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7609841 |
Frequency shifter for use in adaptive feedback cancellers for hearing aids
A decorrelation method for improving feedback cancellation utilizes a small frequency shifting ratio, on the order of 0.3 percent. Frequency shifting is applied only to the high frequency portion...
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7596238 |
Howling margin measuring device
A howling margin measuring device 20 comprises processing means 28 composed of gain controlling means 21 and a compressor 22 which are connected in series and controlling means 23 . The...
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7529378 |
Filter for interfering signals in hearing devices
In a process for filtering interfering signals, occurring with largely known constant repetition frequency at the use of hearing devices in or at the hearing device the repetition frequency of the...
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7522739 |
Hearing aid with a switching device for switching on and off and corresponding method
It is intended that the switching on and off of a hearing aid (I) should be made more user-friendly. To this end the hearing aid (I) is fitted with a temperature sensor (TS) to detect the body heat...
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7522738 |
Dual feedback control system for implantable hearing instrument
The invention is directed to an implanted microphone having reduced sensitivity to vibration. In this regard, the microphone differentiates between the desirable and undesirable vibration by...
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7519193 |
Hearing aid circuit reducing feedback
A hearing aid circuit includes a correlation detector that detects correlation at a feedforward path input and that provides a correlation output to a phase shifter. The phase shifter introduces a...
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7463745 |
Phase based feedback oscillation prevention in hearing aids
A method for reducing oscillation of a feedback signal in a hearing aid and hearing aid configured according to the present method is provided. The method includes the steps of determining the...
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7400738 |
Acoustic module for a hearing aid device
An acoustic module for a hearing aid device has at least one microphone and at least one earphone (acoustic output transducer) combined together as a unit, the unit including a signal-processing...
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7386142 |
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,...
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7324651 |
Feedback suppression
Acoustical signals impinging on an input converter are converted into a first electric signal by a controllably variable transfer characteristic. The transfer characteristic is dependent on the...
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7308107 |
Method for activating a hearing device
A hearing device is activated by operating the hearing device in an operating mode in a first phase after supplying energy to internal circuitry of the hearing device, by operating the hearing...
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7302070 |
Oscillation detection
The invention relates to oscillation detection and, more particularly, concerns a method and apparatus for identifying oscillation in a signal due to feedback, permitting appropriate action to be...
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7292699 |
Band-limited adaptive feedback canceller for hearing aids
An improved method for adaptively cancelling acoustic feedback in hearing aids and other audio amplification devices. Feedback cancellation is limited to a frequency band that encompasses all...
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7254245 |
Circuit and method for adaptation of hearing device microphones
The microphones used in hearing devices normally possess different characteristic lines that are to be adapted to one another. For this purpose, the amplitude of an output signal of a first...
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7245732 |
Hearing aid
A digital hearing aid system includes a signal path with an input transducer, a signal processor and an output transducer, a part of the system being intended for delivering sound into an ear canal...
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7242781 |
Null adaptation in multi-microphone directional system
Improved approaches to adaptively suppress interfering noise in a multi-microphone directional system are disclosed. These approaches operate to adapt the direction null for the multi-microphone...
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7209568 |
Hearing aid having an adjustable directional characteristic, and method for adjustment thereof
In a hearing aid, as well as in a method for the operation of a hearing aid having a microphone system in which different directional characteristics can be set, the tonal quality is improved,...
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7203328 |
Hearing aid, and method for reducing feedback therein
Feedback reduction in hearing aids is simplified and improved in an amplification device that has two separate compensation paths, an acoustic input and an inductive input. In the first...
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7197152 |
Frequency response equalization system for hearing aid microphones
A system and method to compensate for changes in the frequency response of a microphone caused by factors interfering with the receipt of acoustic sound in the microphone. The system includes at...
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7181034 |
Inter-channel communication in a multi-channel digital hearing instrument
A multi-channel digital hearing instrument is provided that includes a microphone, an analog-to-digital (A/D) converter, a sound processor, a digital-to-analog (D/A) converter and a speaker. The...
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7174027 |
Feedback compensation device and method, and hearing aid device employing same
A feedback compensator for a hearing aid device has a filter arrangement that splits a signal path, to implement an adaptive feedback compensation with only one buffer memory, two splitting nodes,...
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7155022 |
Electromagnetic feedback reduction in communication device
The invention relates to a method for reducing feedback caused by electromagnetic interference between an induction coil and an output transducer, a voltage supply or an amplifier or a combination...
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7106871 |
Feedback cancellation using bandwidth detection
A method for canceling feedback in an acoustic system including a microphone, a signal path, a speaker and means for detecting presence of feedback between the speaker and the microphone, the...
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7092532 |
Adaptive feedback canceller
A system and method for adaptively removing feedback in audio systems and, more particularly, hearing aid systems. The audio system comprises an analysis unit, for receiving an input signal and...
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7068802 |
Method for the operation of a digital, programmable hearing aid as well as a digitally programmable hearing aid
A method for operating a digital, programmable hearing aid is provided that uses both a transmission characteristic of a normal amplification as well as a transmission characteristic of a maximum...
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7031482 |
Precision low jitter oscillator circuit
A precision, low jitter oscillator circuit is provided that is particularly well-suited for generating a clock signal in miniature digital systems, such as digital hearing aids. The oscillator...
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7020297 |
Subband acoustic feedback cancellation in hearing aids
A new subband feedback cancellation scheme is proposed, capable of providing additional stable gain without introducing audible artifacts. The subband feedback cancellation scheme employs a cascade...
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7013015 |
Method for the operation of a hearing aid device or hearing device system as well as hearing aid device or hearing device system
For reducing feedback-conditioned oscillations in a hearing aid device, microphone signals of a first microphone and of a distanced, second microphone are compared to one another. When oscillations...
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7010135 |
Method to determine a feedback threshold in a hearing device
A feedback threshold in a hearing device is determined by feeding an input signal to the hearing device while it is inserted in an ear canal of a user. The input signal results in a higher...
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6920227 |
Active noise suppression for a hearing aid device which can be worn in the ear or a hearing aid device with otoplastic which can be worn in the ear
In the case of a hearing aid device which can be worn in the ear or a hearing aid device with a otoplastic which can be worn in the ear, the penetration of direct sound through a ventilation...
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6898293 |
Hearing aid
The present invention relates to a hearing aid with an adaptive filter for suppression of acoustic feedback in the hearing aid. The hearing aid further comprises a controller that is adapted to...
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6895098 |
Method for operating a hearing device, and hearing device
A method for operating a hearing device ( 1 ) including the extraction, during an extraction phase, of characteristic features from an acoustical signal captured by at least one microphone ( 2 a ,...
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6888949 |
Hearing aid with adaptive noise canceller
A noise reduction system for a sound reproduction system, in particular for hearing aids, comprises a primary and a secondary microphone for producing input signals in response to sound in which a...
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6882736 |
Method for operating a hearing aid or hearing aid system, and a hearing aid and hearing aid system
In a method for operating a hearing aid or hearing aid system, and a hearing aid or hearing aid system, wind noises are detected by analyzing the output signals of at least two microphones. If wind...
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6831986 |
Feedback cancellation in a hearing aid with reduced sensitivity to low-frequency tonal inputs
A feedback cancellation system with reduced sensitivity to low-frequency tonal inputs is provided. Such a system can be used, for example, in a hearing aid to prevent cancellation of the desired...
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6813490 |
Mobile station with audio signal adaptation to hearing characteristics of the user
A method and apparatus for increasing the intelligibility of speech signals received by mobile stations via adapting some of the acoustic parameters of speech in the frequency domain. The mobile...
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6754356 |
Two-stage adaptive feedback cancellation scheme for hearing instruments
A feedback cancellation system for a hearing instrument is described. The feedback cancellation system includes both a constrained adaptive filter, the constrained adaptive filter can be...
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6671379 |
Ear microphone apparatus and method
An earset including a housing positionable with respect to an ear of a person, a microphone disposed with respect to the housing for insertion into the ear of a person, the microphone operable to...
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6647123 |
Signal processing circuit and method for increasing speech intelligibility
A signal processing circuit and method for increasing speech intelligibility. The invention comprises a receiving circuit for receiving an audio signal detectable by a human. A gain amplifying...
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6643378 |
Bone conduction hearing aid
A bone conduction hearing aid includes a vibrator carried by the insertion end of the hearing aid. When the hearing aid is inserted into the ear canal of a patient, the vibrator is positioned in...
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6611600 |
Circuit and method for the adaptive suppression of an acoustic feedback
A circuit for adaptive suppression of acoustic feedback forms part of a digital hearing aid, comprising a microphone ( 1 ), subtracter ( 3 ), hearing correcting means ( 4 ), receiver ( 6 ), delay...
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6563931 |
Auditory prosthesis for adaptively filtering selected auditory component by user activation and method for doing same
An auditory prosthesis, and method, which is able to adapt better to filter out a selected unwanted portion of the auditory input signal by relying on a human activation, such as activation by the...
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6498858 |
Feedback cancellation improvements
Feedback cancellation apparatus uses a cascade of two filters along with a short bulk delay. The first filter is adapted when the hearing aid is turned on in the ear. This filter adapts quickly...
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6434246 |
Apparatus and methods for combining audio compression and feedback cancellation in a hearing aid
The present invention combines audio compression and feedback cancellation in an audio system such as a hearing aid. The feedback cancellation element of the present invention uses one or more...
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6404895 |
Method for feedback recognition in a hearing aid and a hearing aid operating according to the method
In a method for feedback recognition in a hearing aid and a hearing aid operating according to the method, a frequency band is defined, a first signal level in the frequency band is determined, the...
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6347148 |
Method and apparatus for feedback reduction in acoustic systems, particularly in hearing aids
There is provided a method of controlling feedback in an acoustic system, for example a digital hearing aid, in which there is a potential feedback path between the output and the input. The method...
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6339647 |
Hearing aid with beam forming properties
A hearing aid with beam forming properties, having at least two microphone channels ( 1 a , 1 b ) for at least two microphones ( 2 a , 2 b ), the microphone channels each comprising an analog to...
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6173063 |
Output regulator for feedback reduction in hearing aids
In a hearing aid having feedback cancellation, a voltage regulator is provided to regulate the voltage from the hearing aid battery to the class D output. Feedback cancellation processing...
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6151400 |
Automatic sensitivity control
Again control arrangement for an auditory prosthesis, such as a hearing aid or cochlear prosthesis, is disclosed. The output of a controlled amplifier 11 is processed so as to derive an average...
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6137888 |
EM interference canceller in an audio amplifier
A problem in hearing aids or other audio/acoustic amplifier circuits is that external sources of EM energy may be coupled into the electronics of the hearing aid so as to contribute to the acoustic...
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