Noise Or Unwanted Signal Reduction In Nonseismic Receiving System Patents (Class 367/901)
  • Patent number: 10520599
    Abstract: Systems and methods for identifying and locating target objects based on echo signature characteristics are disclosed. According to an aspect, a system includes a transmitter configured to transmit one or more mechanical waves to a target object for echo of the one or more mechanical waves by the target at a predetermined signature characteristic. The system also includes a detector configured to detect the echo. Further, the system includes a computing device configured to identify the predetermined signature characteristic of the detected echo for locating the target object.
    Type: Grant
    Filed: April 18, 2017
    Date of Patent: December 31, 2019
    Inventor: Joshua R. Doherty
  • Patent number: 9635481
    Abstract: A failure detection system includes an omnidirectional microphone array device having a plurality of microphone elements and a directivity control device that calculates a delay time of a voice propagated from a sound source to each microphone element and forms a directivity of the voice using the delay time and the voice collected by the omnidirectional microphone array device, and detects a failure of the microphone element. A smoothing unit calculates an average power of one microphone element. An average calculator calculates a total average power of a plurality of usable microphone elements included in the omnidirectional microphone array device. A comparison unit compares whether or not a difference between the average power and the total average power exceeds a range of ±6 dB, and determines whether the microphone element is in failure based on the comparison result.
    Type: Grant
    Filed: July 27, 2015
    Date of Patent: April 25, 2017
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Hiroyuki Matsumoto, Shuichi Watanabe, Toshimichi Tokuda, Hisashi Tsuji, Akitoshi Izumi, Shintaro Yoshikuni
  • Patent number: 9571659
    Abstract: An embodiment includes a non-transitory computer-readable medium with programming code executable by a processor to perform operations including accessing a scheduled time and teleconference contact information associated with a teleconference calendar event. The operations include determining whether an operator is operating a vehicle based on synchronization between a mobile device and an abstraction and communication device (device) interfaced with the vehicle. When an actual time is within a threshold of the scheduled time and the operator is operating the vehicle, the operations include determining whether the operator is a participant of a teleconference. If so, the operations include extracting the teleconference contact information from the teleconference calendar event. The operations include communicating a prompt to join the teleconference and receiving a confirmation to join the teleconference.
    Type: Grant
    Filed: January 4, 2016
    Date of Patent: February 14, 2017
    Assignee: CLOUDCAR, INC.
    Inventors: Peter Barrett, Bruce Leak, Konstantin Othmer, Zarko Draganic
  • Patent number: 9037079
    Abstract: A mobile device with an underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms. The portable device may be wearable.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: May 19, 2015
    Assignee: WFS TECHNOLOGIES LTD.
    Inventors: Derek Wolfe, Brendan Hyland
  • Patent number: 8682244
    Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: March 25, 2014
    Assignee: WFS Technologies Ltd.
    Inventors: Mark Rhodes, Derek Wolfe, Brendan Hyland
  • Patent number: 8654604
    Abstract: A circuit configuration for evaluating and/or for activating sound transducers for application in vehicles, particularly as a part of a parking assistance, the circuit configuration including a transformer having a primary winding and a secondary winding, and the windings lead to a transformation ratio of greater than 1, terminals being provided for a sound transducer at the secondary winding and terminals being provided at the primary winding for activating device(s) which generate a voltage that changes with time at the primary winding of the transformer; on the side of primary winding (primary side) an antenna being provided which is suitable for receiving electrical fields generated by interference signals, and which is connected to the side of secondary winding (secondary side) via a coupling path; a device for phase shifting being provided in the coupling path, which brings about a phase shift by 180° in the electrical interference signals received by the antenna.
    Type: Grant
    Filed: October 2, 2007
    Date of Patent: February 18, 2014
    Assignee: Robert Bosch GmbH
    Inventors: Roland Beckers, Karl-Heinz Richter
  • Patent number: 8515343
    Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: August 20, 2013
    Assignee: WFS Technologies Ltd.
    Inventors: Mark Rhodes, Derek Wolfe, Brendan Hyland
  • Patent number: 8515344
    Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: August 20, 2013
    Assignee: WFS Technologies Ltd.
    Inventors: Mark Rhodes, Derek Wolfe, Brendan Hyland
  • Patent number: 8385821
    Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: February 26, 2013
    Assignee: WFS Technologies Ltd.
    Inventors: Mark Rhodes, Derek Wolfe, Brendan Hyland
  • Patent number: 8364078
    Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: January 29, 2013
    Assignee: WFS Technologies Ltd.
    Inventors: Mark Rhodes, Derek Wolfe, Brendan Hyland
  • Patent number: 8358973
    Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: January 22, 2013
    Assignee: WFS Technologies Ltd.
    Inventors: Mark Rhodes, Derek Wolfe, Brendan Hyland
  • Patent number: 8346165
    Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: January 1, 2013
    Assignee: WFS Technologies Ltd.
    Inventors: Mark Rhodes, Derek Wolfe, Brendan Hyland
  • Patent number: 8346164
    Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: January 1, 2013
    Assignee: WFS Technologies Ltd.
    Inventors: Mark Rhodes, Derek Wolfe, Brendan Hyland
  • Patent number: 8335469
    Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: December 18, 2012
    Assignee: WFS Technologies, Inc.
    Inventors: Mark Rhodes, Derek Wolfe, Brendan Hyland
  • Patent number: 8331856
    Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: December 11, 2012
    Assignee: WFS Technologies Ltd.
    Inventors: Mark Rhodes, Derek Wolfe, Brendan Hyland
  • Patent number: 8326219
    Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: December 4, 2012
    Assignee: WFS Technolgies Ltd.
    Inventors: Mark Rhodes, Derek Wolfe, Brendan Hyland
  • Patent number: 8315560
    Abstract: An underwater navigation system comprising a transmitter having an electrically insulted magnetic coupled antenna for transmitting an electromagnetic and/or magneto-inductive signal, a receiver having an electrically insulated magnetic coupled antenna for receiving an electromagnetic and/or magneto-inductive signal from the transmitter, and determining means for determining the position of the receiver relative to the transmitter using the received electromagnetic and/or magneto-inductive signal.
    Type: Grant
    Filed: January 13, 2010
    Date of Patent: November 20, 2012
    Assignee: WFS Technologies Ltd.
    Inventors: Mark Rhodes, Derek Wolfe, Brendan Hyland
  • Patent number: 8248233
    Abstract: In one embodiment, a method includes obtaining location information associated with a remote device, and processing the location information. Processing the location information includes determining if the remote device is mobile. The method also includes configuring a filter such that at least one parameter indicates that the remote device is mobile if the remote device is mobile, and configuring the filter such that the at least one parameter indicates that the remote device is approximately stationary if the remote device is not mobile. The filter is applied to the location information to generate a filtered location estimate which is arranged to estimate a location of the remote device.
    Type: Grant
    Filed: April 27, 2009
    Date of Patent: August 21, 2012
    Assignee: Cisco Technology, Inc.
    Inventors: Matthew Aaron Silverman, Santosh G. Pandey, Brian Donald Hart
  • Patent number: 8131213
    Abstract: The present invention discloses a tagging and identification device and system for tracking and monitoring sea vessels as they enter sea ports, estuaries and/or other channels. The tagging device of the present invention comprises a receiver, for receiving an underwater electromagnetic signal transmitted by an underwater beacon. An acoustic transmitter is provided for transmitting an identification signal to an acoustic receiver deployed nearby. The acoustic identification signal is transmitted after an electromagnetic trigger signal is received from the underwater beacon. The tagging and device may further comprise a memory device which can store data relating to position and time of the see vessel to which it is attached. The tagging and identification device of the present invention is covert, compact and is capable of extended active deployment without replenishment of batteries etc.
    Type: Grant
    Filed: April 29, 2010
    Date of Patent: March 6, 2012
    Assignee: WFS Technologies Ltd.
    Inventors: William Luther Porter, Thomas Kurt Nielsen, Brendan Peter Hyland
  • Patent number: 8045919
    Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.
    Type: Grant
    Filed: February 3, 2010
    Date of Patent: October 25, 2011
    Assignee: WFS Technologies, Ltd.
    Inventors: Mark Rhodes, Derek Wolfe, Brendan Hyland
  • Patent number: 7877059
    Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.
    Type: Grant
    Filed: February 3, 2010
    Date of Patent: January 25, 2011
    Assignee: WFS Technologies Ltd.
    Inventors: Mark Rhodes, Derek Wolfe, Brendan Hyland
  • Patent number: 7873316
    Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.
    Type: Grant
    Filed: March 1, 2010
    Date of Patent: January 18, 2011
    Assignee: WFS Technologies Ltd.
    Inventors: Mark Rhodes, Derek Wolfe, Brendan Hyland
  • Patent number: 7853206
    Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.
    Type: Grant
    Filed: February 3, 2010
    Date of Patent: December 14, 2010
    Assignee: WFS Technologies, Ltd.
    Inventors: Mark Rhodes, Derek Wolfe, Brendan Hyland
  • Patent number: 7711322
    Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.
    Type: Grant
    Filed: June 15, 2006
    Date of Patent: May 4, 2010
    Assignee: Wireless Fibre Systems
    Inventors: Mark Rhodes, Derek Wolfe, Brendan Hyland
  • Patent number: 7599254
    Abstract: Light exposure may reduce the static charge inside a capacitive membrane transducer. For example, ultraviolet light shines on or in a cell. The light increases the energy of the charge carrier and/or ionizes gas in the cavity, allowing reverse migration or dissipation of the static charge.
    Type: Grant
    Filed: December 20, 2005
    Date of Patent: October 6, 2009
    Assignee: Siemens Medical Solutions USA, Inc.
    Inventor: Nelson H. Oliver
  • Publication number: 20090201765
    Abstract: A method and a system for detection and position determination of chips, which transmit ultrasound signals in a room. The system comprises electronic identification chips, which are attached to objects that have to be monitored. Each chip is equipped with a transmitter and a receiver. The signals are received by a plurality of detector units, which are connected to a detector base unit that registers and interprets the signals transmitted form the identification chips. Detector base units located in different rooms are interconnected in a network and transmit processed information to one or more central units for further interpretation and sorting. The special feature of the invention is that line interference is substantially removed, and it is possible to determine position even though the identification chips are in motion.
    Type: Application
    Filed: April 13, 2009
    Publication date: August 13, 2009
    Applicant: Sonitor Technologies AS
    Inventors: Sverre Holm, Rune Holm, Ole Hovind
  • Patent number: 7515703
    Abstract: A method for providing an embellishment representation of a noise information is discloses.
    Type: Grant
    Filed: May 19, 2008
    Date of Patent: April 7, 2009
    Assignee: International Business Machines Corporation
    Inventors: Travis M. Grigsby, Steven Michael Miller, Lisa Anne Seacat
  • Patent number: 7480595
    Abstract: It is possible to establish an estimation method capable of logically and optimally deciding a forgetting coefficient and develop an estimation algorithm and a high-speed algorithm which are numerically stable. Firstly, a Processing section reads out or receives an upper limit value ?f from a storage section or an input section (S101). The.processing section decides a forgetting coefficient ? by equation (15) (S103). After this, according to the forgetting coefficient ?, the processing section executes a hyper H? filter of equations (10-13) (S105). The processing section (101) calculates the existence condition of equation (17) (or equation (18) which will be given later) (S107). When the existence condition is satisfied at all the times (S109), ?f is decreased by ?? and the same processing is repeated (S111).
    Type: Grant
    Filed: May 8, 2004
    Date of Patent: January 20, 2009
    Assignee: Japan Science and Technology Agency
    Inventor: Kiyoshi Nishiyama
  • Patent number: 7457197
    Abstract: Low frequency vibration induced noise is reduced in a towed sonar array of the type comprising a number of oil-filled modules joined end to end with each module housing a plurality of hydrophones by arranging that the signal output from each hydrophone in an array is equally weighted at low frequencies to form a single channel. Beamforming is then carried out by applying different weights to the different module channels. High modulus internal strength members are included in each module to resist anti-phase vibration of the couplings at the end of the module. The hydrophone spacing and the coupling lengths are both made small compareed to the module length to improve vibration noise reduction.
    Type: Grant
    Filed: July 26, 1990
    Date of Patent: November 25, 2008
    Assignee: QinetiQ Limited
    Inventor: Alan T Parsons
  • Patent number: 7453771
    Abstract: A noise control system is provided for controlling a noise level around a moveable target. The noise control system has a detecting system configured to detect a location and movement of the target, and a noise cancellation system. The noise cancellation system has a sensor for dynamically sensing noise at the location of the target. The noise cancellation system is configured to be responsive to detection of the location of the target by the detecting system and the sensed noise to provide a noise cancellation wave to a first space at and around the location of the target. The noise cancellation system is further configured to be responsive to detection of the movement of the target by the detecting system and the sensed noise, and to provide a noise cancellation wave to a second space to cover the moving target. The second space is larger than the first space.
    Type: Grant
    Filed: December 19, 2005
    Date of Patent: November 18, 2008
    Assignee: Caterpillar Inc.
    Inventor: Michael C. Gatz
  • Patent number: 7388810
    Abstract: 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 signals to a target (18) in the operating medium. Each of the transmitters and receiver are so spaced apart in a geometrically symmetrical planar array within an acoustically attenuating substrate medium, and each of the transmitted ultrasonic signals are so pulse driven in an acoustically symmetrical relationship, that opposing ultrasonic signals transmitted through the substrate medium by symmetrically opposed transmitters are cancelled at the receiver and a signal for measuring distance to the target is formed at the receiver by combination of the transmitted signals through the operating medium.
    Type: Grant
    Filed: January 25, 2006
    Date of Patent: June 17, 2008
    Assignee: Viren Pty Limited
    Inventor: Lawrence Alexander Campbell
  • Patent number: 7319640
    Abstract: 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 identified by bearing and frequency range. A planewave-fit noise-suppression routine is then used to remove identified noise sources from the transformed signals and to provide a noise-suppressed transformed signal having signals from said identified noise sources suppressed.
    Type: Grant
    Filed: June 26, 2006
    Date of Patent: January 15, 2008
    Assignee: The United States of America represented by the Secretary of the Navy
    Inventors: James B. Donald, Albert H. Nuttall, James H. Wilson
  • 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: 7255196
    Abstract: 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 comprise a rigid shell, a structural damping material, an acoustically absorptive material, and a compliant seal for coupling the shield to the ground or reference surface.
    Type: Grant
    Filed: November 14, 2003
    Date of Patent: August 14, 2007
    Assignee: BBN Technologies Corp.
    Inventors: William B. Coney, Peter A. Krumhansl
  • Patent number: 7245557
    Abstract: 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 underwater information on a display unit on the basis of an echo signal extracted by processing the electric signal. A tailing signal removing unit for removing a tailing signal and extracting only the echo signal is provided in the sonar such that a video of a surface layer fish shoal is clearly displayed on a screen of the display unit without being hidden by a video of the tailing signal.
    Type: Grant
    Filed: December 19, 2005
    Date of Patent: July 17, 2007
    Assignee: Furuno Electric Company Limited
    Inventors: Shinji Ishihara, Takanori Satoh, Mitsuhiro Inouchi, Osamu Kubota, Yuriko Onishi
  • Patent number: 7164621
    Abstract: 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 acoustic axes oriented in a propeller direction are generated from received signals obtained by “A” and “B” group vibrating elements, respectively. Next, adjustment factors used for removing propeller noise from received signals obtained by vibrating elements on positive and negative sides of an x-axis are calculated by performing arithmetic operation on time-series data on the received signals obtained by the positive and negative sides vibrating elements and on time-series data on the reference signals “A” and “B”, respectively.
    Type: Grant
    Filed: November 24, 2004
    Date of Patent: January 16, 2007
    Assignee: Furuno Electric Company, Limited
    Inventors: Akira Okunishi, Yasushi Nishimori, Yasuo Ito
  • Patent number: 7164620
    Abstract: 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 the obtained signals to a third circuit. Here, with two microphones disposed such that a noise source such as a speaker fails to locate at a position of a null of the second directivity, at the output of the second circuit, a signal arriving from the direction of the target sound source is cut off and a signal arriving from the direction of the noise source is passed. The third circuit corrects the output of the first circuit to output a signal with a signal arriving from the direction of the target sound source emphasized and a signal arriving from the direction of the noise source suppressed.
    Type: Grant
    Filed: April 7, 2005
    Date of Patent: January 16, 2007
    Assignee: NEC Corporation
    Inventor: Osamu Hoshuyama
  • Patent number: 7149149
    Abstract: 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 a marine vessel, at least one reference hydrophone mounted to the hull in a laminar region of fluid flow over the hull, and a computational device for generating an output signal for each hydrophone in the acoustic array which is substantially free of flow noise using signals inputted from the acoustic array hydrophones and the at least one reference hydrophone.
    Type: Grant
    Filed: October 5, 2001
    Date of Patent: December 12, 2006
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Edmund J. Sullivan
  • Patent number: 7020044
    Abstract: 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 from acoustic noise interference produced by propulsion systems, hull appendages, waves and bubbles. The apparatus has a support strut that has one end that is joined or attached to the hull of a craft. A sonar pod is attached to the other end of the support strut. The support strut has a ventilation duct and a plurality of ventilation ports. A cavitator is attached to the support strut and produces a sheet cavity as the craft travels in the water. Pressurized air or other gases are injected into the ventilation duct which then exit through the ventilation ports and into the sheet cavity. The pressurized air or gas exiting the ventilation ports expands the sheet cavity to form a gaseous vapor baffle that isolates the sonar pod from acoustic noise.
    Type: Grant
    Filed: October 8, 2004
    Date of Patent: March 28, 2006
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Thomas J. Gieseke, Robert Kuklinski
  • Patent number: 7004031
    Abstract: 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 output signal corresponding to vibration of the piezoelectric vibrator. The reverberation measuring device measures a reverberation period of the piezoelectric vibrator from the output signal. The compensating device compensates for an operation characteristic of the piezoelectric vibrator in accordance with the measured reverberation period. Thus, the ultrasonic sensor can decrease a reverberation period, which may cause reduction in detection accuracy and impossibility of detection of an obstacle at a short distance.
    Type: Grant
    Filed: May 13, 2004
    Date of Patent: February 28, 2006
    Assignees: Denso Corporation, Nippon Soken, Inc.
    Inventors: Kiyonari Oda, Manabu Maeda, Hisanaga Matsuoka, Yoshihisa Sato, Masakazu Takeichi
  • Patent number: 6868044
    Abstract: 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 subarray are summed together. This summed data, which effectively represents data provided by the full array with interference suppressed, may be utilized to detect and/or localize a target of interest. Each subarray is processed independently of all other subarrays. No cross-subarray processing is required. This technique is applicable to linear arrays, multi-line arrays, planar arrays, cylindrical arrays, conformal arrays, and spherical arrays. Applicable sensors include acoustic sensors (e.g., sonar, ultrasonic), electromagnetic sensors (e.g. radar), and optical sensors (e.g., infrared, ultraviolet, visible light).
    Type: Grant
    Filed: January 29, 2003
    Date of Patent: March 15, 2005
    Assignee: Lockheed Martin Corporation
    Inventor: Thomas J. Barnard
  • Patent number: 6859420
    Abstract: 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 logic derives a wind noise rejected output signal based on a function of the assigned weight values and the received signals.
    Type: Grant
    Filed: June 13, 2002
    Date of Patent: February 22, 2005
    Assignee: BBNT Solutions LLC
    Inventors: William B. Coney, Gregory L. Duckworth, John C. Heine
  • Patent number: 6822928
    Abstract: 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 determine the total noise from the received sonar signal in the ocean environment in which the target is located. The method and system provide a sensor gain in response to the determined total noise and the signal strength, and adaptively calculate filter coefficients from the sensor gain and the determined total noise. The method and system also filter the generated bearing data signals using a filter having the calculated filter coefficients.
    Type: Grant
    Filed: April 14, 2003
    Date of Patent: November 23, 2004
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: G. Clifford Carter, Berhane Adal
  • Publication number: 20040153293
    Abstract: A transducer-based sensor system including a drive signal generator for generating a drive signal, a transducer coupled to the drive signal generator and configured to receive the drive signal, a mixer coupled to the transducer and configured to receive output from the transducer where such output results at least in part from physical movement of the transducer, and a diplexer operatively coupled with an output of the mixer and configured to present a substantially matched output impedance to the mixer over an operative range of output frequencies.
    Type: Application
    Filed: January 31, 2003
    Publication date: August 5, 2004
    Inventor: Daniel Robert Blakley
  • Patent number: 6744694
    Abstract: 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 forward face of the cavitator, and a ventilation system for pumping a gas, such as air, into the envelope to create a gas cavity which envelops the supporting strut and equipment downstream of and during a forward movement of the cavitator.
    Type: Grant
    Filed: October 6, 2003
    Date of Patent: June 1, 2004
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Thomas J. Gieseke, Robert Kuklinski
  • Patent number: 6704671
    Abstract: 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 loudness of the audio. The present invention detects a sonic event such as a percussive hit without requiring that the detector be disabled for a fixed time to avoid false triggering. Because the detector is not disabled during the detection process, sonic events occurring in close proximity are easily recognized and not ignored as in some conventional systems.
    Type: Grant
    Filed: July 22, 1999
    Date of Patent: March 9, 2004
    Assignee: Avid Technology, Inc.
    Inventor: Frederick W. Umminger, III
  • Patent number: 6659232
    Abstract: 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 of a signal input coupler connected to a signal transmitter, extracted by means of a signal output coupler and the extracted signal is evaluated by an evaluating circuit for generating a signal representative of the instantaneous position of the object, wherein an opposite magnetic field for the magnetic field generated by the acoustic signal is incoupled in each case after the incouplion of the acoustic signal.
    Type: Grant
    Filed: July 3, 2002
    Date of Patent: December 9, 2003
    Assignee: K.A. Schmersal GmbH & Co.
    Inventor: Christian Oelschlegel
  • Patent number: 6622647
    Abstract: 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 a plurality of motion sensors. The plurality of motion sensors generate a plurality of noise signals based on a hydrodynamic flow noise caused by the marine vessel and acting on the marine vessel. The noise cancellation system further includes a processor receiving the plurality of noise signals and the one or more output signals and applying an active noise cancellation to the one or more output signals to substantially cancel out the flow noise. The active noise cancellation is based on the noise signal.
    Type: Grant
    Filed: June 26, 2001
    Date of Patent: September 23, 2003
    Inventor: Martin L. DePoy
  • Patent number: 6615143
    Abstract: 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, and can be accomplished on a piece-wise basis. There are no restrictions on the locations of measurements. Moreover, the present invention can be used to reconstruct acoustic radiation from a plurality of sources or from a single source surrounded by multiple reflecting surfaces.
    Type: Grant
    Filed: March 1, 2001
    Date of Patent: September 2, 2003
    Assignee: Wayne State University
    Inventor: Sean F. Wu
  • Patent number: 6590833
    Abstract: 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 of the plurality of adaptive notch filters are applied to a standard cross correlation process. In each of the adaptive notch filters, the beam outputs are split into two paths and in one path are applied directly to a signal combiner. In the second path, the beam outputs are delayed. The delayed beam outputs are applied to an adaptive finite impulse response filter, the output of which is an estimate of the narrowband interference contained within the beam output. The narrowband interference is then suppressed in the signal combiner prior to application to the standard cross correlation process.
    Type: Grant
    Filed: August 8, 2002
    Date of Patent: July 8, 2003
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Harold J. Teller