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| Number | Title | Issue Date |
| 8160264 | Transfer function estimating device, noise suppressing apparatus and transfer function estimating method A transfer function estimating device for estimating a transfer function of a sound, includes: a sound receiving module receiving a sound from a given sound source and converting the sound into a tone signal; a storage module storing first transfer functions of the ... | 04/17/2012 |
| 8116474 | System for suppressing ambient noise in a hands-free device In order to suppress as much noise as possible in a hands-free device in a motor vehicle, for example, two microphones (M1, M2) are spaced a certain distance apart, the output signals (MS1, MS2) of which are added in an adder (AD) and sub... | 02/14/2012 |
| 7804963 | Method and device for comparing signals to control transducers and transducer control system A method of comparison between pieces of information characterizing reference values and pieces of information characterizing current values of sound-reproducing systems of a system of (n) microphones mi and (p) speakers hpj for the control of ... | 09/28/2010 |
| 7680285 | 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... | 03/16/2010 |
| 7574006 | Active noise controller An active noise controller can determine the signal transmission characteristics from the power amplifier and the speaker to the microphone without using any special external measuring instrument and calculate a cosine correction value and a sine correction value wi... | 08/11/2009 |
| 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 |
| 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 |
| RE40054 | Video-assisted audio signal processing system and method A circuit arrangement for controlling audio signal transmissions for a communications system that includes a microphone and a video camera. The arrangement comprises a video processor configured and arranged to receive a video signal from the video camera, detect mo... | 02/12/2008 |
| 7319954 | Multi-channel codebook dependent compensation Methods and apparatus, in the context of speech recognition, for compensating in the cepstral domain for the effect of an interfering signal by using a reference signal. ... | 01/15/2008 |
| 7315623 | Method for supressing surrounding noise in a hands-free device and hands-free device In order to suppress as much noise as possible in a hands-free device in a motor vehicle, for example, two microphones (M1, M2) are spaced a certain distance apart, the output signals (MS1, MS2) of which are added in an adder (AD) and sub... | 01/01/2008 |
| 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 |
| 7305094 | System and method for actively damping boom noise in a vibro-acoustic enclosure A system and method for actively damping boom noise within an enclosure such as an automobile cabin. The system comprises an acoustic wave sensor, a motion sensor, an acoustic wave actuator, a first electronic feedback loop, and a second electronic feedback loop. Th... | 12/04/2007 |
| 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 |
| 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 |
| 7231052 | Vibration-isolating and sound isolating system for vehicle An engine is supported on a vehicle body frame through an active vibration-isolating device. The vibration of the engine is prevented from being transmitted to the vehicle body frame by controlling the active vibration-isolating device. A speaker is disposed within ... | 06/12/2007 |
| 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 |
| 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 |
| 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 |
| 7181296 | Method of adaptive interactive learning control and a lithographic manufacturing process and apparatus employing such a method By applying time-frequency analysis to a given standard iterative learning control or ILC an adaptive filter for the learned feed-forward loop is designed. This time varying filter varies according to the momentary frequency content of the error signal and allows to... | 02/20/2007 |
| 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 |
| 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 |
| 7117145 | Adaptive filter for speech enhancement in a noisy environment A cabin communication system for improving clarity of a voice spoken within an interior cabin having ambient noise includes a microphone for receiving the spoken voice and the ambient noise and for converting the spoken voice and the ambient noise into an audio sign... | 10/03/2006 |
| 7110554 | Sub-band adaptive signal processing in an oversampled filterbank An adaptive signal processing system for improving a quality of a signal. The system includes an analysis filterbank for transforming a primary information signal in time domain into oversampled sub-band primary signals in frequency domain and an analysis filterbank... | 09/19/2006 |
| 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 |
| 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 method including providing an LMS algorithm for processing the signal; whe... | 09/12/2006 |
| 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 |
| 7101337 | Method and non-invasive device for focusing acoustic waves The invention concerns a method for focusing acoustic waves useful for obtaining an image of a field to be observed in a dissipative heterogeneous medium (2, 3) around which acoustic transducers (T1–Tn, T′1–T′m) forming an imaging networ... | 09/05/2006 |
| 7103623 | Partitioned block frequency domain adaptive filter The partitioned block frequency domain adaptive filter according to the invention includes a plurality of parallel arranged filter partitions. Each filter partition models a part of an impulse response of the adaptive filter and has update unit for updating filter c... | 09/05/2006 |
| 7088828 | Methods and apparatus for providing privacy for a user of an audio electronic device The invention is directed to techniques for suppressing the voice of a user of an audio electronic device, such as a mobile phone, from being heard by an unintended listener. In one arrangement, the invention includes an input microphone, an electronics module, and ... | 08/08/2006 |
| 7072480 | Hearing aid system with a hearing aid and an external processor unit A hearing aid system has a hearing aid and an external processor unit, where the external processor unit is permanently allocated to a specific hearing environment. The external processor unit is fashioned for remaining in the respective hearing environment long-ter... | 07/04/2006 |
| 7068736 | Methods and devices for shortening the convergence time of blind, adaptive equalizers The convergence time of a blind, adaptive equalizer is shortened by using a tracking generator. The tracking generator comprises a smoothing filter which receives and smoothes a tap coefficient error estimate derived from an output data stream. Thereafter, a fractio... | 06/27/2006 |
| 7050864 | Control system for a plant using identified model parameters A control system for a plant is provided. This control system can control the plant more stably, when the model parameters of the controlled object model which are obtained by modeling the plant, which is a controlled object, are identified and the sliding mode cont... | 05/23/2006 |
| 7031461 | Robust adaptive filter for echo cancellation An adaptive filter is programmed with an algorithm based on a normalized Least Mean Squares (nLMS) algorithm that adapts each sample time. The algorithm is modified to be more efficient in a variety of DSPs by computing multiple errors, one per sample, before updati... | 04/18/2006 |
| 7020288 | Noise reduction apparatus An active noise control system includes a source unit for generating regenerative signals, an ANC unit for processing signals so as to actively cancel noise, sensors for detecting the information on the inside and outside of a vehicle, a vehicle interior voice discr... | 03/28/2006 |
| 7013832 | Arrangement for damping of structural resonance A hull (11) has mounted thereon a number of accelerometers (20) arranged to provide a data signal corresponding to movement or vibration of the hull (11) to which each is fixed. The hull (11) and/or a thrust block (18) has mounted ... | 03/21/2006 |
| 7013187 | Control procedure using a fuzzy logic model of at least one inverse transfer function of a dynamic system A control procedure is provided for use during a regulation stage and according to a set point of a physical dynamic system, the set point being subject to, whilst operating, the influence of several physical quantities represented by input parameters, and adopting ... | 03/14/2006 |
| 6996241 | Tuned feedforward LMS filter with feedback control A method to automatically and adaptively tune a leaky, normalized least-mean-square (LNLMS) algorithm so as to maximize the stability and noise reduction performance in feedforward adaptive noise cancellation systems. The automatic tuning method provides for time-va... | 02/07/2006 |
| 6978028 | Process and device for focusing acoustic waves After emission of an acoustic pulse, having a first duration, from a given location, acoustic signals coming from the location are gathered through a multi-scattering medium on an array of transducers and recorded, for a second duration greater by at least one order... | 12/20/2005 |
