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"Rail travel at high speeds is not possible because passengers, unable to breathe, would die of asphyxia."
Dionysius Lardner, Professor of Natural Philosophy and Astronomy at University College, London ; 1830
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| Number | Title | Issue Date |
| 8068616 | Methods and systems for controlling noise cancellation A method for detecting failure in a noise cancellation system is provided. The noise cancellation system is operable to at least partially cancel an unwanted noise produced by a noise source. The method includes receiving a cancellation noise signal from the noise c... | 11/29/2011 |
| 7925028 | Electronic device having a blower with noise control An electronic device having a first motor which rotates a rotating body (for example, blades) about a rotation axis and a second motor which vibrates a vibrator including the rotating body in the axial direction is provided. A control IC unit has a first circuit whi... | 04/12/2011 |
| 7835529 | Sound canceling systems and methods A system for sound cancellation includes a source microphone for detecting sound and a speaker for broadcasting a canceling sound with respect to a cancellation location. A computational module is in communication with the source microphone and the speaker. The comp... | 11/16/2010 |
| 7439873 | Synthetically generated sound cues Communication systems and apparatus to allow a user to perceive the relative spatial location or present position of other elements of interest in a control space, such as the location of a speaker participating in a telephone conference or that of an aircraft carri... | 10/21/2008 |
| 7433484 | Acoustic vibration sensor An acoustic vibration sensor, also referred to as a speech sensing device, is provided. The acoustic vibration sensor receives speech signals of a human talker and, in response, generates electrical signals representative of human speech. The acoustic vibration sens... | 10/07/2008 |
| 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 |
| 7340064 | Active noise control system An active noise control system is provided which cancels a noise using a secondary noise from a speaker that is operated in accordance with an output from an adaptive controller. The system is configured such that microphone monitor interrupts a switch to thereby st... | 03/04/2008 |
| 7336793 | Loudspeaker system for virtual sound synthesis A sound system obtains a desired sound field from an array of sound sources arranged on a panel. The desired sound field allows a listener to perceive the sound as if the sound were coming from a live source and from a specified location. Setup of the sound system i... | 02/26/2008 |
| 7330583 | Integrated visual imaging and electronic sensing inspection systems Integrated inspection and test systems for liquid crystal display (LCD) active plates. The integrated inspection and test systems may combine visual imaging inspection and an electronic sensing such as voltage imaging, electron beam sensing or charge sensing, in whi... | 02/12/2008 |
| 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 |
| 7317801 | Active acoustic noise reduction system An active acoustic noise reduction system which comprises a single input transducer and an output actuator that are physically located next to each other in the same location. In one embodiment, the input transducer and the output actuator are a hybrid represented b... | 01/08/2008 |
| 7305886 | Noise detecting apparatus An accurate measure of normally operating noise is required for a useful noise measurement system. A device is needed to make a representative measure of the boat's acoustic power using measured boat sound level with integrated corrections for sensed distance to the... | 12/11/2007 |
| 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 |
| 7286907 | Method and apparatus for conserving power consumed by a refrigerated appliance utilizing audio signal detection A refrigerated appliance that dispenses items for use with a power source and includes a cooling system. Power control circuitry is electrically coupled between the power source and components (for example, a compressor and one or more circulating fans of the coolin... | 10/23/2007 |
| 7253623 | Magnetic resonance imaging apparatus and magnetic field forming apparatus Occurrence of noise is to be prevented, and image quality improved. Dynamic dampers which damp vibration attributable to the gradient coil unit are arranged in positions which are extending areas of a gradient coil unit extending to protrude out of an accommodating ... | 08/07/2007 |
| 7248980 | Method and apparatus for removing quantization effects in a quantized signal One embodiment of the present invention provides a system that reconstructs a high-resolution signal from a set of low-resolution quantized samples. During operation, the system receives a time series containing low-resolution quantized signal values which are sampl... | 07/24/2007 |
| 7241258 | Passive vibration isolation of implanted microphone A system for reducing the vibration sensitivity of an implantable microphone without an equal or greater reduction in sound sensitivity. The system reduces non-ambient vibrations by placing at least one compliant member into the path of transmission for tissue-borne... | 07/10/2007 |
| 7218240 | Synthetically generated sound cues Communication systems and apparatus to allow a user to perceive the relative spatial location or present position of other elements of interest in a control space, such as the location of a speaker participating in a telephone conference or that of an aircraft carri... | 05/15/2007 |
| 7214179 | Low acceleration sensitivity microphone An implanted microphone is provided that has reduced sensitivity to vibration and attendant acceleration forces. In this regard, the microphone differentiates between the desirable and undesirable components of a transcutaneously received signal. More specifically, ... | 05/08/2007 |
| 7203590 | Method and device for controlling an internal combustion engine A device and a method for controlling an internal combustion engine, in which, based on a signal that characterizes the vibrations of an internal combustion engine, at least one feature is determined and used to regulate and/or control operating parameters of the in... | 04/10/2007 |
| 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 |
| 7139400 | Microphone calibration for active noise control system An active noise control system (100) and method compensates for changes in a microphone output to maintain accurate noise control. A calibration signal reflecting a desired microphone output is generated and stored in an active noise control module (106 | 11/21/2006 |
| 7117754 | Torque ripple sensor and mitigation mechanism A torque ripple sensor and method for torque ripple sensing and/or mitigation. A piezoelectric sensor is positioned relative to a motor so that torque fluctuations due to torque ripple of the motor are transmitted to the sensor, resulting in strain of a piezoelectri... | 10/10/2006 |
| 7113605 | System and process for time delay estimation in the presence of correlated noise and reverberation A system and process for estimating the time delay of arrival (TDOA) between a pair of audio sensors of a microphone array is presented. Generally, a generalized cross-correlation (GCC) technique is employed. However, this technique is improved to include provisions... | 09/26/2006 |
| 7107127 | Computationally efficient means for optimal control with control constraints A method and system that reduces undesired vibration in a vehicle measures ambient vibration and generates a first command signal based upon the measured vibration. If a first component of the first command signal exceeds a maximum allowable, the first component of ... | 09/12/2006 |
| 7103188 | Variable gain active noise cancelling system with improved residual noise sensing An active noise cancellation system includes a series of features for more effective cancellation, greater reliability, and improved stability. A particular feature adapted for headset systems includes locating a residual microphone radially offset from the center o... | 09/05/2006 |
| 7062333 | Optimal solution search device, device for controlling controlled object by optimizing algorithm, and optimal solution search program To provide an algorithm-based optimizing controller which can search for an optimal solution in line with user requirements with reduced time requirements for optimization. An interactive optimizer 310 searches for an optimal solution of a responsivity... | 06/13/2006 |
| 7062049 | Active noise control system An active noise control system is capable of canceling out noise in the passenger compartment of a vehicle based on low-frequency road noise. The active noise control system has a feed-forward control unit for being supplied with reference signals highly correlated ... | 06/13/2006 |
| 7059820 | Noise control Methods, devices, and/or systems for controlling vibration and/or acoustic noise. An exemplary method senses noise and/or, for example, rotational speed of a rotating shaft, determines control parameters and actuates one or more actuators. An exemplary device includ... | 06/13/2006 |
| 7053616 | MRI system having a gradient magnet system with a balance member The invention relates to a magnetic resonance imaging (MRI) system (1) comprising an examination volume (11), a main magnet system (13) for generating a main magnetic field (B0) in the examination volume in a Z-direction, a gradient m... | 05/30/2006 |
| 7020288 | Noise reduction apparatus An active noise control system includes a source unit for generating regenerative signals, an ANC unit for processing signals so as to actively cancel noise, sensors for detecting the information on the inside and outside of a vehicle, a vehicle interior voice discr... | 03/28/2006 |
| 7013832 | Arrangement for damping of structural resonance A hull (11) has mounted thereon a number of accelerometers (20) arranged to provide a data signal corresponding to movement or vibration of the hull (11) to which each is fixed. The hull (11) and/or a thrust block (18) has mounted ... | 03/21/2006 |
| 7010420 | Vibration controller for active vibration insulators and method for controlling vibrations for the same A vibration controller includes a data map storage, a detector, a determiner, a signal generator, and an actuator. The data map storage stores amplitude and/or phase data with respect to torque values of a vehicle engine as a data map in advance. The detector detect... | 03/07/2006 |
| 6999881 | Method and apparatus for detecting and locating noise sources whether correlated or not A method of detecting and locating noise sources each emitting respective signals Sj with j=1 to M, detection being provided by a sound wave or vibration sensors each delivering a respective time-varying electrical signal si with i in the range... | 02/14/2006 |
| 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 |
| 6958567 | Active/passive distributed absorber for vibration and sound radiation control The active/passive absorber for extended vibration and sound radiation control includes principally two layers. The first layer has a low stiffness per unit area which allows motion in the direction perpendicular to its main plane. The second layer is principally a ... | 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 |
| 6954666 | Method for local reduction of the operating noise produced by a medical diagnostic or therapy device, and medical diagnostic or therapy device having a device for implementing such a method In a method for local reduction of the operating noise produced by a medical diagnostic or therapy device, antisound is produced locally by a sound source. The sound source used is a highly directional parametric loudspeaker. As a result, disturbing operating noises... | 10/11/2005 |
| 6935206 | Vibration control by confinement of vibration energy A method of producing an optimized structure design incorporating vibration confinement is provided. The method includes providing structural specifications and vibration confinement specifications for the structure. The method includes selecting a confinement regio... | 08/30/2005 |
