Front Wave Patents (Class 381/350)
  • Patent number: 10123131
    Abstract: Microelectromechanical microphones include structures that permit differential capacitive sensing. In certain structures, a movable plate is disposed between a rigid plate and a substrate. A first capacitor is formed between the movable plate and the substrate and a second capacitor is formed between the movable plate and the rigid plate. Respective bias voltages can be applied to the rigid plate and the substrate, and a differential capacitive signal can be probed in response to displacement of the movable plate caused by a pressure wave. The movable plate and the rigid plate are mechanically coupled to first and second portions of the substrate, respectively. A dielectric member mechanically couples the movable plate and the rigid plate, thus providing mechanical stability.
    Type: Grant
    Filed: June 8, 2015
    Date of Patent: November 6, 2018
    Assignee: INVENSENSE, INC.
    Inventors: Fang Liu, Michael Daneman, Thomas Chen
  • Patent number: 9980036
    Abstract: A passive radiator is provided for use in a loudspeaker system in which the passive radiator and a driver are connected to one another within a speaker enclosure by an acoustic coupler having a coupler opening such that the driver and the passive radiator are located in different planes.
    Type: Grant
    Filed: April 4, 2017
    Date of Patent: May 22, 2018
    Assignee: JL Audio, Inc.
    Inventor: Lucio Proni
  • Patent number: 9800970
    Abstract: A loudspeaker system is provided in which a passive radiator and a driver are connected to one another within a speaker enclosure by an acoustic coupler having a coupler opening such that the driver and the passive radiator are located in different planes.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: October 24, 2017
    Assignee: JL Audio, Inc.
    Inventor: Lucio Proni
  • Patent number: 8917894
    Abstract: Earpieces and methods for acute sound detection and reproduction are provided. A method can include measuring an ambient sound level external to an ear canal at least partially occluded by the earpiece, monitoring a change in the ambient sound level for detecting an acute sound, estimating a proximity of the acute sound, and reproducing the acute sound within the ear canal responsive to detecting the acute sound and the proximity.
    Type: Grant
    Filed: January 22, 2008
    Date of Patent: December 23, 2014
    Assignee: Personics Holdings, LLC.
    Inventors: Steven Wayne Goldstein, Marc Andre Boillot, John Usher
  • Patent number: 8917875
    Abstract: A circuit for operating loudspeakers includes a first, second, third and fourth loudspeaker circuit, having one input each for injecting a signal and one output each for connecting a loudspeaker input. The loudspeaker circuits are designed to amplify the injected signal and to provide the amplified signal at the outputs thereof. The loudspeaker circuits can, for example, be used for a 2.1 sound system. The three channels for a 2.1 sound system can be implemented by an amplifier circuit with four loudspeaker circuits, one loudspeaker circuit each being required for the two stereo channels left and right. A subwoofer channel can be driven differentially by two loudspeaker circuits. The stereo channels are, by contrast, only still connected to one loudspeaker circuit each, and so the stereo channels require at least one further common ground cable.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: December 23, 2014
    Assignee: Infineon Technologies AG
    Inventors: Christoph Braun, Thomas Duda, Torsten Hinz
  • Publication number: 20130170689
    Abstract: The invention provides in some aspects a loudspeaker comprising an enclosure, a driver that is mounted in the enclosure, and an active diaphragm that is coupled to the driver to generate frontward-directed sound waves (“front waves”) directed outwardly from the enclosure and backward-directed sound waves (“back waves”) directed inwardly into the enclosure. A foam member, disposed within the enclosure and/or on an inner surface of a wall thereof, attenuates components of the back wave as a function of frequency, e.g., in the manner of a low-pass filter. The foam member comprises a foam of rigid material, namely, by way of example, a foam of metal, ceramic, carbon, silicon, glass, and/or epoxy.
    Type: Application
    Filed: July 25, 2012
    Publication date: July 4, 2013
    Applicant: DR. G LICENSING, LLC
    Inventor: Godehard A. Guenther
  • Patent number: 8401216
    Abstract: The present invention is an acoustic traveling wave tube system for propagating a directional acoustic wave comprising an acoustic traveling wave tube having a cylindrical shape with a load on one end of the tube, a plurality of excitation rings positioned around a circumference of the tube and spaced at predetermined intervals along a length of the tube and a microprocessor having a database containing a plurality of waveforms representative of acoustic signals. The microprocessor energizes one of the plurality of excitation rings to form an acoustic wave, sequentially energizes one or more of the remaining excitation rings along the length of the tube to amplify the acoustic wave as the acoustic wave travels along the length of the tube, and propagates the acoustic wave from an end of the tube opposite the load as a shaped directional acoustic wave.
    Type: Grant
    Filed: October 26, 2010
    Date of Patent: March 19, 2013
    Assignee: Saab Sensis Corporation
    Inventors: John A. Rougas, Pasquale Dinovo
  • Patent number: 8238595
    Abstract: A speaker component for a portable electronic device which accepts a receiver and redirects the sound emitted from the receiver toward the speaker hole in the device housing is disclosed. The receiver may be oriented such that sound is directed away from the speaker hole to reduce the footprint of the receiver within the device housing. A channel of the speaker component may redirect or port the sound to the speaker hole. Accordingly, embodiments provide more flexibility for positioning of the speaker hole and the receiver with respect to the device housing. The speaker component may also have a self-contained back volume chamber adjoining the receiver which does not include portions of the device housing or other components of the portable electronic device, thereby improving the sound quality of the sound emitted from the receiver and providing more flexibility as to the size and shape of the back volume chamber.
    Type: Grant
    Filed: January 7, 2009
    Date of Patent: August 7, 2012
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Ronald Jeffrey Horowitz, Michael Francisco, Giancarlo Anthony Giustina
  • Patent number: 8141675
    Abstract: A micro-speaker includes a frame, a case supported by the frame, a sound generator located between the frame and the case. The case has a sound hole and a peripheral plate surrounding the sound hole. The peripheral plate includes an outer surface, an inner surface and an inclining surface extending from the inner surface toward the outer surface.
    Type: Grant
    Filed: January 31, 2010
    Date of Patent: March 27, 2012
    Assignees: AAC Acoustic Technologies (Shenzhen) Co. Ltd., American Audio Components Inc.
    Inventors: Qian Xu, Jing He
  • Patent number: 8111836
    Abstract: A performance venue with a main speaker system is provided having a target coverage area within the performance venue. A performance area is located within the performance venue outside the target coverage area of the main speaker system. A low frequency directed audio source is positioned with respect to the performance area for active cancellation of low frequency sound spilling over into the performance area from the main speaker system. Control of the low frequency directed audio source is effected by an audio sensor is located in the performance area for generating an output correlated with low frequency spill over into the performance area.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: February 7, 2012
    Inventor: Curtis E. Graber
  • Patent number: 7711135
    Abstract: In order to divide the inside space of the cabinet into at least two with a speaker being the center, obtain a plurality of emitted sound energies through openings constructed in each divided sphere, and utilize a cabinet of a loudspeaker apparatus as a sound echo box, a partition wall 4 is disposed at a right angle to a baffle board 2 or a front board 7, passing through the center O of a speaker 3 disposed on the baffle board 2 or the front board 7 of the cabinet 6, and divides the inside space of the cabinet 6 into at least two of an upper chamber 11U and a lower chamber 11D, so that sound energies are emitted from openings 8 and 9 which are provided in each chamber of 11D and 11U, respectively.
    Type: Grant
    Filed: April 30, 2002
    Date of Patent: May 4, 2010
    Inventor: Teruo Tsutsumi
  • Patent number: 7596236
    Abstract: The invention concerns a mobile membrane loudspeaker equipped with a partial closure optimising its radiation. The invention is characterised in that the loudspeaker with mobile diaphragm (19) attached to a rigid frame (15) defining an acoustic emission plane (P) comprises a closure (25) for only one central zone of said emission plane.
    Type: Grant
    Filed: July 22, 2002
    Date of Patent: September 29, 2009
    Assignee: Nexo
    Inventor: Eric Vincenot
  • Patent number: 7466837
    Abstract: A spherical wave generating diffuser positioned in front of the sound emission side of a sound source. The diffuser comprises an inner horn and an outer horn positioned concentrically around the inner horn. The diffuser generates pseudo-spherical waves centered on the inner horn because the emission speed of the sound waves emitted from between the outer horn and the inner horn are slower than the emission speed of sound waves emitted from within the inner horn.
    Type: Grant
    Filed: July 27, 2004
    Date of Patent: December 16, 2008
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Takeshi Nakamura
  • Patent number: 7463746
    Abstract: A loudspeaker system having an enclosure having a narrow opening or slot for radiating high frequency acoustic energy. The loudspeaker system has a cover member defining a slot between the cover member and a boundary of a listening space. The loudspeaker system may also include a fixed or adaptive equalizer for modifying frequency response anomalies resulting from the interaction of the acoustic energy, the narrow opening, and the boundary.
    Type: Grant
    Filed: March 31, 2003
    Date of Patent: December 9, 2008
    Assignee: Bose Corporation
    Inventors: Gerald F. Caron, George E. P. Chute, Allan S. Copeland, Eric J. Freeman, Doug Kramer
  • Patent number: 7416048
    Abstract: A portable terminal apparatus with a telephone function such as a portable telephone, for efficiently emitting a voice from a speaker from both a front face and a backside of a housing. The portable terminal has: a first cover that includes a first sound outlet for emitting a sound from the speaker through the front of the portable terminal apparatus; a second cover that includes a second sound outlet for emitting a sound from the speaker through the back of the portable terminal apparatus; and a gasket accommodated at a position sandwiched between the first cover and the speaker.
    Type: Grant
    Filed: November 12, 2004
    Date of Patent: August 26, 2008
    Assignee: Fujitsu Limited
    Inventors: Manabu Hongo, Yoshiaki Kato, Nariyasu Hayakawa, Toshikazu Ishioka, Hiroaki Sakashita, Yoshifumi Kajiwara, Hidehiko Hizuka
  • Publication number: 20080144873
    Abstract: A loudspeaker system includes an enclosure having an open end defining a plane, a baffle, a loudspeaker operating in the 4 kHz to 10 kHz range, and a device, preferably a ribbed portion having a plurality of grooves, coupled to the baffle for modifying the spectral profile of the projected sound waves. The baffle includes first and second angled surfaces each oriented at an oblique angle with respect to the plane. The speaker is coupled to the first angled surface and the ribbed portion is coupled to the baffle along the intersection of the first angled surface and the second angled surface. When mounted in a wall or ceiling, the system projects a sound field substantially indistinguishable from that of a loudspeaker located within the listener's listening plane. The baffle can also have acoustic damping material attached thereto, with grooves formed therein, to prevent reflections of 4 kHz to 10 kHz sound.
    Type: Application
    Filed: December 18, 2006
    Publication date: June 19, 2008
    Inventors: Matthew Grant, Timothy A. Gladwin, Robert G. Johnston
  • Patent number: 7382890
    Abstract: A sound reproduction device includes an LCD 20, which is an exemplary front panel, a case 22, and an electromechanical acoustic transducer 23. The LCD 20 is operable to perform a predetermined operation in response to an electrical signal applied thereto. A space 24 for sound emission is formed between the case 22 and the LCD 20. The electromechanical acoustic transducer 23 is connected to the case 22, and emits sound to the space 24. If the electromechanical acoustic transducer 23 emits the sound to the space 24, energy of the emitted sound causes the LCD 20 to vibrate and thereby to externally output the sound.
    Type: Grant
    Filed: July 29, 2004
    Date of Patent: June 3, 2008
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Shuji Saiki, Sawako Usuki
  • Patent number: 7324654
    Abstract: A system is disclosed for changing a coverage angle of sound produced from a loudspeaker system. The loudspeaker system includes an enclosure that projects sound at a predetermined angle. A sound integrator includes an inner surface positioned adjacent to a mid-range frequency sound source. An outer surface of the sound integrator includes a planar and a curved surface. The surfaces control the angle which sound radiates from the loudspeaker.
    Type: Grant
    Filed: July 1, 2003
    Date of Patent: January 29, 2008
    Assignee: Harman International Industries, Inc.
    Inventors: Scott M. Opie, Mark E. Engebretson, Yoshiyuki Takeuchi
  • Publication number: 20070242844
    Abstract: An acoustic transducer, specifically an electrostatic loudspeaker (ESL) providing curvature in two directions for improved dispersion of sound waves. The compound curvature also provides a virtual focus of the propagated sound waves for accurate reproduction of musical program material recorded with standard single-point microphones. The highly directional nature of high frequency sound waves requires that a flat or cylindrical electrostatic transducer must be physically tall to allow a listener to either recline or stand. The two-axis curved structure enables a compact form of ESL to be realized, including bookshelf type loudspeakers whereas all known commercial units are comparable in height to that of a human listener. The individual curved ESL panels can also be readily combined to create larger transducer assemblies including omni-directional units.
    Type: Application
    Filed: April 12, 2007
    Publication date: October 18, 2007
    Inventor: MURRAY R. HARMAN
  • Patent number: 7269270
    Abstract: The frequency at which standing waves occur in a loudspeaker enclosure may be reduced by the addition of an internal barrier to the enclosure in order to lengthen the effective length of an internal dimension of the enclosure. Additionally, the internal barrier may be configured such that it forms a resistive coupling between two sides of the barrier. By configuring the internal barrier to form a resistive coupling, aberrations in the frequency response of the loudspeaker caused by certain standing waves may be dampened.
    Type: Grant
    Filed: October 17, 2002
    Date of Patent: September 11, 2007
    Assignee: Bose Corporation
    Inventors: Eric J. Freeman, Timothy Holl
  • Patent number: 7068979
    Abstract: A mobile telecommunications device is disclosed and comprises a casing (2), an earpiece (6), and a cover (33) associated with the earpiece (6) to define a resonant cavity (34) between the earpiece (6) and the casing (2), wherein the cover (33) has an opening therein for the transmission of sound from the earpiece (6) via the cavity (34) into an acoustic path formed between the casing (2) and the cover (33).
    Type: Grant
    Filed: November 27, 2001
    Date of Patent: June 27, 2006
    Assignee: Nokia Corporation
    Inventors: Per Pedersen, Alireza Asadi Sohi, Jens Madsen, Kenn Berend Pedersen, Per Højlev
  • Patent number: 6996243
    Abstract: The loudspeaker and method provide a driver of a loudspeaker that is movable parallel to an axis of movement through a center of the driver to produce sound waves. The driver is aligned with the driver plane orthogonal to the axis of movement. The driver plane is at a non-zero acute angle to a support plane. A reflector is mounted facing a diaphragm of the driver for reflecting sound waves from the driver. The reflector is configured relative to the driver such that reflected sound energy is greatest in a selected direction from a front of the reflector and the driver, and diminishes a progressively larger angle from the selected direction. The selected direction diverges from the driver plane.
    Type: Grant
    Filed: March 4, 2003
    Date of Patent: February 7, 2006
    Assignee: Audio Products International Corp.
    Inventors: Andrew C. Welker, John Tchilinguirian
  • Patent number: 6931143
    Abstract: An electroacoustical transducer has an enclosure having a thickness substantially smaller than the width and the depth. The transducer includes a first rigid sheet, a second rigid sheet, and a spacing structure for spacing the first rigid sheet from the second rigid sheet to define an acoustic enclosure, having a top, a bottom and a side edge. The top includes the first rigid sheet and the bottom includes the second rigid sheet. The transducer includes an acoustic transducer for exchanging sound waves with the acoustic enclosure. The enclosure has a plurality of outlet points.
    Type: Grant
    Filed: July 30, 2002
    Date of Patent: August 16, 2005
    Assignee: Bose Corporation
    Inventors: Gerald F. Caron, Jeffrey Hoefler, Christopher B. Ickler, Roberto M. Dizon
  • Patent number: 6859543
    Abstract: A speaker system and related method for making the same include a rigid, cylindrically shaped body member with opposite ends and a hollow interior which defines a sound chamber. A base is connected with one end of the body member to support the speaker system within a building room. A high-range speaker is mounted in the sound chamber, with a diaphragm portion located within a first radial opening in the body member to direct high-range sound radially toward the listener. A bass port is mounted in a second radial opening in the body member opposite the high-range speaker, and directs low-range sound in the sound chamber radially toward the listener. A head is mounted on the end of the body member opposite the base member, and includes a mid-bass speaker with a diaphragm oriented axially outwardly, so that sound emitted therefrom is directed axially onto the surfaces of the room to naturally equalize the output of the speaker system.
    Type: Grant
    Filed: November 25, 2002
    Date of Patent: February 22, 2005
    Inventor: Kenneth A. Fingleton
  • Publication number: 20040240698
    Abstract: Micro-speaker assemblies and mobile terminals including micro-speaker assemblies are provided. The micro-speaker assembly includes a micro-speaker positioned in a housing. A low frequency back tuning volume is adjacent a front face of the micro-speaker and a high frequency forward tuning volume is adjacent a back face of the micro-speaker. A passageway extends from the forward tuning volume to an opening in the housing.
    Type: Application
    Filed: May 30, 2003
    Publication date: December 2, 2004
    Inventor: William Chris Eaton
  • Publication number: 20040170292
    Abstract: The invention concerns a mobile membrane loudspeaker equipped with a partial closure optimising its radiation. The invention is characterised in that the loudspeaker with mobile diaphragm (19) attached to a rigid frame (15) defining an acoustic emission plane (P) comprises a closure (25) for only one central zone of said emission plane.
    Type: Application
    Filed: January 22, 2004
    Publication date: September 2, 2004
    Inventor: Eric Vincenot
  • Publication number: 20040131217
    Abstract: A system is disclosed for changing a coverage angle of sound produced from a loudspeaker system. The loudspeaker system includes an enclosure that projects sound at a predetermined angle. A sound integrator includes an inner surface positioned adjacent to a mid-range frequency sound source. An outer surface of the sound integrator includes a planar and a curved surface. The surfaces control the angle which sound radiates from the loudspeaker.
    Type: Application
    Filed: July 1, 2003
    Publication date: July 8, 2004
    Inventors: Scott M. Opie, Mark E. Engebretson, Yoshiyuki Takeuchi
  • Patent number: 6744902
    Abstract: An enclosure for one or more loudspeakers includes a housing having a top panel, a bottom panel, a front panel, a back panel and opposed end panels collectively defining a hollow interior which is open at an aperture formed in one of the panels. A baffle is mounted within the housing interior which supports one or more loudspeakers and forms a port to direct sound radiating from the back of the speakers to the aperture. All of the panels, and at least the portion of the baffle which is visible through the aperture, are covered with carpeting to provide a finished appearance for mounting of the enclosure within the interior of a vehicle.
    Type: Grant
    Filed: July 10, 2002
    Date of Patent: June 1, 2004
    Assignee: JL Audio, Inc.
    Inventor: Lucio Proni
  • Publication number: 20040076304
    Abstract: The frequency at which standing waves occur in a loudspeaker enclosure may be reduced by the addition of an internal barrier to the enclosure in order to lengthen the effective length of an internal dimension of the enclosure. Additionally, the internal barrier may be configured such that it forms a resistive coupling between two sides of the barrier. By configuring the internal barrier to form a resistive coupling, aberrations in the frequency response of the loudspeaker caused by certain standing waves may be dampened.
    Type: Application
    Filed: October 17, 2002
    Publication date: April 22, 2004
    Inventors: Eric J. Freeman, T. Holl
  • Patent number: 6704425
    Abstract: A bass reflex loudspeaker system capable of optimized sub-bass (<100 Hz) response. The loudspeaker system incorporates a closed cabinet, an electromechanical driver, a virtual acoustic radial transmission line (VARTL), a reactive alternate density transmission medium (ADTM) load and a radial right angle wave guide (RRAWG). The VARTL is disposed around and in front of the cone of the driver so as to allow the driver to maintain loading to very low frequencies, while simultaneously isolating the driver from reflected signals, acoustic summation or stimulus. The ADTM slows the speed of the wave, thereby causing delay and intentional attenuation of the initial waveform while, by way of radial expansion, allows the proper exit velocity. The RRAWG acts as a guide and is disposed within the VARTL to introduce the signal into the throat of the VARTL, thereby allowing the cone to drive the port air mass and the VARTL air mass with essentially equal pressure on each cycle throughout the frequency range of the VARTL.
    Type: Grant
    Filed: November 19, 1999
    Date of Patent: March 9, 2004
    Assignee: Virtual Bass Technologies, LLC
    Inventor: Jan P. Plummer
  • Patent number: 6704426
    Abstract: A bandpass loudspeaker enclosure system including at least one electro-acoustic transducer with a vibratable diaphragm having a first acoustical coupling surface and a second acoustical coupling surface, and at least one differential area passive radiator with three separate acoustical coupling surface areas. The first acoustical coupling surface of the vibratable diaphragm is substantially air coupled through a first enclosure volume to a first of the three separate acoustical coupling surface areas of the at least one differential area passive radiator. A second of the three separate acoustical coupling surface areas of the at least one differential area passive radiator is substantially air coupled through a second chamber to the external environment through a restricted acoustic opening or passive acoustic radiator of predetermined characteristics.
    Type: Grant
    Filed: January 2, 2001
    Date of Patent: March 9, 2004
    Assignee: American Technology Corporation
    Inventor: James J. Croft, III
  • Patent number: 6665413
    Abstract: An infrasonic Helmholtz resonator capable of producing clean sinusoidal frequencies in the range of 6-14 Hz is described.
    Type: Grant
    Filed: July 22, 2002
    Date of Patent: December 16, 2003
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: John K. Domen
  • Patent number: 6625292
    Abstract: An enclosure for one or more loudspeakers includes a housing having a top panel, a bottom panel, a front panel, a back panel and opposed end panels collectively defining a hollow interior which is open at an aperture formed in one of the panels. A baffle is mounted within the housing interior which supports one or more loudspeakers and forms a port to direct sound radiating from the back of the speakers to the aperture. All of the panels, and at least the portion of the baffle which is visible through the aperture, are covered with carpeting to provide a finished appearance for mounting of the enclosure within the interior of a vehicle.
    Type: Grant
    Filed: November 15, 2001
    Date of Patent: September 23, 2003
    Assignee: JL Audio, Inc.
    Inventor: Lucio Proni
  • Publication number: 20030174851
    Abstract: A hybrid bass reflex loudspeaker system capable of optimized sub-bass (<250 Hz) response. The basic low frequency loudspeaker system incorporates a ported cabinet, an electromechanical driver, a virtual acoustic radial transmission line (VARTL) and a radial right angle wave-guide (RRAWG). The aperiodic VARTL is disposed around and in front of the cone of the driver so as to allow the driver to maintain loading to very low frequencies, while simultaneously isolating the driver from reflected signals acoustic summation or stimulus. The VARTL slows the speed of the wave, thereby causing delay and intentional loading of the driver cone while, by the way of radial expansion, allows adequate exit velocity VARTL enhanced loading increases the effective isolation of driver and port to enhance the depth of the cone null at resonance to approach infinity.
    Type: Application
    Filed: June 2, 2003
    Publication date: September 18, 2003
    Inventor: Jan Princeton Plummer
  • Patent number: 6493455
    Abstract: The invention relates to a loudspeaker assembly including a housing having a central driver mounting plate upon which a driver is mounted. The central driver mounting plate and the driver divide the housing into an upper compartment and a lower compartment, wherein the lower compartment includes at least one slot providing fluid communication between an interior of the lower compartment and an external environment.
    Type: Grant
    Filed: June 2, 2000
    Date of Patent: December 10, 2002
    Inventor: Dennis A. Tracy
  • Publication number: 20020114484
    Abstract: A loudspeaker system design is disclosed. The system includes a driver with a motor structure that is supported by an integrated basket-enclosure. This loudspeaker system reduces the overall size of the enclosure, and increases the efficiency of the design.
    Type: Application
    Filed: January 4, 2001
    Publication date: August 22, 2002
    Inventors: John D. Crisco, David A. Fitzpatrick, Timothy E. Meeks
  • Publication number: 20020097888
    Abstract: A subwoofer assembly for use within an aircraft including a fuselage having a passenger platform, wherein the passenger platform includes an aisle and a seating area. The subwoofer assembly is shaped and dimensioned for positioning under the aisle. The subwoofer assembly includes a subwoofer housing having a profile shaped to substantially conform to a position beneath the passenger platform under the aisle. The subwoofer housing includes a sound port through which sound is delivered from the subwoofer assembly to a passenger compartment of the aircraft. The subwoofer assembly further including a sound driver mounted within the subwoofer housing for generating predetermined sounds.
    Type: Application
    Filed: January 25, 2001
    Publication date: July 25, 2002
    Inventor: Dennis A. Tracy
  • Patent number: 6389146
    Abstract: In a preferred embodiment, a bandpass loudspeaker enclosure includes three sub chambers, a first one being a non-Helmholtz-reflex chamber of a sealed acoustic suspension construction, and the remaining two chambers utilizing two passive acoustic radiators to achieve two Helmholtz-reflex vent tunings and a multiple of low pass acoustic filters that provide an acoustic bandpass with a substantially 2nd order high pass characteristic combined with an extended, steeper, at least 4th order slope low pass stop band characteristic.
    Type: Grant
    Filed: February 17, 2000
    Date of Patent: May 14, 2002
    Assignee: American Technology Corporation
    Inventor: James J. Croft, III
  • Publication number: 20020006210
    Abstract: Disclosed is an improved loudspeaker comprising a pre-stressed cabinet and a loudspeaker unit fixed to the inside of the cabinet. The cabinet comprises a hollow conical assembly including two conical bodies of high-rigidity metal, one press-fitted into the other by applying an increased compressive force. The hollow conical assembly has front and rear plates closing its front and rear openings. These front and rear plates are pulled toward each other by tightening screw rods.
    Type: Application
    Filed: April 17, 2001
    Publication date: January 17, 2002
    Inventor: Teppei Yamada
  • Patent number: 6078676
    Abstract: A compact speaker system is capable of reproducing a heavy bass sound with a superior transition characteristic. A sound radiated from a speaker unit passes through a three-dimensional spiral sound passage formed by a coaxial dual-tube structure provided in front of the speaker unit. In the coaxial dual-tube structure, a spiral partition plate is provided to bridge a gap between an outer tube and an inner tube so as to form the spiral sound passage.
    Type: Grant
    Filed: February 8, 1999
    Date of Patent: June 20, 2000
    Inventor: Masaaki Takenaka
  • Patent number: 6021208
    Abstract: The invention herein relates to a kind of hidden speaker enclosure structure that is comprised of a sound chamber, a chamber cover, a speaker and a sound tube, of which the speaker is positioned inside the sound chamber and the chamber cover is sealed onto the opening of the sound chamber to enable the speaker to be concealed within the sound chamber. Furthermore, there are more than one insertion holes through the surface of chamber cover for the insertion of sound tubes that serve as the only media interface between the sealed sound chamber and the air outside. Since the speaker is positioned inside a small sealed space, driven under maximum efficiency conditions, the speaker can be matched with sound tubes of different widths and lengths to convey and produce high transmitted frequencies and, furthermore, call filter the original physical audio spectrum of the speaker.
    Type: Grant
    Filed: September 29, 1997
    Date of Patent: February 1, 2000
    Inventor: Lien Kin-Lung
  • Patent number: 5930376
    Abstract: A laptop computer is disclosed that includes an improved audio speaker system. The laptop computer typically is designed to have a first shell and a second shell that are attached together. Typically located within the first shell are a central processing unit, a keyboard, and other circuits such as a battery, a hard disk storage, and other connectors such as a PCMCIA slot. A video monitor is typically located in the second shell of the laptop computer and is coupled to the central processing unit via a system bust, or a video driver is provided that may be subsequently coupled to the CPU, such that the video driver drives the video monitor. Then, an audio speaker system is provided that in one embodiment is mounted in a back portion of the second shell that is located opposite the video monitor. This audio speaker system includes a transmission line comprising a first piezo speaker and a second piezo speaker.
    Type: Grant
    Filed: March 4, 1997
    Date of Patent: July 27, 1999
    Assignee: Compaq Computer Corporation
    Inventors: Mitchell A. Markow, Steven S. Homer