With Electrostatic Loudspeaker Patents (Class 381/116)
  • Patent number: 10231060
    Abstract: An electrostatic transducer has two oppositely disposed counter-electrodes and a diaphragm which is disposed between the two counter-electrodes and which has a first weakly conductive coating. In its edge region the diaphragm has a second well-conductive coating on the first coating to protect the latter.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: March 12, 2019
    Assignee: Sennheiser electronic GmbH & Co. KG
    Inventors: Jörg Riechers, Manfred Hibbing
  • Patent number: 10185054
    Abstract: A sensing system responsive to a wavefield of acoustic or seismic signals. In one embodiment, the system includes a frame having a surface of tubular shape about which a layer of piezoelectric material can be positioned to extend along a first direction. A piezoelectric element is positioned under tension to apply a force against the frame, which tension increases signal response of the element.
    Type: Grant
    Filed: November 4, 2016
    Date of Patent: January 22, 2019
    Assignee: Quantum Technology Sciences, Inc.
    Inventors: Brian Richard Kryszczynski, Mark Andrew Tinker, Paul Armin Nyffenegger, Kenneth Allan Ports
  • Patent number: 10065852
    Abstract: A MEMS device includes a substrate, a supporter, a first back plate, a second back plate and a diaphragm. The substrate has a cavity. The supporter is over the substrate. The first back plate is over the cavity and fixed on the supporter. The second back plate is over the cavity and fixed on the supporter. The diaphragm is between the first back plate and the second back plate. The diaphragm includes a first sub-diaphragm and a second sub-diaphragm over the cavity and fixed on the supporter.
    Type: Grant
    Filed: September 26, 2016
    Date of Patent: September 4, 2018
    Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
    Inventors: Chun-Wen Cheng, Chia-Hua Chu, Ming-Dao Wu, Tzu-Heng Wu
  • Patent number: 10057689
    Abstract: The present invention provides a silicon speaker comprising an MEMS acoustoelectric chip and a PCB substrate, wherein the MEMS acoustoelectric chip comprises a corrugated diaphragm on a silicon substrate; and one side surface of the MEMS acoustoelectric chip is metalized, and the metalized side surface of the MEMS acoustoelectric chip is connected with the PCB substrate. The corrugated diaphragm is electrically conductive and interconnected with metal paths on MEMS acoustoelectric chip, which is led out to a first PCB metal path as one electrode. A second PCB metal path below the MEMS chip forms another electrode of the electrostatic actuator. The silicon speaker provided by the present invention lowers manufacturing costs of the speaker, and allows the diaphragm to generate high and repeatable/reliable sound pressure upon large displacements so as to improve the sounding effects of the speaker.
    Type: Grant
    Filed: August 26, 2014
    Date of Patent: August 21, 2018
    Assignee: GOERTEK INC.
    Inventor: Quanbo Zou
  • Patent number: 9924275
    Abstract: An improved loudspeaker having pump cards that include an array of electrically conductive membrane transducers (such as polyester-metal membrane pumps). The array of electrically conductive membrane transducers combine to generate the desired sound by the use of pressurized airflow. The array of electrically conductive membranes has a total membrane area that is at least five times larger than the face area of the loudspeaker. In some embodiments, the loudspeaker includes a dynamic DC bus controller that maintains the DC bus level slightly above the inverter output (audio signal).
    Type: Grant
    Filed: February 5, 2016
    Date of Patent: March 20, 2018
    Assignee: Clean Energy Labs, LLC
    Inventors: Joseph F. Pinkerton, David A. Badger, William Neil Everett, William Martin Lackowski
  • Patent number: 9866955
    Abstract: Provided are methods and systems for enhancing the intelligibility of an audio (e.g., speech) signal rendered in a noisy environment, subject to a constraint on the power of the rendered signal. A quantitative measure of intelligibility is the mean probability of decoding of the message correctly. The methods and systems simplify the procedure by approximating the maximization of the decoding probability with the maximization of the similarity of the spectral dynamics of the noisy speech to the spectral dynamics of the corresponding noise-free speech. The intelligibility enhancement procedures provided are based on this principle, and all have low computational cost and require little delay, thus facilitating real-time implementation.
    Type: Grant
    Filed: August 22, 2014
    Date of Patent: January 9, 2018
    Assignee: GOOGLE LLC
    Inventors: Willem Bastiaan Kleijn, Petko N. Petkov
  • Patent number: 9807536
    Abstract: A method and a system for achieving a self-adaptive surround sound.
    Type: Grant
    Filed: June 27, 2014
    Date of Patent: October 31, 2017
    Assignee: Goertek, Inc.
    Inventors: Song Liu, Shasha Lou, Bo Li
  • Patent number: 9743167
    Abstract: An apparatus includes a microelectromechanical system (MEMS) device having a diaphragm and a back plate; a clipping circuit coupled to the MEMS device, wherein the clipping circuit is configured to clip an output signal of the MEMS device so that the maximum signal drawn by a buffer is substantially constant over a temperature range; and an integrated circuit coupled to the clipping circuit, the integrated circuit including the buffer.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: August 22, 2017
    Assignee: Knowles Electronics, LLC
    Inventors: John Nielsen, Selvakumar Sivarajah, Aziz Yurrtas
  • Patent number: 9667173
    Abstract: An electrostatic ultrasonic transducer includes a first conductive layer; a second conductive layer spaced apart from the first conductive layer; and a third conductive layer disposed between the first and second conductive layers, the third conductive layer being spaced apart from the first conductive layer and in physical contact with a part of the second conductive layer.
    Type: Grant
    Filed: April 26, 2016
    Date of Patent: May 30, 2017
    Assignee: Turtle Beach Corporation
    Inventors: Brian Alan Kappus, Mark W. Norris, Elwood Grant Norris
  • Patent number: 9661422
    Abstract: This disclosure relates to loudspeakers that use one or more stacks of electrically actuated cards that pump air through vents to produce sound waves in response to an acoustic signal. Each stack can include several electrostatic actuator cards that are stacked on top of each other and collectively operate to pump air through a vent to produce a sound wave. Each card may include an electrically conductive membrane that is pushed/pulled between two electrically conductive stators. As the membrane is pushed and pulled along a first axis, air is pumped through vents in a direction orthogonal to the first axis. In one embodiment, stacks of cards can be arranged in series to increase sound pressure generated by the loud speaker. In another embodiment, a single stack of cards can be driven with relatively high electric field strength to increase the sound pressure generated by the loud speaker.
    Type: Grant
    Filed: June 9, 2015
    Date of Patent: May 23, 2017
    Assignee: BRANE AUDIO, LLC
    Inventors: Joseph F. Pinkerton, III, David A. Badger, William Neil Everett, William Martin Lackowski
  • Patent number: 9645019
    Abstract: A dielectric for a capacitive-based tactile sensor of the type having a pair of spaced apart conductive plates with the dielectric conductively therebetween, includes a body of a non-rigid dielectric polymeric material. The body is shaped into a microstructure defined by a plurality of members adapted to extend from one of the conductive plates to the other. Some of the members includes a first feature shaped to have a first end surface and a second end surface. Second features are integral with the first feature and project from the second end surface. A cross-section area of each of the second features is substantially smaller than a cross-section area of the first feature at the second end surface. A height of the first feature in a distance between the conductive plates is substantially greater than a height of the second features. A capacitive-based tactile sensor with the dielectric is also provided.
    Type: Grant
    Filed: January 21, 2014
    Date of Patent: May 9, 2017
    Assignee: KINOVA
    Inventors: Vincent Duchaine, Axaykumar Rana
  • Patent number: 9602930
    Abstract: A dual diaphragm microphone can be used to reduce or eliminate a component of the output signal due to acceleration of the microphone. The dual diaphragm microphone can include a first sound-detecting component including a first diaphragm spaced apart from a first electrode and configured to generate a first signal and a second sound-detecting component including a second diaphragm spaced apart from a second electrode and configured to generate a second signal. The first sound-detecting component and the second sound-detecting component are oriented in opposite directions and include electronic circuitry configured to sum the first and second output signals to generate a combined output signal substantially unaffected by acceleration of the microphone.
    Type: Grant
    Filed: March 31, 2015
    Date of Patent: March 21, 2017
    Assignee: Qualcomm Incorporated
    Inventor: Hyun Jin Park
  • Patent number: 9544679
    Abstract: Embodiments herein describe an audio system that adjusts based on the location of a person. That is, instead of relying on fixed speakers, the audio system adjusts the direction of audio output for one or more speakers to optimize the performance of the audio system based on the location of a user or based on the number of users. To do so, the audio system may include a camera and a tracking application which identifies the location of a user and/or the number of users in front of the camera. Using this information, the audio system adjusts one or more actuators coupled to a speaker to change the direction of the audio output of the speaker. As the user continues to move or shift, the audio system can continually adjust the speaker to optimize the performance of the system.
    Type: Grant
    Filed: December 8, 2014
    Date of Patent: January 10, 2017
    Assignee: HARMAN INTERNATIONAL INDUSTRIES, INC.
    Inventors: Christopher Michael Trestain, Bradford James Hamme
  • Patent number: 9540226
    Abstract: According to an embodiment, a microelectromechanical systems (MEMS) transducer includes a first electrode, a second electrode fixed to an anchor at a perimeter of the second electrode, and a mechanical support separate from the anchor at the perimeter of the second electrode and mechanically connected to the first electrode and the second electrode. The mechanical support is fixed to a portion of the second electrode such that, during operation, a maximum deflection of the second electrode occurs between the mechanical structure and the perimeter of the second electrode.
    Type: Grant
    Filed: May 20, 2015
    Date of Patent: January 10, 2017
    Assignee: Infineon Technologies AG
    Inventors: Wolfgang Klein, Martin Wurzer, Stefan Barzen, Alfons Dehe
  • Patent number: 9525944
    Abstract: An acoustic metamaterial including cells to digitally process an incoming sound waveform, and to produce a corresponding response sound waveform as a function of a frequency and a phase of the incoming sound waveform, to produce a total response sound waveform that, when combined with the incoming sound waveform, modifies the incoming sound waveform.
    Type: Grant
    Filed: August 5, 2014
    Date of Patent: December 20, 2016
    Assignee: THE BOEING COMPANY
    Inventor: Mark Joseph Clemen, Jr.
  • Patent number: 9516423
    Abstract: The disclosure relates to a micro-electromechanical membrane arrangement with a substrate, which has a multiplicity of recesses on a surface, a first electrically conductive electrode layer, which is arranged on the surface of the substrate and has a multiplicity of first depressions coinciding with the recesses, and an electrically conductive membrane layer, which can be deflected in a direction perpendicular to the active surface of the substrate, is arranged over the first electrode layer and is kept at a distance therefrom by a first distance value.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: December 6, 2016
    Assignee: Robert Bosch GmbH
    Inventors: Mike Daley, Rolf Scheben, Christoph Schelling
  • Patent number: 9363597
    Abstract: A hybrid ultrasonic audio system includes one or more ultrasonic speakers and one or more conventional speakers. An optical imaging system may be used to automatically determine the distance of a listener relative to the audio system. Channel processors apply distance-related transfer function filters to one or more of the audio channels based on the determined distances to equalize the amplitude of the audio played by the ultrasonic speakers relative to the conventional speakers. Channel processors may further apply a phase or time delay to the audio channels to match the phase and time delay of the ultrasonic speaker audio to the conventional speaker audio.
    Type: Grant
    Filed: August 21, 2014
    Date of Patent: June 7, 2016
    Assignee: Turtle Beach Corporation
    Inventors: Richard Joseph Kulavik, Elwood Grant Norris, Brian Alan Kappus
  • Patent number: 9266716
    Abstract: A microelectromechanical system (MEMS) microphone has a substrate including a backside trench, and a flexible membrane deposited on the substrate extending over the backside trench. The flexible membrane includes a first electrode. A silicon spacer layer is deposited on a perimeter portion of the flexible membrane. The spacer layer defines an acoustic chamber above the membrane and the backside trench. A silicon rich silicon nitride (SiN) backplate layer is deposited on top of the silicon spacer layer extending over the acoustic chamber. The backplate defines a plurality of opening into the acoustic chamber and includes a metallization that serves as a second electrode.
    Type: Grant
    Filed: March 12, 2014
    Date of Patent: February 23, 2016
    Assignee: Robert Bosch GmbH
    Inventors: Ando Feyh, Andrew Graham
  • Patent number: 9031266
    Abstract: An electrostatic loudspeaker comprises a membrane structure and an electrode structure. The membrane structure comprises a central membrane portion and a circumferential membrane portion. The electrode structure is configured to electrostatically interact with the membrane structure for causing a movement of the membrane structure along an axis of movement. The electrode structure comprises a circumferential electrode portion and an opening, the circumferential electrode portion being substantially aligned to the circumferential membrane portion and the opening being substantially aligned to the central membrane portion with respect to a direction parallel to the axis of movement. In an end position of the movement of the membrane structure, the central membrane portion is configured to extend at least partially through the opening. A method for operating an electrostatic loudspeaker and a method for manufacturing an electrostatic loudspeaker are also described.
    Type: Grant
    Filed: October 11, 2011
    Date of Patent: May 12, 2015
    Assignee: Infineon Technologies AG
    Inventors: Alfons Dehe, Mohsin Nawaz, Christoph Glacer
  • Patent number: 8958577
    Abstract: A system and method for modulating the sound pressure that is output from an audio transducer is disclosed. In one embodiment, the method includes receiving an audio signal and placing the audio signal across a voice coil of the transducer. In addition, a voltage is applied across a field coil of the transducer, the field coil being separate from the voice coil. And the voltage that is applied across the field coil is adjusted so as to modulate the sound pressure output from the audio transducer.
    Type: Grant
    Filed: November 4, 2011
    Date of Patent: February 17, 2015
    Assignee: FluxTone, Inc.
    Inventor: Stephen L. Carey
  • Patent number: 8953821
    Abstract: A parametric audio system having increased bandwidth for generating airborne audio signals with reduced distortion. The parametric audio system includes a modulator for modulating an ultrasonic carrier signal with a processed audio signal, a driver amplifier for amplifying the modulated carrier signal, and an array of acoustic transducers for projecting the modulated and amplified carrier signal through the air along a selected projection path to regenerate the audio signal. The acoustic transducer array includes a backplate having a succession of depressions formed thereon with at least one varying feature and/or dimension, and a membrane disposed along the backplate. The feature and/or dimension of the respective depressions vary so that the center frequencies of the respective acoustic transducers span a desired frequency range, thereby broadening the frequency response of the acoustic transducer array.
    Type: Grant
    Filed: June 20, 2008
    Date of Patent: February 10, 2015
    Inventor: Frank Joseph Pompei
  • Patent number: 8897465
    Abstract: A micro-speaker. The micro-speaker includes a first plate, a second plate, and a diaphragm. The first plate is biased to a first voltage. The second plate is biased to a second voltage. The diaphragm is positioned between the first plate and the second plate and is configured to receive a digital signal. The digital signal causes the diaphragm to cycle between fully displaced toward the first plate and fully displaced toward the second plate, creating air pressure pulses that mimic the digital signal.
    Type: Grant
    Filed: June 1, 2011
    Date of Patent: November 25, 2014
    Assignee: Robert Bosch GmbH
    Inventor: John M. Muza
  • Publication number: 20140328501
    Abstract: The invention is directed to systems, methods and computer program products associated with a microphone system for receiving a sound and producing an output signal representing the sound. The microphone system has a first microphone having a first dynamic range, the first microphone to receive the sound and produce a first sound signal based on the received sound. It also has a second microphone having a second dynamic range, the second microphone to receive the sound and produce a second sound signal based on the received sound, wherein the first dynamic range and the second dynamic range overlap thereby forming a transition dynamic range and processing logic operatively coupled to the first microphone and the second microphone. The processing logic is configured to receive the first sound signal from the first microphone, receive the second sound signal from the second microphone, and generate the output signal by combining the first sound signal and the second sound signal.
    Type: Application
    Filed: January 17, 2012
    Publication date: November 6, 2014
    Applicant: SONY MOBILE COMMUNICATIONS AB
    Inventor: Martin Nystrom
  • Patent number: 8831248
    Abstract: A loudspeaker is described. The loudspeaker includes two or more segmentations of a planar radiator. Each of the segmentations has an associated frequency dependent velocity magnitude and phase with substantially uniform surface pressure. The two or more segmentations provide a substantially uniform radiation pattern across a wide range of acoustic frequencies. Apparatus, computer readable media and methods are also described.
    Type: Grant
    Filed: August 4, 2011
    Date of Patent: September 9, 2014
    Assignee: Nokia Corporation
    Inventors: Timothy J. Mellow, Leo M. J. Karkkainen
  • Patent number: 8831243
    Abstract: The present invention discloses a driving circuit for electronic horn and a driving method for the electronic horn. The driving circuit includes an oscillating circuit, which generates a signal having oscillating frequency. Based on the signal, said driving circuit generates a driving signal to drive the electronic horn to produce sound. It is characterized in that said oscillating circuit includes a variable capacitor, and the oscillating frequency is changed by adjusting capacitance of the variable capacitor so as for the frequency of the driving signal to be consistent with working frequency of the electronic horn. The present invention overcomes the problem of mismatch between the frequency of circuit's driving signal and the horn's sounding diaphragm and horn's tone inflexion due to resistance change caused by vehicle vibration.
    Type: Grant
    Filed: February 13, 2006
    Date of Patent: September 9, 2014
    Inventor: Yu Wan
  • Patent number: 8769803
    Abstract: Provided is a method of manufacturing a loudspeaker including assembling a magnetic circuit and a frame. In the step of assembling the magnetic circuit and the frame, parallelism between a plate and a damper attachment portion of the frame is ensured by bringing an upper portion of the plate and the damper attachment portion of the frame into contact with a jig. In addition, perpendicularity between a magnetic gap and the damper attachment portion of the frame is ensured by bringing an outer circumferential side portion of the plate of the magnetic gap and an inner circumferential side portion of the yoke into contact with the jig. The magnetic circuit and the frame are assembled in such a state. With such a manufacturing method, it is possible to achieve a superior loudspeaker capable of reducing a gap defect while being downsized and having increased maximum input power.
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: July 8, 2014
    Assignee: Panasonic Corporation
    Inventors: Toshiyuki Koike, Shinsaku Sawa, Tadashi Akiyama
  • Patent number: 8755539
    Abstract: An electrostatic transducer loudspeaker includes a filterless class-D amplifier to modulate an audio input signal to generate a modulated signal containing a PWM switching carrier component, and a transformer directly connected at an output side of the filterless class-D amplifier and directly connected at an input side of an electrostatic transducer, whereby the equivalent capacitance of the electrostatic transducer and the equivalent inductance of the transformer establish a resonance circuit to demodulate the modulated signal to generate an AC voltage to drive the electrostatic transducer.
    Type: Grant
    Filed: November 16, 2010
    Date of Patent: June 17, 2014
    Assignee: Richtek Technology Corp.
    Inventors: Pei-Cheng Huang, Jwin-Yen Guo
  • Publication number: 20140126749
    Abstract: The present invention discloses a flat speaker output device and a method for starting the same. Wherein, a plurality of flat speakers utilizes an initial delay unit and a plurality of intermediary delay units connected in series. The initial delay unit connects with the power controller and a first one of the flat speakers. The intermediary delay units respectively connect with the residual each flat speakers. The power controller controls a power source to the initial delay unit to delay the start of the first one of flat speakers, and outputs the power source to the intermediary delay units to sequentially delay the starts time of the residual each flat speaker. The present invention can sequentially start flat speakers without using a high-output power supply device and thus decrease the required capacity of the external power supply device.
    Type: Application
    Filed: February 5, 2013
    Publication date: May 8, 2014
    Applicant: AMAZING MIRCOELECTRONIC CORP.
    Inventor: Ming Che HSIEH
  • Patent number: 8693708
    Abstract: A backup alarm for producing an audible warning signal which warbles or beeps, at selected audible output power (Db) levels includes a computer which drives a speaker by switching drive voltage to the speaker with above audible, high frequency pulses in packets repetitive at audible frequency. The high frequency pulses are pulse width modulated at different ratios selected from tables in memory of the computer in accordance with the voltage from a battery power source which provides the drive voltage so that the audible output power remains constant at the selected level over a wide range of power source voltage. By providing for warning/alarm signal generation by means of an operating system which provides both high, above audible frequency and audible frequency switching, power conservation and warning signal output power control are accomplished without interference.
    Type: Grant
    Filed: August 24, 2010
    Date of Patent: April 8, 2014
    Assignee: Star Headlight & Lantern Co., Inc.
    Inventor: James J. Cronmiller
  • Patent number: 8590136
    Abstract: A dual backplate MEMS microphone system including a flexible diaphragm sandwiched between two single-crystal silicon backplates may be formed by fabricating each backplate in a separate wafer, and then transferring one backplate from its wafer to the other wafer, to form two separate capacitors with the diaphragm.
    Type: Grant
    Filed: August 27, 2010
    Date of Patent: November 26, 2013
    Assignee: Analog Devices, Inc.
    Inventors: Kuang L. Yang, Li Chen, Thomas D. Chen
  • Patent number: 8588438
    Abstract: A driving interface device adaptive to a flat speaker is introduced herein. The driving interface device is coupled with an external sound source for receiving sound signals, and boosts voltage levels of the sound signals to drive the thin flat speaker without using an external power source. In one embodiment, an impedance component is provided in the driving interface device for coupling to the external sound source, so as to drive the flat speaker.
    Type: Grant
    Filed: December 30, 2010
    Date of Patent: November 19, 2013
    Assignee: Industrial Technology Research Institute
    Inventors: Kuo-Hua Tseng, Chang-Ho Liou, Ming-Daw Chen, Kuan-Wei Chen, Che-Yuan Sun
  • Patent number: 8503693
    Abstract: A system and method for sensing acoustic sounds is provided having at least one directional sensor, each directional sensor including at least two compliant membranes for moving in reaction to an excitation acoustic signal and at least one compliant bridge. Each bridge is coupled to at least a respective first and second membrane of the at least two membranes for moving in response to movement of the membranes it is coupled to for causing movement of the first membrane to be related to movement of the second membrane when either of the first and second membranes moves in response to excitation by the excitation signal. The directional sensor is controllably rotated to locate a source of the excitation signal, including determining a turning angle based on a linear relationship between the directionality information and sound source position described in experimentally calibrated data.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: August 6, 2013
    Assignee: University of Maryland
    Inventors: Miao Yu, Haijun Liu
  • Patent number: 8379882
    Abstract: An electronic device includes a capacitance electro-acoustic transducer and an audio driver. The audio driver is coupled to the capacitance electro-acoustic transducer. The audio driver includes a high-voltage amplifier for receiving an input audio signal and for transforming the input audio signal into an output audio signal to drive the capacitance electro-acoustic transducer, wherein an absolute voltage value of the input audio signal is smaller than an absolute voltage value of the output audio signal. The output bandwidth of the capacitance electro-acoustic transducer is controlled by the magnitude of the output current of the audio driver. The capacitance electro-acoustic transducer of the present invention can meet different bandwidth requirements and thus achieve saving power, which cannot be achieved by a traditional dynamic electro-acoustic transducer.
    Type: Grant
    Filed: June 14, 2009
    Date of Patent: February 19, 2013
    Assignee: HTC Corporation
    Inventor: Fang-Ching Lee
  • Patent number: 8379888
    Abstract: A sound-generating device comprises a first enclosure having at least one first electrode and a first piezoelectric layer, a first terminal of an audio signal output being coupled to the at least one first electrode of the first enclosure, a second enclosure having at least one first electrode and a first piezoelectric layer, and a first bendable element coupled between the first and second enclosures. The at least one first electrode is coupled with the first terminal of the audio signal output. The first piezoelectric layer of the first enclosure and the first piezoelectric layer of the second enclosure are configured to respond to the signal supplied by the audio signal output and to generate sound waves.
    Type: Grant
    Filed: July 8, 2008
    Date of Patent: February 19, 2013
    Assignee: National Taiwan University
    Inventors: Chih-Kung Lee, Wen-Ching Ko, Jia-Lun Chen, Wen-Hsin Hsiao, Wen-Jong Wu
  • Patent number: 8369546
    Abstract: An ultrasonic transducer having a reduced cost of manufacture. The ultrasonic transducer includes a first insulative retaining layer, a second insulative retaining layer, and a vibrator film layer sandwiched between the first and second retaining layers. The first retaining layer includes a first plurality of apertures formed therethrough, and the second retaining layer includes a second plurality of apertures formed therethrough, in which the second apertures are substantially in registration with the first apertures. The ultrasonic transducer further includes a first cover portion having a plurality of spring/backplate assemblies connected thereto, and a second cover portion. The combination of the first retaining layer, the vibrator film layer, and the second retaining layer is sandwiched between the first and second cover portions of the ultrasonic transducer.
    Type: Grant
    Filed: January 29, 2010
    Date of Patent: February 5, 2013
    Inventor: Frank Joseph Pompei
  • Patent number: 8327521
    Abstract: Methods are provided for production of pre-collapsed capacitive micro-machined ultrasonic transducers (cMUTs). Methods disclosed generally include the steps of obtaining a nearly completed traditional cMUT structure prior to etching and sealing the membrane, defining holes through the membrane of the cMUT structure for each electrode ring fixed relative to the top face of the membrane, applying a bias voltage across the membrane and substrate of the cMUT structure so as to collapse the areas of the membrane proximate to the holes to or toward the substrate, fixing and sealing the collapsed areas of the membrane to the substrate by applying an encasing layer, and discontinuing or reducing the bias voltage. CMUT assemblies are provided, including packaged assemblies, integrated assemblies with an integrated circuit/chip (e.g., a beam-steering chip) and a cMUT/lens assembly. Advantageous cMUT-based applications utilizing the disclosed pre-collapsed cMUTs are also provided, e.g.
    Type: Grant
    Filed: September 17, 2008
    Date of Patent: December 11, 2012
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Peter Dirksen, Anthonie Van Der Lugt
  • Patent number: 8306244
    Abstract: A digital sound system suitable for a digital speaker device for directly converting analog sound by a circuit using a ?? modulator and a mismatch shaping filter circuit to output a plurality of digital signals and a plurality of speakers driven by the plurality of digital signals. A digital speaker driving device includes a ?? modulator, a post filter, s driving circuits, and a power supply circuit to supply power to the ?? modulator, the post filter and the s driving elements and the s driving circuits are adapted to s digital signal terminals.
    Type: Grant
    Filed: March 22, 2010
    Date of Patent: November 6, 2012
    Assignee: Trigence Semiconductor, Inc.
    Inventors: Jun-ichi Okamura, Akira Yasuda
  • Patent number: 8284964
    Abstract: A compound membrane (100) for an acoustic device (200), the compound membrane (100) comprising a first layer (101) and a second layer (102), wherein a value of Young's modulus of the second layer (102) does not vary more than essentially 30% in a temperature range between essentially ?20° C. and essentially +85° C.
    Type: Grant
    Filed: October 16, 2007
    Date of Patent: October 9, 2012
    Assignee: Knowles Electronics Asia PTE. Ltd.
    Inventors: Susanne Windischberger, Josef Lutz, Ewald Frasl
  • Patent number: 8238580
    Abstract: The present invention provides a module for a powered speaker, such as a subwoofer that may be actuated to turn the speaker on and off remotely by energizing the auxiliary AC power supply provided with an audio device or other source unit. The main power of the module is provided via a wall outlet or suitable power supply that may adequately supply the necessary power.
    Type: Grant
    Filed: October 17, 2005
    Date of Patent: August 7, 2012
    Inventor: Richard Hofrichter
  • Patent number: 8238581
    Abstract: The present invention provides a powered speaker, such as a subwoofer that may be turned on and off remotely by energizing the auxiliary AC power supply provided with an audio device or other source unit. The main power of the powered subwoofer is provided via a wall outlet or suitable power supply that may adequately supply the necessary power.
    Type: Grant
    Filed: October 17, 2005
    Date of Patent: August 7, 2012
    Inventor: Richard Hofrichter
  • Patent number: 8204260
    Abstract: The present invention provides a sound producing apparatus which suppresses an increase in electric power consumption and cost, and an increase in a number of wiring when a plurality of speaker apparatuses is configured. A speaker driving apparatus supplies electric power to a speaker apparatus, acquires information about an electroacoustic characteristic and maximum input electric power of each speaker apparatus from the speaker apparatus, and executes characteristic correction and output electric power restriction according to the information.
    Type: Grant
    Filed: January 16, 2008
    Date of Patent: June 19, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventor: Noriaki Suzuki
  • Publication number: 20120148071
    Abstract: A digital loudspeaker includes a substrate, a first stator fixed with respect to the substrate, a second stator fixed with respect to the substrate and spaced at a distance from the first stator, and a membrane between the first stator and the second stator. The membrane is displaceable between a first position in which the membrane mechanically contacts the first stator and a second position in which the membrane mechanically contacts the second stator. The first stator and the second stator are arranged to electrostatically move the membrane from a rest position spaced apart from the first position and the second position to the first position and the second position, respectively.
    Type: Application
    Filed: December 10, 2010
    Publication date: June 14, 2012
    Inventor: Alfons Dehe
  • Patent number: 8184833
    Abstract: A speaker is integrally formed with a multi-layered printed circuit board. The printed circuit board includes a flexible membrane layer with a conductive pattern thereon. Positive and negative elements are disposed on opposing sides of the flexible membrane. A drive circuit connects to the flexible membrane layer and applies current to the flexible membrane layer responsive to an audio signal to generate audible sounds.
    Type: Grant
    Filed: December 14, 2007
    Date of Patent: May 22, 2012
    Assignee: Sony Ericsson Mobile Communications AB
    Inventor: Randolph Cary Demuynck
  • Patent number: 8175294
    Abstract: An electrostatic loudspeaker includes a front stator, first and second substantially conductive diaphragms, a center stator and a back stator. The front stator is connected to a safe reference potential such as earth ground. The first diaphragm, the center stator and the back stator are connected to individual positive, non equal DC bias voltages, referenced to the front stator. The second diaphragm is connected to a negative DC bias voltage. A high voltage audio signal, which is referenced to the front stator, is superimposed to the bias voltage of the center stator. The electrostatic loudspeaker can be driven by a single ended audio source. The electrostatic loudspeaker further features an improved electrical safety level.
    Type: Grant
    Filed: May 2, 2008
    Date of Patent: May 8, 2012
    Inventor: Arian M. Jansen
  • Patent number: 8150091
    Abstract: A flat-panel speaker is attached to an exterior surface of a printed circuit board (PCB) housed within a consumer electronic device. Rather than place the flat-panel speaker within a sealed speaker box and then attach the speaker box to the PCB, as is conventional, the present invention attaches the flat-panel speaker to the exterior surface of the PCB without the speaker box. Removing the speaker box allows designers to reduce the dimensions of the device, and to minimize the complexity of the device.
    Type: Grant
    Filed: December 14, 2007
    Date of Patent: April 3, 2012
    Assignee: Sony Ericsson Mobile Communications AB
    Inventors: William Chris Eaton, Eric Douglas Romesburg
  • Patent number: 8130973
    Abstract: A superdirectional acoustic system for reproducing a sound signal supplied from a real sound source by using a superdirectional speaker and producing a virtual sound source in a vicinity of a sound wave reflection surface. The system includes an ultrasonic speaker, which includes an ultrasonic transducer for oscillating a sound wave in an ultrasonic frequency band, for reproducing an audio signal in a relatively medium to high frequency sound range, which is included in the sound signal supplied from the real sound source; and a low frequency sound reproducing speaker for reproducing an audio signal in a relatively low frequency sound range, which is included in the sound signal supplied from the real sound source. Sound in the medium-high frequency range is reproduced in a manner such that the sound is produced from a virtual sound source which is formed in the vicinity of the sound signal reflection surface such as a screen.
    Type: Grant
    Filed: June 20, 2005
    Date of Patent: March 6, 2012
    Assignee: Seiko Epson Corporation
    Inventors: Akihito Uetake, Kinya Matsuzawa
  • Patent number: 8126171
    Abstract: An electrostatic ultrasonic transducer includes a first electrode that has through-holes, a second electrode that has through-holes, and a vibrating membrane that is disposed such that the through-holes of the first electrode and the through-holes of the second electrode form a pair, interposed between a pair of electrodes composed of the first electrode and the second electrode, and having a conductive layer applied with a direct current bias voltage. The first electrode and the second electrode each have counter electrode portions that are formed in the through-holes to face the vibrating membrane, and a modulated wave, which is obtained by modulating a carrier wave in an ultrasonic frequency band with a signal wave in an audible frequency band, is applied between the pair of electrodes.
    Type: Grant
    Filed: February 21, 2007
    Date of Patent: February 28, 2012
    Assignee: Seiko Epson Corporation
    Inventors: Hirokazu Sekino, Kinya Matsuzawa, Hideki Kojima
  • Patent number: 8121315
    Abstract: Disclosed is a condenser microphone chip, comprising: a substrate (21); a diaphragm (26) spaced from the substrate; a curved beam (27) connected with the diaphragm (26) to anchor the diaphragm (26) to the substrate (21); a curved beam connecting part (29) having a shape of a substantially circular plate. The curved beam (27) is arranged in the diaphragm (26). The curved beam (27) includes a plurality of sub beams, each of the plurality of sub beams including a first sub beam portion extending in a substantially radial direction from a circumference of the curved beam connecting part (29); a second sub beam portion extending in a substantially circumferential direction from an end of the first sub beam portion away from the circumference of the curved beam connecting part (29) and having a shape of a substantial arc; and a third sub beam portion extending in the radial direction from an end of the second sub beam portion away from the first sub beam portion and connected to the diaphragm (26).
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: February 21, 2012
    Assignee: Goer Tek Inc.
    Inventors: Qinglin Song, Yongchun Tao, Shengli Pang, Tongqing Liu
  • Patent number: 8103037
    Abstract: A system for producing parameters for a bass-enhanced loudspeaker enclosure; meanwhile, a low-frequency extended frequency, a quality and quantity ratio and radius of a port need to be defined for the system. Also, the resonance frequency of a mechanical system and the quality and quantity of a mechanical system are fixed to obtain the parameters for the frequency ratio, the length of the duct and the cavity volume inside the device, etc. and to manufacture the bass-enhanced loudspeaker enclosure.
    Type: Grant
    Filed: February 21, 2008
    Date of Patent: January 24, 2012
    Assignee: National Chiao Tung University
    Inventors: Ming-Sian R. Bai, Huan-Sheng Zhang, Rong-Liang Chen
  • Patent number: 8085957
    Abstract: The invention relates to electroacoustic engineering, in particular to methods for converting electric signals into acoustic oscillations and to electroacoustic transducers. The method for converting electric signals into acoustic oscillations comprises exposing an oscillating system that is a gas medium pre-structured by a static electric field to an electric/electromagnetic field modulated in strength by an alternating electric signal in accordance with the shape and frequency of the modulating signal, and converting the energy of the field into acoustic energy to be released thereupon into the ambient. An electric gas-kinetic transducer developed to perform this method comprises a dielectric working element and at least two current-conducting plates that can be connected to the pole terminals of a direct voltage source and to a source of alternating electric signals.
    Type: Grant
    Filed: November 10, 2006
    Date of Patent: December 27, 2011
    Inventors: Sergey Vladimirovich Shishov, Sergey Alexandrovich Andrianov, Sergey Pavlovich Dmitriev, Dmitriy Victorovich Ruchkin