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7627129 |
Apparatus and method for suppressing feedback
An apparatus for suppressing feedback in an environment where a microphone and a loudspeaker are located, comprises a means for embedding a test signal into a loudspeaker signal, a microphone...
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7627287 |
On-channel repeater
An on-channel repeater has a receiving antenna for receiving an RF signal and a transmitting antenna for transmitting on the same frequency as the input signal. An amplification path between the...
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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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7602925 |
Audio feedback processing system
A signal processing system improves signal quality by accurately locating and eliminating a feedback signal in an input signal, such as an audio signal. The signal processing system interpolates...
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7552050 |
Speech recognition system and method utilizing adaptive cancellation for talk-back voice
A voice recognition system includes an adaptive filter and a subtractor. The adaptive filter generates a simulated talk-back voice y(n) by setting a filter coefficient simulating a transfer system...
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7542576 |
Howling detection circuit
In a howling detection circuit, an audio signal voltage generator generates an audio signal voltage based on a level of an input audio signal. A capacitor is chargeable and dischargeable by the...
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7542577 |
Input sound processor
An input sound processor compares power at each frequency component of an input sound with a reference value, and sets multiplication points indicating frequency components at which the total power...
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7515703 |
Method and system for determining conference call embellishment tones and transmission of same
A method for providing an embellishment representation of a noise information is discloses. The method comprises measuring a level of the background noise information, wherein the measured level is...
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7443989 |
Adaptive beamforming method and apparatus using feedback structure
An adaptive beamforming apparatus and method includes a fixed beamformer that compensates for time delays of M noise-containing speech signals input via a microphone array having M microphones (M...
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7415117 |
System and method for beamforming using a microphone array
The ability to combine multiple audio signals captured from the microphones in a microphone array is frequently used in beamforming systems. Typically, beamforming involves processing the output...
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7391877 |
Spatial processor for enhanced performance in multi-talker speech displays
Optimal head related transfer function spatial configurations designed to maximize speech intelligibility in multi-talker speech displays by spatially separating competing speech channels combined...
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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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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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7280958 |
Method and system for suppressing receiver audio regeneration
The invention concerns a method ( 500 ) and system ( 100 ) for suppressing receiver audio regeneration. The method ( 500 ) includes the steps of receiving a communication signal ( 502 ), at a Radio...
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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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7227959 |
Multi-channel digital feedback reducer system
The present invention provides method and apparatus that improve processing of acoustic signals by reducing acoustic feedback in an acoustic system. An aspect of the invention is a multi-channel...
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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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7203324 |
Audio feedback processing system
This invention is an audio system capable of identifying frequencies of feedback signals and filters these feedback signals. Frequency interpolation is utilized on a sampled frequency spectrum...
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7190800 |
Howling control device and howling control method
A howling control apparatus and howling control method for controlling time up to the cancellation of howling suppression according to a howling occurrence situation, thereby eliminating the...
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7162044 |
Audio signal processing
Systems, devices, and methods are provided to inhibit at least one feedback component of an input audio signal by adjusting a feedback-inhibiting filter through a narrowband subaudible signal. The...
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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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7136495 |
Loudspeaker device
A loudspeaker device comprising a power amplifier ( 13 ) to which an input signal is delivered via a subtracter ( 6 ), a speaker unit ( 1 ) for reproducing output signals delivered from the power...
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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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7068798 |
Method and system for suppressing echoes and noises in environments under variable acoustic and highly feedback conditions
Method and system for canceling echoes and noises in environments with variable acoustic conditions and high feedback, such as the interior of an automotive vehicle, permitting audible...
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7058185 |
Acoustic echo and noise cancellation
Stereo echo cancellation is necessary to overcome the objections observed by, for example, teleconferencing, voice controlled video/audio apparatuses, etc. To improve the existing filters, an...
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7054451 |
Sound reinforcement system having an echo suppressor and loudspeaker beamformer
A sound reinforcement system includes several microphones, a microphone beamformer coupled to the microphones, adaptive echo compensator (EC) coupled to the microphone beamformer for generating an...
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7027604 |
Circuit to prevent acoustic feedback for a cellular speakerphone
This invention includes a circuit for the prevention of acoustic feedback between an electronic device and an audio accessory. In a preferred embodiment, the circuit prevents audio feedback between...
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7024011 |
Hearing aid with an oscillation detector, and method for detecting feedback in a hearing aid
In a hearing aid having an oscillation detector and a method for establishing the presence of oscillations in a hearing aid, sinusoidal input signals of the microphone can be detected, and so...
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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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7010129 |
Method and device for operating voice-controlled systems in motor vehicles
A device for operating voice-controlled systems, such as communication and/or intercommunication systems in motor vehicles, includes a plurality of microphones and at least one loudspeaker. Voice...
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6999594 |
Method and apparatus for reduction of unwanted feedback
An RF active deflector is described for use with orthogonal frequency division multiplex signals. An input antenna receives an RF input signal and an output antenna transmits an RF signal on...
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6980663 |
Process and device for compensating for signal loss
For an especially low loss and echo free communication between several participants in a room ( 1 ) an inventive process for the compensation of losses of a signal(S) along a transmission path...
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6931123 |
Echo cancellation
An audio conferencing system in which each participant in the conference generates a monaural signal for transmission on an output channel to the other participants, and receives a plurality of...
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6895093 |
Acoustic echo-cancellation system
A multi-channel acoustic cancellation system 40 with, for example, stereo speakers and a pair of microphones in the transmitting and receiving rooms ( 11 and 21 ) has time varying all-pass...
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6885338 |
Adaptive digital beamformer coefficient processor for satellite signal interference reduction
Filter coefficients of a beamformer are computed based on a segment of input samples. The segment of input samples is divided into a plurality of blocks of input samples wherein the plurality of...
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6810124 |
Adaptive resonance canceller apparatus
An adaptive resonance canceller system and method for attenuating narrowband noise signals within an input signal, where the narrowband noise signals may vary significantly in frequency. The sensor...
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6683961 |
Process and apparatus for eliminating loudspeaker interference from microphone signals
Filter system designed to remove loudspeaker-generated sound signals from a microphone signal, comprising a stereo sampling unit for sampling the interference-bearing microphone signal as well as...
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6674863 |
Microphone-speaker apparatus
Herein disclosed is a microphone-speaker apparatus, comprising: audio signal dividing means for dividing the audio signal into a plurality of raw component signals each indicative of the raw wave...
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6674451 |
Preventing audio feedback
A method for enabling a user to proactively reduce the likelihood of audio feedback in an application requiring audio input and output, comprising the steps of: generating a graphical user...
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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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6665411 |
DVE system with instability detection
A digital voice enhancement, DVE, communication system includes an instability detector detecting an unstable acoustic feedback condition from a loudspeaker to a microphone by sensing a condition...
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6625286 |
Precise amplitude correction circuit
Amplitude is corrected by subtracting a component signal from a composite signal to produce a remainder signal, correlating the remainder signal with the component signal to produce a product...
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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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6608898 |
Band pass and notch filters for echo reduction with less phase distortion
A complementary comb filter includes a plurality of band pass filters and a plurality of notch filters, wherein the notch filters have the same center frequencies as the band pass filters or the...
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6590974 |
Howling controller
A digital signal processing algorithm to cancel howling in a telephone circuit, the telephone circuit being characterized by a receive path and a transmit path in an effective closed loop...
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6535609 |
Cabin communication system
The present invention teaches a system for improving the clarity of a voice spoken within an enclosed space. The system comprises a first microphone, positioned at a first location, for receiving...
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6535111 |
Wave-discriminating inductive electronic device
A wave-discriminating inductive electronic device includes a special integrated circuit that is inducible by a proximity feeble electromagnetic signal generated by a general mobile phone during...
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6466674 |
Method and apparatus for eliminating audio feedback
The present invention is embodied in a method and apparatus for eliminating audio feedback which includes an active microphone coupled to an amplifier which transmits signals received at the active...
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