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| Number | Title | Issue Date |
| 8150054 | Adaptive filter in a sensor array system Disclosed is a steerable sensor array that receives input from a target and applies an averaging filter. An adaptive filter is then used if the SNR of the output of the averaging filter reaches a threshold. ... | 04/03/2012 |
| 8144888 | Filter apparatus for actively reducing noise A filter apparatus for reducing noise from a primary noise source, comprising a secondary source signal connector for generating secondary noise to reduce said primary noise and a sensor connector for connecting to a sensor for measuring said primary and secondary n... | 03/27/2012 |
| 8116473 | 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 dif... | 02/14/2012 |
| 8073149 | Loudspeaker device The loudspeaker device according to the present invention comprises a loudspeaker; a feedforward processing section for performing feedforward processing on an electric signal to be inputted to the loudspeaker based on a preset filter coefficient so that non-linear ... | 12/06/2011 |
| 7933420 | Methods and systems for determining the effectiveness of active noise cancellation A method for controlling a noise cancellation system having an adaptive control portion is provided. The noise cancellation system is operable to generate a cancellation noise configured to at least partially cancel an unwanted noise in a defined environment. The ad... | 04/26/2011 |
| 7903828 | Remote multipoint architecture for full-duplex audio A method, microphone module and a system for full-duplex audio system implementing full duplex audio, audio echo cancellation and audio codec. The audio signals from the microphones and to the loudspeakers are encoded to reduce the transmission bandwidth requirement... | 03/08/2011 |
| 7885417 | Active noise tuning system Active noise control system and method for controlling an acoustic noise generated by a noise source at a listening location, in which system and method sound is picked up in the surroundings of the listening location by a sound sensor; an electrical noise signal wh... | 02/08/2011 |
| 7720233 | Signal processing method and apparatus A signal processor includes: a first adaptive filter that takes a first signal as input and generates a first pseudo signal; a first subtractor that subtracts the first pseudo signal from a second signal to supply a first differential signal as output; a second adap... | 05/18/2010 |
| 7688984 | Active noise control method and apparatus including feedforward and feedback controllers An active noise control apparatus for reducing noise from a noise source includes a microphone for detecting noise produced by the noise source, and a generalized finite impulse response (FIR) filter for receiving noise signals of the detected noise from the microph... | 03/30/2010 |
| 7436968 | Adaptive noise reduction method and device An adaptive noise reduction method and apparatus capable of reducing efficiently variable period noise from a main input is provided. The pitch of a noise waveform to be reduced can be variable with a change in a period of motor noise occurring when the revolution p... | 10/14/2008 |
| 7386135 | Cardioid beam with a desired null based acoustic devices, systems and methods An acoustic device is provided with first and second one or more acoustic elements to generate a first signal that includes mostly undesired audio and substantially void of desired audio, and a second signal that includes desired as well undesired audio respectively... | 06/10/2008 |
| 7352869 | Apparatus for and method of actively controlling vibratory noise, and vehicle with active vibratory noise control apparatus The filter coefficients of an adaptive notch filter are sequentially updated to minimize an error signal based on the error signal and a first reference signal which is produced by subtracting a signal which represents the product of a sine corrective value C1 | 04/01/2008 |
| 7343016 | Linear independence method for noninvasive on-line system identification/secondary path modeling for filtered-X LMS-based active noise control systems A method for noninvasive on-line secondary path modeling for the filtered-X LMS algorithm actively controls periodic noise. The method, based in the frequency domain, uses the concept of linear independence of two equations/two unknowns to arrive at the secondary pa... | 03/11/2008 |
| 7340065 | Active noise control system An active noise control system is provided which cancels a noise using a sound radiated from a speaker driven by an output from an adaptive notch filter. The system employs output signals from an adder or simulation cosine-wave and sine-wave signals, an error signal... | 03/04/2008 |
| 7340064 | Active noise control system An active noise control system is provided which cancels a noise using a secondary noise from a speaker that is operated in accordance with an output from an adaptive controller. The system is configured such that microphone monitor interrupts a switch to thereby st... | 03/04/2008 |
| 7340063 | Feedback cancellation with low frequency input The invention relates to a method for canceling feedback in an acoustic system comprising a microphone, a signal path, a speaker and means for detecting presence of feedback between the speaker and the microphone, the method comprising providing a LMS algorithm for ... | 03/04/2008 |
| 7310425 | Multi-channel frequency-domain adaptive filter method and apparatus The invention is a method and apparatus for frequency-domain adaptive filtering that has broad applications such as to equalizers, but is particularly suitable for use in acoustic echo cancellation circuits for stereophonic and other multiple channel teleconferencin... | 12/18/2007 |
| 7302062 | Audio enhancement system An audio enhancement system for compensating for ambient noise in a listening environment, comprises an audio system that produces an electrical sound signal and generates a sound output from the electrical sound signal. A sensor (e.g., a microphone) senses a total ... | 11/27/2007 |
| 7277554 | Dynamic range compression using digital frequency warping A dynamic range compression system is provided, using either a sample-by-sample or a block processing system. Such a system can be used, for example, in a hearing aid. The system, using a frequency-warped processing system, is comprised of a cascade of all-pass filt... | 10/02/2007 |
| 7272234 | Multi-channel active control system and method for the reduction of tonal noise from an axial fan A multi-channel active noise control system and method of reducing tonal noise emanating from a tonal noise source are disclosed. The system may include an adaptive controller, a plurality of loudspeakers driven by the loudspeaker, one or more microphones for genera... | 09/18/2007 |
| 7254184 | Wireless communication using multi-transmit multi-receive antenna arrays A method of closed-loop multi-stream wireless communication between a transmitter (1) comprising a transmit antenna array of N transmit antenna elements and a receiver (3) comprising a receive antenna array (4) of M receive antenna elements, whe... | 08/07/2007 |
| 7248703 | Systems and methods for adaptive noise cancellation A system (400) for reducing non-acoustic noise includes a primary sensor (420), at least one secondary sensor (410), a filter (415), and a summation unit (425). The primary sensor (420) measures pressure and produces a prima... | 07/24/2007 |
| 7239660 | Adaptive filter with GSPT LMS algorithm for reducing complexity A linear/non-linear adaptive filter for transforming an input signal to an output signal. The present invention also includes a novel GSPT LMS algorithm for significantly reducing complexity. The adaptive filter includes a coefficient updater that can execute a Carr... | 07/03/2007 |
| 7224807 | System for computationally efficient active control of tonal sound or vibration A noise or vibration control system reduces a sampling rate and reduces a control rate to improve computation efficiency. The present invention permits the use of a sample frequency (fs) that is less than twice the frequency of interest (fd). T... | 05/29/2007 |
| 7197146 | 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 coefficients and modifies the adaptive coefficients based on a feedback o... | 03/27/2007 |
| 7197147 | Computationally efficient means for optimal control with control constraints A system and method reduces undesired noise or vibration in a vehicle. The ambient vibration is measured and command signals are generated over time. The command signals are generated based upon the measured vibration and based upon a control weighting. By varying t... | 03/27/2007 |
| 7171436 | Partitioned block frequency domain adaptive filter The partitioned block frequency domain adaptive filter according to the invention comprises a plurality of parallel arranged filter partitions. Each filter partition models a part of an impulse response of the adaptive filter and has update means for updating filter... | 01/30/2007 |
| 7161635 | Video signal processing A method of de-interlacing a video signal by conducting three linear filtering operations on the input to produce three filtered signals, each linear filtering operation comprising the taking of a weighted sum of pixels; and multiplying together the three filtered s... | 01/09/2007 |
| 7162420 | System and method for noise reduction having first and second adaptive filters An apparatus and method for noise reduction employ a first processor having one or more channels, each channel comprising a respective first processor filter, and each channel configured to receive a respective one of one or more input signals. The first processor i... | 01/09/2007 |
| 7158566 | High-speed adaptive interconnect architecture with nonlinear error functions A low cost and high speed equalizing receiver structure is provided for improved inter-chip and inter-module communications. The receiver is able to recover data from a corrupted waveform from a signal wire such as one found on data, address or control wires in a mi... | 01/02/2007 |
| 7155019 | Adaptive microphone matching in multi-microphone directional system Improved approaches to matching sensitivities of microphones in multi-microphone directional processing systems. These approaches operate to adaptively match microphone sensitivities so that directional noise suppression is robust. As a result, microphone sensitivit... | 12/26/2006 |
| 7155018 | System and method facilitating acoustic echo cancellation convergence detection A system and method facilitating acoustic echo cancellation convergence detection is provided. The invention includes an acoustic echo cancellation convergence detector having a center clipping component, a convergence calculator, a convergence filter and a converge... | 12/26/2006 |
| 7149320 | Binaural adaptive hearing aid A system and method for processing an acoustic input signal and providing at least one output acoustic signal to a user of a hearing-aid system. The hearing-aid system includes first and second channels with one of the channels having an adaptive delay. The first ch... | 12/12/2006 |
| 7139400 | Microphone calibration for active noise control system An active noise control system (100) and method compensates for changes in a microphone output to maintain accurate noise control. A calibration signal reflecting a desired microphone output is generated and stored in an active noise control module (106 | 11/21/2006 |
| 7126504 | Methods and systems for filtering unwanted noise in a material metering machine Methods and systems for filtering an analog signal sampled at a very high frequency and outputting a digital signal that has a very low sampling frequency to drive a material metering machine. The high frequency digital input signal is input to a first decimation el... | 10/24/2006 |
| 7120259 | Adaptive estimation and compensation of clock drift in acoustic echo cancellers A system and method for adaptive estimation and compensation of clock drift in echo cancellers is provided. The invention includes an acoustic echo cancellation system with a built in adaptive clock drift compensation system. The acoustic echo cancellation system ha... | 10/10/2006 |
| 7117128 | Method and apparatus for digital signal filtering A Q-Filter is a reconfigurable technique that performs a continuum of linear and nonlinear filtering operations. It is modeled by unique mathematical structure, utilizing a function called the Q-Measure, defined using a set of adjustable kernel parameters to enable ... | 10/03/2006 |
| 7110551 | Adaptive personal active noise reduction system An improved active noise reduction system which has a transducer, an electro-acoustic sensing means including adjacent to the transducer, an attenuation means with electro-acoustic sensing means to attenuate selected sound frequencies, said system utilizing both fee... | 09/19/2006 |
| 7107127 | Computationally efficient means for optimal control with control constraints A method and system that reduces undesired vibration in a vehicle measures ambient vibration and generates a first command signal based upon the measured vibration. If a first component of the first command signal exceeds a maximum allowable, the first component of ... | 09/12/2006 |
| 7106866 | Active noise cancellation stability solution The method of noise attenuation comprises the steps of generating a noise canceling signal, sensing for an system condition, and ceasing the generation of the noise canceling based upon the system condition. This method is embodied in a system that includes an air i... | 09/12/2006 |
