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| Number | Title | Issue Date |
| 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 circuit further processes the microphone signal. The adaptive feedback... | 05/08/2012 |
| 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 component other than the howling component. The howling control apparatu... | 03/27/2012 |
| 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 prior to providing the signal to the converter logic and de-amplifying t... | 02/28/2012 |
| 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 device mixes the frequency domain signals according to a mixing ratio. F... | 02/21/2012 |
| 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 signal. A speech activity detector is configured to detect speech of a lo... | 02/07/2012 |
| 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 gain values characteristic of ringing-type feedback. Those gain measure... | 01/24/2012 |
| 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 gain values characteristic of ringing-type feedback. Those gain measure... | 01/03/2012 |
| 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 upon the adaptation state of the adaptive filters. ... | 12/27/2011 |
| 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 comprising a voice coil mechanically coupled along an attachment line to an... | 11/08/2011 |
| 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 that are linked together in a communication system. In one embodiment o... | 10/25/2011 |
| 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 gain values characteristic of ringing-type feedback. Those gain measure... | 09/27/2011 |
| 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 information from the signals, dephasing such information by 180 degrees compa... | 05/17/2011 |
| 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 of the feedback tone in the audio system between the output transducer... | 04/12/2011 |
| 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 microphones is outputted by a speaker. The howling detection device detec... | 03/22/2011 |
| 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 includes a frequency analyzing section for analyzing a frequency of a time ... | 09/14/2010 |
| 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 (19) gains for amplifying the input sound signal at a plu... | 08/17/2010 |
| 7742608 | Feedback elimination method and apparatus A method and apparatus for detecting a singing frequency in a signal processing system using two neural-networks is disclosed. The first one (a hit neural network) monitors the maximum spectral peak FFT bin as it changes with time. The second one (change neural netw... | 06/22/2010 |
| 7664275 | Acoustic feedback cancellation system A system for canceling acoustic feedback includes an input for receiving a digital audio signal and a processor configured to detect acoustic feedback signal in the digital audio signal and to determine the frequency of the feedback signal The system also includes a... | 02/16/2010 |
| 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 signal or a modified microphone signal, preferably by using a psychoacoust... | 12/01/2009 |
| 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 between frequency sample points to obtain a more accurate identificatio... | 10/13/2009 |
| 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 audio signal voltage and develops a monitor voltage. An indication circu... | 06/02/2009 |
| 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 is an integer greater than or equal to 2), and generates a sum signal ... | 10/28/2008 |
| 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 audio signals of the microphone array in such a way as to make the micr... | 08/19/2008 |
| 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 with a method of normalizing the relative levels of the different tal... | 06/24/2008 |
| 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, and delay rules module for programmable adaptive filtering. The hear... | 06/10/2008 |
| 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 angle at which the acoustical signals impinge on the input converter. Th... | 01/29/2008 |
| 7321845 | Method and system for removing very low frequency noise from a time-based data set A method and system are disclosed for removing very low frequency noise from a time-based data set for use in data analysis of the time-based data set having a plurality of data points, the method comprising providing the time-based data set to be analyzed, determin... | 01/22/2008 |
| 7313181 | Calibration of scale factor in adaptive equalizers An adaptive equalizer finite impulse response (FIR) filter for high-speed communication channels with modest complexity, where the filter is iteratively updated during a training sequence by a circuit performing the update: h(t+1)= h(t)+μ[sgn{... | 12/25/2007 |
| 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 taken to suppress the oscillation. The method involves using an FFT de... | 11/27/2007 |
| 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 unstable frequencies. By limiting the bandwidth of the feedback cancellati... | 11/06/2007 |
| 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 Frequency (RF) unit (102), demodulating t... | 10/09/2007 |
| 7263184 | Method and apparatus for active reduction of speakerphone singing In a speakerphone device identification of signals (i.e., voice input or speaker output) in a process for reducing acoustic feedback, in a communication device, is accomplished by adding a signature noise (i.e., an identification mark) to output signals radiated by ... | 08/28/2007 |
| 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 directional system in accordance with a dominant noise source. ... | 07/10/2007 |
| 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 digital feedback reducer (DFR) system that comprises a plurality of cha... | 06/05/2007 |
| 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 compensation path, a first filter device acts to compensate acoustic feedback, a... | 04/10/2007 |
| 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 signal corresponding to a feedback signal, where the frequency interpolat... | 04/10/2007 |
| 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 repetition of howling suppression and cancellation. A howling detecting sec... | 03/13/2007 |
| 7170404 | Acoustic alert communication system with enhanced signal to noise capabilities System, device and method for alerting an individual to an alert condition using acoustic alarms having less sensitivity to multipath distortion and having improved inherent signal to noise ratio properties, wherein the acoustic alarms are readily distinguishable us... | 01/30/2007 |
| 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 level of the signal may be determined using an audibility model so as... | 01/09/2007 |
| 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 thereof, the method comprising: producing by means of a filter an equ... | 12/26/2006 |
