Adaptive feedback cancellation based on inserted and/or intrinsic characteristics and matched retrieval

An input signal and adaptive filter technology, applied in the field of feedback cancellation, can solve the problem of low adaptation speed of the adaptive system

Active Publication Date: 2011-04-20
OTICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the preferably inaudible nature of the probe signal, the aforementioned prior art solutions lead to a rather slow adaptation speed of the adaptive system

Method used

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  • Adaptive feedback cancellation based on inserted and/or intrinsic characteristics and matched retrieval
  • Adaptive feedback cancellation based on inserted and/or intrinsic characteristics and matched retrieval
  • Adaptive feedback cancellation based on inserted and/or intrinsic characteristics and matched retrieval

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Embodiment Construction

[0130] According to an embodiment of the present invention, a method is proposed which makes the convergence much faster while maintaining the advantage of being still robust against autocorrelation (AC) problems. The following embodiments of the invention are shown as block diagrams of individual functional elements of an audio processing system, such as a listening device or a communication device. In general, the functional elements can be implemented in hardware or software, depending on the current application and constraints. However, it should be understood that most of the functional blocks shown in the figures are intended to be implemented as software algorithms in at least some embodiments. Examples of the aforementioned blocks are the forward gain block G(z,n), the adaptive filter block such as the feedback estimator transfer function Fh(z,n) and the corresponding algorithm for updating the filter coefficients of the feedback estimator transfer function or filter ...

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Abstract

The present invention discloses an adaptive feedback cancellation based on inserted and / or intrinsic characteristics and matched retrieval, which is realized by an audio processing system used for processing the input sound to output sound and a method for estimating a feedback transfer function in the audio processing system. The audio processing system comprises the following components: an input transducer; an output transducer; a forward path which comprises a signal processing unit; an electric feedback loop which extends from an output side and an input side and comprises a feedback path estimation unit which is used for estimating a sound feedback transfer function from the output transducer to the input transducer; and an enhancement unit which is used for extracting the characteristic of the electrical signal of the forward path and providing the estimated characteristic output; wherein the feedback path estimation unit is suitable for estimating the sound feedback transfer function with the estimated characteristic output. The invention can minimize the feedback in an audio processing system and may e.g. be used in hearing aids, head sets, mobile phones, wearable / portable communication devices, etc.

Description

technical field [0001] The invention relates to feedback cancellation methods in audio systems such as listening devices such as hearing aids. In particular, the invention relates to an audio processing system, such as a listening device or a communication device, for processing input sound into output sound. The invention also relates to a method of estimating a feedback transfer function in an audio processing system such as a listening device. The present invention also relates to data processing systems and computer-readable media. [0002] For example, the present invention may be used in applications such as broadcasting systems, entertainment systems, hearing aids, headphones, mobile phones, wearable / portable communication devices, and the like. Background technique [0003] The following description of the prior art relates to one of the fields of application of the invention, hearing aids. [0004] It is well known that in standard adaptive feedback cancellation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R25/00
Inventor J・延森T・B・埃尔梅迪布
Owner OTICON
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