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| Number | Title | Issue Date |
| 8059487 | Underwater detection device An underwater detection device includes a transceiver module for transmitting underwater an ultrasonic pulse signal that is frequency-modulated and receiving an echo signal corresponding to the transmitted signal, a pulse compression module for pulse-compressing the... | 11/15/2011 |
| 7372776 | Modal acoustic array transduction apparatus A transduction apparatus, which employs an array of individual transducers that generates multiple acoustic radiation modes, is described. These modes are used together to yield directional steered beam patterns. In one embodiment separate transducers, clustered in ... | 05/13/2008 |
| 7272073 | Method and device for generating information relating to the relative position of a set of at least three acoustic transducers The invention relates to a method and device for generating data about the mutual position of at least three acoustic transducers. The aim of the invention is to make it possible to continuously measure and calculate the mutual position of at least three acoustic tr... | 09/18/2007 |
| 7266043 | Method for directional location and locating system In order to locate electromagnetic or acoustic signal sources of a sensor configuration (1a through 1c) fitted with at least two electric outputs; where the incidence-dependent transfer functions between the acoustic signals incident on t... | 09/04/2007 |
| 7215826 | Rendering three-dimensional streak tube imaging lidar (STIL) data to two-dimensional contrast and range mappings thereof A rendering method converts three-dimensional streak tube imaging lidar (STIL) data to two-dimensional contrast and range maps thereof. A temporal portion of the STIL data is processed for each pixel of the three-dimensional image. Each temporal portion includes a G... | 05/08/2007 |
| 7212467 | Sonar localization Described herein is sonar localization apparatus which comprises a plurality of acoustic transducers (6) arranged to define at least two end fire arrays (2, 4) each of which produces a sonar beam (10, 12) suitable for the detection of objects in... | 05/01/2007 |
| 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 |
| 7025454 | Extended depth of field optics for human vision The present invention provides extended depth of field to human eyes by modifying contact lenses, intraocular implants, and/or the surface of the eye itself. This may be accomplished by applying selected phase variations to these optical elements (e.g., by varying s... | 04/11/2006 |
| 6930957 | Method for directional location and locating system In order to locate electromagnetic or acoustic signal sources of a sensor configuration (1a through 1c) fitted with at least two electric outputs; where the incidence-dependent transfer functions between the acoustic signals incident on t... | 08/16/2005 |
| 6861981 | Normalizing apparatus for adaptive beamforming in smart antenna receiving system Provided is a normalizing apparatus for adaptive beamforming by performing a normalizing process which uses a normalized least mean square (NLMS) algorithm that produces a weight vector for adaptive beamforming, in a smart antenna receiver. For the normalizing proce... | 03/01/2005 |
| 6559935 | Sensors of relative position and orientation An optical position and orientation determining system determines yaw, pitch, roll, lateral translation and longitudinal translation of a body with respect to a direction and intensity sensing receiver. The system comprises two energy beam emitters, mecha... | 05/06/2003 |
| 6370083 | Method and apparatus for detecting acoustic signals from a plurality of acoustic signal sensors An apparatus and method for detecting acoustic signals from a plurality of acoustic signal sensors. The apparatus comprises a plurality of acoustic signal detection channels. Each channel has an input for receiving acoustic signals from a corresponding ac... | 04/09/2002 |
| 6069585 | Personal direction finding apparatus A personal direction finding apparatus for determining the direction to be followed in order to reach a predetermined spot which includes a headset provided with two earphones and a circuit for generating a track error signal. The circuit includes a compa... | 05/30/2000 |
| 6002645 | Self survey of random arrays A method for determining the positions of the N array elements of a random rray to an accuracy sufficient to accomplish beam forming is provided where the initial positions of the array elements are known to an accuracy of λmin/2, and where λ | 12/14/1999 |
| 5729507 | Directional energy receiving systems for use in the indication of the direction of arrival of the received signal The bearing accuracy and long-range sonar target detection capability of a multi-cardioid directional receiving hydrophone array is improved by electronically producing mirror images of the cardioid directional patterns of each directional hydrophone in t... | 03/17/1998 |
| 5675655 | Sound input apparatus A sound input apparatus according to the present invention subtracts, from the output signal from a first microphone, the output signal of a second microphone which is arranged in a manner different from that of the first microphone to output the subtract... | 10/07/1997 |
| 5657393 | Beamed linear array microphone system A sound enhancement system including a beamed linear array microphone system for the acoustic pickup of voice and music from substantial distances with a relatively narrow sound pickup beam and with the avoidance of acoustic feedback. The acceptance beam ... | 08/12/1997 |
| 5625697 | Microphone selection process for use in a multiple microphone voice actuated switching system A microphone selection process is made relatively constant in terms of processing requirements through use of combination values which provide a measure of the quality of the speech signal received in each one of a plurality of microphones. Such combinati... | 04/29/1997 |
| 5581036 | Bandwidth sampling technique for digital focusing in array imaging systems The present invention-relates to an ultrasonic array imaging system for focusing ultrasonic signals which are reflected from an object to be imaged and received by an array transducer. A digital focusing method and system in accordance with the present in... | 12/03/1996 |
| 5581620 | Methods and apparatus for adaptive beamforming Methods and systems for beamforming are disclosed that include a signal processor that can dynamically determine the relative time delays between a plurality of frequency-dependent signals. The signal processor can adaptively generate a beam signal by ali... | 12/03/1996 |
| 5392213 | Filter for removal of coherent noise from seismic data A method for suppressing or removing coherent noise from seismic or borehole data is disclosed. The method requires horizontal alignment of the traces, comparison of the amplitude, phase and/or shape of neighboring traces, and subtraction of traces from n... | 02/21/1995 |
| 5333129 | Acoustic imaging in the ocean using ambinet noise An array of acoustic sensors is positioned near the object to be imaged so that an array of detection beams impinge upon the surface of the object. The ambient noise in the ocean which is generated by both natural and manmade phenomena is reflected off of... | 07/26/1994 |
| 5309409 | Target detection system An array of transducer elements receives energy from a target or targets in a field of view and operates on the transducer outputs to provide a plurality of different levels of shading. The most useful portion of the field pattern is selected and combined... | 05/03/1994 |
| 5272923 | Inspection apparatus An inspection apparatus utilizing a pulse compression technique is described which comprises a signal generator, a transmission/reception probe; first and second correlators and an adder. The signal generator generates a composite transmission signal cons... | 12/28/1993 |
| 5214709 | Hearing aid for persons with an impaired hearing faculty Hearing aid for persons with an impaired hearing faculty, including a directional microphone whose pick-up characteristic can be altered, the pick-up characteristic being automatically controlled as a function of the input or output signal in such a way t... | 05/25/1993 |
| 5208786 | Multi-channel signal separation A system separates unknown signals which have been combined together through unknown linear filters and for which observations at multiple sensors are made. In a two channel circuit with two inputs and two sensors, the reconstructed source signals are ass... | 05/04/1993 |
| 5043951 | Apparatus for reduction of side lobes in a beam pattern of an array A square law detection circuit for energy signals such as sonar signals wherein the signal processing eliminates the side lobe detection of false targets by eliminating the side lobes themselves without significant energy degradation of the main lobe of t... | 08/27/1991 |
| 5034931 | Display detection enhancement A system and method for enhancing detection of target signals in a passive detection system. The present invention enhances noise limited detection by combining energy from several frequencies, the fundamental and related harmonics. The present invention ... | 07/23/1991 |
| 5008630 | Stationary probability integrator system A stationary probability integrator system for facilitating spectral anals of detected signals by suppressing random frequency background noise, such as ocean disturbances and marine life, and by enhancing spectral signatures of discrete sound sources, s... | 04/16/1991 |
| 4977545 | Target detector A radiant energy detector having a pair of receiving transducers, a pair of ariable gain amplifiers connected to said transducers for amplifying the outputs thereof different amounts, a subtract circuit for producing a signal representing the difference of... | 12/11/1990 |
| 4965776 | Planar end-fire array A planar end-fire acoustic transducer array is composed of a planar matrix f individual elements. In order to give this array an end-fire characteristic, predetermined elements are provided with outputs which are phase-inverted with respect to the outputs ... | 10/23/1990 |
| 4772445 | System for determining DC drift and noise level using parity-space validation A system which measures direct current drift and noise in sensor signals from redundant sensors utilizing a parity-space algorithm. Parity vector signals produced by the parity-space algorithm are averaged to provide a direct current (DC) drift signal. An... | 09/20/1988 |
| 4703506 | Directional microphone apparatus A directional microphone apparatus includes an array of at least three sets of microphone units, circuits for processing the output signals from the microphone units to produce a first signal which varies in accordance with the second order bidirectional ... | 10/27/1987 |
| 4630246 | Seismic-acoustic low-flying aircraft detector The detection of low-flying aircraft is accomplished using both a microphone and geophone as sensors and a signal processing system for measuring the correlation between the seismic and acoustic signals. The signal processing system contains two amplifica... | 12/16/1986 |
| 4557386 | System to measure geometric and electromagnetic characteristics of objects A system to measure geometric and electromagnetic characteristics of objects. Wave energy of a single frequency (or very narrow band of frequencies) is directed upon an object which reflects (or otherwise interacts with) the wave energy. The reflected wav... | 12/10/1985 |
| 4433397 | Circuit arrangement for the formation and processing of group signals A circuit arrangement for forming a succession of group signals in the ranging art from received signals originating from an array of adjacent signal receiving transducers, each successive group signal being associated with a respective group characterist... | 02/21/1984 |
| 4414654 | Thinned array transducer for sonar The thinned arrayed transducer for a sonar system includes an array of sonar elements mounted in rows (layers) and columns (staves) on a structure, preferably cylindrical, to form a checkerboard pattern wherein the spacing between adjacent elements in the... | 11/08/1983 |
| 4360795 | Detection means An apparatus for determining the time of the closest point of approach of a taxiing aircraft comprising a microphone means for producing an input signal in response to the sound energy of a taxiing jet. A low pass filter is provided to receive the input s... | 11/23/1982 |
| 4336607 | Beamformer having random access memory delay A device for forming beams for mulitple elements of a hydrophone array. An nalog multiplexer receiver sequentially obtains one signal from each hydrophone and supplies input voltages to an analog to digital converter. Digital words from the converter are a... | 06/22/1982 |
| 4310904 | Ambient sea noise elimination method and apparatus An ambient sea noise elimination system is disclosed in which the outputs of a directional hydrophone and an omnidirectional hydrophone are filtered and summed such that the effective receiving pattern below approximately 300 Hz is a vertically oriented d... | 01/12/1982 |
