Class / Patent application number | Description | Number of patent applications / Date published |
381318000 | Feedback suppression | 87 |
20080212816 | Hearing aid with feedback cancellation - A hearing aid includes a hearing aid housing enclosing a microphone for converting sound into an audio signal, first feedback compensation means for providing a first feedback compensation signal of signals picked up by the microphone by modelling an internal mechanical feedback signal path of the hearing aid, second feedback compensation means for providing a second feedback compensation signal by modelling an external feedback signal path of the hearing aid, subtracting means for subtracting the first and second feedback compensation signals from the audio signal to form a compensated audio signal, processing means, connected to an output of the subtracting means, for processing the compensated audio signal, and a receiver, connected to an output of the processing means, for converting the processed compensated audio signal into a sound signal. | 09-04-2008 |
20080232621 | APPARATUS FOR VENTED HEARING ASSISTANCE SYSTEMS - An apparatus related to earmolds with venting configurations designed to relieve the occlusion effect. Various designs provide multiple vents allow residual ear canal air volume to vent to and from air outside the ear and the earmold. In various designs, the earmold includes one vent between the residual ear canal air volume and a volume of air internal to the earmold. A second vent provides passage of air internal to the earmold and air external to the ear and the inserted earmold when worn by a user. | 09-25-2008 |
20080247578 | Hearing Aid Receiver With Vibration Compensation - In order to reduce feedback in a hearing aid, a hearing aid receiver is provided that comprises a housing having an inside surface and an outside surface, a motor, an active armature that is attached to the motor and attached to the inside surface of the housing, the active armature being driven in a vibrational manner by the motor, and an external passive component that is attached to the outside surface of the housing, the external passive component designed to vibrate in a direction opposed to vibrations of the active armature. A corresponding method for operating such a hearing aid receives is also provided. | 10-09-2008 |
20080273728 | HEARING AID WITH FEEDBACK MODEL GAIN ESTIMATION - A hearing aid includes an input transducer for transforming an acoustic input signal into an electrical input signal, a processor for generating an electrical output signal by amplifying the electrical input signal with a processor gain, an output transducer for transforming the electrical output signal into an acoustic output signal, an adaptive feedback suppression filter for generating a feedback cancellation signal, and a model gain estimator generating an upper processor gain limit and for providing a control parameter indicating a possible misadjustment of the model. | 11-06-2008 |
20080298615 | HEARING AID AND METHOD OF UTILIZING GAIN LIMITATION IN A HEARING AID - A hearing aid ( | 12-04-2008 |
20080304684 | METHOD AND APPARATUS FOR A HEARING ASSISTANCE SYSTEM WITH ADAPTIVE BULK DELAY - A hearing assistance system having adjustable bulk delay for cancellation of a time varying acoustic feedback path. The hearing assistance system including an FIR filter, coefficient update module, and delay rules module for programmable adaptive filtering. The hearing assistance system adjustable for continuous bulk delay adjustments. The hearing assistance system providing a number of coefficient update routines, including, but not limited to an LMS coefficient update process and a normalized LMS coefficient update process. | 12-11-2008 |
20090028366 | HEARING AID WITH ADAPTIVE FEEDBACK SUPPRESSION - A hearing aid comprises an input transducer ( | 01-29-2009 |
20090028367 | HEARING AID AND METHOD FOR CONTROLLING SIGNAL PROCESSING IN A HEARING AID - A hearing aid comprises a signal path for receiving at least one audio input signal and autocorrelation index (ACI) estimating means ( | 01-29-2009 |
20090034768 | System and Method for Eliminating Feedback and Noise In a Hearing Device - This invention relates to a system ( | 02-05-2009 |
20090041272 | Method for operation of a hearing device system and hearing device system - There is described a method for operation of a hearing device system with two microphones arranged spatially separated from one another and with sound-generating output units assigned to these microphones, in which, by comparison of the microphone signals or of signals derived therefrom, feedback is detected, and on detection of the feedback measures are initiated for reducing the feedback, and with the comparison of the microphone signals or of signals derived therefrom comprising a frequency-selective power comparison. There is also described a hearing device system suitable for this method. | 02-12-2009 |
20090052708 | Hearing aid with anti-feedback - Disclosed is a hearing aid, where at least part of the hearing aid is adapted to be inserted into an ear canal of a user such that one end of the hearing aid and the tympanic membrane in the ear canal define a residual space of the ear canal, the hearing aid comprising an ambient space input transducer adapted to convert ambient sound to an electric sound signal, when the ambient sound reaches the ear of a user from an ambient space, a processor connected to said ambient space input transducer and adapted to process said electric sound signal, an output transducer connected to said processor and adapted to convert said processed electric sound signal to a sound pressure in the residual space of the ear canal, and wherein the hearing aid further comprises a residual space input transducer connected to said processor and arranged to predominantly receive said sound pressure in the residual space, and wherein the residual space input transducer is adapted to convert said sound pressure to an electric residual space signal for compensating acoustic feedback. | 02-26-2009 |
20090067654 | HEARING AID AND METHOD OF ESTIMATING DYNAMIC GAIN LIMITATION IN A HEARING AID - There is presented a hearing aid that comprises an input transducer for transforming an acoustic input signal into an electrical input signal, a compressor for generating an electrical output signal from the electrical input signal, an output transducer for transforming the electrical output signal into an acoustic output signal, an autocorrelation estimator for calculating an autocorrelation estimate of the electrical input signal, and an acoustic loop gain estimator for determining a dynamic gain limit from the autocorrelation estimate and an instantaneous gain level of the signal processor. The invention further provides a method of adjusting signal path gain in a hearing aid, and a system for providing increased stability in a hearing aid. | 03-12-2009 |
20090097681 | Multifunction System and Method for Integrated Hearing and Communication with Noise Cancellation and Feedback Management - Systems, devices and methods for communication include an ear canal microphone configured for placement in the ear canal to detect high frequency sound localization cues. An external microphone positioned away from the ear canal can detect low frequency sound, such that feedback can be substantially reduced. The canal microphone and the external microphone are coupled to a transducer, such that the user perceives sound from the external microphone and the canal microphone with high frequency localization cues and decreased feedback. Wireless circuitry can be configured to connect to many devices with a wireless protocol, such that the user can receive and transmit audio signals. A bone conduction sensor can detect near-end speech of the user for transmission with the wireless circuitry in noisy environment. Noise cancellation of background sounds near the user can improve the user's hearing of desired sounds. | 04-16-2009 |
20090123010 | HEARING DEVICE WITH AN OPEN EARPIECE HAVING A SHORT VENT - The present invention relates to a new type of hearing device housing having an open canal section that is adapted for fitting in the ear canal of a wearer and having a short vent, the longitudinal extension of which is shorter than the longitudinal extension of the open canal section, and an output port for emission of sound towards the eardrum of the wearer when inserted in the ear canal, and an outer ear section for accommodation of electronic components and being attached to the canal section and adapted for positioning in front of the ear during use, the short vent reducing the occlusion effect, wherein the canal section comprises an open and flexible earpiece manufactured in standard sizes. | 05-14-2009 |
20090123011 | Ear mold with vent opening through outer ear and corresponding ventilation method - A method and hearing aid mold are provided for a hearing device with a first segment for insertion into the auditory canal of the user, a second segment, which projects into the concha of the user when inserted, and a vent, which runs from the first segment into the second segment. A vent opening, which may be enclosed by a titanium ring, is directed in the second segment toward the outer ear of the user, so that an exchange of air can be achieved between the auditory canal and the rear of the outer ear through an opening in the outer ear. Ventilation of the auditory canal from the rear of the outer ear reduces the risk of feedback. | 05-14-2009 |
20090175474 | OUTPUT PHASE MODULATION ENTRAINMENT CONTAINMENT FOR DIGITAL FILTERS - Method and apparatus for entrainment containment in digital filters using output phase modulation. Phase change is gradually introduced into the acoustic feedback canceller loop to avoid entrainment of the feedback canceller filter. Various embodiments employing different output phase modulation approaches are set forth and time and frequency domain examples are provided. Additional method and apparatus can be found in the specification and as provided by the attached claims and their equivalents. | 07-09-2009 |
20090196445 | LISTENING SYSTEM WITH AN IMPROVED FEEDBACK CANCELLATION SYSTEM, A METHOD AND USE - The invention relates to a listening system comprising a first input transducer for converting an input sound to an electrical input signal, the electrical input signal comprising a direct part and an acoustic feedback part, an output transducer for converting an electrical output signal to an output sound, a forward path being defined between the input and output transducer and comprising a signal processing unit, a feedback cancellation system for estimating acoustic feedback comprising an adaptive FBC filter arranged in parallel to the forward path, the adaptive FBC filter comprising a variable FBC filter part and an FBC update algorithm part for updating the variable FBC filter part, the FBC update algorithm part comprising first and second FBC algorithm input signals influenced by the electrical input and output signals, respectively, the first and second FBC update algorithm input signal paths comprising first and second variable filters, respectively, the listening system further comprising an electrical update signal essentially consisting of said direct part of said electrical input signal. The invention further relates to a method of improving feedback cancellation and to use of a listening system. The object of the present invention is to provide an alternative scheme for improving acoustic feedback cancellation. The problem is solved in that said first and second variable filters are adapted to be updated on the basis of said electrical update signal. An advantage of the invention is that a desired tone in the input signal is not substantially affected by the feedback cancellation system. The invention may e.g. be used in listening devices comprising active feedback cancellation, e.g. hearing aids, active ear protection devices, etc. | 08-06-2009 |
20090238387 | Method for actively reducing occlusion comprising plausibility check and corresponding hearing apparatus - Adaption of signal processing for actively reducing occlusion in hearing apparatuses, and in particular in hearing aids, is to be automated further. For this purpose, a transducer transmission function, which is defined for the transmission path from the input of a receiver via the auditory canal to the output of a microphone, be subjected to an automatic plausibility check. An adjustable filter via which the microphone signal is fed back is only altered if the transducer transmission function is plausible according to a predefined criterion. Disadvantageous convergences of the adaptation algorithm can be avoided hereby and unnecessarily high computing times can be prevented. | 09-24-2009 |
20090245552 | APPARATUS AND METHOD FOR DYNAMIC DETECTION AND ATTENUATION OF PERIODIC ACOUSTIC FEEDBACK - A method for processing signals including an input, an output and a signal processor, comprising detecting a first periodic signal received at an input, adjusting frequency or phase of the first periodic signal in response to detecting the first periodic signal, comparing an amplitude of the first periodic signal before adjusting the frequency or phase to the amplitude after adjusting the frequency or phase to produce a first amplitude change and determining whether the first periodic signal is an acoustic feedback signal based on the first amplitude change. Apparatus including signal processing electronics to receive an input signal from a microphone and programmed to provide phase or frequency changes to signals in a processing channel and to detect periodic feedback signals based on the changes of signals in the processing channel, and a speaker. Variations include feedback reduction or cancellation systems and phase or frequency adjustment systems. | 10-01-2009 |
20090268933 | HEARING SYSTEM WITH ENHANCED NOISE CANCELLING AND METHOD FOR OPERATING A HEARING SYSTEM - The hearing system ( | 10-29-2009 |
20090290735 | Concha/open canal hearing aid apparatus and method - An improved hearing aid and method that employs a combination microphone/speaker, sized to have the microphone inserted within the concha bowl of the outer ear and the speaker is inserted within which the opening of the ear canal such that it does not obstruct the same for more natural hearing. | 11-26-2009 |
20090310805 | HEARING AID WITH ANTI-OCCLUSION EFFECT TECHNIQUES AND ULTRA-LOW FREQUENCY RESPONSE - An occluding hearing aid having anti-occlusion effect techniques combined with at least one improvement which, in the preferred embodiment, includes enhancement of acoustic output in the lower-midrange and bass frequency regions, typically between substantially 40 and 500 Hz, which regions are crucial for natural reproduction of multimedia sound and music but are not optimally processed, and generally not provided at all, in prior art hearing aids in order to avoid exacerbation of the occlusion effect. In specific embodiments, the hearing aid of the present invention includes primary or first microphone exposed to external sound plus a secondary or second microphone exposed to sound within an ear canal, in which a signal produced by the secondary microphone is applied as negative feedback to an input of a non-gain controlling signal process and amplifier driving a hearing aid receiver (transducer), whereby, it has been determined by the present inventor, the occlusion effect may be substantially canceled. The hearing aid further comprises at least one of ten combinational improvements each providing substantial performance benefits over known techniques and devices. | 12-17-2009 |
20090323993 | HEARING AID WITH A REMOVABLY CONNECTED ELONGATE MEMBER - The present invention relates to a new type of hearing aid with a housing that is adapted for positioning in the ear canal of a user and attached to an elongate member that is adapted for positioning in the pinna outside the ear canal of the user. The elongate member is adapted for removable interconnection with the hearing aid the housing of which is adapted for positioning in the ear canal of a user and accommodates a signal processor for processing an audio signal into an audio signal compensating a hearing loss and a receiver that is connected to an output of the signal processor for converting the processed compensated audio signal into a sound signal. | 12-31-2009 |
20100002896 | Hearing Aid Having an Occlusion Reduction Unit and Method for Occlusion Reduction - A method is described for reduction of occlusion effects in an acoustic appliance which closes an auditory channel, wherein an audio signal in the transmission path of the acoustic appliance is processed by a signal processing unit and is emitted via an output transducer, which is arranged in the auditory channel, as an acoustic signal. A resultant sound signal is then detected by an auditory channel microphone and is supplied to a variable loop filter, which is arranged in a feedback loop of an occlusion reduction unit for the acoustic appliance. The output signal from the loop filter is injected into the transmission path of the audio signal. The occlusion reduction unit is in this case controlled adaptively, with at least one signal from the transmission path of the audio signal and/or from the feedback loop being used to control the loop filter for the occlusion reduction unit. | 01-07-2010 |
20100020995 | SYSTEM FOR REDUCING ACOUSTIC FEEDBACK IN HEARING AIDS USING INTER-AURAL SIGNAL TRANSMISSION, METHOD AND USE - The invention relates to a hearing aid system comprising first and second spatially separated hearing instruments, the system being adapted for processing input sounds to output sounds according to a user's needs. The invention further relates to a method and use. The object of the present invention is to provide an alternative scheme for reducing the effect of acoustic feedback in a hearing aid system. The problem is solved in that the hearing instruments comprises, respectively, first and second input transducers for converting a first input sound to first and second electric input signal, and first and second output transducers for converting first and second processed electric output signal to first and second output sounds, wherein the system is adapted to provide that a first Tx-signal originating from the first electric input signal of the first hearing instrument is transmitted to the second hearing instrument and used in the formation of the second processed electric output signal, and that a second Tx-signal originating from the second electric input signal of the second hearing instrument is transmitted to the first hearing instrument and used in the formation of the first processed electric output signal. This has the advantage of providing a scheme for reducing or effectively eliminating acoustic feedback in a pair of hearing instruments. The invention may e.g. be used in listening devices, e.g. hearing aids, head sets, or active ear plugs. | 01-28-2010 |
20100020996 | CODEBOOK BASED FEEDBACK PATH ESTIMATION - The invention relates to a hearing instrument for processing an input sound to an output sound according to a user's needs. The invention further relates to a method of operating a hearing instrument and to use of a hearing instrument. The object of the present invention is to provide an alternative scheme for handling acoustic feedback in a hearing instrument. The problem is solved in that an input transducer for converting an input sound to an electric input signal and an output transducer for converting a processed electric output signal to an output sound, a forward path being defined between the input transducer and the output transducer, a feedback cancellation system for estimating the effect of acoustic feedback from the output transducer to the input transducer, the feedback cancellation system comprising a variable pre-estimated filter and a memory wherein a number of predetermined feedback channel impulse responses corresponding to a number of acoustic environments where substantial feedback is experienced are stored, and wherein the hearing instrument comprises a monitoring unit that—based on the current acoustic environment—is adapted to choose the currently most appropriate impulse response of the variable pre-estimated filter among the stored impulse responses. This has the advantage of providing a scheme for handling acoustic feedback that can adapt relatively fast to changing acoustic environments. The invention may e.g. be used in listening devices, such as hearing aids, head sets or active ear plugs, wherein customized feedback compensation is an issue. | 01-28-2010 |
20100027823 | Hearing aid having an occlusion reduction unit and method for occlusion reduction - A method is described for reduction of occlusion effects in an acoustic appliance which closes an auditory channel, wherein an audio signal in the transmission path of the acoustic appliance is processed by a signal processing unit and is emitted via an output transducer, which is arranged in the auditory channel, as an acoustic signal. A resultant sound signal is then detected by an auditory channel microphone and is supplied to a variable loop filter which is arranged in a feedback loop of an occlusion reduction unit for the acoustic appliance, whose output signal is injected into the transmission path of the audio signal. In this case, the loop filter is readjusted as a function of information from the signal processing unit. | 02-04-2010 |
20100034407 | ARRANGEMENT AND METHOD FOR REGULATION OF FEEDBACK SUPPRESSION IN HEARING DEVICES - The invention specifies a hearing device, especially an in-the-ear hearing aid, and a method for suppressing acoustic feedback, with at least one ultrasound signal being emitted by the hearing device. The ultrasound signal reflected and fed back from the environment of the hearing device is picked up by at least one microphone and/or by at least one ultrasound receive unit of the hearing device. A feedback suppression unit of the hearing device is regulated by the picked up and evaluated ultrasound signal. The advantage of this is that feedback suppression in hearing devices can be regulated both quickly and also precisely. | 02-11-2010 |
20100150388 | METHOD FOR FEEDBACK CANCELLING IN A HEARING DEVICE AND A HEARING DEVICE - A method and a hearing device for cancelling or preventing feedback are disclosed. The hearing device comprises a microphone ( | 06-17-2010 |
20100177917 | ADAPTIVE FEEDBACK GAIN CORRECTION - A hearing aid includes a signal processor, a input transducer electrically connected to the signal processor, a receiver electrically connected to the signal processor, an adaptive feedback cancellation filter configured to suppress feedback from a signal path between the receiver and the input transducer, and a feedback gain correction unit configured for adjusting a gain parameter of the signal processor based at least in part on coefficients of the adaptive feedback cancellation filter. A method of adjusting a gain parameter of a signal processor of a hearing aid includes monitoring filter coefficients of a feedback cancellation filter of the hearing aid, and adjusting the gain parameter of the signal processor in dependence of the monitored filter coefficients. | 07-15-2010 |
20100177918 | Device and Method to reduce Ear Wax Clogging of Acoustic Ports, Hearing Aid Sealing System, and Feedback Reduction System - At least one exemplary embodiment that is directed to a conformal hearing aid comprising: a hearing aid body, where the hearing aid body houses a microphone and a receiver, where the microphone is positioned within the hearing aid body to measure acoustic signals from an ambient environment, and where the receiver is positioned within the hearing aid body to emit acoustic signals toward a tympanic membrane of a user; an expandable element, where the expandable element is operatively connected to the hearing aid body, and where the expandable element is configured to encompass a circumferential portion of the hearing aid body when expanded; and an inflation management system, where the inflation management system is configured to expand the expandable element when actuated. | 07-15-2010 |
20100202641 | HEARING DEVICE WITH ADAPTIVE FEEDBACK SUPPRESSION - This invention relates to a hearing device for compensating hearing impairment of a user. The hearing device comprises an input signal converter for converting an acoustic signal to an electric signal, a signal processor, an output signal converter for converting a processed signal to a processed acoustic signal presented to the user, and an adaptive feedback suppression unit compensating for acoustic feedback between the output signal converter and the input signal converter and to generate a feedback compensation signal, which is mixed with the electric signal from the input signal converter to provide a compensated electric signal. The signal processor is adapted to process the compensated electric signal and to generate a processed signal therefrom. The hearing device further comprises an open loop approximation unit adapted to monitor relation between the compensated electric signal and the processed signal, and adapted to generate a control signal based on the relation, the control signal controlling the signal processor and/or the adaptive feedback suppression unit. | 08-12-2010 |
20100226516 | METHOD FOR OPERATING A HEARING APPARATUS, COMPUTER PROGRAM PRODUCT FOR IMPLEMENTING THE METHOD AND HEARING APPARATUS WITH FEEDBACK SUPPRESSION - A method for operating a hearing apparatus includes determining feedback events, in which feedback suppression responds and/or in which feedback is detected above a predeterminable feedback threshold value, determining a frequency of the feedback events within a predeterminable duration and emitting a signal if the determined frequency exceeds a predeterminable frequency threshold value. A time instant for changing an earmold which is no longer optimally positioned and is the cause of a frequent feedback can therefore be advantageously predicted in a timely manner. A computer program product for implementing the method and a hearing apparatus with acoustic feedback suppression and/or acoustic feedback identification, are also provided. | 09-09-2010 |
20100232634 | ONLINE ANTI-FEEDBACK SYSTEM FOR A HEARING AID - The invention relates to a hearing aid system comprising an input transducer, a forward path, an output transducer and an electrical feedback path, the forward path comprising a signal processing unit for modifying an electrical input signal to a specific hearing profile over a predefined frequency range, wherein the predefined frequency range comprises a number of frequency bands, for which maximum forward gain values IG | 09-16-2010 |
20100246868 | METHOD FOR OPERATING A HEARING APPARATUS WITH AMPLIFIED FEEDBACK COMPENSATION AND HEARING APPARATUS - The goal is to make insertion of a hearing apparatus in an ear more comfortable, in particular with respect to feedback whistling. A method for operating a hearing apparatus by amplifying an input sound to form an output sound and compensating by a predefined amount for feedback caused by the output sound is therefore provided. In a predetermined period after switching on the hearing apparatus, the amount of feedback compensation is automatically increased by an offset greater than zero compared with the predefined amount. By way of example, amplified feedback, which is caused by a hand when inserting the hearing apparatus or hearing aid into the ear, can be better compensated thereby. Feedback whistling when inserting a hearing aid for example can thus be avoided. | 09-30-2010 |
20100254555 | HEARING AID SYSTEM WITH FEEDBACK ARRANGEMENT TO PREDICT AND CANCEL ACOUSTIC FEEDBACK, METHOD AND USE - The invention relates to a hearing aid system with an electrical feedback cancellation path, for compensating acoustic feedback between an output transducer and an input transducer by subtracting an estimate of the acoustical feedback from a signal on the input side of the amplifier part, the electrical feedback cancellation path comprising an adaptive filter for providing a variable filtering function. The invention further relates to a method of compensating acoustic feedback in a hearing aid system and to its use. The object of the present invention is to provide an alternative scheme for estimating the acoustical/mechanical feedback in a hearing aid. The problem is solved in that the hearing aid system comprises a second electrical input signal consisting essentially of the direct part of said first electrical input signal (i.e. without acoustic feedback), and wherein the second electrical input signal is used to influence, preferably enhance, the filtering function of the adaptive filter of the feedback cancellation path. Preferably, the system comprises a second input transducer for generating the second electrical input signal, the second input transducer being spatially located at a position where the amplitude of the acoustical signal from the output transducer at a given frequency is smaller than at the location of the first input transducer, and wherein the electrical signal of the second input transducer is used to adapt the filtering function of the adaptive filter. Preferably, the signal path comprises a generator of an electrical probe signal for use in characterizing the feedback path. The invention may e.g. be used in binaural hearing aid systems or in connection with other electronic devices comprising a second electrical input signal, e.g. generated by a microphone separately located from a first microphone of the hearing aid. | 10-07-2010 |
20100260365 | Configuration and Method for Detecting Feedback in Hearing Devices - A configuration and associated methods are used for detecting acoustic feedback in a hearing device. One embodiment contains a first feedback detection unit, which determines the probability of feedback, a second feedback detection unit, which determines a weighting factor, and an arithmetic unit, which multiplies the feedback probability by the weighting factor. As an alternative to determining the weighting factor, a threshold value may also be controlled. This offers the advantage of improved acoustic feedback detection by a combination of two different feedback detection methods. | 10-14-2010 |
20100296680 | METHOD FOR DETERMINING A MAXIMUM GAIN IN A HEARING DEVICE AS WELL AS A HEARING DEVICE - A method for determining a maximum gain is disclosed that is applicable in a forward signal path starting at a microphone ( | 11-25-2010 |
20100310103 | METHOD FOR DETERMINING OF FEEDBACK THRESHOLD IN A HEARING DEVICE AND A HEARING DEVICE - A method for determining feedback thresholds in a plurality of frequency bands and/or at a plurality of frequencies processed by a hearing device is disclosed. The feedback thresholds are defined as gains, at which feedback occurs while a hearing device user is wearing the hearing device. The method comprises the step of determining feedback thresholds in an order of precedence, wherein the order of precedence being defined according to a degree of importance that the feedback threshold is determined in a particular frequency band or at a particular frequency, respectively. | 12-09-2010 |
20100329493 | HEARING APPARATUS AND METHOD FOR SUPPRESSING FEEDBACK IN A HEARING APPARATUS - A hearing apparatus and an associated method for suppressing feedback include a microphone emitting a microphone signal and a receiver picking up a receiver signal by subtracting a compensation signal from the microphone signal. The hearing apparatus includes a number of preset static first compensation filters for forming first compensation signals from the receiver signal and a first selection unit, which selects a first compensation signal in such a way that a feedback signal caused by the feedback is minimal in the receiver signal. An advantage thereof is that adaptation artifacts cannot occur. | 12-30-2010 |
20110026746 | METHOD FOR DETERMINING OF FEEDBACK THRESHOLD IN A HEARING DEVICE AND A HEARING DEVICE - A method for determining feedback thresholds in a plurality of frequency bands and/or at a plurality of frequencies processed by a hearing device is disclosed. The feedback thresholds are defined as gains, at which feedback occurs while a hearing device user is wearing the hearing device. The method comprises the steps of determining a quality index for a measured feedback threshold, and considering a measured feedback threshold as final if the quality index meets minimum predefined requirements. | 02-03-2011 |
20110116667 | METHOD AND APPARATUS TO REDUCE ENTRAINMENT-RELATED ARTIFACTS FOR HEARING ASSISTANCE SYSTEMS - A system providing method and apparatus to detect occurrence of an entrainment artifact and address it. The system analyzing a feedback canceller filter for certain characteristics that are associated with an entrained filter. When an entrained filter is detected, the feedback canceller filter is reset to a good filter that ideally represents the current approximate external acoustic feedback path without the characteristics of the entraining signal. | 05-19-2011 |
20110150257 | ADAPTIVE FEEDBACK CANCELLATION BASED ON INSERTED AND/OR INTRINSIC CHARACTERISTICS AND MATCHED RETRIEVAL - The invention relates to an audio processing system for processing an input sound to an output sound. The invention further relates to a method of estimating a feedback transfer function in an audio processing system. The object of the present invention is to provide an alternative scheme for minimizing feedback in audio processing systems. The problem is solved in that the audio processing system comprises an input transducer for converting an input sound to an electric input signal and defining an input side, an output transducer for converting a processed electric output signal to an output sound and defining an output side, a forward path being defined between the input transducer and the output transducer, and comprising a signal processing unit adapted for processing an SPU-input signal originating from the electric input signal and to provide a processed SPU-output signal, and an electric feedback loop from the output side to the input side comprising a feedback path estimation unit for estimating an acoustic feedback transfer function from the output transducer to the input transducer, and a enhancement unit for estimating noise-like signal components in the electric signal of the forward path and providing a noise signal estimate output, wherein the feedback path estimation unit is adapted to use the noise signal estimate output in the estimation of the acoustic feedback transfer function. This has the advantage of providing an adaptive feedback cancellation system which is robust in situations with a high degree of correlation between the output signal and the input signal of an audio processing system, e.g. a listening device. The invention may e.g. be used in public address systems, entertainment systems, hearing aids, head sets, mobile phones, wearable/portable communication devices, etc. | 06-23-2011 |
20110188685 | METHOD FOR THE DETECTION OF WHISTLING IN AN AUDIO SYSTEM - A method for detecting whistling in an audio system includes determining an average frequency of an input signal of the audio system, sampling the input signal in consecutive blocks of at least one sample, wherein the average frequency is determined blockwise, and determining whether feedback related whistling is present in the input signal of the audio system by evaluating a stability of the average frequency, wherein the evaluation of the stability of the average frequency comprises: determining a difference of two values of the determined average frequency for two blocks, and comparing the determined difference to a first threshold value. | 08-04-2011 |
20110188686 | METHOD FOR SUPPRESSING ACOUSTIC FEEDBACK IN A HEARING DEVICE AND CORRESPONDING HEARING DEVICE - A hearing device (HD) incorporates a method for adaptive cancellation of acoustic feedback (AF). The method comprises generating an estimated feedback signal (EF) and subtracting the estimated feedback signal (EF) from the microphone signal (MS) before feeding it to a signal processor (SP) providing the primary hearing device function. The estimated feedback signal (EF) is generated in an adaptive filter (FE | 08-04-2011 |
20110194714 | HEARING DEVICE WITH FREQUENCY SHIFTING AND ASSOCIATED METHOD - A hearing device has a feedback suppression unit. The hearing device further has a low-pass filter characterized by a first cut-off frequency, which couples out a low-frequency signal component from an output signal of the hearing device, and a high-pass filter characterized by a second cut-off frequency, which couples out a high-frequency signal component from the output signal of the hearing device. A frequency shift unit shifts the frequency of the high-frequency signal component to higher frequencies. A gap exists between the first and the second cut-off frequency. As a result of the different limit frequencies, signal distortions caused by frequency shifts are effectively suppressed. Feedback is suppressed continuously and rapidly at higher frequencies. | 08-11-2011 |
20110194715 | METHOD FOR COMPENSATING FOR A FEEDBACK SIGNAL, AND HEARING DEVICE - Feedback in a hearing device and, more particularly, in a hearing aid should be compensated for before it becomes audible. To this end, a method is proposed for compensating for a feedback signal in a hearing device with an input-transducer apparatus, a signal-processing apparatus and an output-transducer apparatus, in which method a feedback signal is compensated for, which feedback signal is fed back to the input-transducer apparatus from the output-transducer apparatus or the signal-processing apparatus. More particularly, a probability of having a plurality of notches, equally spaced apart from one another, in the spectrum of an input signal is established, which input signal originates directly from the input-transducer apparatus or which is a difference signal between the signal directly from the input-transducer apparatus and a compensation signal serving for compensation. The compensation is modified or the signal-processing apparatus is amplified as a function of this established probability. | 08-11-2011 |
20110211715 | HEARING DEVICE WITH FEEDBACK-REDUCTION FILTERS OPERATED IN PARALLEL, AND METHOD - A hearing device has a signal-processing apparatus for processing an input signal into an output signal, and a feedback-canceller apparatus for reducing feedback artifacts on the basis of the input signal and the output signal. The feedback-canceller apparatus has an adaptive, first filter, for establishing a set of filter coefficients for a predefined feedback situation. The feedback-canceller apparatus is configured to store the set of filter coefficients. It has at least one second filter, which can be operated directly parallel to the first filter on the basis of the stored set of filter coefficients. The adaptive, first filter can be continuously adapted to a current feedback situation, and the feedback-canceller apparatus is configured such that in the current feedback situation it automatically selects either the first or the second filter. As a result, it generally only requires a simple switchover, but not a complete adaptation. | 09-01-2011 |
20110249846 | METHODS AND APPARATUS FOR ALLOCATING FEEDBACK CANCELLATION RESOURCES FOR HEARING ASSISTANCE DEVICES - Disclosed herein, among other things, are methods and apparatus for allocating feedback cancellation resources for improved acoustic feedback cancellation for hearing assistance devices. In various embodiments, a hearing assistance device includes a microphone and a processor configured to receive signals from the microphone and process them according to a plurality of processing blocks. The processor is adapted to include an event detector that can provide detection of an event and an output to adjust one or more processing blocks of the overall process to more efficiently use resources of the processor for the event detected, in various embodiments. | 10-13-2011 |
20110249847 | METHODS AND APPARATUS FOR EARLY AUDIO FEEDBACK CANCELLATION FOR HEARING ASSISTANCE DEVICES - Disclosed herein, among other things, are methods and apparatus for improved feedback cancellation for hearing assistance devices. In various embodiments the present acoustic feedback cancellation system is configured to identify the onset of acoustic feedback. This early detection is accomplished in a variety of ways, including detection of an exponential rise in a periodic signal which is associated with early acoustic feedback. The present system is very rapid and so it can operate when the conditions surrounding the hearing aid change quickly. It also is useful to not impose feedback cancellation to longer notes that will “fool” less sophisticated acoustic feedback cancellers into thinking the sound is feedback. | 10-13-2011 |
20110293124 | FITTING DEVICE AND A METHOD OF FITTING A HEARING DEVICE TO COMPENSATE FOR THE HEARING LOSS OF A USER; AND A HEARING DEVICE AND A METHOD OF REDUCING FEEDBACK IN A HEARING DEVICE - A fitting device for fitting a hearing device to compensate for a hearing loss of a user is disclosed, the hearing device comprising a receiver and a microphone, wherein a feedback path exists between the receiver and the microphone, wherein the hearing device further comprises an adaptive feedback canceller configured to reduce feedback, the adaptive feedback canceller comprising a fixed filter corresponding to an invariant portion of the feedback path, and an adaptive filter corresponding to a variant portion of the feedback path, the fitting device comprising a processor configured to determine the invariant portion of the feedback path, wherein the processor is configured to provide the fixed filter with information relating to the invariant portion of the feedback path independently of the user using the hearing device. | 12-01-2011 |
20120140965 | ADAPTIVE FEEDBACK CANCELLATION BASED ON INSERTED AND/OR INTRINSIC CHARACTERISTICS AND MATCHED RETRIEVAL - The invention relates to an audio processing system for processing an input sound to an output sound. The invention further relates to a method of estimating a feedback transfer function in an audio processing system. The object of the present invention is to provide an alternative scheme for minimizing feedback in audio processing systems. The problem is solved in that the audio processing system comprises an input transducer for converting an input sound to an electric input signal and defining an input side, an output transducer for converting a processed electric output signal to an output sound and defining an output side, a forward path being defined between the input transducer and the output transducer, and comprising a signal processing unit adapted for processing an SPU-input signal originating from the electric input signal and to provide a processed SPU-output signal, and an electric feedback loop from the output side to the input side comprising a feedback path estimation unit for estimating an acoustic feedback transfer function from the output transducer to the input transducer, and a enhancement unit for estimating noise-like signal components in the electric signal of the forward path and providing a noise signal estimate output, wherein the feedback path estimation unit is adapted to use the noise signal estimate output in the estimation of the acoustic feedback transfer function. This has the advantage of providing an adaptive feedback cancellation system which is robust in situations with a high degree of correlation between the output signal and the input signal of an audio processing system, e.g. a listening device. The invention may e.g. be used in public address systems, entertainment systems, hearing aids, head sets, mobile phones, wearable/portable communication devices, etc. | 06-07-2012 |
20120148078 | METHOD AND HEARING DEVICE FOR SETTING FEEDBACK SUPPRESSION - A method and an associated hearing device are enabled for setting feedback suppression. The method includes determining feedback events, determining the frequency of the feedback events within a prescribed first period of time, and setting feedback suppression in accordance with the frequency of the feedback events. The hearing device is able to choose automatically between different feedback algorithms in accordance with the specific feedback situation so that an optimal sound and feedback quality can be achieved. | 06-14-2012 |
20120195450 | METHOD FOR CONTROL OF ADAPTATION OF FEEDBACK SUPPRESSION IN A HEARING AID, AND A HEARING AID - A method for controlling adaptation of a feedback suppression filter in a hearing aid comprises the step of suspending the adaptation of the feedback suppression filter when the level of a hearing aid reference signal is below a predetermined threshold. The invention further provides a hearing aid with a feedback suppression filter and with means for suspending adaptation of the feedback suppression filter. | 08-02-2012 |
20120243716 | HEARING APPARATUS WITH FEEDBACK CANCELER AND METHOD FOR OPERATING THE HEARING APPARATUS - A hearing apparatus has artifact-free, fast feedback cancelation properties. The hearing apparatus has a first microphone coupled by way of a pre-whitening filter to a feedback canceler in a first hearing device. The hearing apparatus is configured to set a frequency response of the pre-whitening filter in dependence on a signal of a second microphone of the hearing apparatus. | 09-27-2012 |
20120308062 | DIRECT DRIVE MICRO HEARING DEVICE - A device and methods are provided for a hearing device. In one embodiment, a hearing device includes a microphone to receive sound, an interactive tip and actuator. The actuator can include an actuator element and preload force element to place the interactive tip in contact with a portion of an ear. The hearing device includes circuitry coupled to the microphone and actuator, the circuitry configured to process sound received by the microphone and drive the actuator based on processed sound, wherein the actuator drives the interactive tip relative to a portion of the ear based on one or more signals received from the circuitry. | 12-06-2012 |
20130108093 | INTEGRATED AUTOMATIC TELEPHONE SWITCH | 05-02-2013 |
20130108094 | METHOD FOR THE OPERATION OF A HEARING DEVICE AND HEARING DEVICE WITH VARIABLE FREQUENCY SHIFT | 05-02-2013 |
20130114837 | FEEDBACK SUPPRESSION DEVICE AND METHOD FOR PERIODIC ADAPTATION OF A FEEDBACK SUPPRESSION DEVICE - A method is provided for adapting a feedback suppression device of a hearing device to a given situation in order to improve the quality of feedback suppression in hearing devices and in hearing aids in particular. In the method an adaptation procedure of the feedback suppression device is periodically activated and adaptation of the feedback suppression device is performed regularly even if a feedback detector does not detect a feedback situation. A feedback suppression device for a hearing device is also provided. | 05-09-2013 |
20130259278 | AUTOMATIC RECONFIGURATION OF A HEARING ASSISTANCE DEVICE BASED ON BATTERY CHARACTERISTICS - Disclosed herein, among other things, are methods and apparatus for detecting battery chemistry or battery type and reconfiguring a hearing assistance device based on the detected battery. One aspect of the present subject matter relates to a method of operating a hearing assistance device having a battery. A voltage of the battery is detected at a predetermined load current and a battery chemistry or battery type is determined based on the detected voltage. An operating parameter of the hearing assistance device is adjusted based on the determined battery chemistry or battery type, in various embodiments. Examples of adjustments made based on the determined battery chemistry or battery type include gain, feedback cancellation (FBC) filter, self-diagnostic thresholds of the hearing assistance device, indicator loudness, low battery set point, or an end-of-discharge battery set point. | 10-03-2013 |
20130343587 | HEARING AID COMPRISING A FEEDBACK ALRAM - A hearing aid comprises a microphone configured to receive an acoustic input signal and convert the signal into an electric input signal, an audiological signal processing unit coupled to the microphone and configured to process the electric input signal to a processed signal, an amplifier coupled to the audiological signal processing unit and configured to amplify the processed signal to an amplified signal, and a receiver coupled to the amplifier and configured to transform the amplified signal into an acoustic output signal. The hearing aid further comprises a howl detector coupled to the signal processing unit and configured to detect the presence of a feedback howl originating from the hearing aid an analyzer coupled to the howl detector and configured to determine a value indicative of whether the feedback howl detected is potentially audible to a person neighbouring the user of the hearing aid. | 12-26-2013 |
20140003640 | Multifunction System and Method for Integrated Hearing and Communication with Noise Cancellation and Feedback Management | 01-02-2014 |
20140072156 | HEARING AID SYSTEM FOR REMOVING FEEDBACK NOISE AND CONTROL METHOD THEREOF - Provided is a hearing aid system including: a first processor that fast Fourier transforms N input signal tone data output from an input buffer memory, and then executes nonlinear compression; a second processor that inverse fast Fourier transforms amplitude spectrum data; an output buffer memory that stores the voice signal tone data, until the number of the voice signal tone data is N; and a digital-to-analog (D/A) converter that converts the digital voice signal tone data into an analog signal, to then output the analog signal to a receiver. Thus, certain ambient noise due to an acoustic feedback signal and a narrow frequency band that occur in a hearing aid is removed, to thus reduce discomforts due to the acoustic feedback noise of the hearing aid for hearing aid users, and to thereby significantly improve speech discrimination. | 03-13-2014 |
20140112508 | FITTING DEVICE AND A METHOD OF FITTING A HEARING DEVICE TO COMPENSATE FOR THE HEARING LOSS OF A USER; AND A HEARING DEVICE AND A METHOD OF REDUCING FEEDBACK IN A HEARING DEVICE - A fitting device for fitting a hearing device to compensate for a hearing loss of a user is disclosed, the hearing device comprising a receiver and a microphone, wherein a feedback path exists between the receiver and the microphone, wherein the hearing device further comprises an adaptive feedback canceller configured to reduce feedback, the adaptive feedback canceller comprising a fixed filter corresponding to an invariant portion of the feedback path, and an adaptive filter corresponding to a variant portion of the feedback path, the fitting device comprising a processor configured to determine the invariant portion of the feedback path, wherein the processor is configured to provide the fixed filter with information relating to the invariant portion of the feedback path independently of the user using the hearing device. | 04-24-2014 |
20140161292 | HEARING ASSISTANCE DEVICE WITH LOW PROFILE OFFSET SPOUT - Disclosed herein, among other things, are methods and apparatuses for hearing assistance low profile offset spouts. One aspect of the present subject matter relates to a hearing assistance spout consisting of a one-piece spout with a curved path to an off-axis (e.g., offset) port. The spout may be manufactured using metal injection molding to provide for a reflow solder attachment to the hearing assistance microphone. One aspect of the present subject matter relates to placing a full-sized spout off-axis while maintaining an open state that does not restrict the acoustic path, which may allow the offset spout to include a radial seal independent of the microphone body itself. One aspect of the present subject matter relates to an offset spout including a sealed acoustic barrier wall to protect the acoustic inlet of the microphone from debris or moisture. | 06-12-2014 |
20140177890 | Frequency Based Feedback Control - Disclosed herein is a feedback reduction system for used in a hearing prosthesis. The hearing prosthesis will receive an input signal, process the input signal, and create a transformed output. However, the hearing prosthesis may suffer from feedback. Thus, a system to minimize the feedback in a hearing prosthesis may be desirable. One system to minimize the feedback includes down-sample circuitry configured to down-sample a first signal, creating a down-sampled signal. They system also includes a filter circuit. The filter circuit filters both the first signal and the down-sampled signal. The filter will output a filtered signal and a filtered down-sampled signal, respectively. Additionally, the system features up-sample circuitry that up-samples the filtered down-sampled signal. The output of the up-sample circuitry is an up-sampled signal. Further, the system features combining circuitry that creates a feedback-reduced signal based on the up-sampled signal, the filtered signal, and an input signal. | 06-26-2014 |
20140185849 | HEARING AID WITH IMPROVED LOCALIZATION - A hearing aid includes: a feedback monitor connected to the adaptive feedback canceller and configured to monitor a state of feedback and having an output providing an indication of the state of feedback; and a cue controller connected to the feedback monitor and the at least one adaptive cue filter, and configured to control, in response to an output of the feedback monitor, the at least one adaptive cue filter so that the difference between the output of the at least one ITE microphone and the combined output of the at least one adaptive cue filter is reduced. | 07-03-2014 |
20140193010 | HEARING AID AND METHOD FOR ELIMINATING ACOUSTIC FEEDBACK IN THE AMPLIFICATION OF ACOUSTIC SIGNALS - In a hearing aid having a microphone to be arranged at a body of a user for capturing ambient sound, a loudspeaker for outputting the ambient sound after having been amplified on a frequency-dependent basis, and a signal processor, the signal processor is configured to amplify the sound such that the amplified sound is audible to the user, and to automatically re-adjust the gain by the following steps: selecting a tone having a specific frequency; outputting the tone and the amplified ambient sound via the loudspeaker as an output sound; capturing via said microphone an analysis sound composed of ambient sound and of a reflection of said output sound; extracting a reflection of the tone from the captured analysis sound; and determining a reflection component for the specific frequency of the tone; adjusting the gain in frequency-specific manner and based on the determined reflection component. | 07-10-2014 |
20140270291 | Fitting a Bilateral Hearing Prosthesis System - A hearing prosthesis system includes a processor arranged to communicate a stimulation signal to a vibration stimulator of a first hearing prosthesis. The processor receives an indication of a measured input signal from a first transducer of a second hearing prosthesis. A processor calculates a feedback associated with the stimulation. The processor may also be further configured to adjust a gain table or an input to a feedback reduction algorithm in response to the calculated feedback. Additionally, the processor of the hearing prosthesis system may also be arranged to communicate a second stimulation signal to a vibration stimulator of the second hearing prosthesis. The processor receives an indication of a measured input signal from the first hearing prosthesis. Further, the processor calculates a second feedback associated with the second stimulation. | 09-18-2014 |
20140270292 | Methods, Systems, and Devices for Detecting Feedback - Systems, methods, and devices are disclosed. An example sound processor is disclosed. The example sound processor includes a module configured to identify a feedback artifact in a current sample of an input spectral component by determining that a change in a signal level of an input spectral component is approximately equal to a predicted change. The predicted change may be based on one or more characteristics of an external feedback loop. Responsive to identifying the feedback artifact, the sound processor is further configured to apply a modification to a parameter used to process the input spectral component. The modification reduces a likelihood of including audible feedback in a processed input spectral component. | 09-18-2014 |
20140270293 | Systems, Devices, Components and Methods for Providing Acoustic Isolation Between Microphones and Transducers in Bone Conduction Magnetic Hearing Aids - Disclosed are various embodiments of systems, devices, components and methods for reducing feedback between a transducer and a microphone in a magnetic bone conduction hearing aid. Such systems, devices, components and methods include providing encapsulation compartments for the transducer and/or the microphone, and providing an acoustically-isolating housing for the microphone that is separate and apart from the main housing of the hearing aid. | 09-18-2014 |
20140348360 | HEARING AID WITH IMPROVED LOCALIZATION - A hearing aid includes: a BTE hearing aid housing configured to be worn behind a pinna of a user and accommodating at least one BTE sound input transducer configured for conversion of acoustic sound into a BTE audio sound signal; an ITE microphone housing configured to be positioned in an outer ear of the user and accommodating at least one ITE microphone configured for conversion of acoustic sound into an ITE audio sound signal and accommodated by the ITE microphone housing; a signal detector configured for determination of ITE signal magnitudes of the ITE audio sound signal at a plurality of frequencies, and determination of BTE signal magnitudes of the BTE audio sound signal at the plurality of frequencies; and a gain processor configured for determining gain values at respective frequencies of the plurality of frequencies based on the ITE signal magnitudes and the BTE signal magnitudes. | 11-27-2014 |
20140348361 | ENTRAINMENT AVOIDANCE WITH AN AUTO REGRESSIVE FILTER - A method of signal processing an input signal in a hearing aid to avoid entrainment, the hearing aid including a receiver and a microphone, the method comprising using an adaptive filter to measure an acoustic feedback path from the receiver to the microphone and adjusting an adaptation rate of the adaptive filter using an output from a filter having an autoregressive portion, the output derived at least in part from a ratio of a predictive estimate of the input signal to a difference of the predictive estimate and the input signal. | 11-27-2014 |
20140355802 | LISTENING SYSTEM WITH AN IMPROVED FEEDBACK CANCELLATION SYSTEM, A METHOD AND USE - A listening device includes an input transducer, an output transducer, a signal processor, and a feedback cancellation system for estimating acoustic feedback. The feedback cancellation system includes an adaptive FBC filter arranged in parallel to the forward path, an adaptive whitening filter, and a howl detection unit that performs howl detection based on an output of the adaptive whitening filter. The adaptive FBC filter includes a variable FBC filter part and an FBC update algorithm part for updating the variable FBC filter part, the FBC update algorithm part receiving first and second FBC algorithm input signals influenced by the electrical input and the electrical output signals. Further, the feedback cancellation system receives an electrical update signal essentially consisting of the direct part of the electrical input signal and coefficients of the adaptive whitening filter are based on the electrical update signal. | 12-04-2014 |
20140363036 | FEEDBACK PATH EVALUATION IMPLEMENTED WITH LIMTED SIGNAL PROCESSING - A method, including operating an adaptive system of a hearing prosthesis, and determining one or more feedback path parameters of the hearing prosthesis based on the operation of the adaptive system of the hearing prosthesis. | 12-11-2014 |
20150063614 | METHOD OF PERFORMING AN RECD MEASUREMENT USING A HEARING ASSISTANCE DEVICE - The application relates to a hearing assistance device and to a method of performing a real ear measurement. The method comprises providing a first controlled acoustic feedback path from an output transducer to a measurement input transducer via a standard acoustic coupler; generating a first probe signal; estimating and storing a first estimate of the first controlled acoustic feedback path; and providing a second controlled acoustic feedback path from the output transducer to the measurement input transducer via the residual volume between the ITE part of the hearing aid device and the user's eardrum; generating a second probe signal; estimating and storing a second estimate of the second controlled acoustic feedback path; and determining a real ear to coupler difference from said first and second acoustic feedback estimates. An alternative and relatively simple method of determining an RECD-value in hearing assistance device of a particular user is thereby provided. | 03-05-2015 |
20150078600 | HEARING ASSISTANCE DEVICE COMPRISING AN INPUT TRANSDUCER SYSTEM - The application relates to a hearing assistance device (HAD) comprising (a) an input transducer system comprising (a1) an audio input transducer (AIT), and (a2) a first supplementary input transducer (SIT | 03-19-2015 |
20150110318 | ELECTRONIC DEVICE - Provided is an electronic device including: a housing; a vibration body disposed in the housing; and a microphone disposed in the housing. By vibrating the vibration body, the electronic device transmits air conduction sound and vibration sound that is generated by the vibration. During the generation of the sounds, howling reduction processing is performed, so that usability of the electronic device is improved. | 04-23-2015 |
20150125015 | ADAPTIVE RESIDUAL FEEDBACK SUPPRESSION - 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. | 05-07-2015 |
20150139460 | HEARING DEVICE WITH ADAPTIVE FEEDBACK-PATH ESTIMATION - A hearing device comprises a feedback-path estimation unit, which adaptively estimates a feedback path from an output transducer to an input transducer, and sets an adaptation-step size of an adaptive feedback-path estimation algorithm in dependence on an estimate of a background-noise spectrum. The feedback-path estimation unit provides an estimation-control signal for generating an acoustic feedback-path estimation signal having an level spectrum, which has at least one first frequency band with non-zero level and at least one second frequency band with zero level or with a non-zero level smaller than the level in the first frequency band and smaller than a background-noise level in the respective second frequency band. Background noise is detected in the second frequency band while the feedback-path estimation signal is provided. The background-noise level in the at least one first frequency band is estimated for obtaining the estimate of the background-noise spectrum. A corresponding method is described. The method is e.g. useful for estimating a feedback path during fitting of a hearing device, e.g. a hearing aid, to a particular user's needs. | 05-21-2015 |
20150334492 | METHOD AND APPARATUS FOR OWN-VOICE SENSING IN A HEARING ASSISTANCE DEVICE - Disclosed herein, among other things, are methods and apparatus for own-voice sensing in hearing assistance devices. One aspect of the present subject matter includes an in-the-ear (ITE) hearing assistance device adapted to process sounds, including sounds from a wearer's mouth. According to various embodiments, the device includes a hollow plastic housing adapted to be worn in the ear of the wearer and a differential sensor mounted to an interior surface of the housing in an ear canal of the wearer. The differential sensor includes inlets located within the housing and the differential sensor is configured to improve speech intelligibility of sounds from the wearer's mouth, in various embodiments. | 11-19-2015 |
20160007126 | HEARING AID AND FEEDBACK CANCELLER - A hearing aid according to an embodiment of the present disclosure includes: a microphone configured to convert sound into an electric signal and output a first signal; a receiver configured to convert the third signal that is generated by performing predetermined hearing aid processing on a second signal, into sound; a first feedback removal unit having an adaptive filter configured to adaptively estimate a first transfer function of a sound feedback path from the receiver to the microphone; and a second feedback removal unit having a fixed filter configured to receive the third signal and use a fixed filter coefficient based on a second transfer function of a vibration feedback path from the receiver to the microphone. The second signal is generated by removing from the first signal, output signals from the adaptive filter and the fixed filter. | 01-07-2016 |
20160014531 | FEEDBACK PATH EVALUATION IMPLEMENTED WITH LIMTED SIGNAL PROCESSING | 01-14-2016 |
20160037269 | METHOD AND APPARATUS FOR FEEDBACK SUPPRESSION - A method and an apparatus reduce feedback in a hearing aid device. The method includes the step of acquiring a first feedback transfer function at a first point in time on a feedback path from a signal processing device via an electro-acoustic transducer, an acoustic signal path from the electro-acoustic transducer to an acousto-electric transducer and via the acousto-electric transducer back to the signal processing device. In a further step, a weighted mean value function is determined in a manner dependent on amplitude absolute values of the first feedback transfer function. A second feedback transfer function is estimated by an adaptive filter, wherein coefficients of the adaptive filter are determined in a manner dependent on the weighted mean value function. The adaptive filter is applied to a signal which is derived from an acoustic input signal of the acousto-electric transducer. | 02-04-2016 |
20160080875 | METHOD AND APPARATUS FOR FEEDBACK SUPPRESSION - A method and apparatus reduce feedback in a hearing aid. The method involves a first transfer function, which includes a feedback path, being estimated for a first section of a signal response. A power of a feedback signal from a second transfer function of the feedback path is estimated for a second section of the signal response, and a parameter of the signal processing device and/or of the feedback suppression unit is adjusted on the basis of the estimated power. | 03-17-2016 |
20160183010 | METHODS AND APPARATUS FOR ALLOCATING FEEDBACK CANCELLATION RESOURCES FOR HEARING ASSISTANCE DEVICES | 06-23-2016 |
20160255446 | Methods, Systems, and Devices for Adaptively Filtering Audio Signals | 09-01-2016 |