Receiver Circuitry Patents (Class 367/135)
  • Patent number: 7679998
    Abstract: A system applicable to acoustic, seismic, electromagnetic, hydrodynamic, and shock waves utilizing a map between signal time series and signal vectors defining the mathematical wave field model characterizing the signal's wave field. This map is developed from wave models relating field values to those on surfaces and corresponding uniqueness theorems. The system should allow for improved resolving power in bearing and elevation for discrimination of sources; detection and direction finding for signals below the average background level; detection based upon resolving power and signal vector characteristics rather than signal to noise ratio; reconstruction of signals of resolved sources for their transmitted information content; and multiple modes of operation. Adaptive incorporation of known undesired signals into the noise background and/or treatment of asymmetric background noise fields is permitted through use of a noise metric-based map yielding signal direction in the presence of diffraction effects.
    Type: Grant
    Filed: June 27, 2008
    Date of Patent: March 16, 2010
    Inventor: Charles A. Uzes
  • Publication number: 20100062683
    Abstract: A method of and system for using sounds produced by bees flying near a beehive entrance enable a beekeeper to assess the operational productivity of the beehive. In a preferred embodiment, the method entails positioning an acoustic pickup device, such as a microphone, at a location to pick up and provide an audio signal representing sounds produced by bees flying around the beehive entrance. The flying bees produce the sounds either while hovering in the vicinity of the beehive or while launching from locations around the beehive entrance to forage for pollen and nectar. The audio signal is analyzed to distinguish the sound of launching flying bees from the sound of ambient background noise.
    Type: Application
    Filed: September 3, 2009
    Publication date: March 11, 2010
    Inventor: Trenton J. Brundage
  • Patent number: 7656750
    Abstract: An echo detection circuit that detects an echo by detecting the magnitude of a digitally mixed representation of the received acoustic signal and reference sine and cosine signals. That magnitude is then compared against an echo threshold to verify the presence or absence of an echo signal. A low pass filter with a configurable cut-off frequency may be used to define the selectivity of the echo detector.
    Type: Grant
    Filed: February 26, 2008
    Date of Patent: February 2, 2010
    Assignee: Semiconductor Components Industries, LLC
    Inventor: Ivan Koudar
  • Patent number: 7650208
    Abstract: A diver unit computes the direction and distance to a specified target. When the target is obstructed, the diver unit receives navigation assistance data from another diver unit. The navigation assistance data includes direction information that is referenced to a common reference line extending between the two diver units.
    Type: Grant
    Filed: September 18, 2007
    Date of Patent: January 19, 2010
    Assignee: Estate of Albert R. Basilico
    Inventor: Albert R. Basilico
  • Patent number: 7646676
    Abstract: Sampling of a captured signal is synchronized to a tonal which may be unstable in frequency detected in the signal to cause it and all of its harmonics, sub-harmonics and fundamental to appear to have a substantially constant frequency relative to the sampling rate even if some related signals are otherwise undetectable amid noise. By adjusting an integration period of a fast Fourier transform to extract an intrinsic bandwidth, substantial signal processing gain can be obtained for the tonal and harmonically related signals, even if otherwise undetectable. Signal processing may be performed in either the time domain or the frequency domain. Recursive processing is performed to observe unrelated tones by grouping of tones which are harmonically related and supports detection of relationships between acoustic signal sources.
    Type: Grant
    Filed: July 3, 2007
    Date of Patent: January 12, 2010
    Assignee: Lockheed Martin Corporation
    Inventor: Robert J. Howard
  • Patent number: 7643377
    Abstract: A system applicable to acoustic, seismic, electromagnetic, hydrodynamic, and shock waves utilizing a map between signal time series and signal vectors defining the mathematical wave field model characterizing the signal's wave field. This map is developed from wave models relating field values to those on surfaces and corresponding uniqueness theorems. The system should allow for improved resolving power in bearing and elevation for discrimination of sources; detection and direction finding for signals below the average background level; detection based upon resolving power and signal vector characteristics rather than signal to noise ratio; reconstruction of signals of resolved sources for their transmitted information content; and multiple modes of operation. Adaptive incorporation of known undesired signals into the noise background and/or treatment of asymmetric background noise fields is permitted through use of a noise metric-based map yielding signal direction in the presence of diffraction effects.
    Type: Grant
    Filed: June 27, 2008
    Date of Patent: January 5, 2010
    Inventor: Charles A. Uzes
  • Publication number: 20090268555
    Abstract: A computer implemented method and apparatus for identifying component breakdown of noise sources. Noise data is received for a noise source from an array of sound sensors. Measurement points of interest, candidate sound source points along an axis, and array aperture angles are identified. Sets of first and second bounding traces are identified from ray traces extending from the candidate noise source points towards the measurement points of interest using the array aperture angles. The bounding ray traces are rotated around the axis to form sets of first and second surfaces. Sets of first and second curves are identified from an intersection of the sets of first and second surfaces with the ground plane. Sound sensors are selected from the array using the curves to form subarrays. The component breakdown of noise generated by the noise source is identified using noise data from sound sensors in the subarrays.
    Type: Application
    Filed: April 25, 2008
    Publication date: October 29, 2009
    Inventors: James Robert Underbrink, Leon Brusniak
  • Patent number: 7604596
    Abstract: A hand held ultrasonic instrument is provided in a portable unit which performs both B mode and Doppler imaging. The instrument includes a transducer array mounted in a hand-held enclosure, with an integrated circuit transceiver connected to the elements of the array for the reception of echo signals. A digital signal processing circuit performs both B mode and Doppler signal processing such as filtering, detection and Doppler estimation, as well as advanced functions such as assembly of multiple zone focused scanlines, synthetic aperture formation, depth dependent filtering, speckle reduction, flash suppression, and frame averaging.
    Type: Grant
    Filed: December 24, 2003
    Date of Patent: October 20, 2009
    Assignee: SonoSite, Inc.
    Inventors: Juin- Jet Hwang, Geoffrey H. Jones, Terrance R. Doherty, Lauren S. Pflugrath
  • Publication number: 20090257315
    Abstract: Disclosed are a position tracing signal generator unit and an input system using the same. The position tracing signal generator unit of the present invention generates ultrasonic signals with a constant time interval to allow ultrasonic signals generated from a plurality of ultrasonic signal generator to be overlapped and amplified. It is possible to increase the intensity of the ultrasonic signal and lengthen the range. Due to the structural advantages of the present invention as described above, it is possible to solve a problem of the prior art, i.e., a large thickness of the position tracing signal generator unit caused by a large size of the ultrasonic sensor for increasing the intensity of the ultrasonic signal.
    Type: Application
    Filed: April 10, 2008
    Publication date: October 15, 2009
    Applicant: PENANDFREE CO., LTD.
    Inventors: Do-Young Ko, Jae-Jun Lee
  • Publication number: 20090245026
    Abstract: A system for generating a threat alert in an infrastructure component is provided. The system includes multiple acoustic sensors disposed in a protected zone around the infrastructure component, wherein each of the sensors is configured to detect a signal corresponding to an outcome that causes damage to the infrastructure component. The system also includes a processing circuitry coupled to each of the multiple acoustic sensors. The processing circuitry includes at least one analog-to-digital converter configured to digitize the signal. The processing circuitry also includes a digital signal processor configured to process the acoustic signal in a sequential routine. The sequential routine includes a noise filtering routine configured to filter background noise from the acoustic signal and generate a filtered signal. The sequential routine also includes a source identification routine configured to identify a source generating the acoustic signal based upon the filtered signal.
    Type: Application
    Filed: March 25, 2008
    Publication date: October 1, 2009
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Corey Nicholas Bufi, Sahika Genc
  • Patent number: 7586813
    Abstract: To reduce signal interference and improve the signal-to-noise ratio in the transmitted signal, the analog signals produced by an ultrasound transducer are promptly digitized. In accordance with the invention, the demodulator is already shielded from the ultrasound transducers, immediately after the preamplifier, which is itself shielded from the ultrasound transducers, by an analog to digital converter, for example.
    Type: Grant
    Filed: July 25, 2005
    Date of Patent: September 8, 2009
    Assignee: Betriebsforschunginstitut VDEH-Institut für Angewandte Forschung GmbH
    Inventors: Dietmar Oberhoff, Guido Flohr, Günther Coen
  • Patent number: 7583562
    Abstract: The transducer circuit includes a transducer component, a drive circuit for the transducer component, a control port for coupling the drive circuit to a control unit and a modulator. The modulator has an input port for receiving a signal or data from another device. The modulator has an output which is coupled to an output stage in the drive circuit. The modulator operates to transmit data, received at the input port, through the drive circuit and the control port to a control unit.
    Type: Grant
    Filed: November 14, 2006
    Date of Patent: September 1, 2009
    Assignee: Siemens Milltronics Process Instruments, Inc.
    Inventor: George Quinton Lyon
  • Publication number: 20090196129
    Abstract: An atmospheric pressure measuring apparatus allows a transmitter to transmit an acoustic wave for measurement of the atmospheric pressure. Air propagates the acoustic wave. A receiver receives the acoustic wave. Since the intensity of the acoustic wave changes to follow the variation of the atmospheric pressure, the atmospheric pressure can be measured based on the intensity of the acoustic wave received at the receiver. The atmospheric pressure is in this manner measured with such a simplified structure.
    Type: Application
    Filed: January 30, 2009
    Publication date: August 6, 2009
    Applicant: FUJITSU LIMITED
    Inventors: Yoshitaka Suzuki, Takahiro Imamura
  • Publication number: 20090028004
    Abstract: A system (200) for monitoring a person (116), in particular a baby, is disclosed. The system (200) comprises a sound capturing unit (202) and a sound rendering unit (120). The sound capturing unit (202) comprises: sound converting means (104) for converting a first sound into a first signal (S1(t)); receiving means (106) for receiving a second signal (S2(t)) corresponding to a second sound being audible in a neighborhood of the sound capturing unit (202); extracting means (108) for extracting a third signal (S3(t)) on basis of the first signal (S1(t)) and the second signal (S2(t)); and transmitting means (110) for transmitting the third signal (S3(t)). The sound rendering unit (120) comprises: receiving means (122) for receiving the third signal (S3(t)); and sound generation means (124) for generating a third sound on basis of the third signal (S3(t)).
    Type: Application
    Filed: October 10, 2005
    Publication date: January 29, 2009
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.
    Inventor: Petr Kourzanov
  • Publication number: 20080316863
    Abstract: Directional microphone or microphones for position determination. One or multiple directional microphones are implemented in various locations to perform acoustic wave capture of acoustic waves associated with object (e.g., a player, a gaming object, a game controller, etc.). The generator of such acoustic waves may be co-located with the object (e.g., integrated into the object if the object is a device such as a gaming object, a game controller, etc., or integrated into clothing worn by a player such as on a hat, a jacket, etc.). The acoustic waves described herein may be generated by any number of means/devices including audio output devices, speakers, pulse wave generators, audio oscillators, etc. Moreover, such acoustic waves may be ultrasonic. A game module and/or processing module processes directional vectors associated with positions of the directional microphones when detecting relative maximum amplitude of an acoustic wave emits by an acoustic wave generator.
    Type: Application
    Filed: June 9, 2008
    Publication date: December 25, 2008
    Applicant: BROADCOM CORPORATION
    Inventors: John Walley, Ahmadreza (Reza) Rofougaran
  • Publication number: 20080310256
    Abstract: An acoustic sensing device includes a housing having an internal cavity filled with a vibration decoupling medium. An acoustic window formed of an acoustically transparent material is mounted in the housing. This mounting can be by antivibration mounts to prevent housing noise from affecting the acoustic window. A scanning laser vibrometer is positioned within the housing and directed to detect vibrations of the acoustic window. Antivibration mounts are joined between said scanning laser vibrometer and said housing. In further embodiments, the scanning laser vibrometer detects vibrations at a plurality of locations on the acoustic window forming a virtual array.
    Type: Application
    Filed: June 12, 2007
    Publication date: December 18, 2008
    Inventors: Benjamin A. Cray, Walter H. Boober, Stephen E. Forsythe, Lee E. Estes, Andrew J. Hull
  • Patent number: 7433267
    Abstract: A circuit with two terminals that receive an input current. The circuit includes a sensor, and a controller to generate a modulated signal. The circuit also includes a flyback circuit that receives the modulated signal. The flyback circuit generates a first output voltage based on the modulated signal, shunts or redistributes at least a portion of the input current, and enables the controller to regulate the input current in proportion to the modulated signal.
    Type: Grant
    Filed: December 13, 2004
    Date of Patent: October 7, 2008
    Assignee: SSI Technologies, Inc.
    Inventors: Gregory P. Murphy, Lawrence B. Reimer
  • Patent number: 7423934
    Abstract: A system applicable to acoustic, seismic, electromagnetic, hydrodynamic, and shock waves utilizing a map between signal time series and signal vectors defining the mathematical wave field model characterizing the signal's wave field. This map is developed from wave models relating field values to those on surfaces and corresponding uniqueness theorems. The system should allow for improved resolving power in bearing and elevation for discrimination of sources; detection and direction finding for signals below the average background level; detection based upon resolving power and signal vector characteristics rather than signal to noise ratio; reconstruction of signals of resolved sources for their transmitted information content; and multiple modes of operation. Adaptive incorporation of known undesired signals into the noise background and/or treatment of asymmetric background noise fields is permitted through use of a noise metric-based map yielding signal direction in the presence of diffraction effects.
    Type: Grant
    Filed: November 9, 2006
    Date of Patent: September 9, 2008
    Inventor: Charles A. Uzes
  • Patent number: 7411866
    Abstract: The present invention relates to a user interface system that is acoustically operated for the control of connected devices. Through the interface, acoustic sounds, such as tap, can be distinguished from less than 10 cm apart.
    Type: Grant
    Filed: September 17, 2007
    Date of Patent: August 12, 2008
    Assignee: The Hong Kong Polytechnic University
    Inventors: Catherine Ka Gee Hu, Kinsun Kin Sun Tung, Lawrence Ming Tat Lau
  • Patent number: 7372774
    Abstract: A system applicable to acoustic, seismic, electromagnetic, hydrodynamic, and shock waves utilizing a map between signal time series and signal vectors defining the mathematical wave field model characterizing the signal's wave field. This map is developed from wave models relating field values to those on surfaces and corresponding uniqueness theorems. The system should allow for improved resolving power in bearing and elevation for discrimination of sources; detection and direction finding for signals below the average background level; detection based upon resolving power and signal vector characteristics rather than signal to noise ratio; reconstruction of signals of resolved sources for their transmitted information content; and multiple modes of operation. Adaptive incorporation of known undesired signals into the noise background and/or treatment of asymmetric background noise fields is permitted through use of a noise metric-based map yielding signal direction in the presence of diffraction effects.
    Type: Grant
    Filed: October 12, 2006
    Date of Patent: May 13, 2008
    Inventor: Charles A. Uzes
  • Publication number: 20080106403
    Abstract: Certain embodiments of the present invention provide a system for improved signal processing within a remote sensor system. The system includes a detection component and a processing component. The detection component is adapted to detect an event and generate a signal based at least in part on the event. The processing component adapted to process a signal based at least in part on a situation. Certain embodiments of the present invention provide a method for improved signal processing within a remote sensor system. The method includes determining a situation, detecting an event, generating a signal based at least in part on the event, and processing the signal based at least in part on the situational parameter.
    Type: Application
    Filed: November 7, 2006
    Publication date: May 8, 2008
    Inventors: Paul Edward Voglewede, Scott J. Cloutier, Michael D. Jordan
  • Patent number: 7366057
    Abstract: An arrangement for signal processing in ultrasonic transducers in flow meters has an ultrasonic transducer acted upon by a drive signal with the ultrasonic transducer being connected to a resonant circuit matched to the frequency of the drive signal. The resonant circuit can be a component of the network which makes switching over the ultrasonic transducer for transmitting operation to a receiving operation possible. An ultrasonic flow meter uses time-of-flight principle for transmitting and receiving ultrasonic signals and signal post-processing of the received ultrasonic signals. To make available an ultrasonic flow meter that produces an improved quality voltage signal for evaluation and at the same time makes possible a reduction of its production costs, a ringing circuit is provided. The ringing circuit may be a series ringing circuit for signal post-processing of the received ultrasonic signals connected to a comparator and using an LC-circuit, a Pi-filter or an RLC-circuit.
    Type: Grant
    Filed: October 24, 2006
    Date of Patent: April 29, 2008
    Assignee: Hydrometer GmbH
    Inventors: Ulrich Gaugler, Horst Ziegler, Horst Behlen
  • Patent number: 7348894
    Abstract: A data telemetry system for multi-conductor wirelines to enhance transmission of analog and digital signals with frequency content up to 100 kHz by assigning at least two conductors to a first terminal of a data transmittal means and to a first terminal of a data receiver means and connecting at least one additional conductor to a second terminal of a data transmittal means and to a second terminal of a data receiver means. Pairing conductors reduces attenuation and crosstalk and permits the signal to contain multiple frequency modulated carrier bands with individual channel bandwidths of up to 3 kHz or higher.
    Type: Grant
    Filed: July 21, 2005
    Date of Patent: March 25, 2008
    Assignee: Exxon Mobil Upstream Research Company
    Inventors: Jeffrey R. Bailey, Marion M. Ringo
  • Patent number: 7304912
    Abstract: 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 complexity is achieved.
    Type: Grant
    Filed: February 1, 2006
    Date of Patent: December 4, 2007
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Paul John Gendron
  • Patent number: 7123548
    Abstract: A system applicable to acoustic, seismic, electromagnetic, hydrodynamic, and shock waves utilizing a map between signal time series and signal vectors defining the mathematical wave field model characterizing the signal's wave field. This map is developed from wave models relating field values to those on surfaces and corresponding uniqueness theorems. The system should allow for improved resolving power in bearing and elevation for discrimination of sources; detection and direction finding for signals below the average background level; detection based upon resolving power and signal vector characteristics rather than signal to noise ratio; reconstruction of signals of resolved sources for their transmitted information content; and multiple modes of operation. Adaptive incorporation of known undesired signals into the noise background and/or treatment of asymmetric background noise fields is permitted through use of a noise metric-based map yielding signal direction in the presence of diffraction effects.
    Type: Grant
    Filed: August 9, 2005
    Date of Patent: October 17, 2006
    Inventor: Charles A. Uzes
  • Patent number: 7064662
    Abstract: A device for locating an object, which includes a master transmitter with at least one servant receiver. A signal from the master transmitter unit activates the servant receiver unit, which then turns itself on. The servant receiver unit has both sound and light output to attract the attention of a user. The servant receiver unit is placed on an object like luggage, a remote control, a personal data assistant, or the like. When the user has misplaced the valuable object, the master transmitter unit is used to activate the servant unit whose light and sound makes it possible to locate the lost object. Because the servant receiver unit is not turned on until it receives the signal from the master transmitter unit, it draws negligible current from a battery. This means that batteries need not be replaced in the servant receiver unit whose effective life will be close to the shelf life of the batteries.
    Type: Grant
    Filed: December 11, 2002
    Date of Patent: June 20, 2006
    Assignee: Oils Wells, Inc.
    Inventor: Christopher M. Goggin
  • Patent number: 7064664
    Abstract: The present invention involves a system and method for detecting a graffiti-making act such as the spray of a spray paint can, the writing with a felt-marker pen on a surface, and the scratching with an abrasive instrument on a surface. The system includes one or more sensors adapted to sense the graffiti-making act and transmit a signal representative of the graffiti-making act, and a base unit including electronics adapted to process the signal and determined whether the signal represents a graffiti-making act, and a communication device coupled to the electronics and adapted to communicate to one or more entities that a graffiti-making act has been detected. The method includes sonically detecting the graffiti-making act, and initiating an alarm indicating that the graffiti-making act took place.
    Type: Grant
    Filed: July 24, 2003
    Date of Patent: June 20, 2006
    Assignee: Traptec Corporation
    Inventors: George H. Lerg, Arthur J. Devine, Donald L. Roberts, Randy E. Johnson
  • Patent number: 7012854
    Abstract: A plurality of sensors and a digital adaptive tuning filter bank are used in extracting a desired emitted signal embedded in a noisy environment. By monitoring noise statistics of the sensor signals, the digital adaptive tuning filter bank automatically adjusts its upper (to eliminate strong tonals) and lower (to eliminate background noise) thresholds to obtain a discovery frequency band. The filter bank is designed by examining the discovery band across the sensors and over a predefined period of time. The method described significantly reduces the possibilities of matching self-noise transients (unwanted signals) and thus minimizes the false alarm rate in emitted signal recognition.
    Type: Grant
    Filed: June 21, 1990
    Date of Patent: March 14, 2006
    Assignee: Honeywell International Inc.
    Inventor: Pei-hwa Lo
  • Patent number: 6870794
    Abstract: A transducer and electrical cable combination for use, preferably, in a trolling motor. The electrical cable includes an outer shield connected to the chassis ground of the trolling motor; an inner shield connected to the signal ground of the transducer; and a pair of signal carrying conductors comprising a twisted pair.
    Type: Grant
    Filed: April 1, 2003
    Date of Patent: March 22, 2005
    Assignee: Brunswick Corporation
    Inventor: Robert W. Healey
  • Patent number: 6845062
    Abstract: A system (100) and method for identifying a presence of a creature (140) disposed in water (135). This system includes a transducer (105) for receiving at least one vibrational wave and generating at least one transformed signal responsive to the vibrational wave. The system also includes a signal processor (110) for processing the transformed signal to indicate a presence of a particular type of creature which is disposed in water. The system can be included with a buoy, a mooring, an underwater structure and/or a watercraft.
    Type: Grant
    Filed: October 14, 2003
    Date of Patent: January 18, 2005
    Assignee: University of Florida Reasearch Foundation, Inc.
    Inventors: Christopher Niezrecki, Richard Lee Phillips, Michael Meyer, Deidrich Beusse
  • Publication number: 20040090867
    Abstract: A focal point reflector is used in conjunction with a dual heterodyne circuit to reduce reception nulls that can occur when performing ultrasonic measurements. The focal plane reflector is a flat non-porous or reflective material, such as printed circuit board (PCB) that is placed behind and in parallel with an ultrasonic array of piezoelectric transducers. In accordance with the invention, the addition of the focal point reflector to the array of piezoelectric array permits the reflection of ultrasonic energy that may “fall” between the crystals in the array and then back into the crystal elements.
    Type: Application
    Filed: March 11, 2003
    Publication date: May 13, 2004
    Inventors: Mark A. Goodman, William Bishop
  • Publication number: 20040090866
    Abstract: A system and method for eliminating confusion associated with checking valves, wherein additional test points are added to the measurement of a valve for ensuring the verification of the actual sources of leaks or turbulence. A base line measurement for the valve is established by measuring the level of ultrasonic sound at the two points upstream from the valve. The level of the ultrasound at two downstream points is then measured. The value of the ultrasound at the downstream test points is compared to the values of the ultrasound at the upstream test points. If the values of ultrasound at the downstream test points are higher than the values of the ultrasound at the upstream test points, then the valve is leaking. If the values of the ultrasound at the downstream test points are close to or lower than the values of the ultrasound at the upstream test points, then the valve is not leaking, i.e., the valve is good.
    Type: Application
    Filed: March 11, 2003
    Publication date: May 13, 2004
    Inventors: Mark A. Goodman, William Bishop
  • Patent number: 6717983
    Abstract: An ultrasonic coding modem for digital network communication comprises a transmitting device having a first piezoelectric substrate, and a receiving device having a second piezoelectric substrate. If a message digital-signal is applied to the transmitting device, a SAW is excited on the first piezoelectric substrate and is delivered as a coded digital signal into a digital network. On the other hand, if the coded digital-signal is received at the receiving device from the digital network, a SAW is excited on the second piezoelectric substrate. In this time, if the SAW excited on the second piezoelectric substrate is corresponding to the SAW excited on the first piezoelectric substrate, an output digital-signal, which is equivalent to the message digital-signal, is delivered from the receiving device. As a result, it is possible to keep a base-band communication secret.
    Type: Grant
    Filed: September 19, 2000
    Date of Patent: April 6, 2004
    Inventor: Kohji Toda
  • Patent number: 6707762
    Abstract: A method and apparatus for detecting leaks and mechanical faults by way of an ultrasonic device. An output from a variable gain amplifier is supplied to a pair of heterodyning circuits, i.e., a dual heterodyning circuit. At each respective heterodyning circuit, the output signal from the variable gain amplifier is multiplied by a local oscillator that is internal to each circuit. The dual heterodyning circuit is used to provide an enhanced input transducer signal for spectral analysis. This permits the capture of low level frequency components for extraction during spectral analysis. The dual heterodyning circuit of the present invention to provide the enhanced spectrum to thereby permit an easy determination of whether the resonance is mechanical or electrical becomes clear. In addition, fault frequencies are also more easily discernable. In other words, the enhanced signal output provides a lower signal to noise ratio such that the ease with which frequency components are analyzed is increased.
    Type: Grant
    Filed: November 12, 2002
    Date of Patent: March 16, 2004
    Assignee: U-E Systems, Inc.
    Inventors: Mark A. Goodman, William Bishop
  • Patent number: 6667709
    Abstract: A method and apparatus for detecting and locating leaks in buried pipes is disclosed in which ground penetrating radar, induction, acoustic, and vacuum excavation systems are selected based on soil conditions and then employed in selected combinations. The conductivity and wave speed of the soil are used in the selection process and in the process of detecting and locating a leak based on the measurements obtained from the selected combination of detection systems.
    Type: Grant
    Filed: January 14, 2003
    Date of Patent: December 23, 2003
    Assignee: Witten Technologies Inc.
    Inventors: Thorkild Hansen, Michael L. Oristaglio
  • Patent number: 6629063
    Abstract: An acoustic signal processor that samples acoustic data, performs a spectrum analysis of the sampled acoustic data, stores the acoustic data in corresponding frequency bins, and then filters acoustic data stored in a frequency bin by applying a power-law arithmetic operation to the frequency bin acoustic data, such that the power-law arithmetic operation is adaptively changed based on an order dependent determination of whether the frequency bin acoustic data is representative of noise or clutter, or whether it is representative of a signal of an object.
    Type: Grant
    Filed: July 30, 2001
    Date of Patent: September 30, 2003
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Ronald A. Wagstaff, Jackson A. Mobbs
  • Patent number: 6608798
    Abstract: A transmit-receive (T-R) switch for achieving fast T-R switching times while ensuring that the signal strength of a received signal is not fully coupled. A differential amplifier and an inverting amplifier, both having a coupling resistor as an input is used so that nearly all of the input signal is sensed by an operational amplifier. This technique improves transducer voltage transfer (coupling) ratio from 15-24% to about 100%. The T-R switch architecture is preferably to short-range, single-transducer acoustic ranging systems.
    Type: Grant
    Filed: November 21, 2001
    Date of Patent: August 19, 2003
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Michael T. McCord
  • Patent number: 6597634
    Abstract: A signal processing system provides and processes a digital signal, converted from to an analog signal, which includes a noise component and possibly also an information component comprising small samples representing four mutually orthogonal items of measurement information representable as a sample point in a symbolic Cartesian four-dimensional spatial reference system. An information processing sub-system receives said digital signal and processes it to extract the information component. A noise likelihood determination sub-system receives the digital signal and generates a random noise assessment of whether or not the digital signal comprises solely random noise, and if not, generates an assessment of degree-of-randomness. The information processing system is illustrated as combat control equipment for undersea warfare, which utilizes a sonar signal produced by a towed linear transducer array, and whose mode operation employs four mutually orthogonal items of measurement information.
    Type: Grant
    Filed: August 22, 2001
    Date of Patent: July 22, 2003
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Francis J. O'Brien, Jr., Chung T. Nguyen
  • Patent number: 6594201
    Abstract: A system and process for localizing signals received on multiple co-linear arrays reduces the adverse effects on localization performance due to background noise. The system and process coherently combine all possible array cross-correlograms. The resulting correlogram is a function of two variables, one which corresponds to a fine bearing estimate and a second with maps into range.
    Type: Grant
    Filed: October 23, 2001
    Date of Patent: July 15, 2003
    Assignee: Lockheed Martin Corporation
    Inventors: Thomas J. Barnard, Donald W Winfield
  • Patent number: 6545945
    Abstract: The present invention provides signification improvements over the apparatus and method disclosed by U.S. Pat. No. 4,922,467. The invention provides an apparatus for material classification and substance identification of an object contained within an enclosure, or buried beneath the ground. The improvements to the present invention include the use of a source of either electromagnetic or acoustic energy, and electromagnetic or acoustic energy receivers, as appropriate. In addition, the present invention discloses the use of energy pulses of differing frequencies, such that the signal processor can compute the rate of change of energy absorption of the substance, as a function of frequency (d&agr;/df). In this way, the apparatus permits the formulation of a highly detailed and accurate object signature, which can be compared with a database of known object signatures for exact substance identification.
    Type: Grant
    Filed: February 26, 2001
    Date of Patent: April 8, 2003
    Assignee: Ocean Data Equipment Corporation
    Inventor: David D. Caulfield
  • Patent number: 6545946
    Abstract: For use with a high gain receiver circuit which receives echo pulses of frequencies within a predetermined bandwidth and at times within interpulse periods of a predetermined pulse repetition rate and amplifies the echo pulses for measurement purposes, the receiver circuit susceptible to electrical noise within the frequency bandwidth of the received echo pulses to create false echo pulses, a method of eliminating substantially the false echo pulses without affecting substantially the amplified echo pulses by accepting only echo pulses which occur synchronously among interpulse periods. The pulse repetition rate may be varied to eliminate false echo pulses that are synchronous to the interpulse periods.
    Type: Grant
    Filed: February 14, 2002
    Date of Patent: April 8, 2003
    Assignee: Rosemount Aerospace Inc.
    Inventors: Charles George Huss, Eric David Haugen
  • Publication number: 20030043695
    Abstract: A signal processing system provides and processes a digital signal, converted from to an analog signal, which includes a noise component and possibly also an information component comprising small samples representing four mutually orthogonal items of measurement information representable as a sample point in a symbolic Cartesian four-dimensional spatial reference system. An information processing sub-system receives said digital signal and processes it to extract the information component. A noise likelihood determination sub-system receives the digital signal and generates a random noise assessment of whether or not the digital signal comprises solely random noise, and if not, generates an assessment of degree-of-randomness. The information processing system is illustrated as combat control equipment for undersea warfare, which utilizes a sonar signal produced by a towed linear transducer array, and whose mode operation employs four mutually orthogonal items of measurement information.
    Type: Application
    Filed: August 22, 2001
    Publication date: March 6, 2003
    Inventors: Francis J. O'Brien, Chung T. Nguyeh
  • Publication number: 20030021187
    Abstract: An acoustic signal processor that samples acoustic data, performs a spectrum analysis of the sampled acoustic data, stores the acoustic data in corresponding frequency bins, and then filters acoustic data stored in a frequency bin by applying a power-law arithmetic operation to the frequency bin acoustic data, such that the power-law arithmetic operation is adaptively changed based on an order dependent determination of whether the frequency bin acoustic data is representative of noise or clutter, or whether it is representative of a signal of an object.
    Type: Application
    Filed: July 30, 2001
    Publication date: January 30, 2003
    Inventors: Ronald A. Wagstaff, Jackson A. Mobbs
  • Patent number: 6501705
    Abstract: An underwater acoustic sensor system for detecting and efficiently displaying data from small, shallow-draft targets at high speeds in shallow or very shallow water. Sonar buoys transmit electrical signals representing sound pressure waves, which are processed to ascertain bearing and signature information for a detected object. A single display having a bearing history area, a frequency history area, and a bearing/frequency area, provide a system operator with efficient correlation between bearing and frequency data.
    Type: Grant
    Filed: June 22, 2000
    Date of Patent: December 31, 2002
    Assignee: Lockheed Martin Corporation
    Inventors: John J. Molini, Warren C. Hollis, Sung Hong
  • Patent number: 6424596
    Abstract: 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 interference pattern at very low frequencies. Noise from nearby near-surface sources, such as merchant ships, super tankers, fishing trawlers, seismic profiling platforms, or other sources near the ocean surface can significantly interfere with the detection and tracking of a quiet target-of-interest (TOI) located well below the ocean surface. The present invention reduces the noise of the near-surface sources without degrading the signal level and quality of the TOI. The present invention utilizes a unique application of the MUSIC beamforming process to separate the noise and signal subspace. Next, eigenvalue beamforming is used to reduce narrowband energy in selected frequency bins wherein the near-surface noise is radiating.
    Type: Grant
    Filed: October 1, 2001
    Date of Patent: July 23, 2002
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: James B. Donald
  • Patent number: 6421300
    Abstract: A method for producing, from passive sonar data, operational images interactively controlled by an operator, continuously adjusted according to operational requirements and compatible with changing information requirements in real time. The invention uses a method for representing a multidimensional data field on a display screen which uses the screen co-ordinates for two dimensions of data and at least one of three color perception components among luminosity, hue and saturation for three other dimensions of the data, to produce bearing-time, azimuth-time, or frequency-time (circulating lofar) or frequency-bearing images with representation of frequencies by hue or interactive filtering.
    Type: Grant
    Filed: May 25, 2000
    Date of Patent: July 16, 2002
    Assignee: Delegation Generale pour l'Armement
    Inventors: Georges Thomas, Didier D B Bergero
  • Patent number: 6418083
    Abstract: 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 estimate of the excess phase rotation is made, and a quantity WSC equal to WSC = [ 1 M ⁢ ∑ i = 3 N ⁢ B ⁡ [ C ⁢   ⁢ Φ i ] L ] is calculated.
    Type: Grant
    Filed: January 12, 2001
    Date of Patent: July 9, 2002
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Ronald A. Wagstaff, Jackson A. Mobbs
  • Patent number: 6411566
    Abstract: A nonlinear signal processing system and method is used to identify nonlinearity (e.g., chaos) in underwater acoustic signals, such as sonar signals. The system and method detects the underwater acoustic signal and digitizes the underwater acoustic signal to produce an acoustic time series. The acoustic time series is reconstructed using a phase space embedding algorithm to generate a phase space embedded acoustic signal. A differential radius signal is generated from the phase space embedded acoustic signal using chaotic radius computations and differential radius computations. Thresholds can be detected in the differential radius signal to reveal nonlinear or chaotic events hidden in the underwater acoustic signal.
    Type: Grant
    Filed: July 25, 2001
    Date of Patent: June 25, 2002
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Richard A. Katz, Azizul H. Quazi
  • Publication number: 20020071344
    Abstract: The present invention discloses an integrated circuit receiver available for infrared or ultrasonic transmission by use of digital filtering for demodulation of infrared or ultrasonic carrier signal. The integrated circuit receiver comprises an infrared receiver or ultrasonic transducer to receive the transmitted signal from outside and output the modulated signal. The modulated or carrier signal is fed to an amplifier circuit to be amplified and then outputted to a digital filter to filter out the carrier from the amplified signal, and thus the original or unmodulated signal is recovered. The filtering thereof is done by a digital filter instead of an analog one, therefore there is no need for discrete devices such as capacitors, resistors, diodes and inductor, and it is suitable to be integrated within a chip as an apparatus to receive and detect infrared and ultrasonic signals.
    Type: Application
    Filed: November 23, 2001
    Publication date: June 13, 2002
    Inventor: Chun-Yang Hsiao
  • Patent number: 6356510
    Abstract: 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 response to the phase and amplitude characteristics of the signals being received for processing. In an embodiment of the invention, an automatic detection method and apparatus is described which has the capability to alert an operator of the presence of signals having phase fluctuation characteristics which match a set of preset conditions (e.g. small fluctuations, medium fluctuations, or large fluctuations).
    Type: Grant
    Filed: February 4, 2000
    Date of Patent: March 12, 2002
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Ronald A. Wagstaff, Jackson A. Mobbs