Subband acoustie feedback cancerllation in hearing aids

A technology of acoustic feedback and hearing aids, applied in the direction of hearing aids, transducer acoustic response prevention, instruments, etc.

Inactive Publication Date: 2002-10-16
SONIC INNOVATIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult to design decision rules that trigger adaptive

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  • Subband acoustie feedback cancerllation in hearing aids
  • Subband acoustie feedback cancerllation in hearing aids
  • Subband acoustie feedback cancerllation in hearing aids

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Embodiment Construction

[0029] Those skilled in the art will appreciate that the following description of the present invention is for the purpose of illustration only and not for limitation. Those skilled in the art will think of other embodiments of the present invention under the enlightenment of the disclosure of the present invention.

[0030] The invention discloses a new sub-band feedback elimination scheme, which can provide an additional static gain greater than 10dB without introducing any audible unnatural signal. The present invention adopts two cascaded narrowband filters A i (Z) and B i (Z) and a fixed delay instead of a single filter W i (Z) and denote the delay of the feedback path in each subband, and here

[0031] W i (Z)=A i (Z)B i (Z)

[0032] The first filter, A i (Z), called the training filter, models the static part of the feedback path on the ith subband, including the microphone, receiver, ear canal resonator and other relatively static model param...

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PUM

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Abstract

A new subband feedback cancellation scheme is proposed, which can provide additional static gain without introducing audible artifacts. The subband feedback cancellation scheme employs two cascaded narrowband filters Ai(Z) and Bi(Z) and a fixed delay, instead of a single filter Wi(Z) and a delay representing the feedback path within each subband. The first filter, Ai(Z), is called the training filter, which models the static part of the feedback path on the ith subband, which includes the microphone, receiver, ear canal resonator and other relatively static parameters. The training filter can be implemented as a FIR filter or an IIR filter. This second filter Bi(Z) is called the tracking filter and is usually implemented as a FIR filter with fewer taps than the training filter. This second filter tracks changes in the feedback path on the ith sub-band caused by the user's jaw movement or the movement of an object close to the user's ear.

Description

technical field [0001] The invention relates to the field of digital signal processing. More particularly, the present invention relates to methods and apparatus for acoustic feedback suppression in digital audio devices, such as hearing aids. technical background [0002] Acoustic feedback, which is easily perceived as a high-pitched whistling or howling, is a very annoying problem that typically persists in audio devices with relatively high gain settings, such as many types of hearing aids. figure 1 is a system model of a prior art hearing aid. shown in figure 1 The prior art hearing aid model 100 in includes an input sequence of digital samples X(n) 110 which is added to a feedback output 125 to form a signal 127 which is processed by a hearing loss compensation function G(Z) 130 to form a Digital sample input sequence Y(n) 140 . like figure 1 As shown, in a typical hearing aid, sound leakage from the receiver to the microphone (represented by the transfer function ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G10L19/02G10L19/26G10L21/0208G10L21/0232H04R25/00
CPCH04R25/453H04R25/505H04R2430/03
Inventor 方小玲杰拉尔德·威尔逊布拉德·贾尔斯
Owner SONIC INNOVATIONS
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