EP1931172A1 - Hearing aid with noise cancellation and corresponding method - Google Patents
Hearing aid with noise cancellation and corresponding method Download PDFInfo
- Publication number
- EP1931172A1 EP1931172A1 EP06024958A EP06024958A EP1931172A1 EP 1931172 A1 EP1931172 A1 EP 1931172A1 EP 06024958 A EP06024958 A EP 06024958A EP 06024958 A EP06024958 A EP 06024958A EP 1931172 A1 EP1931172 A1 EP 1931172A1
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- EP
- European Patent Office
- Prior art keywords
- hearing aid
- vent
- microphone
- signal
- eardrum
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
- H04R25/45—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback
- H04R25/453—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback electronically
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
- G10K11/17813—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
- G10K11/17815—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the reference signals and the error signals, i.e. primary path
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
- G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1785—Methods, e.g. algorithms; Devices
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1787—General system configurations
- G10K11/17873—General system configurations using a reference signal without an error signal, e.g. pure feedforward
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
- G10K11/1787—General system configurations
- G10K11/17885—General system configurations additionally using a desired external signal, e.g. pass-through audio such as music or speech
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/108—Communication systems, e.g. where useful sound is kept and noise is cancelled
- G10K2210/1081—Earphones, e.g. for telephones, ear protectors or headsets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
- H04R2460/11—Aspects relating to vents, e.g. shape, orientation, acoustic properties in ear tips of hearing devices to prevent occlusion
Definitions
- the present invention relates to a hearing aid having a useful signal interface for receiving an electrical or electromagnetic useful signal, a microphone for receiving a noise signal and a receiver for outputting a processed useful signal, wherein when wearing the hearing aid in or on the ear a Vent is formed, through which a sound transmission function from the microphone to the eardrum of the hearing aid wearer. Moreover, the present invention relates to a corresponding method for reducing noise when wearing a hearing aid.
- Hearing aids are portable hearing aids that are used to care for the hearing impaired.
- different types of hearing aids such as behind-the-ear hearing aids (BTE), in-the-ear hearing aids (IDO) and Concha hearing aids are provided.
- BTE behind-the-ear hearing aids
- IDO in-the-ear hearing aids
- Concha hearing aids are provided.
- the hearing aids listed by way of example are worn on the outer ear or in the ear canal.
- bone conduction hearing aids, implantable or vibrotactile hearing aids are also available on the market. The stimulation of the damaged hearing takes place either mechanically or electrically.
- Hearing aids have in principle as essential components an input transducer, an amplifier and an output transducer.
- the input transducer is usually a sound receiver, z. As a microphone, and / or an electromagnetic receiver, for. B. an induction coil.
- the output transducer is usually used as an electroacoustic transducer, z. As miniature speaker, or as an electromechanical transducer, z. B. bone conduction, realized.
- the amplifier is usually integrated in a signal processing unit. This basic structure is in FIG. 1 using the example of a behind-the-ear hearing aid shown. In a hearing aid housing 1 for carrying behind the ear, one or more microphones 2 for receiving the sound from the environment are installed.
- a signal processing unit 3 which is also integrated in the hearing aid housing 1, processes the microphone signals and amplifies them.
- the output signal of the signal processing unit 3 is transmitted to a loudspeaker or earpiece 4, which outputs an acoustic signal.
- the sound is optionally transmitted via a sound tube, which is fixed with an earmold in the ear canal, to the eardrum of the device carrier.
- the power supply of the hearing device and in particular of the signal processing unit 3 is carried out by a likewise integrated into the hearing aid housing 1 battery. 5
- vent ventilation channel
- in-the-ear hearing device or in the earmold for a behind-the-ear hearing device.
- it is intended to be used for an imaginary circular opening equivalent to one or more actual openings such as those found in open-circuited appliances.
- Noise suppression techniques are well known for hearing aids. As a rule, the interference in the microphone signal is suppressed and reproduced in a reduced manner. Low-frequency direct sound, which passes the hearing aid over to the eardrum, can not be suppressed in this way. Rather, this is further intensified by the increased playback of the hearing aid.
- the object of the present invention is therefore to propose a hearing aid which receives an electrical or electromagnetic useful signal and is better prevented in the disturbing direct sound. Furthermore, a corresponding Störschallunterd Wegungs vide should be presented.
- this object is achieved by a hearing device having a useful signal interface for receiving an electrical or electromagnetic useful signal, a microphone for receiving a noise and a receiver for outputting a processed useful signal, wherein when wearing the hearing aid in or on the ear a Vent is formed by the a Sound transmission function is given by the microphone to the eardrum of the hearing aid wearer, and a filter which is connected between the microphone and the listener and whose transfer function is formed depending on the sound transmission function of the Vents such that a passing through the vent to the eardrum noise by a compensating sound which is generated on the basis of a noise signal from the microphone of the listener, is reduced in an effect on the eardrum.
- the invention provides a method for reducing background noise when wearing a hearing aid by receiving an electrical or electromagnetic useful signal by the hearing aid, recording a noise by a microphone of the hearing aid and outputting a processed useful signal from a handset of the hearing aid, wherein when wearing the hearing aid in or on the ear a Vent is formed, through which a sound transmission function is given by the microphone to the eardrum of the hearing aid wearer, and by filtering the noise signal of the microphone as a function of the sound transmission function of the Vents such that a passing through the vent to the eardrum noise by a compensation sound, which is generated on the basis of a noise signal from the microphone by the listener, is reduced in its effect on the eardrum.
- a significant reduction of low-frequency direct sound when wearing hearing aids can be achieved by the hearing aid according to the invention and the inventive method.
- the extent of the reduction depends on the parameters of the respective hearing aid, z. B. Vent diameter, hearing aid type, etc., from.
- Another advantage of the proposed solution is that no additional hardware components are needed on the hearing aid, since the already existing on a hearing aid external microphone is used to record the noise.
- the signal processing effort to run the hearing aid is very low, since the determination of the filter (digital filter) is made in advance based on the parameters of the hearing aid configuration.
- the hearing aid improved according to the invention can be designed for open supply. This is especially the case with a high-frequency supply.
- the direct sound can reach the eardrum almost unhindered, but according to the invention it is effectively suppressed as far as necessary by the compensating sound.
- a hearing aid may have an earmold that has a vent for ventilation. Also, the direct sound penetrating through the vent can be effectively reduced according to the invention.
- the transfer function of the above-mentioned filter may have a vent diameter as a variable parameter. With an open supply, this vent diameter can be an equivalent diameter. This parameter makes it relatively easy to set an effective noise reduction for the individual case.
- a level limiting circuit is connected between the filter and the listener. This can be prevented that occurs at high signal levels overdriving.
- the direct sound reaching a tympanic membrane of a hearing aid wearer is reduced by means of out-of-phase cancellation.
- the hearing aid receives an electrical or electromagnetic signal wirelessly or by cable.
- a hearing aid signal processor SP processes the useful signal and supplies an output signal to a handset H.
- the handset H is arranged in the ear or in the auditory canal in the present example, while the remaining part of the hearing aid is outside the ear.
- the processed useful signal is converted in the receiver H into a useful sound and transmitted acoustically within the auditory canal to the eardrum TF of the hearing aid wearer.
- the interference signal or ambient signal is recorded with the hearing aid microphone MI, and the resulting interference sound signal is amplified and digitized in an amplifier and A / D converter AD.
- the digital interference signal is subjected in a filter F for active interference suppression to filtering with the transfer function H_anc. After filtering, the signal is subtracted from the processed payload signal of the signal processor SP in a subtracter SU, i. H. added in antiphase, and in this form also reproduced on the listener H.
- the hearing aid shell or the otoplastic of the hearing aid has a vent for ventilation, or there is directly open supply. Therefore, the noise can also go directly through the vent or the opening in the ear to the eardrum TF.
- H_vent For direct sound through the vent results in a transfer function H_vent, which leads to that in the first Low-frequency sound passes through this direct path to the tympanic membrane TF.
- the transfer function H_anc is set in the filter F in such a way that the reproduced signal is canceled out in phase opposition to the signal which has been passed acoustically through the (equivalent) vent to the tympanic membrane TF.
- the transfer function H_anc an acoustoelectric conversion in the microphone MI, the processing in the amplifier and converter AD and a model of the vents are taken into account.
- the transfer function H_imohr represents the e-electro-acoustic transmission of the electrical signal from the speaker to the acoustic signal at the eardrum TF.
- a hearing aid according to FIG. 3 provided in order to prevent overdriving. This corresponds essentially to that of FIG. 2 .
- a level limiter PB is inserted in the Störsignalpfad.
- the digital ANC filter F has to be designed considering hearing aid conditions, since these determine the (electro) acoustic transfer functions H_vent and H_imohr.
- this hearing aid specific design of the ANC filter F is pre-determined, e.g. As in the hearing aid fitting, designed parametrically.
- input variables are accordingly FIG. 4 only known parameters such as (equivalent) vent diameter and vent length and hearing aid speaker type.
- a dashed arrow is in FIG. 4 indicated that other specific parameters can be used as input variables.
- the analog transfer function H_vent can be determined.
- the digital filter F can be found by standard methods of signal processing. This is characterized by the corresponding filter coefficients.
- the hearing aid system specific parameters are also used to determine a threshold from which the override of the loudspeaker H is expected. Accordingly, according to FIG. 4 in the filter design FD also obtained from the input variables, an overdrive threshold. This overdrive threshold is then stored in the level limiter PB (cf. FIG. 3 ) is used to limit the filter output signal.
- the useful signal is coupled by radio into the hearing aid.
- the ambient sound is mainly disturbing.
- any acoustic signal is annoying when a telephone signal is transmitted inductively to the hearing aid.
- acoustically received noises are disturbing when a piece of music is transmitted via radio interface to the hearing aid.
- the hearing aid according to the invention or the method according to the invention can also advantageously be used for active ear plugs and, for example, during playback for wireline transmitted music (eg via an audio shoe).
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- General Health & Medical Sciences (AREA)
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- Audiology, Speech & Language Pathology (AREA)
- Neurosurgery (AREA)
- Otolaryngology (AREA)
- Signal Processing (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
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Abstract
Description
Die vorliegende Erfindung betrifft ein Hörgerät mit einer Nutzsignalschnittstelle zum Aufnehmen eines elektrischen oder elektromagnetischen Nutzsignals, einem Mikrofon zur Aufnahme eines Störsignals und einem Hörer zur Ausgabe eines verarbeiteten Nutzsignals, wobei beim Tragen des Hörgeräts im oder am Ohr ein Vent gebildet ist, durch das eine Schallübertragungsfunktion von dem Mikrofon zu dem Trommelfell des Hörgeräteträgers gegeben ist. Darüber hinaus betrifft die vorliegende Erfindung ein entsprechendes Verfahren zum Reduzieren eines Störschalls beim Tragen eines Hörgeräts.The present invention relates to a hearing aid having a useful signal interface for receiving an electrical or electromagnetic useful signal, a microphone for receiving a noise signal and a receiver for outputting a processed useful signal, wherein when wearing the hearing aid in or on the ear a Vent is formed, through which a sound transmission function from the microphone to the eardrum of the hearing aid wearer. Moreover, the present invention relates to a corresponding method for reducing noise when wearing a hearing aid.
Hörgeräte sind tragbare Hörvorrichtungen, die zur Versorgung von Schwerhörenden dienen. Um den zahlreichen individuellen Bedürfnissen entgegenzukommen, werden unterschiedliche Bauformen von Hörgeräten wie Hinter-dem-Ohr-Hörgeräte (HdO), In-dem-Ohr-Hörgeräte (IdO) und Concha-Hörgeräte bereitgestellt. Die beispielhaft aufgeführten Hörgeräte werden am Außenohr oder im Gehörgang getragen. Darüber hinaus stehen auf dem Markt aber auch Knochenleitungshörhilfen, implantierbare oder vibrotaktile Hörhilfen zur Verfügung. Dabei erfolgt die Stimulation des geschädigten Gehörs entweder mechanisch oder elektrisch.Hearing aids are portable hearing aids that are used to care for the hearing impaired. To meet the numerous individual needs, different types of hearing aids such as behind-the-ear hearing aids (BTE), in-the-ear hearing aids (IDO) and Concha hearing aids are provided. The hearing aids listed by way of example are worn on the outer ear or in the ear canal. In addition, bone conduction hearing aids, implantable or vibrotactile hearing aids are also available on the market. The stimulation of the damaged hearing takes place either mechanically or electrically.
Hörgeräte besitzen prinzipiell als wesentliche Komponenten einen Eingangswandler, einen Verstärker und einen Ausgangswandler. Der Eingangswandler ist in der Regel ein Schallempfänger, z. B. ein Mikrofon, und/oder ein elektromagnetischer Empfänger, z. B. eine Induktionsspule. Der Ausgangswandler ist meist als elektroakustischer Wandler, z. B. Miniaturlautsprecher, oder als elektromechanischer Wandler, z. B. Knochenleitungshörer, realisiert. Der Verstärker ist üblicherweise in eine Signalverarbeitungseinheit integriert. Dieser prinzipielle Aufbau ist in
Vielfach problematisch bei Hörgeräten ist tieffrequenter Schall, der direkt an das versorgte Ohr gelangt. Beispielsweise tritt in vielen Schallsituationen (Auto, Straße, Flugzeug, Baustelle ...) störender tieffrequenter Schall auf, der durch das Vent des Hörgeräts zum Trommelfell gelangt. Die Bezeichnung "Vent" (Ventilationskanal) soll hierbei zum einen die Belüftungsbohrung in einem In-dem-Ohr-Hörgerät oder im Ohrpassstück für ein Hinter-dem-Ohr-Hörgerät bezeichnen. Zum anderen soll sie für eine gedachte kreisförmige Öffnung, die äquivalent zu einer oder mehreren tatsächlichen Öffnungen ist, wie sie bei Geräten mit offener Versorgung entstehen, verwendet werden.Frequently problematic in hearing aids is low-frequency sound, which reaches directly to the supplied ear. For example, in many sound situations (car, road, airplane, construction site ...) disturbing low-frequency sound occurs, which passes through the vent of the hearing aid to the eardrum. The term "vent" (ventilation channel) is intended here to denote on the one hand the ventilation bore in an in-the-ear hearing device or in the earmold for a behind-the-ear hearing device. On the other hand, it is intended to be used for an imaginary circular opening equivalent to one or more actual openings such as those found in open-circuited appliances.
Störgeräuschunterdrückungsverfahren sind für Hörgeräte hinlänglich bekannt. Dabei wird in der Regel die Störung im Mikrofonsignal unterdrückt und vermindert wiedergegeben. Tieffrequenter Direktschall, der am Hörgerät vorbei zum Trommelfell gelangt, kann auf diese Weise nicht unterdrückt werden. Vielmehr wird dieser durch die verstärkte Wiedergabe vom Hörgerät noch weiter intensiviert.Noise suppression techniques are well known for hearing aids. As a rule, the interference in the microphone signal is suppressed and reproduced in a reduced manner. Low-frequency direct sound, which passes the hearing aid over to the eardrum, can not be suppressed in this way. Rather, this is further intensified by the increased playback of the hearing aid.
Aus der Patentschrift
Weiterhin beschreibt die Patentschrift
Darüber hinaus bestehen insbesondere dann Probleme mit Direktschallen, wenn das Hörgerät mit einem kabellosen Empfangssystem ausgestattet ist, bei dem das Nutzsignal per Funk ins Hörgerät eingekoppelt wird.In addition, in particular, there are problems with direct sound when the hearing aid is equipped with a wireless receiving system, in which the useful signal is coupled by radio into the hearing aid.
Die Aufgabe der vorliegenden Erfindung besteht somit darin, ein Hörgerät vorzuschlagen, das ein elektrisches oder elektromagnetisches Nutzsignal empfängt und bei dem störender Direktschall besser unterbunden ist. Ferner soll ein entsprechendes Störschallunterdrückungsverfahren vorgestellt werden.The object of the present invention is therefore to propose a hearing aid which receives an electrical or electromagnetic useful signal and is better prevented in the disturbing direct sound. Furthermore, a corresponding Störschallunterdrückungsverfahren should be presented.
Erfindungsgemäß wird diese Aufgabe gelöst durch ein Hörgerät mit einer Nutzsignalschnittstelle zum Aufnehmen eines elektrischen oder elektromagnetischen Nutzsignals, einem Mikrofon zur Aufnahme eines Störschalls und einem Hörer zur Ausgabe eines verarbeiteten Nutzsignals, wobei beim Tragen des Hörgeräts im oder am Ohr ein Vent gebildet ist, durch das eine Schallübertragungsfunktion von dem Mikrofon zu dem Trommelfell des Hörgeräteträgers gegeben ist, sowie einem Filter, das zwischen das Mikrofon und den Hörer geschaltet ist und dessen Übertragungsfunktion in Abhängigkeit der Schallübertragungsfunktion des Vents derart gebildet ist, dass ein durch das Vent zum Trommelfell gelangender Störschall durch einen Ausgleichsschall, der auf der Basis eines Störschallsignals des Mikrofons von dem Hörer erzeugt wird, in einer Wirkung auf das Trommelfell reduziert wird.According to the invention, this object is achieved by a hearing device having a useful signal interface for receiving an electrical or electromagnetic useful signal, a microphone for receiving a noise and a receiver for outputting a processed useful signal, wherein when wearing the hearing aid in or on the ear a Vent is formed by the a Sound transmission function is given by the microphone to the eardrum of the hearing aid wearer, and a filter which is connected between the microphone and the listener and whose transfer function is formed depending on the sound transmission function of the Vents such that a passing through the vent to the eardrum noise by a compensating sound which is generated on the basis of a noise signal from the microphone of the listener, is reduced in an effect on the eardrum.
Darüber hinaus wird erfindungsgemäß bereitgestellt ein Verfahren zum Reduzieren eines Störschalls beim Tragen eines Hörgeräts durch Aufnehmen eines elektrischen oder elektromagnetischen Nutzsignals durch das Hörgerät, Aufnehmen eines Störschalls durch ein Mikrofon des Hörgeräts und Ausgeben eines verarbeiteten Nutzsignals aus einem Hörer des Hörgeräts, wobei beim Tragen des Hörgeräts im oder am Ohr ein Vent gebildet ist, durch den eine Schallübertragungsfunktion von dem Mikrofon zu dem Trommelfell des Hörgeräteträgers gegeben ist, sowie durch Filtern des Störschallsignals des Mikrofons in Abhängigkeit von der Schallübertragungsfunktion des Vents derart, dass ein durch das Vent zum Trommelfell gelangender Störschall durch einen Ausgleichsschall, der auf der Basis eines Störschallsignals des Mikrofons von dem Hörer erzeugt wird, in seiner Wirkung auf das Trommelfell reduziert wird.In addition, the invention provides a method for reducing background noise when wearing a hearing aid by receiving an electrical or electromagnetic useful signal by the hearing aid, recording a noise by a microphone of the hearing aid and outputting a processed useful signal from a handset of the hearing aid, wherein when wearing the hearing aid in or on the ear a Vent is formed, through which a sound transmission function is given by the microphone to the eardrum of the hearing aid wearer, and by filtering the noise signal of the microphone as a function of the sound transmission function of the Vents such that a passing through the vent to the eardrum noise by a compensation sound, which is generated on the basis of a noise signal from the microphone by the listener, is reduced in its effect on the eardrum.
In vorteilhafter Weise kann durch das erfindungsgemäße Hörgerät und das erfindungsgemäße Verfahren eine deutliche Reduktion von tieffrequentem Direktschall beim Tragen von Hörgeräten erreicht werden. Das Ausmaß der Reduktion hängt von den Parametern des jeweiligen Hörgeräts, z. B. Ventdurchmesser, Hörgerätetyp etc., ab. Ein weiterer Vorteil der vorgeschlagenen Lösung besteht darin, dass keine zusätzliche Hardware-Komponenten am Hörgerät benötigt werden, da das an einem Hörgerät ohnehin vorhandene Außenmikrofon zur Aufnahme des Störschalls verwendet wird. Außerdem ist der Signalverarbeitungsaufwand zur Laufzeit des Hörgeräts sehr gering, da die Ermittlung des Filters (Digitalfilters) vorab aufgrund der Parameter der Hörgerätekonfiguration erfolgt.Advantageously, a significant reduction of low-frequency direct sound when wearing hearing aids can be achieved by the hearing aid according to the invention and the inventive method. The extent of the reduction depends on the parameters of the respective hearing aid, z. B. Vent diameter, hearing aid type, etc., from. Another advantage of the proposed solution is that no additional hardware components are needed on the hearing aid, since the already existing on a hearing aid external microphone is used to record the noise. In addition, the signal processing effort to run the hearing aid is very low, since the determination of the filter (digital filter) is made in advance based on the parameters of the hearing aid configuration.
Das erfindungsgemäß verbesserte Hörgerät kann zur offenen Versorgung ausgelegt sein. Dies ist speziell bei einer Hochtonversorgung der Fall. Hier kann der Direktschall fast ungehindert zum Trommelfell gelangen, er wird aber erfindungsgemäß soweit notwendig durch den Ausgleichsschall wirksam unterdrückt.The hearing aid improved according to the invention can be designed for open supply. This is especially the case with a high-frequency supply. Here the direct sound can reach the eardrum almost unhindered, but according to the invention it is effectively suppressed as far as necessary by the compensating sound.
In anderen Fällen kann ein Hörgerät eine Otoplastik aufweisen, die ein Vent zur Belüftung besitzt. Auch der durch das Vent hindurchdringende Direktschall lässt sich entsprechend der Erfindung wirksam reduzieren.In other cases, a hearing aid may have an earmold that has a vent for ventilation. Also, the direct sound penetrating through the vent can be effectively reduced according to the invention.
Die Übertragungsfunktion des oben genannten Filters kann als variablen Parameter einen Ventdurchmesser aufweisen. Bei einer offenen Versorgung kann dieser Ventdurchmesser ein äquivalenter Durchmesser sein. Durch diesen Parameter lässt sich verhältnismäßig einfach für den individuellen Fall eine wirkungsvolle Störgeräuschunterdrückung einstellen.The transfer function of the above-mentioned filter may have a vent diameter as a variable parameter. With an open supply, this vent diameter can be an equivalent diameter. This parameter makes it relatively easy to set an effective noise reduction for the individual case.
Vorzugsweise ist zwischen das Filter und den Hörer eine Pegelbegrenzungsschaltung geschaltet. Dadurch kann verhindert werden, dass bei hohen Signalpegeln eine Übersteuerung stattfindet.Preferably, a level limiting circuit is connected between the filter and the listener. This can be prevented that occurs at high signal levels overdriving.
Die vorliegende Erfindung ist anhand der beigefügten Zeichnungen näher erläutert, in denen zeigen:
-
FIG 1 den prinzipiellen Aufbau eines Hörgeräts gemäß dem Stand der Technik; -
FIG 2 ein Blockschaltbild eines erfindungsgemäßen Hörgeräts gemäß einer ersten Ausführungsform; -
FIG 3 ein Blockschaltbild eines erfindungsgemäßen Hörgeräts gemäß einer zweiten Ausführungsform und -
FIG 4 ein Diagramm zur Vorab-Ermittlung eines Digitalfilters.
-
FIG. 1 the basic structure of a hearing aid according to the prior art; -
FIG. 2 a block diagram of a hearing aid according to the invention according to a first embodiment; -
FIG. 3 a block diagram of a hearing aid according to a second embodiment and -
FIG. 4 a diagram for the preliminary determination of a digital filter.
Die nachfolgend näher geschilderten Ausführungsformen stellen bevorzugte Ausführungsbeispiele der vorliegenden Erfindung dar.The embodiments described in more detail below represent preferred embodiments of the present invention.
Der zu einem Trommelfell eines Hörgeräteträgers gelangende Direktschall wird mittels gegenphasiger Auslöschung reduziert. Als Nutzsignal empfängt das Hörgerät ein elektrisches oder elektromagnetisches Signal kabellos oder kabelgebunden. Ein Hörgerätesignalprozessor SP verarbeitet das Nutzsignal und liefert ein Ausgangssignal an einen Hörer H. Der Hörer H ist im vorliegenden Beispiel im Ohr bzw. im Gehörgang angeordnet, während sich der restliche Teil des Hörgeräts außerhalb des Ohrs befindet. Das verarbeitete Nutzsignal wird im Hörer H in einen Nutzschall gewandelt und innerhalb des Gehörgangs akustisch zum Trommelfell TF des Hörgeräteträgers übertragen.The direct sound reaching a tympanic membrane of a hearing aid wearer is reduced by means of out-of-phase cancellation. As a useful signal, the hearing aid receives an electrical or electromagnetic signal wirelessly or by cable. A hearing aid signal processor SP processes the useful signal and supplies an output signal to a handset H. The handset H is arranged in the ear or in the auditory canal in the present example, while the remaining part of the hearing aid is outside the ear. The processed useful signal is converted in the receiver H into a useful sound and transmitted acoustically within the auditory canal to the eardrum TF of the hearing aid wearer.
Das Störsignal bzw. Umgebungssignal wird mit dem Hörgerätemikrofon MI aufgenommen, und das resultierende Störschallsignal wird in einem Verstärker und A/D-Wandler AD verstärkt und digitalisiert. Das digitale Störsignal wird in einem Filter F zur aktiven Störunterdrückung einer Filterung mit der Übertragungsfunktion H_anc unterworfen. Nach der Filterung wird das Signal in einem Subtrahierer SU von dem verarbeiteten Nutzsignal des Signalprozessors SP subtrahiert, d. h. gegenphasig addiert, und in dieser Form ebenfalls über den Hörer H wiedergegeben.The interference signal or ambient signal is recorded with the hearing aid microphone MI, and the resulting interference sound signal is amplified and digitized in an amplifier and A / D converter AD. The digital interference signal is subjected in a filter F for active interference suppression to filtering with the transfer function H_anc. After filtering, the signal is subtracted from the processed payload signal of the signal processor SP in a subtracter SU, i. H. added in antiphase, and in this form also reproduced on the listener H.
Die Hörgeräteschale bzw. die Otoplastik des Hörgeräts besitzt ein Vent für die Ventilation, oder aber es liegt direkt offene Versorgung vor. Daher kann der Störschall auch direkt durch das Vent bzw. die Öffnung ins Ohr zum Trommelfell TF gelangen. Für den Direktschall durch das Vent ergibt sich eine Übertragungsfunktion H_vent, die dazu führt, dass in erster Linie tieffrequenter Schall über diesen direkten Weg zum Trommelfell TF gelangt.The hearing aid shell or the otoplastic of the hearing aid has a vent for ventilation, or there is directly open supply. Therefore, the noise can also go directly through the vent or the opening in the ear to the eardrum TF. For direct sound through the vent results in a transfer function H_vent, which leads to that in the first Low-frequency sound passes through this direct path to the tympanic membrane TF.
Die Übertragungsfunktion H_anc wird im Filter F so eingestellt, dass sich das wiedergegebene Signal mit dem auf akustischem Weg durch das (äquivalente) Vent zum Trommelfell TF gelangte Signal gegenphasig auslöscht. Hierzu wird das Digitalfilter F so bestimmt, dass für die Übertragungsfunktionen gilt:
Dabei ist in der Übertragungsfunktion H_anc eine akustoelektrische Wandlung im Mikrofon MI, die Verarbeitung im Verstärker und Wandler AD sowie ein Modell des Vents berücksichtigt. Die Übertragungsfunktion H_imohr repräsentiert die e-lektroakustische Übertragung des elektrischen Signals vom Lautsprecher zum akustischen Signal am Trommelfell TF.In this case, in the transfer function H_anc an acoustoelectric conversion in the microphone MI, the processing in the amplifier and converter AD and a model of the vents are taken into account. The transfer function H_imohr represents the e-electro-acoustic transmission of the electrical signal from the speaker to the acoustic signal at the eardrum TF.
Bei besonders offener Hörgeräteanpassung besteht bei hohen Signalpegeln die Gefahr der Übersteuerung. Der Pegel, ab dem Übersteuerung auftritt, wird neben dem äquivalenten Ventdurchmesser vom Hörgerätelautsprechertyp bestimmt. Um eine Übersteuerung zu verhindern, wird entsprechend einer zweiten Ausführungsform der vorliegenden Erfindung ein Hörgerät gemäß
Das digitale ANC-Filter F muss unter Beachtung von Hörgeräterandbedingungen entworfen werden, da diese die (elektro-) akustischen Übertragungsfunktionen H_vent und H_imohr bestimmen. Günstigerweise wird dieser hörgerätespezifische Entwurf des ANC-Filters F vorab, z. B. bei der Hörgeräteanpassung, parametrisch entworfen. Als Eingangsgrößen werden entsprechend
Die hörgerätesystem-spezifischen Parameter werden ebenfalls dafür verwendet, eine Schwelle zu bestimmen, ab der Übersteuerung des Lautsprechers H zu erwarten ist. Dementsprechend wird gemäß
Besondere Vorteile der geschilderten Ausführungsbeispiele ergeben sich, wenn das Nutzsignal per Funk ins Hörgerät eingekoppelt wird. Bei dieser Anwendung ist der Umgebungsschall überwiegend störend. So ist beispielsweise jedes akustische Signal störend, wenn ein Telefonsignal induktiv auf das Hörgerät übertragen wird. Ebenso sind akustisch empfangene Geräusche störend, wenn ein Musikstück per Funkschnittstelle zum Hörgerät übertragen wird. Durch die gegenphasige Auslöschung unter Berücksichtigung der Vent-Übertragungsfunktion können derartige Störungen jedoch beseitigt werden. In diesem Sinn lässt sich das erfindungsgemäße Hörgerät bzw. das erfindungsgemäße Verfahren auch vorteilhaft für aktive Ohrstopfen und beispielsweise bei der Wiedergabe für drahtgebunden übertragene Musik (z. B. über einen Audio-Schuh) verwenden.Particular advantages of the described embodiments are obtained when the useful signal is coupled by radio into the hearing aid. In this application, the ambient sound is mainly disturbing. For example, any acoustic signal is annoying when a telephone signal is transmitted inductively to the hearing aid. Similarly, acoustically received noises are disturbing when a piece of music is transmitted via radio interface to the hearing aid. By out-of-phase cancellation taking into account the vent transfer function, however, such disturbances can be eliminated. In this sense, the hearing aid according to the invention or the method according to the invention can also advantageously be used for active ear plugs and, for example, during playback for wireline transmitted music (eg via an audio shoe).
Claims (9)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT06024958T ATE435572T1 (en) | 2006-12-01 | 2006-12-01 | HEARING AID WITH NOISE CANCELLATION AND CORRESPONDING METHOD |
DE502006004146T DE502006004146D1 (en) | 2006-12-01 | 2006-12-01 | Hearing aid with noise reduction and corresponding procedure |
DK06024958T DK1931172T3 (en) | 2006-12-01 | 2006-12-01 | Hearing aid with noise suppression and a similar method |
EP06024958A EP1931172B1 (en) | 2006-12-01 | 2006-12-01 | Hearing aid with noise cancellation and corresponding method |
US11/998,376 US20080130929A1 (en) | 2006-12-01 | 2007-11-29 | Hearing device with interference sound suppression and corresponding method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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EP06024958A EP1931172B1 (en) | 2006-12-01 | 2006-12-01 | Hearing aid with noise cancellation and corresponding method |
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EP1931172A1 true EP1931172A1 (en) | 2008-06-11 |
EP1931172B1 EP1931172B1 (en) | 2009-07-01 |
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EP06024958A Revoked EP1931172B1 (en) | 2006-12-01 | 2006-12-01 | Hearing aid with noise cancellation and corresponding method |
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US (1) | US20080130929A1 (en) |
EP (1) | EP1931172B1 (en) |
AT (1) | ATE435572T1 (en) |
DE (1) | DE502006004146D1 (en) |
DK (1) | DK1931172T3 (en) |
Cited By (3)
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EP2282558A3 (en) * | 2009-07-27 | 2013-01-09 | Siemens Medical Instruments Pte. Ltd. | Hearing aid and method |
EP2229010A3 (en) * | 2009-03-12 | 2013-12-04 | Siemens Medical Instruments Pte. Ltd. | Method for compensating for interference in a hearing aid, hearing aid and method for adapting the same |
DE102020206367A1 (en) | 2020-05-20 | 2021-11-25 | Sivantos Pte. Ltd. | Method for operating a hearing aid and hearing aid |
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US8831936B2 (en) * | 2008-05-29 | 2014-09-09 | Qualcomm Incorporated | Systems, methods, apparatus, and computer program products for speech signal processing using spectral contrast enhancement |
US8630685B2 (en) * | 2008-07-16 | 2014-01-14 | Qualcomm Incorporated | Method and apparatus for providing sidetone feedback notification to a user of a communication device with multiple microphones |
US8538749B2 (en) * | 2008-07-18 | 2013-09-17 | Qualcomm Incorporated | Systems, methods, apparatus, and computer program products for enhanced intelligibility |
US9202455B2 (en) * | 2008-11-24 | 2015-12-01 | Qualcomm Incorporated | Systems, methods, apparatus, and computer program products for enhanced active noise cancellation |
US9202456B2 (en) * | 2009-04-23 | 2015-12-01 | Qualcomm Incorporated | Systems, methods, apparatus, and computer-readable media for automatic control of active noise cancellation |
US9053697B2 (en) | 2010-06-01 | 2015-06-09 | Qualcomm Incorporated | Systems, methods, devices, apparatus, and computer program products for audio equalization |
CN108574898B (en) * | 2018-04-13 | 2020-12-04 | 会听声学科技(北京)有限公司 | Active noise reduction system optimization method and system |
EP3644307A1 (en) * | 2018-10-23 | 2020-04-29 | AMS Sensors UK Limited | Tuning method, manufacturing method, computer-readable storage medium and tuning system |
EP3694227A1 (en) * | 2019-02-07 | 2020-08-12 | Oticon A/s | A hearing device comprising an adjustable vent |
CN114630223B (en) * | 2020-12-10 | 2023-04-28 | 华为技术有限公司 | Method for optimizing functions of hearing-wearing device and hearing-wearing device |
KR102671092B1 (en) * | 2021-11-19 | 2024-05-31 | 썬전 샥 컴퍼니 리미티드 | open sound device |
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- 2006-12-01 EP EP06024958A patent/EP1931172B1/en not_active Revoked
- 2006-12-01 DE DE502006004146T patent/DE502006004146D1/en active Active
- 2006-12-01 DK DK06024958T patent/DK1931172T3/en active
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US6445799B1 (en) * | 1997-04-03 | 2002-09-03 | Gn Resound North America Corporation | Noise cancellation earpiece |
DE10332119B3 (en) * | 2003-07-16 | 2004-12-09 | Siemens Audiologische Technik Gmbh | Hearing aid worn in ear or with otoplastic worn in ear generates second acoustic earpiece signal region of ventilation channel to inhibit acoustic signal entering closed ear canal volume from outside |
WO2005052911A1 (en) * | 2003-11-26 | 2005-06-09 | Oticon A/S | Hearing aid with active noise canceling |
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EP2229010A3 (en) * | 2009-03-12 | 2013-12-04 | Siemens Medical Instruments Pte. Ltd. | Method for compensating for interference in a hearing aid, hearing aid and method for adapting the same |
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EP2282558A3 (en) * | 2009-07-27 | 2013-01-09 | Siemens Medical Instruments Pte. Ltd. | Hearing aid and method |
DE102020206367A1 (en) | 2020-05-20 | 2021-11-25 | Sivantos Pte. Ltd. | Method for operating a hearing aid and hearing aid |
Also Published As
Publication number | Publication date |
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EP1931172B1 (en) | 2009-07-01 |
DK1931172T3 (en) | 2009-10-12 |
US20080130929A1 (en) | 2008-06-05 |
ATE435572T1 (en) | 2009-07-15 |
DE502006004146D1 (en) | 2009-08-13 |
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