Loudspeaker Feedback Patents (Class 381/96)
  • Patent number: 11000257
    Abstract: Described embodiments include a system (74), including a garment (76), configured to cover at least a portion of a body of a subject, one or more sound transmitters (92) coupled to the garment, configured to transmit sound (128) through the body of the subject, and a plurality of sound detectors (22, 96) coupled to the garment. The sound detectors are configured to detect the transmitted sound following passage of the transmitted sound through the body of the subject, to detect body sound (25) emanating from the body of the subject, and to generate a plurality of sound-detector outputs in response to detecting the transmitted sound and the body sound. The system further includes a processor (98), configured to process the sound-detector outputs, and to generate a processor output in response thereto. Other embodiments are also described.
    Type: Grant
    Filed: February 15, 2017
    Date of Patent: May 11, 2021
    Assignee: SANOLLA LTD.
    Inventors: Doron Adler, David Linhard, Inbal Avraham, Liat Adler, Liran Ziso Avraham
  • Patent number: 10986445
    Abstract: A method for calculating excursion of a diaphragm of a speaker, which includes: calculating a DC resistance based on a feedback signal of the speaker; calculating an impedance based on the feedback signal and the DC resistance; calculating a transfer function between a signal and a velocity of the diaphragm of the speaker based on the DC resistance, the impedance, and a force factor; and calculating the excursion of the diaphragm of the speaker based on an input signal and the transfer function.
    Type: Grant
    Filed: July 21, 2020
    Date of Patent: April 20, 2021
    Assignee: REALTEK SEMICONDUCTOR CORPORATION
    Inventors: Tse-En Lin, Chung-Shih Chu, Wei-Chung Ting, Tien-Chiu Hung
  • Patent number: 10932073
    Abstract: A method and a system for measuring a total sound pressure level of noise, and a computer readable storage medium are provided. The method includes: obtaining a time domain digital signal of a sound pressure signal of the noise; obtaining a frequency domain signal of the sound pressure signal according to the time domain digital signal of the sound pressure signal; obtaining a sound pressure effective value of the sound pressure signal based on the frequency domain signal and according to Parseval's theorem; and converting the sound pressure effective value into the total sound pressure level of the noise.
    Type: Grant
    Filed: December 4, 2019
    Date of Patent: February 23, 2021
    Assignee: AAC Technologies Pte. Ltd.
    Inventors: Yingming Qin, Zheng Xiang, Bing Xie
  • Patent number: 10924871
    Abstract: A method for the identification of a receiver belonging to one of a plurality of receiver types in a hearing aid system includes supplying an electrical input signal to the receiver for sound output. The input signal is a primary signal, and a secondary signal that depends on the input signal is generated on the basis of the sound output. The secondary signal is captured by a sensor which generates an electrical sensor signal depending on the secondary signal. A phase measurement is furthermore carried out by determining a phase difference between the input signal and the sensor signal. The receiver is then identified by assigning the receiver to one of the plurality of receiver types on the basis of the phase difference. A corresponding hearing aid system and an receiver set are also provided.
    Type: Grant
    Filed: June 17, 2019
    Date of Patent: February 16, 2021
    Assignee: Sivantos Pte. Ltd.
    Inventor: Bernd Meister
  • Patent number: 10903802
    Abstract: A circuit comprises a sensing resistor with a resistance Rs, a first amplifier circuit with a first gain factor G, a second amplifier circuit with a second gain factor (1/A), a third amplifier circuit, a current mirror, a buffer, and a peak voltage detector. The first amplifier circuit is coupled to the sensing resistor at a first node and a second node and to the second amplifier circuit, which is further coupled to the current mirror. The buffer is coupled to the current mirror and to the third amplifier circuit, which is further coupled to the peak voltage detector and configured to receive a voltage across a load and a voltage on a ground node. In some implementations, the load is a speaker. In some implementations, a filter is coupled between the first and the second amplifier circuits.
    Type: Grant
    Filed: August 28, 2019
    Date of Patent: January 26, 2021
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Jasjot Singh Chadha
  • Patent number: 10757519
    Abstract: A technique for estimating a set of parameter values for a lumped parameter model of a loudspeaker. The technique includes determining, via a neural network model, a first set of parameter values for the LPM of the loudspeaker based on an audio input signal and a first measured response of a loudspeaker that corresponds to the audio input signal. The technique further includes generating a first LPM response based on the first set of parameter values and comparing the first LPM response to the first measured response of the loudspeaker to determine a first error value. The technique further includes generating, via the neural network model, a second set of parameter values for the LPM of the loudspeaker based on the first error value.
    Type: Grant
    Filed: February 23, 2016
    Date of Patent: August 25, 2020
    Assignee: Harman International Industries, Incorporated
    Inventors: Ajay Iyer, Meenakshi Barjatia
  • Patent number: 10638220
    Abstract: A moving-coil loudspeaker is provided, comprising a vibration system and a magnetic circuit system located below the vibration system; the vibration system including a diaphragm, a spider, and a voice coil, the diaphragm comprising a diaphragm body part and a diaphragm reinforcing part; and the magnetic circuit system including a center washer, a center magnet, and a magnetic yoke; wherein the diaphragm reinforcing part comprises a first conductive material layer, the spider comprises a second conductive material layer, and the diaphragm reinforcing part and the spider are bonded by a conductive adhesive which establishes electrically connection between the first and second conductive material layers; and wherein the first and second conductive material layers functioning as a movable plate, and the center washer, the center magnet, and the magnetic yoke functioning as a fixed plate constitute a capacitor structure for detecting a vibration displacement of the moving-coil loudspeaker.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: April 28, 2020
    Assignee: Goertek, Inc.
    Inventors: Huixian Cao, Shu Jiang, Xinfeng Yang
  • Patent number: 10631095
    Abstract: A speaker device 101 includes vibrating body components constituting a vibrating body, consisting of at least a voice coil 119, a diaphragm 106, and a frame 102, and magnetic circuit components constituting a magnetic circuit, consisting of at least a plate 103, a yoke 104, a magnet 105, and a center pole 112. By winding an insulation coated conductor wire 120 around an outer circumference of any of the magnetic circuit components and connecting one end and the other end of the insulation coated conductor wire, a current flows in the insulation coated conductor wire 120 and makes (+) potentials and (?) potentials that are mixed on the surface of the magnetic circuit component and cause an eddy current equal to each other instantaneously, so that generation of an eddy current can be suppressed.
    Type: Grant
    Filed: April 19, 2016
    Date of Patent: April 21, 2020
    Assignee: MORIYAMA MEIBOKU CO., LTD.
    Inventors: Tatsuyoshi Moriyama, Kazuaki Machida
  • Patent number: 10629222
    Abstract: A sound signal processing method and device are provided for separating sounds of the respective sound sources even when sounds are recorded asynchronously by a plurality of devices. Specifically, the present invention comprises the steps of instructing each of the plurality of devices to output a reference signal of a different frequency, receiving each of the reference signals output from the speaker of the plurality of devices according to the instruction, receiving sound signals in which each of the reference signals output from the speaker of the plurality of devices is input into the microphone of the plurality of devices, calculating a time shift amount of each of the devices based on each of the received reference signals output from the speaker and the received sound signals, and separating the plurality of signal signals input into the microphone of the plurality of devices based on the calculated time shift amount.
    Type: Grant
    Filed: October 9, 2015
    Date of Patent: April 21, 2020
    Assignee: Hitachi, Ltd.
    Inventors: Ryoichi Takashima, Yohei Kawaguchi, Takashi Sumiyoshi, Masahito Togami
  • Patent number: 10623865
    Abstract: A transducer system, comprising an electrodynamic acoustic transducer (1) with a membrane (3), a plurality of voice coils (7, 8) electrically switched in series, and a magnet system (9, 10, 11) is presented, wherein just an outer tap/terminal (T2) of the serially connected voice coils (7, 8) is electrically connected to an audio output of an amplifier (17). Moreover, a method for feeding a sound signal to an electrodynamic acoustic transducer (1) is presented, wherein the voice coils (7, 8) are driven by an audio signal just via an outer tap/terminal (T2) of the serially connected voice coils (7, 8).
    Type: Grant
    Filed: March 27, 2018
    Date of Patent: April 14, 2020
    Assignees: AAC TECHNOLOGIES PTE. LTD., AAC TECHNOLOGIES (NANJING) CO., LTD.
    Inventor: Friedrich Reining
  • Patent number: 10516957
    Abstract: Acoustic transducer systems are described herein and in particular, acoustic transducer systems involving high displacement are described. An example acoustic transducer system includes an acoustic driver, a diaphragm position sensing module for generating a position signal corresponding to a displacement of a diaphragm of the acoustic driver, and a controller operable to: receive an input audio signal; generate a control signal based at least on the input audio signal and the position signal; and transmit the control signal to a voice coil operably coupled to the diaphragm so that the voice coil moves within an air gap within the acoustic driver at least partially in response to the control signal. A height of the voice coil can correspond substantially to a gap height in some embodiments.
    Type: Grant
    Filed: May 4, 2018
    Date of Patent: December 24, 2019
    Assignee: AUDERA ACOUSTICS INC.
    Inventors: David Russell, John French
  • Patent number: 10491994
    Abstract: An apparatus comprising: at least one filter configured to filter an electrical input signal and provide a filtered electrical input signal to at least one speaker module configured to convert the filtered electrical input signal to an acoustic signal; and a detector configured to receive the filtered electrical input signal as a first input and an electrical output signal provided by at least one microphone as a second input; wherein the detector is configured to determine at least one difference between the electrical output signal provided by the at least one microphone and the filtered electrical input signal provided to said speaker module and, in response to the at least one difference provide a control signal to the filter to control the filter.
    Type: Grant
    Filed: March 12, 2010
    Date of Patent: November 26, 2019
    Assignee: Nokia Technologies Oy
    Inventor: Thomas Benedict Slotte
  • Patent number: 10412482
    Abstract: The disclosure provides a loudspeaker apparatus and a method of driving the acoustic transducers by predicting and compensating a physical phenomenon of acoustic pressure changes within an enclosure caused by at least one of the acoustic transducers. The loudspeaker apparatus includes an enclosure having an inner space, a first acoustic transducer, a second acoustic transducer, and a controller. The first and second acoustic transducers are mounted on the enclosure and share the same inner space of the enclosure, such as sound bar and the likes. For the operation of the loudspeaker apparatus, the controller applies an algorithm or mathematical model (e.g., transfer function) to an audio signal received from an external source, so that the sound respectively outputted by the first and second acoustic transducers sharing the same inner space may be compensated as if the first and second acoustic transducers are individually mounted on its own enclosure.
    Type: Grant
    Filed: November 8, 2017
    Date of Patent: September 10, 2019
    Assignee: Merry Electronics (Shenzhen) Co., Ltd.
    Inventors: Diego Jose Hernandez Garcia, Che-Wei Hsu, Chih-Hung Lee
  • Patent number: 10397718
    Abstract: A vibration diaphragm and a manufacturing method thereof are provided. The vibration diaphragm comprises an annular support member, a first vibration diaphragm layer and a circuit layer. The first vibration diaphragm layer is fixedly connected to a support body of the annular support member. The circuit layer is positioned on a surface of the first vibration diaphragm layer that is adjacent to a vibrating voice coil and is fixedly connected to the first vibration diaphragm layer and the support body. The circuit layer is provided with a circuit area, a capacitance area, and a capacitance solder pad. The capacitance area is a capacitance electrode plate formed on the first vibration diaphragm layer. The capacitance area is communicated with the capacitance solder pad by means of the circuit area. The solder pad corresponds to the support body. The reliability of capacitance data acquisition is improved.
    Type: Grant
    Filed: May 24, 2016
    Date of Patent: August 27, 2019
    Assignee: GOERTEK INC.
    Inventors: Guodong Zhao, Pengcheng Ji, Xinfeng Yang
  • Patent number: 10212526
    Abstract: An acoustic pressure reducer acoustically couples to and provides acoustic impedance to attenuate the acoustic box pressure of an acoustic system, such as a loudspeaker system. The pressure reducer may also allow an ambient pressure of the acoustic system to equalize with an ambient pressure of an external environment and the ambient pressure of the acoustic pressure reducer at a certain rate. The attenuation may allow for inexpensive acoustic sensors to be utilized within the pressure reducer to measure one or more acoustic properties of an attenuated acoustic pressure within the pressure reducer. An unattenuated acoustic pressure value of the acoustic system may be estimated using a known transfer function of the pressure reducer and the attenuated acoustic pressure values measured within. A controller coupled to the acoustic system may adjust one or more operating characteristics in response to estimating the unattenuated acoustic pressure.
    Type: Grant
    Filed: January 13, 2017
    Date of Patent: February 19, 2019
    Assignee: BOSE CORPORATION
    Inventors: John Harlan Wendell, Randy Michael Carbo, Eric Carl Mitchell
  • Patent number: 10129642
    Abstract: An audio system comprises an audio driver configured to receive a target audio signal and a feedback signal and to generate an adjusted audio signal responsive to the target audio signal and the feedback signal. A loudspeaker is configured to convert the adjusted audio signal into acoustical sound. A test signal generator is configured to generate a test signal having a higher frequency than the target audio signal. The test signal causes a test current to flow through the loudspeaker. A current sensing circuit is configured to measure the test current flowing through the loudspeaker and to generate a current sense signal indicative of the test current. A feedback circuit is configured generates the feedback signal responsive to the current sense signal.
    Type: Grant
    Filed: February 29, 2016
    Date of Patent: November 13, 2018
    Assignee: QUANTANCE, INC.
    Inventor: Vikas Vinayak
  • Patent number: 10003008
    Abstract: Membrane device comprising a support, a membrane suspended on the support, a first actuator in contact with the membrane designed to apply a force on the membrane, a second actuator in contact with the membrane designed to apply a force on the membrane, means of determining the position of the membrane relative to the support and control means of the first and second actuators, said control means applying a deformation signal to one of the first and second actuators to deform the membrane and applying a control signal to the other of the first and second actuators to control displacement of the membrane, application of the control signal being determined by the membrane position.
    Type: Grant
    Filed: December 19, 2013
    Date of Patent: June 19, 2018
    Assignee: Commissariat a l'energie atomique et aux energies alternatives
    Inventors: Stephane Fanget, Remy DeJaeger, Philippe Robert
  • Patent number: 9960741
    Abstract: A system is disclosed which allows for canceling high frequency rail to rail common mode swing at pulse-width modulation (PWM) frequency for a Class-D, H and G audio amplifier or a Linear Resonance Actuator (LRA) driver. This allows wide bandwidth current sensing without the need of external components, or large on-chip resistor-capacitor (RC) networks, facilitating integration of the sense resistor. In addition, the sense amplifier DC input common mode and audio band common mode swing is reduced, allowing a sense resistor high frequency common mode swing of a least twice the MOSFET gate break down voltages.
    Type: Grant
    Filed: June 27, 2016
    Date of Patent: May 1, 2018
    Assignee: Dialog Semiconductor (UK) Limited
    Inventors: Zakaria Mengad, Vladislav Vasilev, Steven Collins
  • Patent number: 9913041
    Abstract: A voice coil motor controller configured to determine a voltage across and a current through a voice coil motor having an input signal supplied thereto and determine its impedance therefrom, the controller further configured to identify asymmetry in variations of said impedance over time to determine an asymmetry value, the controller further configured to provide for control of said voice coil motor using said asymmetry value.
    Type: Grant
    Filed: August 7, 2015
    Date of Patent: March 6, 2018
    Assignee: NXP B.V.
    Inventor: Lise Daubigny
  • Patent number: 9893685
    Abstract: A driving apparatus includes a power amplifier that supplies a driving signal to a vibrator, a current detector that outputs a detection signal corresponding to a driving current of the vibrator, and a driving controller that positively feedback a signal based on the detection signal to the power amplifier. The driving controller includes an A/D converter that A/D converts the detection signal, a first processing section that applies a gain compensation and compressor processes to an output digital signal of the A/D converter, a second processing section that performs a process of adding a digital signal corresponding to an input signal of the driving apparatus to an output digital signal of the first processing section, and a D/A converter that D/A converts an output digital signal of the second processing section to produce an analog signal supplied to the power amplifier.
    Type: Grant
    Filed: April 15, 2015
    Date of Patent: February 13, 2018
    Assignee: Yamaha Corporation
    Inventor: Morito Morishima
  • Patent number: 9822873
    Abstract: A position sensor system is useful for monitoring positions of shifters in transmissions and other applications. The position sensing system has an array of magneto resistive sensors and a controller configured to determine a position of a magnet along a path by triangulation. Some embodiments are relatively insensitive to fluctuations in a distance between the sensors and the path. Also described is an actuating assembly comprising a movable cylinder and a fixed rod. The actuating assembly may be applied for moving synchronizers or the like in power transmissions.
    Type: Grant
    Filed: March 22, 2013
    Date of Patent: November 21, 2017
    Assignee: PACIFIC RIM ENGINEERED PRODUCTS (1987) LTD.
    Inventors: Kenneth Hartmann Andreasen, Jonathan David Deagle, Bradley Edward Williams
  • Patent number: 9674593
    Abstract: A loudspeaker controller (1) for controlling a loudspeaker (2), configured to determine time-varying impedance information of the loudspeaker (2) based on a loudspeaker voltage and a measure of a loudspeaker current and provide for control of the loudspeaker (2) in accordance with said time-varying impedance information.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: June 6, 2017
    Assignee: NXP B.V.
    Inventors: Temujin Gautama, Alan OCinneide, Lutsen Ludgerus Albertus Hendrikus Dooper
  • Patent number: 9392379
    Abstract: Method and apparatus for entrainment containment in digital filters using output phase modulation. Phase change is gradually introduced into the acoustic feedback canceller loop to avoid entrainment of the feedback canceller filter. Various embodiments employing different output phase modulation approaches are set forth and time and frequency domain examples are provided. Additional method and apparatus can be found in the specification and as provided by the attached claims and their equivalents.
    Type: Grant
    Filed: January 5, 2015
    Date of Patent: July 12, 2016
    Assignee: Starkey Laboratories, Inc.
    Inventors: Arthur Salvetti, Harikrishna P. Natarajan, Jon S. Kindred
  • Patent number: 9386387
    Abstract: A circuit for conditioning an acoustic transducer driving signal includes an inner feedback circuit having a test signal input for receiving a test signal, a feedback input for receiving a feedback signal, circuitry for forming an output signal including circuitry for amplifying the input signal according to the feedback signal, and an output for providing the output signal. The circuit also includes an outer feedback circuit having a signal input for receiving the output signal from the inner feedback circuit, a desired offset input for receiving a signal representative of a desired output offset, a first low-pass filter circuit for detecting an actual offset in the output signal, signal combination circuitry for forming the feedback signal including combining the actual offset with the desired output offset, and a feedback output for providing the feedback signal to the feedback input of the inner feedback circuit.
    Type: Grant
    Filed: May 21, 2014
    Date of Patent: July 5, 2016
    Assignee: LISTEN, INC.
    Inventors: Anthony A. Scott, Steve F. Temme
  • Patent number: 9374634
    Abstract: In an example embodiment, an apparatus includes an enclosure having a loudspeaker mounted therein. The apparatus also includes an IC package mounted inside the enclosure. The IC package includes an amplifier configured to amplify an input audio signal, received at an input of the amplifier, to produce a drive signal. The amplifier is configured to drive the loudspeaker with the drive signal via an output of the amplifier. The IC package also includes a pressure sensor configured to output a status signal, indicative of a sound pressure level inside the enclosure, from an output terminal of the pressure sensor. The apparatus also includes an audio processing circuit connected to the amplifier and configured to adjust strength of the drive signal produced by the amplifier, as a function of the sound pressure level indicated by the status signal.
    Type: Grant
    Filed: July 10, 2014
    Date of Patent: June 21, 2016
    Assignee: NXP B.V.
    Inventor: Christophe M. Macours
  • Patent number: 9357291
    Abstract: A mass port configured to tune a frequency response of an audio reproduction device is disclosed. The mass port includes a head portion and an insertion portion coupled to the head portion. The head portion includes a sealing structure on a rear side. The head portion is configured to attach to a rear plate of a driver at the sealing structure. The insertion portion is configured to be inserted into a speaker port on the rear plate of the driver. The head portion and the insertion portion include an air slot that runs through the head portion and the insertion portion.
    Type: Grant
    Filed: August 21, 2014
    Date of Patent: May 31, 2016
    Assignee: SkullCandy, Inc.
    Inventors: James Lang, Samuel Steele Noertker, Harry Van
  • Patent number: 9351068
    Abstract: A portable electronic device has an acoustic port having an aperture in a housing having a speaker and pressure sensing transducer incorporated therein. During normal use of the portable electronic device, the aperture of the acoustic port may become obstructed during handling, holstering or surface placement, resulting in reduced sound quality and a waste of energy from a battery powering the device. The pressure sensing transducer detects an obstruction of the acoustic port by detecting an increase in acoustic pressure within the housing or within an acoustic chamber coupling the aperture of the acoustic port to the speaker. In response, acoustic characteristics of the obstructed port speaker's audio are altered to conserve power or enhance audio. Furthermore, acoustic characteristics of speakers of unobstructed acoustic port apertures of the device may also be altered in response to detection of the obstruction.
    Type: Grant
    Filed: June 14, 2013
    Date of Patent: May 24, 2016
    Assignee: BlackBerry Limited
    Inventors: Jason Lance Slupeiks, Nathan Robert Webster, Sidi El Becaye Maiga
  • Patent number: 9344822
    Abstract: Embodiments for estimating nonlinear distortion and for tuning parameter(s) for boosting sounds are described. A test signal including at least two simultaneous audible tones is generated. One tone is a fundamental tone and others are harmonics of the fundamental tone. The ratio of the number of nonlinear distortion products not coincident with the frequencies of the tones to the number of all the products is, as an example, greater than 0.80. A spectral analysis is performed on the response of a loudspeaker to the test signal. A nonlinear distortion value is estimated by regarding the energy at harmonic frequencies of the fundamental tone signal but not at the frequencies of the tone signals as contribution from the nonlinear distortion. A subjectively correlated measure of nonlinear distortion is obtained for tuning a parameter for boosting low frequency outputs of one or more loudspeakers.
    Type: Grant
    Filed: July 3, 2012
    Date of Patent: May 17, 2016
    Assignee: Dolby Laboratories Licensing Corporation
    Inventor: Huiqun Deng
  • Patent number: 9331864
    Abstract: This disclosure describes an audio video distribution system that uses a local area network to distribute a digital audio signal and that uses multiple network speaker nodes to broadcast the digital audio in a multi speaker session. The system includes a local area network that distributes the digital audio signal for the audio video distribution system. In addition, the system includes a first network speaker node participating in a multi speaker session and performing in a master mode, and where the first network speaker node calculates, originates, and controls a distributed multi session clock that is distributed over the network. The system further includes one or more additional network speaker nodes participating in the multi speaker session and perform in a slave mode, and where the additional network speaker nodes receive the distributed multi session clock from the first speaker node.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: May 3, 2016
    Assignee: NETSTREAMS, LLC
    Inventors: Michael Braithwaite, Herman Cardenas
  • Patent number: 9319781
    Abstract: A personal audio device, such as a wireless telephone, includes noise canceling circuit that adaptively generates an anti-noise signal from a reference microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone may also be provided proximate the speaker to measure the output of the transducer in order to control the adaptation of the anti-noise signal and to estimate an electro-acoustical path from the noise canceling circuit through the transducer. A processing circuit that performs the adaptive noise canceling (ANC) function also detects frequency-dependent characteristics in and/or direction of the ambient sounds and alters adaptation of the noise canceling circuit in response to the detection.
    Type: Grant
    Filed: March 4, 2013
    Date of Patent: April 19, 2016
    Assignee: CIRRUS LOGIC, INC.
    Inventors: Jeffrey Alderson, Jon D. Hendrix, Dayong Zhou
  • Patent number: 9301071
    Abstract: An audio system comprises an audio driver configured to receive a target audio signal and a feedback signal and to generate an adjusted audio signal responsive to the target audio signal and the feedback signal. A loudspeaker is configured to convert the adjusted audio signal into acoustical sound. A test signal generator is configured to generate a test signal having a higher frequency than the target audio signal. The test signal causes a test current to flow through the loudspeaker. A current sensing circuit is configured to measure the test current flowing through the loudspeaker and to generate a current sense signal indicative of the test current. A feedback circuit is configured generates the feedback signal responsive to the current sense signal.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: March 29, 2016
    Assignee: QUANTANCE, INC.
    Inventor: Vikas Vinayak
  • Patent number: 9301053
    Abstract: An apparatus including a diaphragm, where the diaphragm includes a membrane having electrically conductive material; a drive configured to move the diaphragm; and a connector configured to connect the membrane to a ground.
    Type: Grant
    Filed: November 22, 2013
    Date of Patent: March 29, 2016
    Assignee: Nokia Corporation
    Inventors: Jian Guo, Antero Tossavainen, Veijo Kajanus, Jingyu Huang
  • Patent number: 9276559
    Abstract: [Object] To provide an induced signal removing circuit that feeds back induced voltage regarded as electrical signals into the input side of an inductive load to remove the induced voltage from the metal part, the induced voltage appearing even across an insulated metal part in response to signals input to the inductive load.
    Type: Grant
    Filed: January 27, 2012
    Date of Patent: March 1, 2016
    Assignee: Audio-Labo Corporation
    Inventor: Hiroshi Yamashita
  • Patent number: 9271078
    Abstract: An audio output device includes a housing, a speaker, a switching unit, a fixing component and a control unit. An opening is formed on the housing. The speaker is for outputting sound. The switching unit is installed inside the housing. The fixing component is fixed in the opening of the housing for triggering the switching unit so that the switching unit outputs a switching signal. The control unit is electrically connected to the switching unit and the speaker, and the control unit controls the speaker to output sound in a corresponding sound field as the control unit receives the switching signal.
    Type: Grant
    Filed: May 14, 2014
    Date of Patent: February 23, 2016
    Assignee: Wistron Corporation
    Inventors: Chih-Ming Hsu, Kuo-Hua Chen
  • Patent number: 9253574
    Abstract: There is disclosed methods and apparatus for decomposing a signal having a plurality of channels into direct and diffuse components. The correlation coefficient between each pair of signals from the plurality of signals may be estimated. A linear system of equations relating the estimated correlation coefficients and direct energy fractions of each of the plurality of channels may be constructed. The linear system may be solved to estimate the direct energy fractions. A direct component output signal and a diffuse component output signal may be generated based in part on the direct energy fractions.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: February 2, 2016
    Assignee: DTS, Inc.
    Inventors: Jeff Thompson, Brandon Smith, Aaron Warner, Zoran Fejzo, Jean-Marc Jot
  • Patent number: 9202450
    Abstract: A method of measuring an impulse response of an amplifier coupled in operation to a loudspeaker arrangement includes: (a) coupling directly to a connection between the amplifier and the loudspeaker arrangement for obtaining access to a drive signal (Samp) applied to the loudspeaker arrangement to generate an acoustic output (S2); (b) disposing a microphone arrangement for receiving the acoustic output (S2) of the loudspeaker arrangement; (c) using a test signal generator to apply a test signal (Ssw) to an input of the amplifier; and (d) receiving at a digital signal processing arrangement (DSP, 210) at least the drive signal (Samp) and the acoustic output (S2) corresponding to the test signal (Ssw) and performing on these signals a signal processing operation for determining an impulse response for at least one of: the amplifier, the loudspeaker arrangement.
    Type: Grant
    Filed: July 20, 2012
    Date of Patent: December 1, 2015
    Inventor: Mikko Pekka Vainiala
  • Patent number: 9173020
    Abstract: A control method of sound producing, sound producing apparatus, and portable apparatus are provided. The control method of sound producing is for a portable device, including the following steps. (a) A first detected parameter indicating a detected excursion of a speaker of the portable device is generated. (b) A second audio signal is generated based on a first audio signal, wherein the second audio signal is generated selectively by compensation according to at least the first detected parameter. (c) A gain value is determined according to at least the first detected parameter and a third audio signal is generated based on the second audio signal according to the gain value.
    Type: Grant
    Filed: January 28, 2013
    Date of Patent: October 27, 2015
    Assignee: HTC Corporation
    Inventors: Chih-Chiang Cheng, Ting-Wei Sun, Hann-Shi Tong
  • Patent number: 9143847
    Abstract: The present invention provides a loudspeaker with a port tube having an acoustic leakage path through a motile part thereof. In this way, excess energy caused by longitudinal resonance at higher frequencies is radiated transversely through the port tube walls rather than contributing to the output of the loudspeaker itself.
    Type: Grant
    Filed: March 2, 2012
    Date of Patent: September 22, 2015
    Assignee: GP ACOUSTICS (UK) LIMITED
    Inventor: Mark Alexander Dodd
  • Patent number: 9131297
    Abstract: Provided are an audio signal processing apparatus and method. The audio signal processing apparatus includes: a sensing unit for sensing an impedance value of a headphone and adjusting a gain to be applied to an audio signal based on the sensed impedance value; and an amplifier for generating an output audio signal by receiving at least one bias voltage corresponding to the adjusted gain and amplifying the input audio signal according to the adjusted gain. The audio signal processing apparatus is capable of appropriately adjusting the magnitude of an acoustic signal output from a headphone, according to the product specifications of the headphone.
    Type: Grant
    Filed: September 6, 2012
    Date of Patent: September 8, 2015
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Han-ki Kim, Hae-kwang Park, Dong-hyun Lim
  • Patent number: 9118985
    Abstract: A vehicle sound system includes a subwoofer system having a subwoofer, a satellite amplifier for driving the subwoofer, a host amplifier for receiving an audio signal, a noise management processing unit for providing, to the host amplifier, information to be used for achieving a desired audio environment, a sensor for providing information to the noise management processing unit concerning the ambient audio environment, a control line between the satellite amplifier and the host amplifier for transmission of control signals to the satellite amplifier, and a signal line between the satellite amplifier and the host amplifier for transmission of audio signals to the satellite amplifier, the satellite controller being configured to cause a diagnostic signal to be placed on the control line, the diagnostic signal being indicative of an operating condition of the subwoofer system.
    Type: Grant
    Filed: December 4, 2012
    Date of Patent: August 25, 2015
    Assignee: Bose Corporation
    Inventor: Remco Terwal
  • Patent number: 9088841
    Abstract: A signal processor including an equalizer responsive to an input signal and to a parameter signal, said equalizer configured to provide an output signal to an electro-acoustical transducer for compensating a frequency response of said electro-acoustical transducer; a transducer element for monitoring at least a physical parameter of said electro-acoustical transducer, said transducer element configured to provide a transducer signal, a processor block responsive to said transducer signal, configured to provide said parameter signal.
    Type: Grant
    Filed: January 3, 2012
    Date of Patent: July 21, 2015
    Assignee: STMicroelectronics S.r.l.
    Inventors: Marco Veneri, Francesco Bianchi
  • Patent number: 9084051
    Abstract: A unidirectional active microphone that includes a diaphragm, coil, and piezoelectric component. An electrical circuit provides amplification to the coil. The piezoelectric component produces unidirectional coupling between coil and diaphragm. The microphone is unidirectional in that the amplification is provided solely to the coil and is not transferred to the diaphragm.
    Type: Grant
    Filed: January 31, 2012
    Date of Patent: July 14, 2015
    Assignee: The Rockefeller University
    Inventors: Albert James Hudspeth, Tobias Reichenbach
  • Patent number: 9082415
    Abstract: A sound determination apparatus receives acoustic signals by a plurality of sound receiving units, and generates frames having a predetermined time length. The sound determination apparatus performs FFT on the acoustic signals in frame units, and converts the acoustic signals to a phase spectrum and amplitude spectrum, which are signals on a frequency axis, then calculates the difference at each frequency between the respective acoustic signals as a phase difference, and selects frequencies to be the target of processing. The sound determination apparatus calculates the percentage of frequencies at which the absolute values of the phase differences of the selected frequencies are equal to or greater than a first threshold value, and determines that the acoustic signal coming from the nearest sound source is included in the frame when the calculated percentage is equal to or less than a second threshold value.
    Type: Grant
    Filed: November 27, 2007
    Date of Patent: July 14, 2015
    Assignee: FUJITSU LIMITED
    Inventor: Shoji Hayakawa
  • Patent number: 9055370
    Abstract: An audio system includes a passive radiator that is attached to one end of a lever arm. The other end of the lever arm is attached to a mass that serves to move out of phase of the passive radiator to cancel mechanical vibrations of the passive radiator, but without significantly affecting audio output. The lever arm is attached to a mechanical ground, which may be the enclosure on which the passive radiator is mounted. A system may use multiple lever arms to reduce rocking of the passive radiator.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: June 9, 2015
    Assignee: Bose Corporation
    Inventors: Christopher J. Link, Hal Greenberger
  • Patent number: 9049523
    Abstract: An electroacoustic transducer for converting electrical input signals into acoustic output signals includes a diaphragm adapted to move relative to a housing in response to the electrical input signals to produce the acoustic output signals, a displacement sensor, a bias voltage source, and an amplifier. The displacement sensor includes a first electrode adhered to the diaphragm and a second electrode on a first surface of the housing located proximate to the first electrode. A capacitance between the first electrode and the second electrode varies with a displacement of the diaphragm relative to the housing. The bias voltage source is coupled to at least one of the first electrode or the second electrode and provides a fixed charge to the electrode to which it is attached. The amplifier amplifies a change in voltage between the first and second electrodes to produce an output voltage between first and second signal outputs.
    Type: Grant
    Filed: August 19, 2011
    Date of Patent: June 2, 2015
    Assignee: Bose Corporation
    Inventors: Amar G. Bose, John H. Wendell
  • Patent number: 9049501
    Abstract: An electrical apparatus to sense current through a load includes a first input terminal having a first input voltage relative to a reference, a second input terminal having a second input voltage relative to the reference, a first load terminal of the load having a first load voltage relative to the reference, a second load terminal of the load having a second load voltage relative to the reference, a first current sensing element connected between the first input terminal and the first load terminal and a second current sensing element connected between the second input terminal and the second load terminal. A first sense voltage is determined by a relationship between the first input voltage and the second load voltage and a second sense voltage is determined by a relationship between the second input voltage and the first load voltage.
    Type: Grant
    Filed: July 17, 2012
    Date of Patent: June 2, 2015
    Assignee: Bose Corporation
    Inventors: Kenneth B. Delpapa, Michael B. Nussbaum, Jay N. Teixeira, George Nichols, Thomas A. Froeschle
  • Patent number: 9025775
    Abstract: An apparatus for enhancing a multichannel audio signal comprising at least two channels configured to: estimate a value representing a direction of arrival associated with a first audio signal from at least a first channel and a second audio signal from at least a second channel of at least two channels of a multichannel audio signal; determine a scaling factor dependent on the direction of arrival associated with the first audio signal and the second audio signal; and apply the scaling factor to a parameter associated with a difference in audio signal levels between the first audio signal and the second audio sign.
    Type: Grant
    Filed: July 1, 2008
    Date of Patent: May 5, 2015
    Assignee: Nokia Corporation
    Inventor: Pasi Ojala
  • Patent number: 9020171
    Abstract: A method for controlling adaptation of a feedback suppression filter in a hearing aid comprises the step of suspending the adaptation of the feedback suppression filter when the level of a hearing aid reference signal is below a predetermined threshold. The invention further provides a hearing aid with a feedback suppression filter and with means for suspending adaptation of the feedback suppression filter.
    Type: Grant
    Filed: March 26, 2012
    Date of Patent: April 28, 2015
    Assignee: Widex A/S
    Inventors: Helge Pontoppidan Foeh, Peter Magnus Norgaard, Thilo Volker Thiede
  • Patent number: 9014397
    Abstract: A signal processing device includes: a detection unit generating a digital detection signal corresponding to motion of a diaphragm of a speaker to output the digital detection signal; a gain adjustment unit generating a digital feedback signal by multiplying the outputted digital detection signal by again coefficient to output the generated digital feedback signal; a combining unit combining the outputted digital feedback signal with a digital audio signal; a storage unit storing plural gain coefficients; and a control unit performing control so that a given gain coefficient is selected from the plural gain coefficients and that the selected gain coefficient is used for the multiplication.
    Type: Grant
    Filed: February 9, 2012
    Date of Patent: April 21, 2015
    Assignee: Sony Corporation
    Inventor: Michiaki Yoneda
  • Patent number: 8995673
    Abstract: An audio power management system manages operation of audio devices in an audio system. The audio power management system includes a parameter computer, a threshold comparator and a limiter. Audio signals generated with the audio system may be provided to the audio power management system. Based on a measured actual parameter of the audio signal, such as a real-time actual voltage and/or a real-time actual current, the parameter computer can derive estimated operational characteristics of audio devices, such as a loudspeaker included in the audio system. The threshold comparator may use the estimated operational characteristics to develop a threshold and manage operation of one of more devices in the audio system by monitoring the measured actual parameter, and selectively directing the limiter to adjust the audio signal, or another device in the audio system to protect or optimize performance.
    Type: Grant
    Filed: June 4, 2012
    Date of Patent: March 31, 2015
    Assignee: Harman International Industries, Incorporated
    Inventors: Ryan J. Mihelich, Jeffrey Tackett, Douglas K. Hogue