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8184819 |
Microphone array signal enhancement
A system and method facilitating signal enhancement utilizing an adaptive filter is provided. The invention includes an adaptive filter that filters an input based upon a plurality of adaptive...
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8180068 |
Noise eliminating apparatus
A noise eliminating apparatus includes a first microphone, a second microphone and a signal processing unit, the signal processing unit includes a linear prediction filter and a noise resynthesis...
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8175290 |
Feedback reduction system
A feedback reduction system adaptively processes a microphone signal. An adaptive feedback suppression filter circuit processes the microphone signal, and an adaptive feedback compensation filter...
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8170256 |
Microphone assembly for minimizing acoustic feedback from a loudspeaker
A microphone assembly for desktop communication systems utilizes a directional microphones in a desktop conferencing system without exposing the microphone to unfavorable mechanical or acoustic...
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8160271 |
Variable noise masking during periods of substantial silence
Methods and systems for masking audio noise are disclosed. One apparatus includes a silence detector configured to detect a period of substantial silence in an audio signal; a masking noise source...
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8155302 |
Acoustic echo canceller
An acoustic echo cancellation device for canceling an echo in a microphone signal in response to first and second input signals includes a first combination unit for combining the first and second...
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8144895 |
Howling control apparatus and acoustic apparatus
It is an object of the present invention to provide a howling suppressing apparatus and an acoustic apparatus which can suppress the howling component effectively without suppressing a periodic...
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8130992 |
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...
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8130969 |
Multi-channel echo compensation system
An echo compensation system may remove undesirable audio signals. The echo compensation system may utilize adaptive filters to remove echoes and undesirable signals received by a microphone. The...
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8130988 |
Method and apparatus for reproducing audio signal
An audio signal is supplied to a loudspeaker array to perform wavefront synthesis. A virtual sound source is produced at an infinite distance using wavefront synthesis. A propagation direction of a...
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8126158 |
Reducing sound pressure of noise
A system comprising converter logic that introduces noise to a signal. The system also comprises amplifier logic that reduces a sound pressure associated with the noise by amplifying the signal...
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8121311 |
Mixer with adaptive post-filtering
A noise reduction system includes multiple transducers that generate time domain signals. A transforming device transforms the time domain signals into frequency domain signals. A signal mixing...
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8116490 |
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...
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8111840 |
Echo reduction system
A system for reducing an echo and/or a residual echo in a microphone output signal includes an echo compensation filter configured to receive audio input signals and generate an estimated echo...
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8103019 |
Probabilistic gain-sensing ringing feedback detector
Disclosed herein are detectors of audio ringing feedback, that is decaying feedback with a gain of less than one, those detectors utilizing a repeated gain measurement that applied to a range of...
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8103007 |
System and method of detecting speech intelligibility of audio announcement systems in noisy and reverberant spaces
A system and method to detect and remediate unacceptable levels of speech intelligibility evaluates received test audio transmitted across and received in a space or region of interest....
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8098848 |
System for equalizing an acoustic signal
An equalization system enhances the quality of communications between a remote party and a local party. The equalization system includes an equalization filter that equalizes an acoustic signal...
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8098833 |
System and method for dynamic modification of speech intelligibility scoring
A system and method to detect and measure remediated speech intelligibility by evaluating received test audio transmitted across and received in a space or region of interest. Remediation of the...
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8098841 |
Sound field controlling apparatus
A sound field controlling apparatus for a public-address system comprises a microphone that picks up a sound of a speaker, a loudspeaker that sound a sound signal based on the sound picked up by...
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8090118 |
Strength discriminating probabilistic ringing feedback detector
Disclosed herein are detectors of audio ringing feedback, that is decaying feedback with a gain of less than one, those detectors utilizing a repeated gain measurement that applied to a range of...
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8085947 |
Multi-channel echo compensation system
A system reduces echoes in an audio system by de-correlating audio signals. Adaptive filters provide compensation based on the de-correlated signals. A controller controls the de-correlation based...
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8085945 |
Communication machine room wideband noise suppression system
In a communication machine room wideband noise suppression system, a sensing unit detects a noise source produced by a fan during the operation thereof and generates a noise input signal and a...
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8081776 |
Indoor communication system for a vehicular cabin
A system automatically determines an equalizing filter characteristic for a communication system within a vehicle. The communication system includes a loudspeaker and a microphone or microphone...
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8068629 |
Hearing aid and method of utilizing gain limitation in a hearing aid
A hearing aid (200) with multiple microphones comprises a first microphone (1) for converting sound into a first audio signal, a second microphone (20) for converting sound into a second audio...
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8054992 |
High frequency compensating
A method and apparatus for increasing phase margin in a feedback circuit of an active noise reduction headphone. The method includes providing an acoustic block comprising an acoustic driver...
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8045738 |
System for managing feedback
Feedback detection, adaptive notch filtering, and gain adjustment are combined for managing feedback. Feedback detection includes detection of short term and long term spectral peaks and assessing...
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8045730 |
Methods and systems for reducing acoustic echoes in communication systems
Various embodiments of the present invention are directed to methods and systems that reduce acoustic echoes in audio signals in accordance with changing conditions at first and second locations...
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8041055 |
Method and apparatus for automatically adjusting reminder volume on a mobile communication device
A method and apparatus for automatically adjusting volume of an audio signal on a mobile device, comprising playing the audio signal at an initial volume, sampling the audio signal, estimating a...
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8036398 |
Circuit and apparatus having a delay unit for reducing periodic noise
A signal processing circuit includes a delaying unit that is configured to carry out delay processing on the basis of periodicity information synchronized with the periodicity of a periodic noise...
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8036389 |
Apparatus and method of canceling vocal component in an audio signal
An apparatus and method of canceling a vocal component includes a first vocal canceling unit to delay each of the left and right channel input signals for a predetermined time and to feed-forward...
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8031881 |
Method and apparatus for microphone matching for wearable directional hearing device using wearer's own voice
Method and apparatus for microphone matching for wearable directional hearing assistance devices are provided. An embodiment includes a method for matching at least a first microphone to a second...
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8027486 |
Probabilistic ringing feedback detector with frequency identification enhancement
Disclosed herein are detectors of audio ringing feedback, that is decaying feedback with a gain of less than one, those detectors utilizing a repeated gain measurement that applied to a range of...
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7965854 |
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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7965853 |
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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7945066 |
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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7945057 |
Procedure and device for linearizing the characteristic curve of a vibration signal transducer such as a microphone
A procedure and device for linearizing the characteristic curve of a vibration signal transducer such as a microphone that includes collecting signals, transmitting the signals, extracting...
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7925031 |
Audio system with feedback detection means
The invention concerns an audio system comprising a microphone, audio signal processing means, an output transducer and mans for detecting a possible feedback tone and the corresponding frequency...
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7912230 |
Howling detection device and method
A howling detection device detects a dominance ratio, which indicates a risk of howling to occur when a mixed signal obtained by mixing a plurality of sound signals collected by a plurality of...
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7912228 |
Device and method for operating voice-supported systems in motor vehicles
In a method and equipment for operating a voice-supported system, such as a communications and/or intercom/two-way intercom device in a motor vehicle, using at least one microphone and at least one...
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7855726 |
Apparatus and method for presenting audio in a video teleconference
An advanced video teleconferencing (AVTC) system uniquely combines a number of features to promote a realistic “same room” experience for meeting participants. These features include an aut...
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7844063 |
Hearing and apparatus with compensation of acoustic and electromagnetic feedback signals
Hearing aids with microphone and telephone coil are to be made simpler and more convenient. For this purpose it is provided to use an adaptive filter to compensate acoustic and electromagnetic...
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7840014 |
Sound apparatus with howling prevention function
An acoustic system that eliminates the howling that occurs when the sound outputted by the speaker feeds back to the input device. The acoustic system comprises a digital signal processor (DSP)...
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7813923 |
Calibration based beamforming, non-linear adaptive filtering, and multi-sensor headset
A first set of signals from an array of one or more microphones, and a second signal from a reference microphone are used to calibrate a set of filter parameters such that the filter parameters...
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7813499 |
System and process for regression-based residual acoustic echo suppression
A regression-based residual echo suppression (RES) system and process for suppressing the portion of the microphone signal corresponding to a playback of a speaker audio signal that was not...
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7809150 |
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...
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7796767 |
Howling detection method, device, and acoustic device using the same
A howling detector is provided which can discriminate between howling and a signal having a strong narrow-band component, thereby detecting howling with higher accuracy. The howling analyzer...
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7778425 |
Method for generating noise references for generalized sidelobe canceling
This invention describes a method for generating noise references for adaptive interference cancellation filters for applications in generalized sidelobe canceling systems. More specifically the...
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7778426 |
Feedback suppression in sound signal processing using frequency translation
A method of processing a sound signal in an audio amplification device using frequency transposition, the method including the steps of: (a) receiving (11) an input sound signal, (b) determining...
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7773742 |
Echo canceller
There is provided an echo canceller which can appropriately cancel an echo even when a low-frequency component is included in the signal to be passed. The echo canceller includes an echo replica...
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7764634 |
Suppression of acoustic feedback in voice communications
Suppressing one or more frequency ranges of a signal prevents the occurrence of feedback in a voice data communications application. A system recognizes a frequency range in a signal where feedback...
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