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| Number | Title | Issue Date |
| 7388810 | Ultrasonic distance measurement system A system for measuring distance in a gas or liquid operating medium has an even number of ultrasonic signal transmitters (12, 14), and a single ultrasonic signal receiver (16). The ultrasonic signal transmitters are adapted to transmit ultrasonic signa... | 06/17/2008 |
| 7319640 | Noise suppression system A method and apparatus is provided for suppressing noise which includes receiving a plurality of signals from an array of sensors and transforming each of these signals to the frequency domain. The transformed signals are beamformed so that noise sources can be iden... | 01/15/2008 |
| 7304912 | Scale adaptive filtering A scale adaptive filtering scheme is developed for underspread channels based on a model of the linear time varying channel operator as a process in scale. Recursions serve the purpose of adding detail to the filter estimate until a suitable measure of fidelity and ... | 12/04/2007 |
| 7255196 | Windshield and sound-barrier for seismic sensors A system and method for reducing acoustic, wind or other background noise that may interfere with sensing of a seismic signal is provided. More specifically, a shield is provided to enclose a geophone and thereby protect it from harmful noise. The shield may compris... | 08/14/2007 |
| 7245557 | Sonar A sonar emits an ultrasonic wave into the water from a transducer on the basis of a transmission signal outputted from a transmission circuit, receives an echo reflected in the water with the transducer and converts the echo into an electric signal, and displays und... | 07/17/2007 |
| 7164620 | Array device and mobile terminal From output of a microphone, a first circuit generates a signal having first directivity which passes, and a second circuit generates a signal having second directivity which conversely cuts off, a signal arriving from a direction of a target sound source to output ... | 01/16/2007 |
| 7164621 | Underwater sounding apparatus While keeping a propeller located in a negative direction of a y-axis turning, transmission of acoustic waves from vibrating elements of a transducer unit is interrupted. Reference signals “A” and “B” which are receiving beam signals having principal acousti... | 01/16/2007 |
| 7149149 | Acoustic flow noise cancellation using a reference hydrophone The present invention relates to a system and a method for substantially eliminating flow noise from the signal output of each hydrophone in a hull mounted acoustic array. The system comprises a plurality of hydrophones forming an acoustic array mounted to a hull of... | 12/12/2006 |
| 7038617 | Sensor doppler/wavelet processing A method according to an aspect of the invention is for filtering coherent multipulse radar, sonar or lidar returns. The method comprises the steps of separating the returns into mutually orthogonal I & Q components, performing wavelet processing on the I and Q comp... | 05/02/2006 |
| 7020044 | Apparatus for producing gaseous vapor baffle An apparatus that produces a gaseous vapor baffle that isolates an undersea sonar system from acoustic noise. The apparatus allows for craft carrying undersea sonar systems to travel at relatively high speeds while substantially isolating the undersea sonar systems ... | 03/28/2006 |
| 7004031 | Ultrasonic sensor An ultrasonic sensor includes a piezoelectric vibrator, a reverberation measuring device and a compensating device. The piezoelectric vibrator vibrates to transmit an ultrasonic wave, receives a reflected wave of the transmitted ultrasonic wave and produces an outpu... | 02/28/2006 |
| 6868044 | Data adaptive interference suppression A technique for suppressing interference with unknown phase shifts received by an array of sensor elements partitions the array into a plurality of subarrays. Each subarray is processed independently to suppress the interference. Next, the resulting data from each s... | 03/15/2005 |
| 6859420 | Systems and methods for adaptive wind noise rejection A system for rejecting wind noise at a plurality of sensors includes input logic, a processor and output logic. The input logic receives a signal from each of the plurality of sensors. The processor assigns a weight value to each of the received signals. The output ... | 02/22/2005 |
| 6822928 | Adaptive sonar signal processing method and system A method and system for processing received sonar signals. The method and system generate bearing data signals based on the received sonar signal. The method and system continuously determine the signal strength of the received sonar signal and also continuously det... | 11/23/2004 |
| 6744694 | Gaseous cavity for forward-looking sonar quieting A sonar quieting system for a forward-looking sonar array is provided. The sonar quieting system includes a cavitator for forming an envelope, a strut for supporting the cavitator to a marine platform, such as a ship, a forward-looking sonar array mounted to a forwa... | 06/01/2004 |
| 6704671 | System and method of identifying the onset of a sonic event The present invention provides for a method and system for identifying a sonic event of interest within a received audio signal. A sonic event is characterized by a predetermined rate of change in the perceived audio volume, and is associated with the lou... | 03/09/2004 |
| 6659232 | Method and device for position detection of an object along an acoustic-signal conductor The invention relates to the detection of the position of an object which can be moved along an acoustic-signal conductor of ferromagnetic material, in which an acoustic signal is incoupled in a clocked manner into the acoustic-signal conductor by means o... | 12/09/2003 |
| 6622647 | Active noise cancellation for a torpedo seeker head A noise cancellation system and method for use with a seeker head of a marine vessel are provided according to the invention. The seeker head employs one or more hydrophones that generate one or more output signals. The noise cancellation system includes ... | 09/23/2003 |
| 6615143 | Method and apparatus for reconstructing and acoustic field Acoustic field reconstruction is performed by expanding basis function which represent outgoing and incoming waves, without prior knowledge of the source geometry and dimensions. The reconstruction is based on acoustic pressures measured in the field only... | 09/02/2003 |
| 6590833 | Adaptive cross correlator A system and method are provided for an adaptive filter that is especially useful for sonar signal processing. The beam outputs of a conventional beamformer are provided as inputs to adaptive notch filters in accord with the present invention. The outputs... | 07/08/2003 |
| 6424596 | Method and apparatus for reducing noise from near ocean surface sources The present invention is directed to a method and system for significantly reducing the acoustic noise from near-surface sources using an array processing technique that utilizes Multiple Signal Classification (MUSIC) beamforming and the Lloyd's Mirror in... | 07/23/2002 |
| 6418083 | Phase fluctuation based signal processor A method for characterizing degree of phase fluctuation of a signal and a signal processor for accomplishing such characterization, is described, in which a time series of complex data vectors are received, initial spectral processing is accomplished, an ... | 07/09/2002 |
| 6356510 | Phase fluctuation enhanced adaptive processor A novel method and apparatus for signal processing are described which discriminate between signals and noise based on the magnitude of the phase fluctuations. In an embodiment of the invention, the governing equations of the process adaptively change in ... | 03/12/2002 |
| 6262943 | Signal processing system for sensing a periodic signal in noise A method and an apparatus for distinguishing systematic artifacts from noise involves localizing functional noise in the vicinity of predicted functional peaks. The method is particularly relevant to detection and tracking of time-varying signals. An appa... | 07/17/2001 |
| 6128249 | Method of operating a continuous wave sonar system An improved method is provided for operating a continuous wave sonar syst At time of transmission, a plurality of acoustic pulses are transmitted one right after another. Each pulse has a unique frequency and is of a time duration that is approximately o... | 10/03/2000 |
| 6097669 | Wavelet filtering of sodar signals A method for determining Doppler shifts and reflectivity data based on wavelet based sodars. Initially, a high powered sodar pulse of sound is transmitted from an antenna into the atmosphere. This pulse of sound consists of a string of concatenated wavele... | 08/01/2000 |
| 6036351 | Advanced signal processing filter A filter, and method of the filtering, for increasing the signal to noise tio of relatively small and constant amplitude signals in the presence of relatively large and varying amplitude signals. The filter produces a filtered power level az pr... | 03/14/2000 |
| 5886951 | Method for enhancing signal-to-noise ratio and resolution of amplitude stable signals A method for enhancing signal-to-noise ratio and resolution of amplitude stable signals wherein underwater acoustic data is first collected with an array of hydrophones, and then the data is digitally sampled. After producing spectra of sequential time sn... | 03/23/1999 |
| 5822276 | Broadband sonar method and apparatus for use with conventional sonar sensor arrays A broadband sonar system is configured to be coupled to a narrow band sonar sensor array having a plurality of sensor groups configured in subarrays. Each of the sensor groups within a subarray is spaced equidistantly from adjacent sensor groups within th... | 10/13/1998 |
| 5808243 | Multistage turbulence shield for microphones An acoustic sensing means such as a microphone or a thin-film sensor is located in a flowing medium. To prevent the sensing of flow generated noise, the sensing means is separated from the flowing medium by at least three stages of shielding. In a preferr... | 09/15/1998 |
| 5781508 | Optimizing the compressional wave energy response of an elastic fluid-filled cylinder A method and system are provided to optimize filtering of compressional wave energy in the wavenumber domain for a given frequency range using a fluid-filled elastic cylinder. The fluid is selected based on its fluid density .rho.i and dilatati... | 07/14/1998 |
| 5781460 | System and method for chaotic signal identification A chaotic signal processing system receives an input signal provided by a nsor in a chaotic environment and performs a processing operation in connection therewith to provide an output useful in identifying one of a plurality of chaotic processes in the c... | 07/14/1998 |
| 5757721 | Inverse method to measure the breathing wave speed in a liquid-filled cylindrical shell Disclosed is an inverse method for measuring the breathing wave speed in a iquid-filled cylindrical shell. The model used with this method is based on an experimental configuration where a shell is attached to a mechanical shaker at the forward end, which ... | 05/26/1998 |
| 5732045 | Fluctuations based digital signal processor including phase variations A scheme for filtering noise from a signal, in which the noise fluctuates significantly in phase. The signal is sampled to produce N members of a time series and the phase of each signal extracted in the form of a magnitude and a phaser, i.e. for a time s... | 03/24/1998 |
| 5717657 | Acoustical cavitation suppressor for flow fields A cavitation suppressor using acoustic energy to suppress flow field caviion is provided. The suppressor system has a plurality of pressure transducers located along the outer surface of a sonar dome. These transducers are powered through a controller wh... | 02/10/1998 |
| 5712805 | Noise diagnostic system A method for reconstructing the acoustic field on the surface of a vibrating object based on measurements of the radiated acoustic pressure includes solving the Helmholtz equation directly using the expansion of a set of independent functions that are gen... | 01/27/1998 |
| 5705985 | Structure-borne sound detector for break-in surveillance A structure-bone sound detector suppresses unwanted signals in a frequency range to be monitored, to enhance the immunity of the detector to false alarms. The output signal from a sound sensor undergoes preprocessing, and is then fed to a pair of comb fil... | 01/06/1998 |
| 5696489 | Wireless boundary monitor system and method A wireless boundary monitor system used to monitor the integrity of a boundary surrounding an area uses at least two housings having at least one transmitting means for emitting ultrasonic pressure waves to a medium. Each of the housings has a plurality o... | 12/09/1997 |
| 5680393 | Method and device for suppressing background noise in a voice signal and corresponding system with echo cancellation The invention provides a method of suppressing a background noise signal in a sampled noisy voice signal. The method comprises the following steps: digital frequency-domain processing of the noisy voice signal to produce time-domain filtering coefficients... | 10/21/1997 |
| 5652425 | Photoelectric conversion module with noise compensation It is an object of present invention to provide a low-cost photoelectric conversion module in which a signal for compensating noise caused by changes in temperature and variations in power supply is obtained. In the photoelectric conversion module accordi... | 07/29/1997 |
