| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 181206000 | By wave interference | 15 |
| 20080196967 | Active Countersound System with Special Arrangement of the Secondary Actuators for Reducing the Passage of Sound at an Open Boundary Area of Two Volumes; Active Countersound Arrangement; Method for Actively Reducing Sound - An active countersound system for actively reducing the sound waves of primary sound waves, with a regulator unit, an error sensor, a reference sensor and several secondary actuators. The secondary actuators are designed to emit countersound waves, wherein the regulator unit, which is coupled to the secondary actuators, processes an error signal and a reference signal, and generates a secondary signal, which by way of the coupling is conveyed to the secondary actuators in order to control the secondary actuators by means of the secondary signal such that said secondary actuators generate countersound waves that reduce the error signal so that optimal sound wave abatement is implemented, wherein the secondary actuators are arranged such that they are located on the margin of an open passage area, which passage area comprises a margin and is to be penetrated by the primary sound waves, in order to ensure active sound wave abatement of the open space that in the direction of passage is arranged behind the open passage area, of the countersound waves in the manner of a curtain. | 08-21-2008 |
| 20080236937 | RESONATOR WITH INTERNAL SUPPLEMENTAL NOISE ATTENUATION DEVICE - A resonator for an induction system includes an inlet and outlet with a resonator cavity arranged therebetween. A tube is arranged within the resonator cavity and at least partially extends between the inlet and outlet. In one example, at least one supplemental noise attenuation device is in communication with the arcuate tube, such as a quarter wave tube and/or Helmholtz resonator. A large opening is provided in the tube that opens into the resonator cavity. In one example, the large opening is arranged on an outer radius side and faces a large cavity portion of the resonator cavity. Additional supplemental noise attenuation is provided by a collar arranged concentrically relative to the tube providing an annular quarter wave tube that is coaxial with the direction of flow from the outlet. | 10-02-2008 |
| 20080236938 | INDUCTION SYSTEM DUCT WITH NOISE ATTENUATING HOLES - A duct for an induction system is provided that has an effective length between an inlet and outlet. An aperture is provided a wall of the duct at a location corresponding to a pipe resonance for attenuating noise at the pipe resonance frequency. In one example, the aperture is provided using a cluster of holes arranged at the location. Multiple apertures are arranged about a circumference of the duct, for example, at opposing sides of the duct. In one example, an aperture is provided at a distance of approximately one quarter the effective length from both the inlet and the outlet. A porous non-woven structure is arranged over the aperture to minimize pressure losses associated with the aperture. | 10-02-2008 |
| 20090008185 | Double-glazed windows wth inherent noise attenuation - The present invention relates to a noise attenuating window comprised of two panes of glass separated by a spacer tube. The spacer tube contains T-shaped acoustic resonator capable of targeting a single mode or multiple-mode to be attenuated. | 01-08-2009 |
| 20090057054 | SOUND GENERATOR WITH STRUCTURALLY AND ACOUSTICALLY COUPLED SOUND RADIATION PANEL AND METHOD FOR MANUFACTURING THE SAME - A sound generator for a vehicle is provided, including a hollow drum having a sound radiation panel structurally and acoustically coupled thereto. The drum has an aperture formed in an outer wall thereof. The drum is adapted to be in fluid communication with an air conduit of the vehicle. The sound radiation panel covers at least a portion of the aperture and is adapted to radiate sound energy to at least one of an engine compartment and an interior of the vehicle. A vehicle system including the sound generator and a method for manufacturing the sound generator are also provided. | 03-05-2009 |
| 20090173568 | Device and method for active noise cancellation in exhaust gas channel of a combustion engine - In a method and a device for canceling the noise in an exhaust gas channel of a vehicle, a noise signal is received from the exhaust gas channel using a sound sensor, and a frequency signal which has the same amplitude and the opposite phase as the noise signal is generated. The generated frequency signal is acoustically mixed with the noise signal in the exhaust gas channel using a sound converter, there by reducing the noise in the exhaust gas channel. In addition, the temperature in the exhaust gas channel is calculated based on the received sound signal. | 07-09-2009 |
| 20090205903 | METHOD AND SYSTEM FOR ACTIVELY INFLUENCING NOISE, AND USE THEREOF IN A MOTOR VEHICLE - Method for influencing noise, wherein a noise source ( | 08-20-2009 |
| 20090236173 | METHOD FOR REDUCING NOISE IN A VEHICLE CABIN - A method of controlling noise from a six cylinder engine that can selectively use in separate operating modes either three cylinders, four cylinders, or all six cylinders, is provided that uses a noise cancellation system to provide a cancellation sound at a first frequency representative of the engine operating mode. When the vehicle changes, for example, from a three cylinder utilization mode to six cylinder utilization mode, the method extends the provision of the noise cancellation sound, at a frequency representative of three cylinder operation, beyond the time when three cylinder mode is changed to six cylinder mode. As a result, a residual “pop” noise associated with the vehicle exhaust, that is traditionally heard during the transition period is cancelled and no longer noticeable. The method also includes implementation of a waiting time before a providing cancellation sounds of different frequencies, to avoid amplitude mismatch. | 09-24-2009 |
| 20090255754 | ACTIVE MUFFLER - The present invention to an active muffler for an exhaust gas system of an internal combustion engine, in particular in a motor vehicle, includes a multi-shell housing having a pot-shaped top shell and a pot-shaped bottom shell, a funnel-shaped sound conducting body, which is inserted into the bottom shell and has a connection passing through the bottom shell and out of the housing, a loudspeaker, which is situated in the top shell and is attached to a flange section of the sound conducting body at a distance from the connection, such that a free inside cross section of the sound conducting body surrounded by the flange section is closed with an airtight seal, and a bypass through which an interior space of the top shell is connected to an interior space of the bottom shell so they communicate. | 10-15-2009 |
| 20090260916 | 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 signal which has same amplitude as of noise signal but opposite phase, is generated, the generated frequency signal is acoustically mixed with the noise signal in the exhaust gas channel, using a sound converter, there by reducing the noise in the exhaust gas channel. The device also takes into account the reflection of the sound caused by an obstacle near the exhaust gas channel. A distance measuring device which is external to the active noise cancellation device provides the information about the distance between the obstacle and the exhaust gas channel. Based on the distance, the frequency signal is suitably modified to reduce the effect of sound reflections caused by the obstacle. | 10-22-2009 |
| 20090301805 | ACTIVE NOISE CONTROL SYSTEM - Edges β of a vibrator, that is, genesis locations of a bending moment of force caused by a vibrator, agree with positions α on a distribution of the bending moment of force caused by noise vibration of a panel, where the sign of the distribution of bending moment of force is reversed. As a result, control vibration approximate to the noise vibration can be excited. Accordingly, when the vibrator is fixed by agreeing the edges β of the vibrator with the positions α determined by noise frequency desired to be reduced, noise due to a target noise frequency can be effectively reduced. | 12-10-2009 |
| 20100252358 | Airflow Optimization and Noise Reduction in Computer Systems - In one embodiment, a fan is used to generate airflow through a computer chassis to a fan air inlet. An audible frequency component of the airflow is identified and selected. A sound wave is generated having a generated frequency equal to the selected audible frequency component of the airflow. The generated sound wave is introduced into the airflow with the generated frequency out of phase with the audible frequency component of the airflow. The magnitude of the generated frequency may be selected as a function of fan speed and/or air sensed pressure within the airflow. The frequency, phase, and magnitude of the generated sound wave may be selected and enforced by a baseboard management controller. | 10-07-2010 |
| 20120097477 | STANDING WAVE ATTENUATION DEVICE - A standing wave attenuation device is installed in a cabin of a vehicle so as to reduce a standing wave caused by external noise such as road noise. The standing wave attenuation device provides a closed loop including a feedback comb filter with a feedback loop, a microphone, a speaker, and a delay element. The delay element adjusts the phase of the output signal of the feedback comb filter such that the time needed for one-time circulation of a signal through the feedback loop matches a half period of the standing wave. An original sound including the standing wave is picked up by the microphone and subjected to processing so that the speaker produces a sound wave with the inverse phase against the phase of a sound wave constituting the standing wave, so that the standing wave is canceled out by the sound wave emitted from the speaker. | 04-26-2012 |
| 20190147847 | INFORMATION SECURITY/PRIVACY VIA A DECOUPLED SECURITY CAP TO AN ALWAYS LISTENING ASSISTANT DEVICE | 05-16-2019 |
| 20190147848 | INFORMATION CHOICE AND SECURITY VIA A DECOUPLED SECURITY CAP TO AN ALWAYS LISTENING ASSISTANT DEVICE | 05-16-2019 |
