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| Number | Title | Issue Date |
| 8189800 | Active silencer and method for controlling active silencer An active silencer includes: a speaker generating control sound which interferes with noise; a microphone detecting noise remaining after the interference as a remaining noise signal; a sound quality evaluation unit evaluating the sound quality of the remaining nois... | 05/29/2012 |
| 8135140 | System for active noise control with audio signal compensation An active noise control system generates an anti-noise signal to drive a speaker to produce sound waves to destructively interfere with an undesired sound in a targeted space. The speaker is also driven to produce sound waves representative of a desired audio signal... | 03/13/2012 |
| 8085943 | Noise extractor system and method A noise extraction method in which an environmental input which includes a noise indicia is selectively modified in accordance with an algorithm that includes one or more factors representing time response, amplitude of response, and error correction. The algorithm ... | 12/27/2011 |
| 8085944 | Device and method for active noise cancellation in an exhaust gas channel of a combustion engine The invention relates to an active noise cancellation device. The invention proposes a device and a method used to cancel the noise in an exhaust gas channel of a vehicle A noise signal is received form the exhaust gas channel, using a sound sensor, a frequency sign... | 12/27/2011 |
| 8045724 | Ambient noise-reduction system A signal processing circuit is intended for use in a noise reduction system, which produces a target filter characteristic that would achieve optimal noise cancellation, the target filter characteristic including a resonant peak at a first frequency. The signal proc... | 10/25/2011 |
| 8014538 | Active noise reducing device An active noise reducing device includes switchover frequency memory which stores a speaker having weaker influence of level drop or dips in gain characteristics of transmission from first speaker and second speaker both working as secondary noise generators to micr... | 09/06/2011 |
| 7693292 | Method and apparatus for canceling fan noise in a computer system One embodiment of the present invention provides a system that cancels fan noise in a computer system. During operation, the system obtains a fan noise signal using a microphone. Next, the system generates a spectral pattern based on the obtained fan noise signal. T... | 04/06/2010 |
| 7369115 | Haptic devices having multiple operational modes including at least one resonant mode An apparatus comprises a signal source, a driver and an electro-mechanical transducer. The signal source is configured to output a haptic feedback signal. The driver is configured to receive the haptic feedback signal and output a drive signal. The electro-mechanica... | 05/06/2008 |
| 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 |
| 7352874 | Apparatus for acoustically improving an environment and related method The invention provides an apparatus and related method for acoustically improving an environment. In an embodiment of the invention, an apparatus comprises a partitioning means in the form of a curtain for producing a discontinuity in a sound conducting medium, such... | 04/01/2008 |
| 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 |
| 7327849 | Energy density control system using a two-dimensional energy density sensor A system and method of reducing noise in an enclosure is disclosed. The method includes receiving at least one reference signal; receiving pressure signals from no more than two substantially orthogonally placed pairs of acoustic sensors, where one pair of acoustic ... | 02/05/2008 |
| 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 |
| 7293627 | Active exhaust muffler An active exhaust muffler for an exhaust system of an internal combustion engine, having a housing through which a pipe system passes, the pipe system designed to be permeable for airborne sound in a first space, having an antisound generator which is arranged in a ... | 11/13/2007 |
| 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 |
| 7232308 | Method and device for affecting thermoacoustic oscillations in combustion systems The present invention relates to a method and a device (1) for affecting thermoacoustic oscillations in a combustion system (6) comprising at least one burner (7) and at least one combustor (8). In order to improve the action of af... | 06/19/2007 |
| 7190796 | Active feedback-controlled bass coloration abatement A system for actively damping the low-frequency coloration of sound in a listening room is provided comprising an acoustic wave sensor, an acoustic wave actuator, and an electronic feedback controller. The listening room defines at least one mode of low-frequency co... | 03/13/2007 |
| 7181021 | Apparatus for acoustically improving an environment The invention provides an apparatus and related method for acoustically improving an environment. In an embodiment of the present invention, an electronic sound screening system includes a portion for receiving acoustic energy and converting it into electrical signa... | 02/20/2007 |
| 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 |
| 7155388 | Method and apparatus for characterizing inhalation noise and calculating parameters based on the characterization A method for characterizing inhalation noise within a pressurized air delivery system, the method including the steps of: generating an inhalation noise model (912, 1012) based on inhalation noise; receiving an input signal (802) that includes inhalati... | 12/26/2006 |
| 7148648 | Controller for controlling actuator device installed on vehicle so as to maintain silence and comfort in vehicle A controller for controlling an actuator device which is installed on a vehicle and operated by a motor. The controller includes: a motor control portion operable to control the motor on the basis of a target value; and a target-value determining portion operable to... | 12/12/2006 |
| 7130433 | Noise reduction apparatus and noise reduction method An apparatus for reducing noise component contained in an input signal has: a detecting device for detecting a level of the noise component; an adjusting device for adjusting a level of the input signal so as to make the level of the noise component equal to or lowe... | 10/31/2006 |
| 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 |
| 7112139 | Gaming machine with ambient noise attenuation A gaming machine in a gaming establishment enhances its game sounds by attenuating ambient noise in the establishment. The gaming machine includes a microphone, processing circuitry, and an audio speaker. The microphone detects ambient noise and generates a noise si... | 09/26/2006 |
| 7106867 | Active noise cancellation for a vehicle induction system having selectable engine noise profile An active noise cancellation system (26) for controlling engine noise propagation through a vehicle induction system (32) is customizable to achieve a desired engine noise profile. A controller (34) of the active noise cancellation system drives... | 09/12/2006 |
| 7075363 | Tuned continuous time delay FIR equalizer An analog finite impulse response (“FIR”) filter generates a continuous time output using a chain of tunable delay elements. The tunable delay elements generate a time delay in an input signal. A calibration circuit, consisting of a control loop, tunes the delay... | 07/11/2006 |
| 7072627 | Method and apparatus for adjusting signal component strength A first signal component is received having a first signal strength and a second signal component is received having a second signal strength. A difference is identified between the first signal strength and the second signal strength. A determination is made as to ... | 07/04/2006 |
| 7047111 | Method and system for controlling and/or regulation a load of a vehicle In order to improve a noise emission or noise emission which is caused by a vehicle, according to the invention the instantaneous load (L) of the vehicle (F) is determined with a method for controlling and/or regulating a load (L) of a vehicle (F) by means of a pick... | 05/16/2006 |
| 7003120 | Method of modifying harmonic content of a complex waveform A method of manipulating a complex waveform by considering the harmonic and partial frequencies as moving targets over time in both amplitude and frequency and adjusting the moving targets by moving modifiers in both amplitude and frequency. The manipulation of harm... | 02/21/2006 |
| 6993479 | Method for the compression of recordings of ambient noise, method for the detection of program elements therein, and device thereof The amount of data produced in the process of recording even short hearing samples by means of a monitor (1) may be considerably reduced by effecting a normalization to a range of values D and a subsequent nonlinear mapping to a second, preferably smaller ran... | 01/31/2006 |
| 6973193 | Fan and compressor noise attenuation An exciting sound wave generator is positioned within a nacelle of a jet engine at its inlet to generate an exciting sound wave having a primary frequency generally different from a frequency of the primary tone of the noise. The exciting sound wave is used to modul... | 12/06/2005 |
| 6957516 | Acoustically intelligent windows A window having a frame with a windowpane disposed therein is provided. A first impedance discontinuity element is disposed between the windowpane and the frame adjacent a portion of a periphery of the windowpane. A second impedance discontinuity element is disposed... | 10/25/2005 |
| 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 |
| 6959093 | Low frequency active noise control A noise attenuation system (10) for an air induction system (12) includes an air inlet duct (16) having an open end (18) to draw in air and a loudspeaker (22) mounted within the inlet duct (16) and facing the open end (18... | 10/25/2005 |
| 6952600 | Control of audio data of a mobile station in a cellular telecommunication system Controlling the presentation of audio data in a communication device includes receiving a certain first signal sequence with a microphone of the communication device, saving the first signal sequence to a temporary memory of a detector unit, receiving a certain seco... | 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 |
| 6940983 | Resonator for active noise attenuation system An active noise attenuation system for an air induction assembly is operably connected to an engine that generates a low frequency noise having a noise profile defining a peak noise. The system has an air inlet duct housing with an inlet and an outlet connected to t... | 09/06/2005 |
| 6914989 | Device and method for calibration of a microphone A device for and method of calibrating a microphone, includes a loudspeaker (3) for converting a loudspeaker input signal (5) into sound; a microphone (4) for converting received sound into a microphone output signal (16), and a calibrati... | 07/05/2005 |
| 6907128 | Noise canceling apparatus for weight measurement, and noise canceling method for weight measurement A noise canceling apparatus (1) comprises an amplifier (10) for amplifying a measured signal (ms) outputted from a measuring device (3), an analog filter (11), an ADC (12), a digital filter (14), a coefficient control sectio... | 06/14/2005 |
