input transducer for generating an audio signal; a feedback suppression circuit configured for modelling a feedback path of the hearing aid; a subtractor for subtracting an output signal of the feedback suppression circuit from the audio signal to form a feedback compensated audio signal; a signal processor that is coupled to an output of the subtractor for processing the feedback compensated audio signal to perform hearing loss compensation; and a receiver that is coupled to an output of the signal processor for converting the processed feedback compensated audio signal into a sound signal; wherein the hearing aid further comprises a gain processor for performing gain adjustment of the feedback compensated audio signal based at least on an estimate of a residual feedback signal of the feedback compensated audio signal, wherein the estimate of the residual feedback signal is based at least on the audio signal.

Description

technical field [0001] Embodiments described herein relate to hearing devices, such as hearing aids. Background technique [0002] In a hearing aid, an acoustic signal reaching a microphone of the hearing aid is amplified and output by means of a small speaker to restore audibility. Small distances between microphone and loudspeaker can cause feedback. Feedback is generated when a portion of the amplified acoustic output signal propagates back to the microphone for repeated amplification. When the feedback signal exceeds the original signal level at the microphone, the feedback loop becomes unstable, which may result in audible distortion or ringing. To prevent feedback, the gain must be turned down. [0003] The risk of feedback limits the maximum gain that can be used with hearing aids. The use of feedback suppression in hearing aids is well known. With feedback suppression, the feedback signal reaching the microphone is suppressed by subtracting the feedback model si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R25/00
CPCH04R25/305H04R25/453H04R1/1091H04R25/45H04R3/002
Inventor E·C·D·范德韦夫
Owner GN HEARING AS
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