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The Quarterly Review ; March edition, 1825
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| Number | Title | Issue Date |
| 7891463 | 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... | 02/22/2011 |
| 7854295 | Active noise control system An active noise control apparatus and an active noise control system for reducing noise using an active vibrator, such that edges β of the vibrator (i.e. genesis locations of a bending moment of force caused by the vibrator) agree with positions α on a distributio... | 12/21/2010 |
| 7819221 | Lightweight acoustic damping treatment A flexible membrane is attached to an internal wall of the fairing of a flight vehicle. The membrane is inflated with gas to achieve a shape that couples with and thereby attenuates the first acoustic resonance occurring within the volume enclosed by the fairing. A ... | 10/26/2010 |
| 7775320 | 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 f... | 08/17/2010 |
| 7753165 | 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 g... | 07/13/2010 |
| 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 antinoise to the exhaust gas, whereby the antinoise generator has a ... | 05/19/2009 |
| 7530426 | Device for actively reducing sound transmission, and panel comprising such device A device for actively reducing sound transmission, provided with a first and second wall (3, 5) enclosing an inner space (1, 2), wherein at least the second wall (5) is provided with actuators (6), for instance eletromagnetic actuators an... | 05/12/2009 |
| 7416051 | Assembly and method for fan noise reduction from turbofan engines using dynamically adaptive Herschel-Quincke tubes An assembly useful in reducing aircraft engine noise such as turbofan engine noise (730) comprises: (1) at least one tube “H-Q” having an inlet end (738), an outlet end (740) and a central tube portion therebetween; an (ii) at least one actu... | 08/26/2008 |
| 7380635 | Interference-based exhaust noise attenuation An interference-based exhaust noise attenuation device and method for exhaust flow from an internal combustion engine that generates compressive waves in the exhaust flow. The device includes at least a direct path for the exhaust flow; a looped path for the exhaust... | 06/03/2008 |
| 7363769 | Electromagnetic signal transmission/reception tower and accompanying base station employing system of coaxial-flow heat exchanging structures installed in well bores to thermally control the environment housing electronic equipment within the base station An electromagnetic signal transmission/reception tower and accompanying base station housing sensitive electronic equipment within an environment that is thermally controlled by a system employing a plurality of coaxial-flow heat exchanging structures installed in a... | 04/29/2008 |
| 7357220 | Systems and methods for controlling acoustical damping A control system (10) controls a variable acoustical damping device (20) disposed in a sound producing channel (5) of a vehicle engine (1). The control system includes a controller (12) and a selection device (14). The contr... | 04/15/2008 |
| 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 |
| 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 |
| 7308966 | Device for reducing jet engine exhaust noise using oscillating jets A device for reducing engine exhaust noise in an aircraft engine includes a number of oscillating jets which direct an oscillating flow into the engine exhaust. The oscillating jets are connected via channels to a turbomachinery source of high pressure gas, where th... | 12/18/2007 |
| 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 |
| 7278513 | Internal lens system for loudspeaker waveguides This invention provides a lens system for a loudspeaker. The loudspeaker may include a driver unit and a waveguide attached to the driver unit. The loudspeaker further may include a lens system. The lens system may include a plurality of plates. The plates may be po... | 10/09/2007 |
| 7227957 | Noise-suppressing receiver A noise-suppressing receiver is provided. A noise pick-up and a receiver are fixed within a cylinder-like body. An insulation layer is set between the noise pick-up and the receiver. The insulation layer divides the cylinder-like body into a receiver module and a no... | 06/05/2007 |
| 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 generic housing formed from plastic that can be utilized with many differen... | 01/09/2007 |
| 7155333 | Method and apparatus for controlling sound of an engine by sound frequency analysis An apparatus for controlling sound of an engine comprises a sound sensor, an exhaust valve, and a controller. The controller is configured to determine a sound level of a peak sound frequency within a predetermined sound frequency range by use of output from the sou... | 12/26/2006 |
| 7131514 | Noise attenuation device for a vehicle exhaust system A noise attenuation device for a vehicle exhaust system is provided. The device includes an exhaust pipe having a passageway for receiving exhaust gas pulses from an engine. The device further includes a plurality of vanes extending from an inner surface of the pass... | 11/07/2006 |
| 7124856 | Acoustic liner for gas turbine engine A passive acoustic liner system (50) for attenuating a sound field comprising, in acoustic series, a mode-scattering segment (48) and a sound-absorbing segment (40), wherein the mode scattering segment (48) provides a reactance between ... | 10/24/2006 |
| 7117973 | Noise suppressor apparatus for a gas duct A sound damping device (4) for a tubular duct (2), particularly a gas transporting tract of an internal combustion engine (1) having a least one bypass channel (5) running parallel to a main duct (6) in a section of the duct (2 | 10/10/2006 |
| 7117974 | Electronically controlled dual chamber variable resonator An in-line resonator for an air induction system of an internal combustion engine is provided. The system includes a resonator housing, an upstream duct, a downstream duct, a conduit, a partition, and a sleeve. The conduit extends through the resonator housing conne... | 10/10/2006 |
| 7086498 | Noise attenuation device for a vehicle exhaust system A noise attenuation device for a vehicle exhaust system is provided. The device includes an exhaust pipe having a passageway for receiving exhaust gas pulses from an engine. The device further includes a plurality of vanes extending from an inner surface of the pass... | 08/08/2006 |
| 7086497 | Induction system with low pass filter for turbo charger applications A flow tube for an induction system with a turbo charger includes a first tube half and a second tube half with a noise attenuation plate positioned between the halves. The noise attenuation plate includes a plurality of holes having varying diameters and depths. Th... | 08/08/2006 |
| 7077093 | Fresh gas supply system for a combustion engine The present invention relates to a fresh gas supply system for an internal combustion engine, in particular of a motor vehicle. A fresh gas distributor can be connected on the inlet side with a fresh gas feed line, and on the outlet side to an internal combustion en... | 07/18/2006 |
| 7077164 | Pipe A pipe has an innermost layer, outside of which there is an inner electrode layer, outside of which there is an insulating layer, outside of which there is an outer electrode layer. The innermost layer is made of plastic by continuous extrusion and the insulating la... | 07/18/2006 |
| 7044266 | Exhaust muffler for internal combustion engines Performance sound is produced with a muffler that includes a casing with front (5, 37), rear (7, 41) and side (3, 35) walls, first (9, 45) and second (11, 47) compartment walls each with a central passage (25, 28, 46, 48) an... | 05/16/2006 |
| 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 |
| 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 sound field for attenuating noise. The housing defines an air inlet duc... | 04/25/2006 |
| 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 acoustical component. ... | 02/28/2006 |
| 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 |
| 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 channel (4). The longitudinal resonances of the ... | 11/08/2005 |
| 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 |
| 6917687 | Active noise control using a single sensor input An active noise control system (20) includes a controller (34) that receives a signal from a single pressure sensor (36). The controller (34) estimates an engine speed of an engine (30) and a throttle position of a throttle valve a... | 07/12/2005 |
| 6896219 | Process and apparatus for noise reduction in multi-engine propeller-driven aircraft A process and system for noise reduction in multi-engine propeller-driven aircraft. The parameters of at least two propellers are adjusted with regard to frequency, amplitude, and phase so that the sound fields of the propellers are attenuated or completely extingui... | 05/24/2005 |
| 6796859 | Air intake silencer An air intake silencer includes an air inlet pipe and at least one tuning tube in fluid communication with the air inlet pipe. A first length and second length of the air inlet pipe and the tuning tube, respectively, are selected to produce one-half wavelength cance... | 09/28/2004 |
| 6786037 | Segmented mixing device having chevrons for exhaust noise reduction in jet engines Disclosed is a segmented mixing device for reducing jet engine exhaust noise wherein mixing is enhanced between adjacent exhaust flows and between exhaust flow and free-stream flow. The device does so with a very small degradation in aircraft performance. The device... | 09/07/2004 |
| 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 neck produce a passive response to a sound wave produced by the internal... | 07/06/2004 |
| 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 (38) over a microphone reception cavity (40). The microphone (24)... | 03/09/2004 |
