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7533759 Active muffler for an exhaust system  
The present invention relates to an active muffler for an exhaust gas system of an internal combustion engine, in particular in a motor vehicle, having at least one antinoise generator for applying...
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,...
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...
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...
7248704 Active sound attenuation device to be arranged inside a duct, particularly for the sound insulation of a ventilating and/or air conditioning system  
The device for the active sound attenuation of a sound signal propagated in a duct comprises: at least first sensor means for a first sound signal, attenuation actuating means supplying an active...
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...
7162040 Mounting assembly for active noise attenuation system  
An active noise attenuation system includes a speaker housing for a speaker assembly that attenuates noise generated by an air induction system for a vehicle engine. The speaker housing is a...
7158644 Active noise control system  
A first rectifying net, a rectifying grid and a second rectifying net are attached, as a rectifying part upstream of a duct through which air for cooling flows. A noise detection microphone detects...
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...
7035414 Active noise attenuation system  
An active noise attenuation system for an air induction assembly includes a housing that is mounted to a vehicle structure and a speaker assembly that is mounted within the housing to generate a...
7006639 Active noise-attenuating duct element  
The active HVAC duct element can be inserted into a HVAC duct for attenuation of noise. The element works with an acoustical series arrangement of a passive acoustical component and an active...
6996242 Integrated and active noise control inlet  
A modular air induction assembly comprises an air induction body, an air filter operatively attached to the air induction body, and a speaker operatively attached to the air induction body. The...
6963647 Controlled acoustic waveguide for soundproofing  
The invention relates to a controlled acoustic wave guide configured as an elongated hollow chamber ( 1 ) which via an opening ( 2 ) in its first face end ( 3 ) is connected to a sound-conducting...
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...
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...
6901147 Three-dimension active silencer  
A three-dimension active silencer includes a measuring unit for detecting a signal relating to a sound radiated from a target sound source which is located in a closed box. A plurality of...
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...
6847722 Method and equipment for attenuating sound in a duct  
The invention relates to a method and an equipment for attenuating sound in a duct. Sound propagating in a duct is detected by means of a detector ( 2 ) and attenuated by using two successive...
6839439 Method and apparatus for active noise control in an air induction system  
An air induction system for an internal combustion engine utilizes localized heat generation to produce a desired acoustic profile that attenuates noise propagated through the air induction system....
6804360 Air intake noise reduction apparatus for automotive vehicle  
An air intake noise reduction apparatus is provided which can effectively reduce air intake noise even with simple construction requiring a small number of components. Four air intake passages 24,...
6768800 Active noise controller and controlling method  
An active noise controller includes a duct ( 2 ) of a stainless steel having the shape of a pipe and provided with an opening ( 1 ) at a first end thereof, and a loudspeaker ( 3 )connected to a...
6758304 Tuned Helmholtz resonator using cavity forcing  
A Helmholtz resonator includes a chamber at least partially defining a cavity. The chamber has a neck which defines a passage that is in fluid communication with the cavity. The chamber and the...
6728385 Voice detection and discrimination apparatus and method  
An apparatus and a method of voice detection and discrimination apparatus for controlling a voice operated system. A protective ear terminal element in the apparatus protects the ear by providing...
6725150 Turbo-charged vehicle engine sound simulator  
A turbo-charged vehicle engine sound simulator ( 10 ) that is designed to function in combination with a vehicle having a coil ( 92 ), a tachometer ( 94 ), an alternator ( 96 ), an engine manifold...
6702061 Environmentally protected microphone for an active noise control system  
An air introduction system ( 10 ) includes an active noise control system ( 22 ) having an environmentally protected microphone ( 24 ). A microphone support structure ( 26 ) defines a louvered cage...
6688422 Method and apparatus for actively influencing the intake noise of an internal combustion engine  
A method and apparatus for actively influencing the intake noise of an internal combustion engine. The apparatus comprises a controller ( 7 ) which senses the actual noise (I) via a microphone ( 16...
6648750 Ventilation assemblies  
A ventilation assembly ( 10 ) for a window or door assembly is provided with an anti-sound system ( 80 ). The anti-sound system may include a sound generator ( 82 ), a noise sensor ( 88 ) and an...
6634457 Apparatus for damping acoustic vibrations in a combustor  
An apparatus for damping acoustic vibrations in a combustor as well as a corresponding combustor arrangement with the apparatus. The apparatus includes a Helmholtz resonator ( 4 ) that can be...
6633646 Method and apparatus for controlling exhaust noise  
The present invention relates to noise reduction technology for controlling exhaust noise in internal combustion engines such as an automobile engine and/or noise in a duct of an air delivery...
6605131 Integrated active noise control with self-cleaning filter apparatus  
An air induction system with active noise control includes a self-cleaning air filter that is integrated within an air intake housing. The self-cleaning air filter filters out contaminants such as...
6560342 Smart foam for active noise control in a duct and device equipped with the same  
The present invention relates to a smart foam for active noise control in a duct and a device equipped with the same. In particular, the smart foam for the active noise control in a duct according...
6418227 Active noise control system and method for on-line feedback path modeling  
A feedforward active noise control system ( 50 ) is provided for generating an anti-noise signal to attenuate a noise signal provided through a media. The feedforward active noise control system (...
6385321 Reactive sound absorber  
A reactive sound attenuator which includes a sensor for detecting a sound parameter in a space, e.g. a duct, consists of a signal amplifier that is used to amplify a detected signal, an...
6359989 Acoustic filter apparatus for an electronic device  
An apparatus for reducing noise emitted by an electronic or other device and such devices incorporating the noise reducing apparatus. A mechanism for acoustically filtering undesired noise from an...
6330336 Active silencer  
Pseudo space transmitting signal processing means of the signal processing means simulates the frequency response of the space up to the silencing point from a noise source, while pseudo inverse...
6327368 Configuration of providing microphone in duct and active noise reduction device using same  
A configuration of providing a microphone in a duct having an air current therein, for use in an active noise reduction device for reducing noise propagating in the duct by producing sounds...
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...
6201872 Active control source cancellation and active control Helmholtz resonator absorption of axial fan rotor-stator interaction noise  
The present invention is an active-control system for attenuating noise in a duct having a fluid flow. An array of stators having a longitudinal length is positioned axially within the duct. A...
6192133 Active noise control apparatus  
A speaker, serving as an additional sound source, is provided close to a noise source, two microphones are arranged on a central axis of a vibration surface of the speaker to be spaced from each...
6160892 Active muffler  
In the active muffler disclosed herein, a porous flow resistive member defines a wall of a duct carrying a noisy flow, e.g., a jet exhaust. The flow resistive member is characterized by having a...
6084971 Active noise attenuation system  
A noise attenuation system for the air induction ducting particularly for an internal combustion engine has an outwardly facing loudspeaker mounted within an air inlet duct so as to lie in the...
6078671 Silencer for attenuating a sound or noise transmitted through an air passage of a duct  
A silencer is adapted to be mounted on an air duct. The silencer includes a noise detecting microphone for detecting a noise transmitted through the air passage of the duct, a loud speaker for...
6072880 Modular active silencer with port dish  
A modular Active Noise Control exhaust silencing system is provided including a housing defining an acoustic enclosure having an acoustic outlet port. A speaker is disposed within the acoustic...
6005952 Active attenuation of nonlinear sound  
This invention regards a method and an arrangement for attenuating undesirable high amplitude output sound of an acoustic system 2 by injecting a canceling sound produced by a controller 10 and...
6005957 Loudspeaker pressure plate  
An apparatus for mounting a loudspeaker within an enclosure is disclosed. The apparatus includes a loudspeaker mounting plate formed within the enclosure, and a mounting boss formed within the...
5979593 Hybrid mode-scattering/sound-absorbing segmented liner system and method  
A hybrid mode-scattering/sound-absorbing segmented liner system and method in which an initial sound field within a duct is steered or scattered into higher-order modes in a first mode-scattering...
5930371 Tunable acoustic system  
An acoustic resonator (20) has a resonator cavity (22) with a resonator port (24) for communicating with an exhaust flow passage (26) conducting acoustic waves therethrough. Adjustable port...
5852667 Digital feed-forward active noise control system  
A method of noise control of an acoustic signal comprising: obtaining a reference signal of the acoustic signal to be controlled, applying an antinoise signal to the acoustic signal so as to...
5850458 Apparatus and method for actively reducing noise in vehicular passengers compartment  
In an apparatus and method for actively reducing air intake noise of an air intake system of a vehicular internal combustion engine, a sound wave having approximately the same amplitude, and a...
5848168 Active noise conditioning system  
An active noise conditioning system for use with a combustion engine exhaust system is provided. A controller receives an exhaust noise signal, along with various other feedback signals for...
Matches 1 - 50 out of 138 1 2 3 >