Audio Transducer Protection Circuitry Patents (Class 381/55)
  • Patent number: 11432087
    Abstract: According to various embodiments, there may be provided an electronic device comprising: a housing comprising a first space connected to the outside of the electronic device; a speaker device arranged inside the housing; a speaker housing comprising a second space formed to be spatially separated from the inner space of the electronic device by the speaker device inside the housing, the second space being arranged to be connected to the first space; a first atmospheric pressure sensor which is exposed to the first space and has a waterproofing function; a second atmospheric pressure sensor arranged in the inner space; and a processor, wherein the electronic device is configured to detect immersion of the electronic device in water or removal thereof from the immersion on the basis of the amount of atmospheric pressure change confirmed through the first atmospheric pressure sensor, and is configured to control the water-repellent operation through the speaker device on the basis of a difference value between f
    Type: Grant
    Filed: January 15, 2019
    Date of Patent: August 30, 2022
    Inventors: Hongki Kim, Seonho Han, Jin Kim, Taegyun Kim, Dongheon Jang
  • Patent number: 11379674
    Abstract: A magnetic field generation device may include a coil generating a magnetic field, a drive part configured to apply a voltage to the coil or supply a current to the coil, a monitoring part configured to acquire state information whose value is varied together with temperature of the coil, and a control part which controls the voltage applied by the drive part or the current supplied by the drive part based on the state information acquired by the monitoring part.
    Type: Grant
    Filed: June 6, 2019
    Date of Patent: July 5, 2022
    Assignee: NIDEC SANKYO CORPORATION
    Inventors: Keiji Miyazawa, Yohei Shimizu, Satoru Aoki
  • Patent number: 11356796
    Abstract: An example device configured to obtain image data includes a memory configured to store one or more priority values, each of the one or more priority values being associated with a type of image object associated with the image data. The device includes one or more processors coupled to the memory, and configured to associate image objects in the image data with one or more audio sources represented in one or more audio streams. The one or more processors are also configured to assign a respective priority value to each of the one or more audio sources represented in the one or more streams and code ambisonic coefficients based on the assigned priority value.
    Type: Grant
    Filed: November 18, 2020
    Date of Patent: June 7, 2022
    Assignee: Qualcomm Incorporated
    Inventors: Ferdinando Olivieri, Taher Shahbazi Mirzahasanloo, Nils Günther Peters
  • Patent number: 11333622
    Abstract: A method for determining a direct current impedance of a transducer may include receiving an input signal indicative of an electrical power consumed by the transducer and calculating, by a thermal model of the transducer, the direct current impedance based on the electrical power.
    Type: Grant
    Filed: April 7, 2020
    Date of Patent: May 17, 2022
    Assignee: Cirrus Logic, Inc.
    Inventors: Emmanuel Marchais, Carl Lennart Ståhl, Eric Lindemann, Jason W. Lawrence, Dayong Zhou
  • Patent number: 11329610
    Abstract: The present invention generally relates to a structure and method of audio amplifier with power feedback, including a power amplifying unit, a loud-speaker, a current sensing unit, a voltage sensing unit and a multiplying unit. The power amplifying unit includes an input side and an output side, the input side inputs an audio voltage signal, and the loudspeaker is electrically connected to an output side of the power amplifying unit. The current sensing unit is electrically connected to the output side of the power amplifying unit and senses the output current of the power amplifying unit and then converts it into a current control voltage signal. The voltage sensing unit is electrically connected to the output side of the power amplifying unit, and senses the output voltage of the power amplifying unit to form an output sensing voltage signal.
    Type: Grant
    Filed: November 7, 2019
    Date of Patent: May 10, 2022
    Inventor: Chung-Fu Chou
  • Patent number: 11284192
    Abstract: The present invention relates to a speaker driver and an operation method thereof and includes an amp part configured to output a pulse voltage, in which an input signal is amplified on the basis of a supply voltage, to drive a capacitive speaker that generates sound by a driving voltage so that the driving voltage formed by filtering the pulse voltage is applied to the capacitive speaker, and a controller configured to adjust a magnitude of an input audio signal in a high frequency range and transmit the input audio signal to the amp part as the input signal to limit an overcurrent applied to the capacitive speaker by the driving voltage having a high frequency.
    Type: Grant
    Filed: June 15, 2018
    Date of Patent: March 22, 2022
    Assignee: IRON DEVICE CORPORATION
    Inventors: Ki Tae Park, Jin Sung Kim, Kyu Don Choi, Hwang Soo Son
  • Patent number: 11146221
    Abstract: The invention relates to a method for protecting a component (6) within an audio device (4) from the exceedance of a maximum internal temperature (TI), wherein a power loss (V) of the component (6) is determined, a measurement temperature (TM) is measured on the component (6), a temperature difference (DT) for the component (6) between the measurement temperature (TM) on the component and the internal temperature (TI) is determined from the power loss (V) by means of a thermal model (14) of the component (6), the internal temperature (TI) is determined as the sum of the measurement temperature (TM) and the temperature difference (DT), a permissible maximum value (VM) for the power loss (V) is determined on the basis of the internal temperature (TM) and known component data (16) of the component (6), and the component (6) is operated in a normal operating mode (N) if the power loss (V) does not exceed the maximum value (VM) or the component (6) is otherwise operated in reduced-power economy operating mode (S)
    Type: Grant
    Filed: April 11, 2018
    Date of Patent: October 12, 2021
    Assignee: Robert Bosch GmbH
    Inventors: Fabian Hoffmeister, Gregor Sauer, Josef Plager, Patrick Engl, Thomas Stein
  • Patent number: 11095983
    Abstract: A multiple speaker outdoor audio system receiving wi fi signals. The array comprises multiple range 30 to 40 ohm speakers connected in parallel to a wi fi enabled amplifier. The number of speakers are selected to maintain the load on the system amplifier within an acceptable range, usually 1 to 8 ohms. The array may also include a low range speaker such as an 8 ohm sub-woofer. The speaker array “kit” may be used indoors or outdoors and allows the user to distribute an array of speakers and sub woofer over an area to achieve balanced coverage using Wi Fi amplifier.
    Type: Grant
    Filed: July 18, 2019
    Date of Patent: August 17, 2021
    Inventor: Jeffery J Coombs
  • Patent number: 11026008
    Abstract: The present disclosure provides a microphone and a terminal device. The microphone includes: a housing, a flexible circuit board, and a signal converter. The housing includes cavity with an open end; the flexible circuit board is connected to the housing to block the opening of the cavity. The signal converter disposed in the cavity is configured to convert a sound signal into an electrical signal and connected to the flexible circuit board.
    Type: Grant
    Filed: September 25, 2019
    Date of Patent: June 1, 2021
    Assignee: Beijing Xiaomi Mobile Software Co., Ltd.
    Inventors: Chiafu Yen, Hui Du
  • Patent number: 10978998
    Abstract: An amplifying device includes a first amplifier, a voltage-limiting circuit, a second amplifier, a first controller, and a second controller. The first amplifier is configured to amplify an input signal. The voltage-limiting circuit is configured to limit a voltage of an output signal from the first amplifier to within a limit range. The second amplifier is configured to amplify an output signal from the voltage-limiting circuit. The first controller is configured to control the limit range in accordance with a current supplied to a load from the second amplifier. The second controller is configured to decrease an amplification factor of the first amplifier in a state in which the voltage-limiting circuit limits the voltage of the output signal from the first amplifier.
    Type: Grant
    Filed: December 19, 2019
    Date of Patent: April 13, 2021
    Assignee: Yamaha Corporation
    Inventor: Takeshi Togawa
  • Patent number: 10945066
    Abstract: A vibration-proof structure and electronic device utilizing the same is disclosed. The electronic device includes a housing in which a display or a circuit board is mounted. The electronic device further includes a vibration-generating component mounted within the housing a vibration-proof member coupled with the vibration-generating component, the vibration-proof member having an insertion hole formed centrally therein, and a fixing protrusion protruding from a surface of the housing, the fixing protrusion having an extended shoulder disposed at an end of the fixing protrusion, and inserted into the insertion hole of the vibration-proof member to dampen vibrations from the vibration-generating component when the housing is coupled to the vibration-proof member and the vibration-generating component.
    Type: Grant
    Filed: May 17, 2019
    Date of Patent: March 9, 2021
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Brian Han, Hwanmyung Noh
  • Patent number: 10939199
    Abstract: The present invention is invented for reproducing the sound more faithfully by newly adding elements related to resistance and friction when calculating a power change signal for driving a speaker. In the signal generated by a signal generator, a rise of the signal is sharp when moving from the static state. Consequently, a diaphragm of the speaker can start to move in accordance with the original sound reproduction method.
    Type: Grant
    Filed: July 19, 2017
    Date of Patent: March 2, 2021
    Inventor: Kota Takahashi
  • Patent number: 10893359
    Abstract: Systems and devices configured by an algorithm to prevent or limit a speaker over-excursion are disclosed. The disclosed algorithm is computationally efficient because it exploits a relationship between an audio signal and a speaker's excursion that exists at low-frequencies, below a self-resonance of a speaker. The disclosed algorithm combines the low-frequency excursion protection with a high-frequency, transient excursion protection. The combined approach allows the transient excursion protection to use a shorter delay than otherwise possible. The shorter delay allows for a compressor to apply attenuation to a transient audio signal before a momentum of the speaker, caused by the transient audio signal, grows too large to be controlled.
    Type: Grant
    Filed: February 10, 2020
    Date of Patent: January 12, 2021
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventor: James A. Meacham, II
  • Patent number: 10785567
    Abstract: A method of fabricating a piezoelectric transducer may include interleaving a plurality of layers of piezoelectric material with a plurality of conductive layers including a first conductive layer, one or more second conductive layers, and one or more third conductive layers, coupling the first conductive layer to a first electrode, wherein an electrical impedance of the first conductive layer varies as a function of a temperature internal to the piezoelectric transducer, and such that a measurement signal indicative of the electrical impedance is generated at the first electrode, coupling the one or more second conductive layers to a second electrode, and coupling the one or more third conductive layers to a third electrode, such that an electrical driving signal driven to the second electrode and the third electrode causes mechanical vibration of the piezoelectric transducer as a function of the electrical driving signal.
    Type: Grant
    Filed: June 16, 2020
    Date of Patent: September 22, 2020
    Assignee: Cirrus Logic, Inc.
    Inventors: Nicholas Roche, Anthony S. Doy, Itisha Tyagi
  • Patent number: 10783866
    Abstract: A sound producing device includes at least one air pulse generating element. Each of the at least one air pulse generating element includes a membrane, a first air chamber and at least one opening, wherein a chamber pressure exists in the first air chamber, and the opening is connected between the first air chamber and an ambient surrounding the sound producing device. The membrane is actuated to change the chamber pressure of the first air chamber to generate a plurality of air pulses, the air pulses are propagated through the at least one opening, the air pulses produce a non-zero offset in terms of sound pressure level, and the non-zero offset is a deviation from a pressure value of an ambient pressure outside the sound producing device.
    Type: Grant
    Filed: March 4, 2020
    Date of Patent: September 22, 2020
    Assignee: xMEMS Labs, Inc.
    Inventors: Jemm Yue Liang, Lei Chen, Martin George Lim
  • Patent number: 10734959
    Abstract: The present technology relates to a sound processing device, a method, and a program capable of suppressing an excessive amplitude and obtaining higher quality of sound. A sound processing device includes: a prediction value calculation unit that calculates a prediction value of a displacement of a speaker according to an input signal supplied to the speaker on the basis of an equivalent model of the speaker; and an amplitude control unit that performs amplitude control on the input signal in a case in which the prediction value is greater than a predetermined threshold value. The present technology can be applied to a sound reproduction system.
    Type: Grant
    Filed: December 8, 2017
    Date of Patent: August 4, 2020
    Assignee: SONY CORPORATION
    Inventors: Michiaki Yoneda, Yoshiyuki Kuroda, Masaki Kamata
  • Patent number: 10728659
    Abstract: The present invention relates in one aspect to a method of controlling or limiting diaphragm excursion of a loudspeaker. The method comprising steps of receiving a first audio signal and deriving an excursion signal representing diaphragm excursion of the electrodynamic loudspeaker from the first audio signal. The method additionally comprises deriving an excursion envelope from the excursion signal and applying a second audio signal, derived from the first audio signal, to an input of an adjustable low-frequency suppressor. The second audio signal is filtered by the adjustable low-frequency suppressor to selectively attenuate low-frequency components based on the excursion envelope to produce a processed audio signal with reduced low-frequency content.
    Type: Grant
    Filed: May 2, 2017
    Date of Patent: July 28, 2020
    Assignee: Purifi APS
    Inventors: Bruno Putzeys, Lars Risbo
  • Patent number: 10728640
    Abstract: An electronic device with a heat radiation structure using an audio device is provided. The electronic device includes a first housing, a speaker module disposed on a surface of the first housing and configured to output sounds in a first direction, a sound reflection plate mounted above the surface of the first housing and having a first surface facing the speaker module, and a heat emission device disposed on a second surface of the sound reflection plate. The sound reflection plate may absorb heat generated from the heat emission device, and discharge the absorbed heat to the outside of the electronic device through a space between the surface of the first housing and the first surface of the sound reflection plate.
    Type: Grant
    Filed: July 12, 2018
    Date of Patent: July 28, 2020
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Yo-Han Lee, Jung-Kyun Ryu, Jun-Ho Park, Won-Sik Song, Jong-Chan Won, Seung-Yong Lee, Young-Su Lee, Bo-Kun Choi, Chang-Ryong Heo
  • Patent number: 10667050
    Abstract: An audio circuit drives a speaker. A DSP corrects an audio signal S1 according to the state of the speaker. An amplifier drives the speaker according to a corrected audio signal S3.
    Type: Grant
    Filed: August 31, 2018
    Date of Patent: May 26, 2020
    Assignee: ROHM CO., LTD.
    Inventors: Kenichi Moritoki, Mitsuaki Sakamoto
  • Patent number: 10638227
    Abstract: There is provided a method for processing an audio input signal and a corresponding audio filter system. The method includes applying non-linear time-domain processing to the input signal to generate a processed copy of the input signal, transforming the input signal and the processed copy of the input signal to the frequency domain, and performing a comparison in the frequency-domain based on the transformed input signal and the transformed processed copy of the input signal. The method also includes determining at least one control parameter based on the comparison, performing frequency-domain processing of the transformed input signal based on the control parameter, and generating an output signal by transforming the frequency-domain processed signal to the time domain.
    Type: Grant
    Filed: December 2, 2016
    Date of Patent: April 28, 2020
    Assignee: DIRAC RESEARCH AB
    Inventor: Mattias Arlbrant
  • Patent number: 10637421
    Abstract: An audio playback device that includes an audio receiver module, a loudspeaker module and an audio control circuit is provided. The audio control circuit includes an interface and a gain adjusting module. The interface receives an audio signal from an audio source. Under a first operation mode, the audio signal is transmitted only to the audio receiver module to be playback. Under a second operation mode, the audio signal is transmitted to the audio receiver module and to the loudspeaker module to be playback. The gain adjusting module includes a temperature sensing circuit to sense a temperature of the audio receiver module and a gain adjusting circuit electrically coupled between the audio interface and the audio receiver module to adjust a gain of the audio signal according to the temperature.
    Type: Grant
    Filed: June 6, 2018
    Date of Patent: April 28, 2020
    Assignee: REALTEK SEMICONDUCTOR CORPORATION
    Inventors: Cheng-Pin Chang, Tsung-Peng Chuang
  • Patent number: 10582300
    Abstract: Methods and Apparatus for estimating a temperature of an electromechanical transducer. The method comprising receiving an audio signal (901); providing an output signal to the electromechanical transducer, based on the audio signal (902); and determining whether a first magnitude of the audio signal in a first frequency band is above a magnitude threshold (903). In response to the first magnitude being above or equal to the magnitude threshold, calculating a first impedance of the electromechanical transducer based on measurements of a first voltage and a first current of the electromechanical transducer within the first frequency band (905), and estimating the temperature of the electromechanical transducer based on the first impedance (907).
    Type: Grant
    Filed: June 12, 2018
    Date of Patent: March 3, 2020
    Assignee: Cirrus Logic, Inc.
    Inventors: Ylva Ellen Maria Bjork, Erik Vilhelm Lindahl, Jason William Lawrence, Christopher Ekbom
  • Patent number: 10567895
    Abstract: Embodiments described herein provide a method in a thermal model based estimator and a thermal model based estimator for estimating a temperature of a transducer. The method comprises receiving a first signal wherein the first signal is representative of an impedance across the transducer; receiving an indication of a current across the transducer; determining an estimated thermal power based on the indication of the current and an estimated temperature signal, determining, based on the estimated thermal power, the estimated temperature signal using a thermal model of the transducer comprising states defined by a thermal state vector; comparing the first signal with a second signal derived from the estimated temperature signal; updating the thermal state vector of the thermal model based on the comparison; and; outputting the estimated temperature signal.
    Type: Grant
    Filed: October 9, 2018
    Date of Patent: February 18, 2020
    Assignee: Cirrus Logic, Inc.
    Inventors: Jason William Lawrence, Antonio Jesus Diez Elorza
  • Patent number: 10531193
    Abstract: A temperature detecting and controlling integration device for the micro speaker is provided. After the filter receives an input signal, the power amplifier adjusts the power amplification, and the multi-frequency detection signal is generated with the waveform generator. The extracted signal is generated to drive the micro speaker to emit a sound signal. Afterwards, the voltage signals are extracted at two ends of the coil and the temperature signal is obtained by converting, capturing, and integrating to pass the temperature value to the external device, and the temperature value of the non-linear temperature-controlling unit is analyzed to adjust the compensation gain in real time. The smoothly control of speaker temperature and stable playback of the sound signals is played that can be achieved.
    Type: Grant
    Filed: August 31, 2018
    Date of Patent: January 7, 2020
    Assignee: XIAMEN FOURIER ELECTRONICS CO., LTD.
    Inventors: Xuexin Ding, Weiji Liu, Jian Xu, Lin Zhang, Xiaolei Liu, Yingshun Jiang, Fangkang Shen
  • Patent number: 10506347
    Abstract: One embodiment provides a vented box loudspeaker system comprising a speaker driver and a controller configured to receive a source signal for reproduction via the driver, determine a target displacement of the driver and a target sound pressure based on a first physical model of the system, and generate a control voltage based on the target displacement, the target sound pressure, and a second physical model of the system. Another embodiment provides a passive radiator loudspeaker system comprising an active speaker driver and a controller configured to receive a source signal for reproduction via the driver, determine a target displacement of a component based on a first physical model of the system, and generate a control voltage based on the target displacement and a second physical model of the system. In both embodiments, an actual displacement of the driver during the reproduction is controlled based on the generated control voltage.
    Type: Grant
    Filed: January 17, 2018
    Date of Patent: December 10, 2019
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Pascal M. Brunet
  • Patent number: 10381994
    Abstract: A loudspeaker real-time state variable prediction system may include a loudspeaker having a voice coil and a magnet, and a non-linear excursion model configured to estimate non-linear excursion of the loudspeaker. The system may further include a thermal model configured to utilize thermal parameters and frequency based on at least one thermal property of the loudspeaker, and a gain adjustment thermal limiter configured to apply a gain reduction an incoming audio signal to protect the loudspeaker from thermal overload.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: August 13, 2019
    Assignee: Harman International Industries, Incorporated
    Inventors: Douglas J. Button, Russell H. Lambert
  • Patent number: 10356522
    Abstract: This application describes methods and apparatus for loudspeaker protection. A loudspeaker protection system (100) is described having a first frequency band-splitter (102) for splitting an input audio signal (Vin) into a plurality of audio signals (v1, v2 . . . , vn) in different respective frequency bands (?1, ?2 . . . , ?n). A first gain block (103) is configured to apply a respective frequency band gain (g1, g2 . . . , g3) to each of the audio signals in the different respective frequency bands and a gain controller (107, 108, 109) is provided for controlling the respective band gains. A displacement modeller (104, 105) determines a plurality of displacement signals (x1, x2 . . . , xn) based on the input audio signal (Vin) and a displacement model (104a) where each displacement signal corresponds to a modelled cone displacement for the loudspeaker for one of said different respective frequency bands.
    Type: Grant
    Filed: February 1, 2016
    Date of Patent: July 16, 2019
    Assignee: Cirrus Logic, Inc.
    Inventors: Jason William Lawrence, Roberto Napoli, Roger Serwy, Jie Su, Stefan Williams, Rong Hu, Firas Azrai
  • Patent number: 10327083
    Abstract: The invention relates to a MEMS sound transducer, in particular a MEMS loudspeaker and/or a MEMS microphone, for generating and/or detecting sound waves in the audible wavelength spectrum, with a support element (9), a membrane (2) deflectable with respect to the support element (9) along a z-axis, at least one piezoelectric actuator (7) supported on the support element (9) for deflecting the membrane (2) and one electronic control unit (11) for driving the actuator (7). In accordance with the invention, the MEMS sound transducer features at least one position sensor (19), by means of which the control unit (11) can provide a sensor signal (37) that is dependent on the membrane deflection.
    Type: Grant
    Filed: August 1, 2016
    Date of Patent: June 18, 2019
    Assignee: USound GmbH
    Inventors: Andrea Rusconi Clerici Beltrami, Ferruccio Bottoni
  • Patent number: 10306363
    Abstract: A method for operating a distributed wireless audio system including several loudspeaker cabinets all of which can communicate with each other as part of a computer network. The method receives temperature data that is indicative of temperature of a first loudspeaker cabinet, which has a network master responsibility of obtaining an audio signal from an audio source and wirelessly transmitting some of the audio signal to a second loudspeaker cabinet of several loudspeaker cabinets, for playback by the second loudspeaker cabinet, while playing back some of the audio signal by the first loudspeaker cabinet. The method determines whether a thermal threshold of the first loudspeaker cabinet has been reached, based on the temperature data. The method, in response to the thermal threshold being reached, gives up the network master responsibility from the first loudspeaker cabinet to the second loudspeaker cabinet, where doing so reduces temperature in the first loudspeaker cabinet.
    Type: Grant
    Filed: July 11, 2018
    Date of Patent: May 28, 2019
    Assignee: Apple Inc.
    Inventors: Afrooz Family, Daniel R. Borges, Daniel S. Naito, James M. Hollabaugh, Jay S. Nigen
  • Patent number: 10250978
    Abstract: A system includes a gain control circuit configured to dynamically select a gain value based on an estimated temperature for a speaker voice coil, a base gain value, and a threshold temperature value. The system also includes a power control circuit configured to determine a power limit value based on the gain value. The system also includes a filter circuit configured to adjust values of a digitized audio signal based on the power limit value. The system also includes a digital-to-analog converter (DAC) coupled to the filter circuit and configured to convert a digital output of the filter circuit to an analog audio signal.
    Type: Grant
    Filed: July 23, 2018
    Date of Patent: April 2, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Supriyo Palit
  • Patent number: 10219074
    Abstract: A method of thermal protection of a voice coil of a loudspeaker comprises: determining an estimate of a temperature of the voice coil, determining an estimate of a rate of change of the temperature of the voice coil, determining an estimate of power dissipation in the voice coil, and generating a gain control signal for modulating a gain applied to an input signal in a signal path between an input terminal and the loudspeaker. The gain control signal is generated as a function of all of the estimate of the temperature of the voice coil, the estimate of the rate of change of the temperature of the voice coil, and the estimate of the power dissipation in the voice coil.
    Type: Grant
    Filed: January 24, 2018
    Date of Patent: February 26, 2019
    Assignee: Cirrus Logic, Inc.
    Inventors: Roberto Napoli, Stefan Williams
  • Patent number: 10206038
    Abstract: This application relates to methods and apparatus for loudspeaker protection. A loudspeaker protection system (100) receives a digital audio signal comprising a plurality of samples at an input node (IN). A delay block (15) delays the digital audio signal and a gain block (14) applies a controlled gain to the delayed digital audio signal. An excursion predictor (12) is configured to receive a version of the audio signal from the signal path upstream of the delay block and determine a predicted excursion for a loudspeaker based on the audio signal. A gain controller (23) controls a gain setting (g) of the gain block in response to the predicted excursion and a first loudspeaker impulse response model and a predetermined excursion limit. The gain controller (23) is configured to determine at least one gain setting {ga gi} to be applied to a set of samples {Va . . .
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: February 12, 2019
    Assignee: Cirrus Logic, Inc.
    Inventors: Jason William Lawrence, Roger David Serwy, Roberto Napoli
  • Patent number: 10163432
    Abstract: A system and method (referred to as the system) that actively reduces noise in a vehicle. The system generates one or more control output signals to drive multiple loudspeakers; and adapts multiple control coefficients of a control filter based on multiple secondary path transfer functions. The secondary path transfer functions model the acoustic paths between each loudspeaker and multiple microphones. The multiple control coefficients are time varying and frequency dependent and the rate the plurality control coefficients adapt is based on an adaptive step size based on one or more step size criteria.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: December 25, 2018
    Assignee: 2236008 Ontario Inc.
    Inventor: Mark Robert Every
  • Patent number: 10123143
    Abstract: Errors in measurements of a resistor to monitor current through a speaker may be corrected to improve the accuracy, performance, or quality of other signals affected by the measurement. Error may occur in the current measurement resulting from variations in measurements involving the resistor, such as errors based on the sense resistor's response to temperature or voltage differential. Correcting the measurement errors can prevent the overcurrent condition from occurring, and otherwise improve audio output from the speaker. Thus, a method for correcting measurements in a speaker monitoring circuit may include monitoring a current through a speaker by receiving a measurement that is correlated to the current output through the speaker; and correcting the measurement for one or more inaccuracies in the measurement.
    Type: Grant
    Filed: September 26, 2016
    Date of Patent: November 6, 2018
    Assignee: Cirrus Logic, Inc.
    Inventors: Vamsikrishna Parupalli, Lingli Zhang, Jeremy Babcock, Marc L. Tarabbia
  • Patent number: 10051369
    Abstract: A multiple speaker array for audio systems. The array comprises multiple range 30 to 40 ohm speakers connected in parallel. The number of speakers are selected to maintain the load on the system amplifier within an acceptable range, usually 1 to 8 ohms. The array may also include a low range speaker such as an 8 ohm sub-woofer. The speaker array “kit” may be used indoors or outdoors and allows the user to distribute an array of speakers and sub woofer over an area to achieve balanced coverage using conventional amplifiers.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: August 14, 2018
    Inventor: Jeffery James Coombs
  • Patent number: 9973163
    Abstract: Volume levels of content being presented via a device can be controlled. The device can receive or stream video or audio content. An audio manager component (AMC) can process the content to control the volume level of the content as it is presented on a presentation component based on a set point and/or upper and/or lower threshold volume levels. The set point can be set by a user. The AMC can map a high volume audio signal or a low volume audio signal to a defined volume range around the set point based on the upper and/or lower threshold volume levels. The AMC can analyze respective audio signals of the content, interpolate and determine respective adjusted volume levels of the respective audio signals, and adjust the respective volume levels to the respective adjusted volume levels based on the analysis results and the mapping.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: May 15, 2018
    Assignee: The DIRECTV Group, Inc.
    Inventor: Randall Desmond
  • Patent number: 9967663
    Abstract: Systems and methods for loudspeaker protection against excessive excursion are described. In an illustrative, non limiting embodiment, a method may include splitting an input signal into two or more signals, each of the two or more signals within a given frequency band; independently selecting between a power attenuation or an excursion attenuation for each of the two or more signals; independently applying the selected power attenuation or excursion attenuation to each of the two or more signals; combining the attenuated two or more signals into an output signal; and providing the output signal to a loudspeaker.
    Type: Grant
    Filed: December 2, 2015
    Date of Patent: May 8, 2018
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Anker Bjoern-Josefsen, Lars Risbo, Theis Christiansen
  • Patent number: 9877127
    Abstract: A method and system for testing a temperature tolerance limit of a loudspeaker. The method includes: selecting a test signal, and determining a test output voltage as a rated voltage of the loudspeaker, so that the loudspeaker reaches a rated amplitude; determining a gain boosting frequency point according to a resonant frequency of the loudspeaker; performing a plurality of tests for the loudspeaker, and in each test controlling the test signal to maintain the gain constant in a frequency band lower than the gain boosting frequency point and increase the gain in a frequency band higher than the gain boosting frequency point, testing and recording a temperature of the loudspeaker till the loudspeaker fails, and recording a temperature at the time of the failure; and determining a highest temperature that is tolerable by the loudspeaker before the loudspeaker fails.
    Type: Grant
    Filed: December 7, 2015
    Date of Patent: January 23, 2018
    Assignee: GOERTEK INC.
    Inventors: Kang Ping, Xinfeng Yang, Dong Qiu
  • Patent number: 9837971
    Abstract: For protecting a speaker, an input signal is received, and an excursion of the speaker that would be caused by the input signal is predicted. In response to the predicted excursion exceeding a threshold, a targeted excursion of the speaker is determined by compressing the predicted excursion. The targeted excursion is translated into an output signal, which is output to the speaker.
    Type: Grant
    Filed: April 16, 2012
    Date of Patent: December 5, 2017
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Chenchi Luo, Milind A. Borkar, Arthur J. Redfern
  • Patent number: 9820075
    Abstract: The present disclosure relates to a system for and method of stereophonic widening in loudspeakers. The method includes the steps of: monitoring an amplifier state and/or loudspeaker state; generating an effect control signal in response to monitoring the amplifier state and/or a loudspeaker state; applying the effect control signal to an effect processor. The effect processor controls an amount of stereophonic widening based on the effect control signal.
    Type: Grant
    Filed: January 14, 2016
    Date of Patent: November 14, 2017
    Assignee: NXP B.V.
    Inventor: Christophe Marc Macours
  • Patent number: 9807502
    Abstract: Psychoacoustic models may be applied to audio signals being reproduced by an audio speaker to reduce input signal energy applied to the audio transducer. Using the psychoacoustic model, the input signal energy may be reduced in a manner that has little or no discernible effect on the quality of the audio being reproduced by the transducer. The psychoacoustic model selects energy to be reduced from the audio signal based, in part, on human auditory perceptions and/or speaker reproduction capability. The modification of energy levels in audio signals may be used to provide speaker protection functionality. For example, modified audio signals produced through the allocation of compensation coefficients may reduce excursion and displacement in a speaker; control temperature in a speaker; and/or reduce power in a speaker.
    Type: Grant
    Filed: June 24, 2016
    Date of Patent: October 31, 2017
    Assignee: Cirrus Logic, Inc.
    Inventors: Ziad Ramez Hatab, Dalton Elliot Altstaetter
  • Patent number: 9800967
    Abstract: The present invention includes a system for alerting a headphone user that another individual is attempting to gain the user's attention. The system includes an alert receiver designed to easily mate with the headphones and an audio source. The alert receiver wirelessly communicates with an alert transmitter that can be manually operated by the individual. This system enables an individual to easily alert the headphone user without requiring either party have or use a telephone.
    Type: Grant
    Filed: February 2, 2015
    Date of Patent: October 24, 2017
    Inventor: Jessica Bennett
  • Patent number: 9692383
    Abstract: The invention is directed to determining a gain for an equalizer associated with an audio device. An exemplary method comprises determining a maximum audio output level allowed by an acoustic safety threshold; determining a setting of the equalizer; and adjusting a gain of the equalizer based on the setting and the maximum audio output level. The invention enables an audio device to simultaneously satisfy an acoustic safety threshold and deliver an optimum audio output level.
    Type: Grant
    Filed: February 27, 2014
    Date of Patent: June 27, 2017
    Assignees: Sony Corporation, Sony Mobile Communications Inc.
    Inventors: Martin Nystrom, Sead Smailagic, Andrej Petef
  • Patent number: 9628926
    Abstract: In one embodiment of the present invention, a loudspeaker modeling subsystem configures a neural lumped parameter loudspeaker (NeLP) model to represent the behavior of a loudspeaker. The NeLP model is implemented as a cascaded combination of a lumped parameter model (LPM) and a neural network (NN) model. To configure the model, the loudspeaker modeling subsystem first estimates values for the parameters used in the LPM. The loudspeaker modeling subsystem then “fixes” these parameters and trains the NN model to act on a predicted output pressure that is generated via the LPM. More specifically, the loudspeaker modeling subsystem configures the NN to modify the predicted output pressure to minimize the error between the predicted output pressure and a measured loudspeaker output pressure. Notably, by strategically fusing the LPM and the NN model, the NeLP model leverages the strengths and mitigates the weaknesses typically associated with conventional loudspeaker modeling techniques.
    Type: Grant
    Filed: May 1, 2015
    Date of Patent: April 18, 2017
    Assignee: HARMAN INTERNATIONAL INDUSTRIES, INC.
    Inventor: Ajay Iyer
  • Patent number: 9525945
    Abstract: Methods and systems for thermal protection of a voice coil of a loudspeaker. The method involves driving the loudspeaker based on an input signal received at an input terminal and monitoring both a voltage applied to the voice coil and a current flowing through the voice coil. From the monitored voltage and current, an estimate of temperature of the voice coil and an estimate of power dissipation in the voice coil is determined. The method includes estimating the voice coil resistance based on the monitored voltage and current and at least the estimate of temperature is determined based the estimate of resistance. A gain control signal for modulating a gain applied to the input signal is generated as a function of both the estimate of temperature of the voice coil and the estimate of power dissipation in the voice coil.
    Type: Grant
    Filed: January 22, 2015
    Date of Patent: December 20, 2016
    Assignee: Cirrus Logic, Inc.
    Inventors: Anthony Magrath, Roberto Napoli
  • Patent number: 9432771
    Abstract: In accordance with embodiments of the present disclosure, a system may include a controller configured to be coupled to an audio speaker. The controller may be configured to receive an audio input signal. The controller may also be configured to, based on a linear displacement transfer function associated with the audio speaker, process the audio input signal to generate a modeled linear displacement of the audio speaker, wherein the linear displacement transfer function has a response that models linear displacement of the audio speaker as a linear function of the audio input signal.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: August 30, 2016
    Assignee: Cirrus Logic, Inc.
    Inventor: Samuel Oyetunji
  • Patent number: 9414160
    Abstract: A method, system and apparatus for loudspeaker excursion domain processing are provided. At a device comprising: a processor, a loudspeaker comprising a voice coil, one or more devices for determining loudspeaker voltage and current as a function of time, t, and a memory storing a Bl product for the loudspeaker, loudspeaker currents I(t) and corresponding voltages V(t) are received at the processor from the one or more devices. A current-from-voltage transfer function HIV(?) is derived from the loudspeaker currents I(t) and voltages V(t), as a function of frequency, ?. A Fourier space excursion-from-voltage transfer function HXV(?) is determined, whose form is constrained by parameters HIV(?), Bl, Rvc, and Lvc, where: Rvc comprises a resistance of the voice coil; and Lvc comprises an inductance of the voice coil. Filter coefficients are determined using HXV(?), which are used in a filter applied to an input signal for the loudspeaker.
    Type: Grant
    Filed: November 27, 2014
    Date of Patent: August 9, 2016
    Assignee: BLACKBERRY LIMITED
    Inventors: Andre John Van Schyndel, James David Gordy, Brady Nicholas Laska
  • Patent number: 9414161
    Abstract: A method, system and apparatus for loudspeaker excursion domain processing and thermal limiting are provided. At a device comprising: a processor; a loudspeaker and voice coil, device(s) for determining loudspeaker voltage and current; a volume device; and a memory storing a Bl product for the loudspeaker, a Fourier space excursion-from-voltage transfer function HXV(?) is determined. An acoustic response of the loudspeaker below a dovetail frequency, is determined, relative to a respective acoustic response at the dovetail frequency, using at least a second time derivative of the transfer function HXV(?). An equalization is determined using the acoustic response, comprising gains that, when applied to the acoustic response, will adjust the acoustic response to the respective acoustic response at the respective acoustic response at the dovetail frequency. Filter coefficients are determined corresponding to the equalization, which are used in a filter applied to a loudspeaker input signal.
    Type: Grant
    Filed: November 27, 2014
    Date of Patent: August 9, 2016
    Assignee: BLACKBERRY LIMITED
    Inventor: Andre John Van Schyndel
  • Patent number: 9362878
    Abstract: In accordance with embodiments of the present disclosure, a system may include an audio speaker and a controller coupled to the audio speaker. The controller may receive a current signal indicative of an electrical current associated with the audio speaker and a voltage signal indicative of an electrical voltage associated with the audio speaker. In response to the current signal and the voltage signal, the controller may estimate modeled characteristics for the audio speaker, and based on the modeled characteristics, control an audio signal communicated from the controller to the audio speaker wherein the modeled characteristics are based on discrete-time domain information and displacement domain information and the discrete-time domain information and the displacement domain information are used to update the modeled characteristics.
    Type: Grant
    Filed: February 1, 2013
    Date of Patent: June 7, 2016
    Assignee: Cirrus Logic, Inc.
    Inventor: Jie Su
  • Patent number: 9350314
    Abstract: The audio amplifier includes a variable gain amplifier receiving the input audio signal and providing the output signal, whereby the output signal corresponds to the input signal amplified by a limiter gain. The audio amplifier further includes a limiter gain calculation unit, thus the input signal is amplified by the limiter gain. A control unit receives a signal representative of the input signal and is configured to estimate, based on a mathematical model, the input current or the total output current of the audio amplifier thus providing an estimated current signal corresponding to (and resulting from) the output signal, whereby the limiter gain calculation unit is configured to calculate, dependent on the estimation, the limiter gain such that the actual input current or the total output current of the audio amplifier does not exceed a threshold current value.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: May 24, 2016
    Assignee: Harman Becker Automotive Systems GmbH
    Inventors: Gerhard Pfaffinger, Franz Lorenz, Stefan Zuckmantel, Markus Christoph