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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...
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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...
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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...
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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 (M 1 , M 2 ) are spaced a certain distance apart, the output signals (MS 1 ,...
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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...
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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 )...
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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...
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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...
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7127072 |
Method and apparatus for reducing random, continuous non-stationary noise in audio signals
There are provided a method and an apparatus for reducing random, continuous, non-stationary noise in audio signals, the noisy audio signal being filtered by means of a predetermined filter...
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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...
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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...
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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...
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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...
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6959092 |
Noise reduction panel arrangement and method of calibrating such a panel arrangement
Noise reduction arrangement including: a plurality of actuators ( 3 ( n )) for generating secondary noise (p s ) to reduce primary noise (p p ) and being located in a first surface; a plurality of...
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6891776 |
Vibrator sweep shaping method
This invention relates to improved methods to generate shaped sweeps, and for the acquisition of vibroseis data with a shaped pilot sweep.
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6847721 |
Active noise control system with on-line secondary path modeling
An active noise control system is provided to specify an input transducer, an error transducer, an output transducer and an active noise controller for generating an anti-phase canceling acoustic...
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6832973 |
System for active noise reduction
An apparatus and method to minimize acoustic vibration in a vehicle due to impulsive gear clash loads. Sensors are mounted on the vehicle and are used to sense vehicle vibration generated by the...
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6831983 |
Method for controlling an active control system and system using such method
Method for controlling a control arrangement controlling a predetermined system ( 10 ), the control arrangement comprising a controller ( 6 ), M output sensors ( 4 ) providing an output signal...
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6804359 |
Signal processor for reducing undesirable signal content
A signal processor for reducing undesirable signal content reduces the undesirable signal content by exaggerating the undesirable signal content and then using this exaggerated undesirable signal...
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6751325 |
Hearing aid and method for processing microphone signals in a hearing aid
In a hearing aid and a method for processing microphone signals in a hearing aid, a signal processing unit is provided in order to amplify and/or attenuate signal parts of at least two microphone...
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6744886 |
Adaptive filter utilizing proportional affine projection algorithm
An adaptive filter suitable for network echo cancellation and other applications contains a coefficient vector update device for feeding coefficient vector updates to a finite impulse response...
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6738481 |
Noise reduction apparatus and method
A method and noise reduction apparatus comprises a microphone array including a plurality of microphone elements for receiving a training signal including a plurality of training signal samples,...
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6728380 |
Adaptive noise suppression system and method
A system and method for suppressing cyclic noise components of a sampled sensor signal generates an error compensation signal that is subtracted from the sampled sensor signal to produce a...
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6724899 |
Sound pick-up and reproduction system for reducing an echo resulting from acoustic coupling between a sound pick-up and a sound reproduction device
A sound pick-up and reproduction system includes at least two sound sensors, such as microphones, situated at different distances from a sound reproduction device, such as a loudspeaker. A...
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6675125 |
Statistics generator system and method
A method and system for monitoring, maintaining and analyzing statistical performance information in a signal processing system includes collecting data representing a plurality of aspects of the...
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6668062 |
FFT-based technique for adaptive directionality of dual microphones
The present invention comprises an adaptive directionality dual microphone system in which the time domain data from the first and second microphones is converted into frequency domain data. The...
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6650757 |
Method and system to detect unwanted noise
An apparatus for detecting unwanted noise includes a reference sensor that generates a reference signal in response to stimulation by a source. A combined noise detector picks up a combined noise...
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6650756 |
Method and apparatus for characterizing audio transmitting system, and method and apparatus for setting characteristics of audio filter
A designing system for adaptively characterizing an audio transmitting system has a white noise generating unit for generating a white noise signal. A speaker radiates the white noise generated by...
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6487295 |
Adaptive filtering system and method
A signal filter includes a first adaptive filter receiving a desired signal containing a noise component and a first noise correlated reference signal, and outputting a first filtered output...
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6449369 |
Method and device for hybrid active attenuation of vibration, particularly of mechanical, acoustic or similar vibration
A filtering device consisting of a nonadaptive feedback filter that generates active attenuation of the vibration on the framework, without generating instability in a first frequency band, and an...
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6292571 |
Hearing aid digital filter
A digital hearing aid uses a digital filter using coefficient multipliers and with digital signal processing algorithms, which can be implemented with a minimum amount of dedicated circuitry, which...
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6229898 |
Active vibration control system using on-line system identification with enhanced noise reduction
A system for enhancing vibration reduction in a vehicle that utilizes one or more sensors which sense ambient vibration in the vehicle and generate a signal corresponding to the sensed vibrations....
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6208739 |
Noise and vibration suppression method and system
A method and system for attenuating the effects of unknown, unmeasurable and time-varying exogenous disturbances on multiple-input multiple-output dynamical systems are described. The disturbance...
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6154547 |
Adaptive noise reduction filter with continuously variable sliding bandwidth
An infinite impulse response (IIR) lowpass filter is placed in the audio path of an audio system wherein the upper cutoff frequency of the filter is adaptively controlled based on a comparison...
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6094623 |
Non-linear digital adaptive compensation in non-ideal noise environments
An adaptive system applicable to non-ideal measurement operations wherein the reference signal includes information attempting to be extracted from the primary signal and wherein digital non-linear...
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6055318 |
Adaptive noise reduction filter with low modulation disabling
An infinite impulse response (IIR) lowpass filter is placed in the audio path of an audio system wherein the upper cutoff frequency of the filter is adaptively controlled based on a comparison...
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6018689 |
Active vibration reducing apparatus and method for identifying transfer function in active vibration reducing apparatus
Described are a vibration actively reducing apparatus and a method for identifying a transfer function in the vibration actively reducing apparatus. An identification signal which is a quantization...
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6002778 |
Active structural control system and method including active vibration absorbers (AVAS)
An Active Structural Control (ASC) system (10) and method which includes a plurality of Active Vibration Absorbers (AVAs) (40) attached to a yoke (32) included within a pylon structure (28)...
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5987144 |
Personal active noise cancellation method and device having invariant impulse response
A selected electrical signal is first applied to the input of a source (30) to determine at least the impulse response (H), over a predetermined time, between the source output and the input of...
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5978489 |
Multi-actuator system for active sound and vibration cancellation
A multi-actuator system for active sound and vibration cancellation utilizes an LMS type algorithm having an adaptive filter. However, the error signal rather than the input is filtered through an...
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5963651 |
Adaptive acoustic attenuation system having distributed processing and shared state nodal architecture
An adaptive acoustic attenuation system has distributed nodal processing and a shared state nodal architecture. The system includes a plurality of adaptive filter nodes, each preferably having a...
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5937070 |
Noise cancelling systems
A first major aspect of the invention relates to an active noise cancelling system which detects ambient noise and applies electro-accoustic processing thereto to produce an acoustic signal for...
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5912923 |
System for transmitting coded speech signals
Complex coding of speech signals, as this is used, for example, in the GSM half rate speech coder, requires the use of a signal processor. On the other hand, a hands-free facility requires an...
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5910993 |
Apparatus and method for actively reducing vibration and/or noise
In apparatus and method for actively reducing a periodic vibration and/or noise, a divergence determinator is provided in which a presence or absence of a higher order divergence of a control of...
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5834647 |
Active device for attenuating the sound intensity
A device for attenuating noises generated by moving sources includes a set of arranged electroacoustic sources which emit an opposite antinoise wave in response to an incident wave as sensed and...
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5828760 |
Non-linear reduced-phase filters for active noise control
An active noise (or vibration) control system having an actuator 24 which provides an acoustic anti-noise signal in response to an drive signal (U), an error sensor 16 which senses the acoustic...
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5812682 |
Active vibration control system with multiple inputs
An active vibration control system having at least two input sensors generating first signals representative of a primary vibration field, a plurality of actuators driven by second signals and...
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5796849 |
Active noise and vibration control system accounting for time varying plant, using residual signal to create probe signal
An active noise and vibration control system is constructed such that the residual signal from the residual sensor is fed back into the controller and used to generate the probe signal....
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5784300 |
Methods, apparatus and systems for real time identification and control modes of oscillation
A system for real time identification of modes of oscillation includes a sensor, an observer, a controller and an actuator. The sensor senses a controlled system such as a combustor, and generates...
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5745581 |
Tracking filter for periodic signals
A method for designing a frequency periodic filter with a frequency response which has a periodic bandwidth including designing a first sampled data filter whose response corresponds to a set...
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