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| Number | Title | Issue Date |
| 8170229 | Audio privacy apparatus and method Apparatus and Method for canceling or reducing voice sounds produced during a conversation by the user of a cellular telephone or other communication device such that other persons close to the user cannot hear the users voice and is not disturbed by the conversatio... | 05/01/2012 |
| 8155334 | Feedforward-based ANR talk-through An ANR circuit, possibly of a personal ANR device, reduces the degree of feedforward-based ANR that it provides in response to receiving an indication of the operation of a manually-operable control. The reduction of degree of feedforward-based ANR may be effected b... | 04/10/2012 |
| 8019091 | Voice activity detector (VAD) -based multiple-microphone acoustic noise suppression Acoustic noise suppression is provided in multiple-microphone systems using Voice Activity Detectors (VAD). A host system receives acoustic signals via multiple microphones. The system also receives information on the vibration of human tissue associated with human ... | 09/13/2011 |
| 7706547 | System and method for noise cancellation The invention is directed to a system and method for noise cancellation for an apparatus such as an electric motors or generator. The system may comprise a plurality of actuators, a plurality of phase controllers, each phase controller receiving an input signal repr... | 04/27/2010 |
| 7536018 | Active noise cancellation system In an active noise cancellation system having an adaptive filter that outputs a control signal, first and second speakers that emit a canceling signal generated based on the control signal, a microphone that detects an error signal, a correction filter that corrects... | 05/19/2009 |
| 7353908 | Method and system for attenuating noise from a cabinet housing computer equipment An apparatus for attenuating noise emanating from a cabinet housing noise-generating equipment includes a frame including at least one support member configured to be mountable on the cabinet, proximate the noise-generating equipment, at least one noise attenuation ... | 04/08/2008 |
| 7352870 | Active sound muffler and active sound muffling method An active sound muffler for reducing a sound to be reduced as emitted from a sound source located at one of the opposite sides of a sound insulating wall and diffracted and transmitted to the other side, the muffler comprises a control loudspeaker arranged at the fr... | 04/01/2008 |
| 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 |
| 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 |
| 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 |
| 7340068 | Device and method for detecting wind noise A device for detecting the presence of wind noise in an array of microphones including two or more separate sound inlet openings, and a sound to electrical converting element or microphone in relation to each sound inlet opening. The microphones each generate time d... | 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 |
| 7319399 | System and method for monitoring the wearing compliance of hearing protection devices A system for monitoring the use of a hearing protection unit comprising a left ear hearing protection device (14) and a right ear hearing protection device (12) to be worn by a user (10) within a monitoring area, an arrangement (16, 18, 22, 1... | 01/15/2008 |
| 7317906 | AM radio receiver An AM radio receiver comprises an RF amplifier, a first mixer that converts the RF signal to a first intermediate-frequency signal, a first bandpass filter that band-limits the first intermediate-frequency signal, a second mixer that converts the output from the fir... | 01/08/2008 |
| 7317801 | Active acoustic noise reduction system An active acoustic noise reduction system which comprises a single input transducer and an output actuator that are physically located next to each other in the same location. In one embodiment, the input transducer and the output actuator are a hybrid represented b... | 01/08/2008 |
| 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 |
| 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 |
| 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 |
| 7177433 | Method of improving the audibility of sound from a loudspeaker located close to an ear A method and apparatus for improving the audibility of sound from a loudspeaker located close to an ear, comprises the steps of detecting ambient acoustic noise arriving from other sound sources using a transducer that provides corresponding ambient sound signals, i... | 02/13/2007 |
| 7161528 | Device and method for the suppression of pulsed wireless signals The invention relates to a method of suppressing pulsed signals in particular of DME or TACAN type present in the radio signals received (Ue) by a radio-frequency receiver, characterized in that the reception frequency band of the receiver is divided into frequency ... | 01/09/2007 |
| 7162212 | System and method for obscuring unwanted ambient noise and handset and central office equipment incorporating the same A system for, and method of, obscuring ambient noise. In one embodiment, the system includes: (1) a background sound generator, (2) a mixer coupled to the background sound generator and (3) a user interface, coupled to the mixer, that, upon a user command, causes th... | 01/09/2007 |
| 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 |
| 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 |
| 7110460 | Delta-sigma modulators with integral digital low-pass filtering A delta-sigma modulator of an order of at least three having a signal transfer function defining a signal low-pass response, the signal transfer function has a numerator and a denominator, the denominator defined by a product of first and second functions defining r... | 09/19/2006 |
| 7092529 | Adaptive control system for noise cancellation An adaptive noise canceling system for extracting a desired signal, comprising an adaptive noise cancellation filtering circuit for suppressing noise from a first input signal using a second input signal as a reference signal, and generating an output filtered signa... | 08/15/2006 |
| 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 |
| 7082204 | Electronic devices, methods of operating the same, and computer program products for detecting noise in a signal based on a combination of spatial correlation and time correlation Noise, such as wind noise, for example, may be detected in an electronic device by generating first and second microphone signals. Cross correlation coefficients are determined for the first and the second microphone signals and autocorrelation coefficients are dete... | 07/25/2006 |
| 7059820 | Noise control Methods, devices, and/or systems for controlling vibration and/or acoustic noise. An exemplary method senses noise and/or, for example, rotational speed of a rotating shaft, determines control parameters and actuates one or more actuators. An exemplary device includ... | 06/13/2006 |
| 7039194 | Audio effects synthesizer with or without analyzer The method is provided for simulating an audio effect processor. At least two impulse responses are stored representing the audio processor for input signals having different characteristics. The same characteristic of the input signal is then repeatedly assessed an... | 05/02/2006 |
| 7035327 | Adaptive equalizer for use in information reproducing apparatus Hold registers receive a hold register enable signal. When reading one kind signal of header field data, the hold register enable signal is High and the registers store newly renewed values of filter coefficients, and when reading a different kind signal of recordin... | 04/25/2006 |
| 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 |
| 6973403 | Method and system for identification of system response parameters for finite impulse response systems Methods and systems for determining characteristics of a Finite Impulse Response system that can include applying a number of identical sets of probe signals to the system and averaging the observed outputs. A discrete Fourier transform (DFT) of the averaged outputs... | 12/06/2005 |
| 6961623 | Method and apparatus for controlling a device or process with vibrations generated by tooth clicks A method and apparatus for use in controlling a device or process. The first step of the method involves attaching a detector (20) adapted to detect mechanical vibrations to a person's head (22). A second step involves detecting mechanical vibrations e... | 11/01/2005 |
| 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 (ps) to reduce primary noise (pp) and being located in a first surface; a plurality of errors sensors (2(m)) locat... | 10/25/2005 |
| 6954666 | Method for local reduction of the operating noise produced by a medical diagnostic or therapy device, and medical diagnostic or therapy device having a device for implementing such a method In a method for local reduction of the operating noise produced by a medical diagnostic or therapy device, antisound is produced locally by a sound source. The sound source used is a highly directional parametric loudspeaker. As a result, disturbing operating noises... | 10/11/2005 |
| 6952472 | Dynamically estimating echo return loss in a communication link A method of estimating an echo return loss of a communication link measures the peak power value of a signal received from a far end of a communication link and the corresponding peak power value of a signal received from the near end of the communication link. When... | 10/04/2005 |
| 6944303 | Noise cancellation device, engine-noise cancellation device, and noise cancellation method A phase-locked loop (PLL) circuit generates a sine wave signal synchronized with an input signal. The sine wave signal is directly supplied to a first multiplier. The sine wave signal is also supplied to a second multiplier after shifting the phase by 90 degrees by ... | 09/13/2005 |
