Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 8085945 | Communication machine room wideband noise suppression system In a communication machine room wideband noise suppression system, a sensing unit detects a noise source produced by a fan during the operation thereof and generates a noise input signal and a feedback signal, which are sent to a signal amplifying unit for signal am... | 12/27/2011 |
| 8059827 | Noise reduction apparatus A passive noise reduction apparatus for altering predetermined sound levels of a sound producing device, the noise reduction apparatus includes at least one piezoelectric foil sensor disposed relative to the sound producing device with the at least one piezoelectric... | 11/15/2011 |
| 8054984 | Sound altering apparatus A sound altering apparatus for altering predetermined sound levels of a sound producing device, the sound altering apparatus includes at least one piezoelectric foil sensor disposed relative to the sound producing device with the at least one piezoelectric foil sens... | 11/08/2011 |
| 7894613 | Active noise control rack enclosures Provided is an apparatus and method to control fan noise in a computer server room. An exemplary apparatus includes one or more transducers coupled to one or more walls of a plurality of system racks and one or more active noise control units, wherein the one or mor... | 02/22/2011 |
| 7869607 | Quiet active fan for servers chassis An Active Muffler in the form of a duct having two open ends for conveying air from a within a cabinet to outside the cabinet. A fan or blower is incorporated in the duct. An Automatic Noise Control (ANC) unit is associated with the duct, and at least one microphone... | 01/11/2011 |
| 7783055 | Soundproof climate controlled rack Soundproofing a rack by installing at least one duct on at least one panel of the rack, or as part of the side panels of the rack, or is mounted inside the rack as a drawer in such a way that air can flow outside from the rack causing air to flow from the rack throu... | 08/24/2010 |
| 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 |
| 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 |
| 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 |
| 7277722 | Reducing undesirable audio signals A way of reducing undesirable audio signals is provided. A portable device is provided that comprises a sensor to sense an audio signal and a control unit that is communicatively coupled to the sensor. The control unit is provided to receive a first audio signal fro... | 10/02/2007 |
| 7274794 | Sound processing system including forward filter that exhibits arbitrary directivity and gradient response in single wave sound environment A sound processing system including at least one microphone, an audio processor, and at least one output device. The audio processor includes an analog beamformer, a microphone equalizer, and an apparent incidence processor. Two different embodiments of the apparent... | 09/25/2007 |
| 7139401 | Hard disk drive with self-contained active acoustic noise reduction An active noise reduction system for reducing the acoustic noise generated by a hard disk drive or generated external of a hard disk drive. The active noise reduction system is integrated into the hard disk drive and produces an acoustic waveform that is 180 degrees... | 11/21/2006 |
| 7114323 | Jet exhaust noise reduction system and method A system for reducing jet noise emission from an internally mixed gas turbine engine exhaust, comprising a fan/core flow mixer having a plurality of mixer lobes and a common flow nozzle having an equal number of tabs located along a circumferential edge of an aft en... | 10/03/2006 |
| 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 |
| 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 |
| 7085388 | High frequency jet nozzle actuators for jet noise reduction A noise reduction system for use with an exhaust nozzle associated with a jet engine of an aircraft. The noise reduction system employs a plurality of flow-altering components disposed circumferentially about a lip portion of an exhaust nozzle. In one preferred form... | 08/01/2006 |
| 7065469 | Manufacturing apparatus and method for predicting life of a manufacturing apparatus which uses a rotary machine A manufacturing apparatus which includes a rotary machine, includes: a plurality of accelerometers configured to measure diagnosis time series data attached to the rotary machine at locations where variations of the rotary machine are different; a frequency analysis... | 06/20/2006 |
| 7050971 | Speech recognition apparatus having multiple audio inputs to cancel background noise from input speech A speech recognition apparatus including an audio cancellation module is disclosed. The module includes an audio input for receiving an audio signal from a microphone. The module also includes at least two audio inputs for receiving audio signals from respective ind... | 05/23/2006 |
| 7043029 | Device for use in an audio signal processing system A device for use in an audio signal processing system, the device having at least one operating member for processing an audio signal; and a vibration transmission circuit connected to the operating member to distribute undesired vibration in controlled manner. ... | 05/09/2006 |
| 7020297 | Subband acoustic feedback cancellation in hearing aids A new subband feedback cancellation scheme is proposed, capable of providing additional stable gain without introducing audible artifacts. The subband feedback cancellation scheme employs a cascade of two narrow-band filters Ai(Z) and Bi(Z) alo... | 03/28/2006 |
| 7006641 | Driving circuit, electro-mechanical-acoustic transducer, and portable terminal apparatus A circuit of the present invention is a driving circuit for driving a vibrator having a mechanical vibration system which resonates at a resonance frequency. The driving circuit outputs to the vibrator at least two signals of different frequencies which are included... | 02/28/2006 |
| 6980592 | Digital adaptive equalizer for T1/E1 long haul transceiver The present invention relates to the implementation of a digital adaptive equalizer for a T1/E1 long haul transceiver which is capable of adapting to a wide range of cable types, cable lengths, and/or other data transmission impairments, particularly when the transm... | 12/27/2005 |
| 6931367 | Optimal rib design method for exhaust components A method is provided for designing deformations that will achieve an optimum reduction in vibration related noise in an exhaust system component. The method entails defining an initial shape for an exhaust system component based on available space and exhaust flow c... | 08/16/2005 |
| 6851930 | Noise reduction in an air moving apparatus An air moving apparatus for generating cooling airflow is provided that includes a noise reduction system for reducing noise generated by a fan. The air moving apparatus includes a fan having a rotatable hub and a plurality of blades mounted to the hub for rotating ... | 02/08/2005 |
| 6768799 | Appliance incorporating sound cancellation system Two electrical power components used in the course of operating an appliance are configured to operate at frequencies which are out-of-phase with respect to one another such that operating noises produced by the first component are effectively reduced in magnitude b... | 07/27/2004 |
| 6755616 | Method of noise value control by controlling the rotation rate of a fan A method of noise value control by controlling the rotation rate of a fan utilizes a set temperature control plot to estimate the noise value of fans and temperature changes of CPUs corresponding to the fans to optimize thermal energy absorption, achieve a suitable ... | 06/29/2004 |
| 6654467 | Active noise cancellation apparatus and method An active noise cancellation apparatus and method for actively reducing the level of noise generated by an ambient noise source, such as a domestic appliance. This active noise cancellation apparatus has a pickup device (1, 20) to translate the noise into... | 11/25/2003 |
| 6625285 | Acoustic cooling system with noise reduction function The invention provides an acoustic cooling system with a noise reduction function of the type wherein a driving condition of a sound source used in the acoustic cooling system is controlled to compress coolant by a sound wave and a cooling object is coole... | 09/23/2003 |
| 6512831 | Noise abatement apparatus for appliance cabinet and method for reducing noise generated by an appliance Apparatus for reducing noise emitted from an appliance having a cabinet that supports at least one component that emits at least one acoustic pressure wave therefrom. In a preferred form, the apparatus comprises at least one diffuser having at least one d... | 01/28/2003 |
| 6466673 | Intracranial noise suppression apparatus An apparatus for suppressing an induced intracranial noise or vibrational signal within a patient's head due to a drilling or cutting medical instrument. The apparatus includes a mechanism for sensing the intracranial vibrational signal induced within the... | 10/15/2002 |
| 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 electronic device, particularly noise generated by a cooli... | 03/19/2002 |
| 6290140 | Energy management system and method A method is provided for managing the energy usage of an energy consuming system adapted to determine the energy of a controlled space, the energy consuming system including a plurality of operating components having on and off states and a plurality of d... | 09/18/2001 |
| 6204830 | Monitor having base with sound reproducing element for providing sound frequencies at self-resonant frequency The invention relates to a monitor comprising a picture tube and an audio part mounted on a base. The picture tube unit (1) of the monitor includes main sound reproduction elements (6, 7) for the production of sound frequencies deviating from the self-res... | 03/20/2001 |
| 6188770 | Fan noise canceller A fan noise canceller comprises a rotation information detecting means 2 (or 12) for detecting noise information of a fan 1 (11), a band-pass filter 3 (13) for extracting the blade passing frequency from the noise information, an output control means 4 (1... | 02/13/2001 |
| 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 enclosure and an amplifier is disposed within the housing and ... | 06/06/2000 |
| 6049615 | Intergrated active noise control system for air handling unit The internal fan arrangement of an AHU is reconfigured by discharging directly from the scroll into a 90° elbow. The bend of the elbow defines a converging section terminating in a throat which leads to a diverging section. Additionally, the ANC structur... | 04/11/2000 |
| 5995632 | Fan noise canceller A fan noise canceller includes a rotation information detecting device for detecting noise information of a fan, a band-pass filter for extracting the blade passing frequency from the noise information, an output control device for controlling the amplitu... | 11/30/1999 |
| 5692053 | Active acoustic transmission loss box The invention relates to noise or sound control achieved by enclosing the noise source in an active enclosure. Arrays of vibration inputs (for example, shakers, piezoceramics, etc.) are attached to the walls of the active enclosure, or loudspeakers locate... | 11/25/1997 |
| 5692054 | Multiple source self noise cancellation A repetitive noise cancellation system for multiple noise sources employing a controller (36) which senses radiated noise by reference sensors (35) and the status of the noise sources by position sensors (37, 38) and automatically controls one of the nois... | 11/25/1997 |
| 5689572 | Method of actively controlling noise, and apparatus thereof In an active noise-reduction controlling apparatus, there are provided a reference sensor for outputting a reference signal corresponding to information about a noise source, a noise-reduction error sensor for detecting a noise-reduction condition, an add... | 11/18/1997 |
