Methods and apparatus for generating an anti-noise signal and equalizing a reproduced audio signal (e.g., a far-end telephone signal) are described, wherein the generating and the equalizing are both based on information from an acoustic error signal.

Systems, methods, devices, apparatus, and computer program products for audio equalization

Active noise cancellation is combined with spectrum modification of a reproduced audio signal to enhance intelligibility.

Systems, methods, apparatus, and computer-readable media for automatic control of active noise cancellation

Systems, methods, and apparatus for spectral contrast enhancement of speech signals, based on information from a noise reference that is derived by a spatially selective processing filter from a multichannel sensed audio signal, are disclosed.

Systems, methods, apparatus, and computer program products for spectral contrast enhancement

Disclosed is a hearing device system comprising at least one hearing aid circuitry and at least one active noise cancellation unit, the at least one hearing aid circuitry comprises at least one input transducer adapted to convert a first audio signal to an electric audio signal; a signal processor connected to the at least one input transducer and adapted to process said electric audio signal by at least partially correcting for a hearing loss of a user; an output transducer adapted to generate from at least said processed electric audio signal a sound pressure in an ear canal of the user, whereby the generated sound pressure is at least partially corrected for the hearing loss of the user; the at least one active noise cancellation unit being adapted to provide an active noise cancellation signal adapted to perform active noise cancellation of an acoustical signal entering the ear canal in addition to said generated sound pressure, wherein the hearing device system further comprises a combiner unit adapted to combine the processed electric audio signal with the active noise cancellation signal, to obtain a combined signal and to provide the combined signal to the output transducer.

Active noise cancellation in hearing devices

Techniques described herein include the use of equalization techniques to improve intelligibility of a reproduced audio signal (e.g., a far-end speech signal).

Systems, methods, apparatus and computer program products for enhanced intelligibility

A new subband feedback cancellation scheme is proposed, capable of providing additional stable gain without introducing audible artifacts. The subband feedback cancellation scheme employs a cascade of two narrow-band filters Ai(Z)and Bi(Z)ng with a fixed delay, instead of a single filter Wi(Z)and a delay to represent the feedback path in each subband. The first filter, Ai(Z), is called the training filter, and models the static portion of the feedback path in ith subband, including microphone, receiver, ear canal resonance, and other relatively static parameters. The training filter can be implemented as a FIR filter or as an IIR filter. The second filter, B?I?(Z), is called a tracking filter and is typically implemented as a FIR filter with fewer taps than the training filter. This second filter tracks the variations of the feedback path in the i?th? subband caused by jaw movement or objects close to the ears of the user.

Subband acoustic feedback cancellation in hearing aids

Subband acoustie feedback cancerllation in hearing aids

Method of subband acoustie feedback cancerllation in hearing aids and its device

Teilband-unterdrückung einer akustischen rückkopplung in hörgeräten

L'invention concerne un nouveau dispositif de suppression de l'effet Larsen de sous-bandes qui permet d'assurer un gain stable supplementaire sans introduction d'artefacts audibles. Ce dispositif de suppression de l'effet Larsen de sous-bandes met en oeuvre une cascade de filtres a bande etroite Ai(Z) et Bi(Z) ainsi qu'un circuit a retard fixe, plutot qu'un filtre uniqueWi(Z) et un circuit a retard, afin de representer le chemin de l'effet Larsen dans chaque sous-bande. Le premier filtre, Ai(Z), qui est appele filtre d'entrainement, modelise la partie statique du chemin de l'effet Larsen dans la ieme sous-bande, et notamment le microphone, le recepteur, la resonance du canal auditif et d'autres parametres relativement statiques. Le filtre d'entrainement peut etre mis en oeuvre en tant que filtre FIR ou en tant que filtre IIR. Le second filtre, B?I?(Z), qui est appele filtre de localisation, est typiquement mis en oeuvre en tant que filtre FIR dote d'un nombre de prises inferieur a celui du filtre d'entrainement. Ce second filtre localise les variations du chemin de l'effet Larsen dans la i?eme? sous-bande, provoquees par le mouvement des mâchoires ou d'objets proches des oreilles de l'utilisateur.

Brad Giles

Papers

Subband acoustic feedback cancellation in hearing aids

Subband acoustie feedback cancerllation in hearing aids

Method of subband acoustie feedback cancerllation in hearing aids and its device

Teilband-unterdrückung einer akustischen rückkopplung in hörgeräten

Suppression de l'effet larsen de sous-bandes dans des protheses auditives