Having Crossover Filter Patents (Class 381/99)
  • Patent number: 10547943
    Abstract: A system and method include filtering with controllable transfer functions in signal paths upstream of K?1 output paths and downstream of Q?1 source input paths, and controlling with filter control signals of the controllable transfer functions according to an adaptive control algorithm based on error signals on M?1 error input paths and source input signals on the Q source input paths. The system and method further include at least one psychoacoustic constraint.
    Type: Grant
    Filed: April 2, 2015
    Date of Patent: January 28, 2020
    Assignee: HARMAN BECKER AUTOMOTIVE SYSTEMS GMBH
    Inventor: Markus Christoph
  • Patent number: 10499153
    Abstract: Embodiments relate to an audio processing system that adjusts for unmatched speakers, such as by frequency response, output power, directionality, etc. For example, a mobile device may include an earpiece speaker and a micro-loudspeaker. The audio processing system may include a crossover network that separates an input audio signal into a low frequency signal and a high frequency signal. Subband spatial processing and b-chain processing are applied to the high frequency signal to spatially enhance the input signal, and adjust the input signal for the unmatched speakers. The low frequency signal is processed using a parametric band-pass filter and a first gain to generate a low frequency resonator signal, and a second gain to generate a low frequency passthrough signal. The processed low frequency signals are provided to the micro-loudspeaker by combination with one of a left channel or a right channel of the processed high frequency signal.
    Type: Grant
    Filed: September 28, 2018
    Date of Patent: December 3, 2019
    Assignee: Boomcloud 360, Inc.
    Inventor: Zachary Seldess
  • Patent number: 10477316
    Abstract: An amplifier circuit is disclosed suitable for feeding a loudspeaker system having plural drivers. The amplifier circuit has an output stage and plural output connectors such that there is an output connector for each driver, wherein the output stage is connected separately to each output connector for independent connection to each driver. A method of feeding a loudspeaker system having plural drivers with an amplifier circuit having an output stage is also disclosed.
    Type: Grant
    Filed: October 16, 2015
    Date of Patent: November 12, 2019
    Assignee: Blueprint Acoustics Pty Ltd
    Inventors: Zeljko Velican, Walter Melville Dower
  • Patent number: 10460716
    Abstract: A system and method include filtering with controllable transfer functions in signal paths upstream of K?1 output paths and downstream of Q?1 source input paths, and controlling with filter control signals of the controllable transfer functions according to an adaptive control algorithm based on error signals on M?1 error input paths and source input signals on the Q source input paths. The system and method further include at least one loudspeaker-room-microphone constraint.
    Type: Grant
    Filed: April 2, 2015
    Date of Patent: October 29, 2019
    Assignee: HARMAN BECKER AUTOMOTIVE SYSTEMS GMBH
    Inventor: Markus Christoph
  • Patent number: 10299052
    Abstract: Disclosed in the present specification are a multimedia apparatus for servicing an optimized sound depending on the surrounding environment and a method for processing an audio signal thereof. The method for processing an audio signal of the multimedia apparatus, according to the present invention, comprises the steps of: receiving an external test sound; analyzing the frequency properties of the received test sound; calculating a compensation value of the test sound according to the analyzed frequency properties; compensating an audio signal to be output, according to the calculated compensation value; and outputting the compensated audio signal.
    Type: Grant
    Filed: May 11, 2018
    Date of Patent: May 21, 2019
    Assignee: LG ELECTRONICS INC.
    Inventors: Sungtae Lee, Jinhong Shin
  • Patent number: 10284954
    Abstract: A loudspeaker system is described that includes a loudspeaker and an extender. The loudspeaker can be positioned on the ground and the extender can be optionally connected thereto. When the extender is connected to the loudspeaker, the loudspeaker is capable of selectively sending high-frequency components of an input audio signal to the extender and the extender is capable of playing back such high-frequency components to produce high-frequency audio. Due to the fact that an audio-producing apparatus of the extender can be positioned at a higher elevation than the loudspeaker, the high-frequency audio (which is more directional than lower-frequency audio) can be produced at a height that is likely to match that of the ear height of a user as opposed to producing the audio at floor height.
    Type: Grant
    Filed: January 4, 2017
    Date of Patent: May 7, 2019
    Assignee: Caavo Inc
    Inventors: Andrew E. Einaudi, Ashish D. Aggarwal
  • Patent number: 10251015
    Abstract: Disclosed is a method for determining filter coefficients of an audio precompensation controller for the compensation of an associated sound system, including N?2 loudspeakers, including estimating, for each one of at least a pair of the loudspeakers, a model transfer function at each of M control points distributed in Z?2 spatially separated listening zones in a listening environment of the sound system. The method also includes determining, for each of the M control points, a zone-dependent target transfer function at least based on the zone affiliation of the control point; and determining the filter coefficients of the audio precompensation controller at least based on the model transfer functions and the target transfer functions of the M control points. Consequently, an audio precompensation controller for an associated sound system can be obtained that enables improved and/or customized sound reproduction in two or more listening zones simultaneously.
    Type: Grant
    Filed: August 21, 2014
    Date of Patent: April 2, 2019
    Assignee: DIRAC RESEARCH AB
    Inventors: Adrian Bahne, Anders Ahlen
  • Patent number: 10165385
    Abstract: A system for generating calibrated multi-channel non-coherent signals. The system comprises a plurality of synthesizers for generating a corresponding plurality of signals, and a plurality of filters for band-pass filtering the plurality of generated signals. Each filter filters the signal generated by one of the plurality of synthesizers, by performing the band-pass filtering in a dedicated frequency band. The system comprises a plurality of loudspeakers for playing the plurality of filtered signals respectively filtered by the plurality of filters. The system comprises a channel configurator for configuring at least one of the filters for performing the band-pass filtering according to a calibrated amplitude spectrum of the signal.
    Type: Grant
    Filed: February 24, 2017
    Date of Patent: December 25, 2018
    Assignee: CAE INC.
    Inventor: Maxime Ayotte
  • Patent number: 9900690
    Abstract: A nonlinear control system and a loudspeaker protection system. In particular, a nonlinear control system including a controller, an audio system, and a model is disclosed. The controller is configured to accept one or more input signals, and one or more estimated states produced by the model to produce one or more control signals. The audio system includes one or more transducers configured to accept the control signals to produce a rendered audio stream therefrom. An active loudspeaker with an integrated amplifier is disclosed. A loudspeaker protection system and a quality control system are disclosed. More particularly, a system for clamping the input to a loudspeaker dependent upon a bank of representative models is disclosed.
    Type: Grant
    Filed: September 24, 2013
    Date of Patent: February 20, 2018
    Assignee: CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LTD.
    Inventors: Pär Gunnars Risberg, Erik Lindahl, Marcus Arvidsson, Daniel Stahre, Landy Toth
  • Patent number: 9875756
    Abstract: A system for processing audio data comprising a first signal processing path configured to generate a mask control signal. A second signal processing path configured to generate a decorrelated input audio signal. A mixer configured to mix the mask control signal and the decorrelated input audio signal and to generate an output.
    Type: Grant
    Filed: September 23, 2015
    Date of Patent: January 23, 2018
    Assignee: PSYX RESEARCH, INC.
    Inventor: Robert W. Reams
  • Patent number: 9860662
    Abstract: A computing device may transmit playback device configuration information to a given playback device. The computing device may then receive calibration data corresponding to each playback device of a plurality of playback devices, and receive playback device characteristic data indicating at least one playback device characteristic for each playback device of the plurality of playback devices. Based on at least the received calibration data and the received playback device characteristic data, the computing device may determine updated playback device configuration information and transmit data indicating the updated playback device configuration information to the given playback device.
    Type: Grant
    Filed: April 1, 2016
    Date of Patent: January 2, 2018
    Assignee: Sonos, Inc.
    Inventors: Simon Jarvis, Klaus Hartung, Chris Davies, Tim Sheen
  • Patent number: 9860664
    Abstract: A system for dynamically adapting calibrated multi-channel non-coherent signals. The system comprises a physical simulation environment, a plurality of synthesizers for generating a corresponding plurality of signals, a plurality of filters for band-pass filtering the plurality of generated signals, and a plurality of loudspeakers positioned on a wall of the physical simulation environment for playing the plurality of filtered signals inside the physical simulation environment. The system comprises a noise sensor positioned inside the physical simulation environment for measuring a physical simulation environment signal amplitude and transmitting the physical simulation environment signal amplitude to a channel configurator. The system comprises the channel configurator for configuring each synthesizer to generate the corresponding signal according to a calibrated amplitude spectrum of the signal.
    Type: Grant
    Filed: February 24, 2017
    Date of Patent: January 2, 2018
    Assignee: CAE INC.
    Inventor: Maxime Ayotte
  • Patent number: 9836328
    Abstract: An apparatus includes at least one processor executing a method for managing memory among a plurality of concurrently-running virtual machines, and a non-transitory memory device that stores a set of computer readable instructions for implementing and executing said memory management method. A memory optimization mechanism can reduce a memory usage of a virtual machine at a cost of increasing a central processing unit (CPU) usage. Information on a memory usage and a CPU usage of each virtual machine is periodically collected. When a first virtual machine exhibits high memory use, at least one second virtual machine with an extra CPU capacity is identified. A memory optimization mechanism is applied to the second virtual machine to reduce memory used by the second virtual machine, thereby providing a portion of freed memory that is then allocated to the first virtual machine.
    Type: Grant
    Filed: December 31, 2015
    Date of Patent: December 5, 2017
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Norman Bobroff, Michael Hilton Dawson, Liana Liyow Fong, Arun Kwangil Iyengar, Peter Hans Westerink
  • Patent number: 9753537
    Abstract: An information processing apparatus for outputting a predetermined sound selectively from a plurality of sound output apparatuses and vibrating a predetermined vibration apparatus selects from the plurality of sound output apparatuses a sound output apparatus to output the sound, performs vibration control for vibrating the vibration apparatus, and performs different types of vibration control in accordance with the selected sound output apparatus.
    Type: Grant
    Filed: April 2, 2015
    Date of Patent: September 5, 2017
    Assignee: NINTENDO CO., LTD.
    Inventors: Kazutoshi Obana, Kochi Kawai, Junichiro Miyatake, Keisuke Seko, Shoji Masubuchi, Takafumi Aoki, Kei Yamashita, Masahiko Inami, Kouta Minamizawa
  • Patent number: 9736614
    Abstract: The technology described in this document can be embodied in a method that includes receiving, at a processing device, a feedback signal from a recording device, and generating, based on the feedback signal, a control signal for adjusting an acoustic output of a speaker device to achieve a target acoustic distribution within the environment. The feedback signal can indicate an acoustic characteristic of an environment in which a speaker device is located. The method also includes providing the control signal to the speaker device.
    Type: Grant
    Filed: March 23, 2015
    Date of Patent: August 15, 2017
    Assignee: Bose Corporation
    Inventors: Igor Kofman, David Rolland Crist, Christopher James Mulhearn, Matthew Belge, Michael Tiene, Avrum G. Mayman
  • Patent number: 9736581
    Abstract: A nonlinear control system and a loudspeaker protection system. In particular, a nonlinear control system including a controller, an audio system, and a model is disclosed. The controller is configured to accept one or more input signals, and one or more estimated states produced by the model to produce one or more control signals. The audio system includes one or more transducers configured to accept the control signals to produce a rendered audio stream therefrom. An active loudspeaker with an integrated amplifier is disclosed. A loudspeaker protection system and a quality control system are disclosed. More particularly, a system for clamping the input to a loudspeaker dependent upon a bank of representative models is disclosed.
    Type: Grant
    Filed: September 24, 2013
    Date of Patent: August 15, 2017
    Assignee: CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LTD.
    Inventors: Pär Gunnars Risberg, Erik Lindahl, Marcus Arvidsson, Daniel Karlsson, Landy Toth
  • Patent number: 9491551
    Abstract: An electrical network for driving electromagnetic bone conduction vibrator/transducer of variable reluctance type which is applied between the vibrator terminals and the power amplifier terminals so that the vibrator mechanical output is maximized in the mid and high frequencies.
    Type: Grant
    Filed: November 11, 2011
    Date of Patent: November 8, 2016
    Assignee: Osseofon AB
    Inventor: Bo Håkansson
  • Patent number: 9349280
    Abstract: Concepts and technologies are disclosed herein for disrupting bone conduction signals. According to one aspect, a device can receive a signal via a communication path that is external to a body of a user associated with the device. The device can generate a disruption signal to disrupt the signal. The device can send the disruption signal through the body of the user to disrupt the signal.
    Type: Grant
    Filed: November 18, 2013
    Date of Patent: May 24, 2016
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Christopher Baldwin, Brian S. Amento
  • Patent number: 9349282
    Abstract: Mobile device speaker control may include: monitoring one or more devices wirelessly coupled with a data network, receiving one or more data packets from each of the one or more devices, filtering received data packets by evaluating a received signal strength (e.g., RSSI) of the received packets, comparing the received signal strength of each of the received packets to a threshold to determine whether the one or more devices are to perform an action, and performing the action only if one or more indicia other than the received signal strength indicate a near field proximity within the threshold or a direct physical contact between a wireless device receiving the data packets and one of the one or more devices that is wirelessly transmitting the data packets.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: May 24, 2016
    Assignee: AliphCom
    Inventors: Michael Edward Smith Luna, Hawk Yin Pang
  • Patent number: 9338387
    Abstract: Integrated processing of audio/video signals can eliminate unnecessary signal processors and converters without losing the functionality of typical home entertainment system components. The integrated system includes a main player that captures and processes signals digitally, a dummy display, and a dummy speaker. The dummy display may only have a display panel and a panel driver. The dummy speaker may only have a driving unit and no crossover logic. The main player may have a PC architecture and process all signals digitally for outputting signals tailored for the display device and the individual driving units of the dummy speaker. The integrated system may also provide dynamic signal adjustments based on the surrounding environment. The main player may include a storage device and can process media content stored therein to produce supplemental information to provide an optimal audiovisual experience. This supplemental information can be shared among users over a network connection.
    Type: Grant
    Filed: June 11, 2012
    Date of Patent: May 10, 2016
    Inventor: Chul Chung
  • Patent number: 9311813
    Abstract: Concepts and technologies are disclosed herein for disrupting bone conduction signals. According to one aspect, a device can receive a signal via a communication path that is external to a body of a user associated with the device. The device can generate a disruption signal to disrupt the signal. The device can send the disruption signal through the body of the user to disrupt the signal.
    Type: Grant
    Filed: November 18, 2013
    Date of Patent: April 12, 2016
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Christopher Baldwin, Brian S. Amento
  • Patent number: 9280892
    Abstract: Concepts and technologies are disclosed herein for disrupting bone conduction signals. According to one aspect, a device can receive a signal via a communication path that is external to a body of a user associated with the device. The device can generate a disruption signal to disrupt the signal. The device can send the disruption signal through the body of the user to disrupt the signal.
    Type: Grant
    Filed: November 18, 2013
    Date of Patent: March 8, 2016
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Christopher Baldwin, Brian S. Amento
  • Patent number: 9253562
    Abstract: An audio module for use in a vehicle cabin. An elongated substantially sealed enclosure has two ends in the lengthwise direction. A first acoustic driver is mounted in the enclosure near one end of the enclosure for radiating acoustic energy from the end of the enclosure. A second acoustic driver is mounted in the enclosure near a second end of the enclosure for radiating acoustic energy from the second end of the enclosure. The audio module includes a bass augmenting device for radiating low frequency acoustic energy from the enclosure. The audio module is constructed and arranged to be pre-assembled so that the audio module can be installed in the vehicle as a single assembly. The audio module is configured to be mounted to the vehicle so that the lengthwise direction is substantially vertical with the first end of the enclosure higher than the second end of the enclosure.
    Type: Grant
    Filed: April 2, 2012
    Date of Patent: February 2, 2016
    Assignee: Bose Corporation
    Inventor: Christopher Ludwig
  • Patent number: 9247340
    Abstract: An impedance matched resonant circuit uses inductors coupling an audio source and a speaker array in order to reduce feedback reflection induced by an audio signal traveling from the audio source to the array of speakers. An RC circuit could also be coupled to the positive and negative terminals of the speaker array to reduce the slope differential of the audio signal at certain frequencies. The circuit can be packaged together in a single module with switches to activate and deactivate portions of the circuit to alter the effectiveness of the circuit depending upon need.
    Type: Grant
    Filed: October 1, 2014
    Date of Patent: January 26, 2016
    Assignee: REVx Technologies, Inc.
    Inventors: Wayne J. Powell, Dennis Rauschmayer
  • Patent number: 9226073
    Abstract: Systems and method are provided herein for balancing of outputs from playback devices playing audio content in synchrony. In one embodiment, the balancing of outputs may involve receiving a first audio signal to be played by a first playback device according to a first crossover frequency, determining a limiting result by applying a limiting function associated with a second playback device to a second audio signal to be played by the second playback device according to a second crossover frequency, and based on the first limiting result, configuring the first playback device to play the first audio signal according to a third crossover frequency. In some cases, the first and second playback devices may be configured to play the first and second audio signals, respectively, in synchrony.
    Type: Grant
    Filed: February 6, 2014
    Date of Patent: December 29, 2015
    Assignee: Sonos, Inc.
    Inventors: Aurelio Rafael Ramos, Timothy W. Sheen
  • Patent number: 9226058
    Abstract: A speaker assembly is provided with a speaker, a housing mounted to the speaker, and a reflector spaced apart from and facing the speaker. The reflector has a generally convex central region and a plurality of circumferentially spaced lobes, each extending radially outward from the central region for reflecting acoustic vibrations from the speaker radially outboard from the reflector while providing gaps between the lobes for permitting acoustic vibrations to pass therethrough. A series of supports connect the housing and the reflector. The supports are spaced circumferentially about the housing for providing openings between the supports for an outlet of the reflected acoustic vibrations. Each of the supports is aligned with and externally visually conceals one of the lobes.
    Type: Grant
    Filed: December 6, 2012
    Date of Patent: December 29, 2015
    Inventor: Ronald Paul Harwood
  • Patent number: 9191766
    Abstract: The listening room comprises at least one loudspeaker and at least one listening position. The method comprises providing for each loudspeaker, a group delay response to be equalized associated with one pre-defined position within the listening room; calculating filter coefficients for all-pass filter(s) each arranged upstream to one corresponding loudspeaker, the all-pass filter(s) having a transfer characteristic such that the corresponding group delay response(s) match(es) a predefined target group delay response. The filter coefficients have a group delay response being confined by a frequency dependent group delay constraint that defines a frequency dependent interval exponentially decaying with increasing frequency.
    Type: Grant
    Filed: December 21, 2010
    Date of Patent: November 17, 2015
    Assignee: Harman Becker Automotive Systems GmbH
    Inventors: Markus Christoph, Leander Scholz
  • Patent number: 9191232
    Abstract: This disclosure describes an intelligent network communication device in an audio video distribution system that uses a local area network that includes a network speaker node; an audio input device that receives the analog audio signal and that couples to a network speaker node through a speaker/microphone driver; and an audio output device that transmits the analog audio signal and that couples to the network speaker node through the speaker/microphone driver. The network speaker node further includes a controller with a network interface that couples to the local area network, where the controller further comprises an embedded controller with memory and which is programmed to function as a web server. The network speaker node further includes a digital signal processor that couples to the controller. And, the network speaker node further includes a speaker/microphone driver that couples to the digital signal processor.
    Type: Grant
    Filed: October 8, 2010
    Date of Patent: November 17, 2015
    Assignee: NETSTREAMS, LLC
    Inventors: Michael Braithwaite, Herman Cardenas
  • Patent number: 9161128
    Abstract: An audio system may include a canalphone housing, and a plurality of low frequency drivers carried by the canalphone housing. The system may also include a plurality of high frequency drivers carried by the canalphone housing, the plurality of high frequency drivers tuned to produce an audio trace in the 10 kilohertz to 22 kilohertz on an audio analyzer.
    Type: Grant
    Filed: October 8, 2014
    Date of Patent: October 13, 2015
    Inventor: Jerry Harvey
  • Patent number: 9113257
    Abstract: Complimentary crossovers that reduce phase distortion in loudspeaker systems, typically pairs, are described. In the fundamental embodiment, each loudspeaker possesses two drivers, a woofer and a tweeter. The “effective third-order” crossover on the right-hand loudspeaker remains “symmetric,” but the “effective third-order” crossover on the left-hand loudspeaker is rendered “asymmetric,” as described. Other embodiments apply this principle to other crossover orders and/or greater numbers of drivers. This technology can be combined with other circuits like a Zobel, typically used for impedance correction. Some configurations of “phase-unified” loudspeakers require that a Zobel is applied to all drivers except the tweeter. Accordingly a rule combining effective crossover order and handedness is established.
    Type: Grant
    Filed: February 1, 2013
    Date of Patent: August 18, 2015
    Inventor: William E. Collins
  • Patent number: 9066171
    Abstract: An apparatus comprises at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: determine at least one parameter of a transducer on the basis of received information; and modify a received signal for actuating the transducer on the basis of the determined parameters of the transducer and a frequency spectrum of the received signal. The apparatus protects the transducer from damage due to excessive displacement caused by the received signal.
    Type: Grant
    Filed: December 24, 2009
    Date of Patent: June 23, 2015
    Assignee: Nokia Corporation
    Inventors: Jukka Vesa Tapani V. Rauhala, Jouni Paaaho
  • Patent number: 9036841
    Abstract: A speaker system includes a first speaker (203) and a second speaker (205). A driving circuit receives an audio signal and has a first drive circuit (209) generating a first drive signal for the first speaker (203) in response to a first filtering of the audio signal with a first passband. A second drive circuit (211) generates a second drive signal for the second speaker (205) in response to a second filtering having a second passband which includes a frequency band below the first passband. A delay (213) delays the second drive signal relative to the first drive signal. The sound from the second speaker is directionally radiated with a directional radiation pattern having a notch towards the listening position (111). The system uses the precedence effect and non-direct low frequency audio radiation to ensure that directional cues are predominantly provided by the first speaker (203) which may be small and positioned remote from the second speaker (205).
    Type: Grant
    Filed: March 3, 2011
    Date of Patent: May 19, 2015
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Werner Paulus Josephus De Bruijn, William John Lamb
  • Patent number: 9031260
    Abstract: A band division apparatus obtains an analog low-band signal, an analog intermediate-band signal and an analog high-band signal from a digital sound signal. In the band division apparatus, a digital filter separates the digital sound signal into a digital intermediate-band signal having the intermediate frequency band while the high frequency band and the low frequency band are attenuated, and a digital low-high-band signal having a frequency band combining the low frequency band and the high frequency band while the intermediate frequency band are attenuated. A DA converter converts the digital low-high-band signal into an analog low-high-band signal. Another DA converter converts the digital intermediate-band signal into the analog intermediate-band signal. An analog filter separates the analog low-high-band signal into the analog low-band signal and the analog high-band signal.
    Type: Grant
    Filed: December 23, 2009
    Date of Patent: May 12, 2015
    Assignee: Yamaha Corporation
    Inventor: Takahiro Okumura
  • Patent number: 9008330
    Abstract: Methods and systems are provided for adjusting a crossover frequency between a plurality of audio speakers rendering audio content. In one example, a first subset of a plurality of audio speakers may be rendering a first sub-range of a range of audio frequencies of an audio content, and a second subset of speakers of the plurality of audio speakers may be rendering a second sub-range of the range of audio frequencies. In this example, the first sub-range and the second sub-range may be substantially separated at the crossover frequency. In one case, a playback volume at which the audio content is being rendered may be adjusted. In one instance, the crossover frequency may be adjusted in response to the volume adjustment to improve the audio content rendering quality by the respective subsets of audio speakers in the plurality of audio speakers.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: April 14, 2015
    Assignee: Sonos, Inc.
    Inventors: Timothy W. Sheen, Michael Darrell Andrew Ericson, William H. Bush
  • Patent number: 8989404
    Abstract: A drive system comprises a splitter (107) which generates a low frequency signal and high frequency signal from an input signal. A first drive circuit (111, 115) is coupled to the splitter (107) and generates a drive signal for an audio driver (105) from the low frequency signal. A second drive circuit (117, 119) is coupled to the splitter (117) and generates a drive signal for a second audio driver (101) from the high frequency signal. The second drive circuit (117, 119) provides a bass frequency extension for the second audio driver (101) by applying low frequency boost to the low frequency signal. A processor (125) determines a driver excursion indication for the second audio driver (101) and a controller (127) performs a combined adjustment of a cross-over frequency for the high and low frequency signals and a characteristic of the low frequency boost based on the driver excursion indication. The invention may provide improved interworking between e.g. a subwoofer and satellite speakers.
    Type: Grant
    Filed: April 8, 2010
    Date of Patent: March 24, 2015
    Assignee: Woox Innovations Belgium NV
    Inventor: Gerrit De Poortere
  • Patent number: 8976974
    Abstract: The invention relates to a method for automated tuning of a sound system, the sound system comprising delay lines, equalizing filters, and at least two loudspeakers, the method comprising the steps of reproducing a useful sound signal through the loudspeakers, measuring sound pressure values at least one location, providing a target transfer function for tuning the delay lines and the equalizing filters of the sound system, the target transfer function representing a desired transfer characteristics of the sound system, adjusting the delay of the delay lines, and adjusting amplitude responses of the equalizing filters such, that the actual transfer characteristics of the sound system approximates the target function.
    Type: Grant
    Filed: March 23, 2012
    Date of Patent: March 10, 2015
    Assignee: Harman Becker Automotive Systems GmbH
    Inventors: Markus Christoph, Leander Scholz
  • Publication number: 20150023525
    Abstract: A canalphone system may include a canalphone housing, and a first high frequency driver carried within the canalphone housing. The system may also include a second high frequency driver carried within the canalphone housing where the second high frequency driver is tuned with the first high frequency driver to deliver lower distortion than a standard canalphone high frequency driver and/or lower distortion than two standard canalphone high frequency drivers that are not tuned with each other.
    Type: Application
    Filed: October 9, 2014
    Publication date: January 22, 2015
    Inventor: Jerry Harvey
  • Patent number: 8934643
    Abstract: An apparatus for generating a drive signal for a sound transducer (109) comprises a sound generator (101) which provides an input audio signal. A divider (101) divides the input audio signal into at least a low frequency signal and a high frequency signal and an expander (105) generates an expanded signal by applying a dynamic range expansion to the low frequency signal. A combiner (107) then generates the drive signal by combining the expanded signal and the higher frequency signal. The threshold for applying the dynamic range extension may be adjusted depending on the amplitude of the low frequency signal. The low frequency signal may furthermore be compressed into a narrow frequency band around a resonance frequency. The approach may allow improved audio quality especially from high Q low frequency sound transducers by attenuating decay parts of bass signals thereby reducing sustain or ringing for bass notes.
    Type: Grant
    Filed: April 3, 2009
    Date of Patent: January 13, 2015
    Assignee: Koninklijke Philips N.V.
    Inventors: Ronaldus Maria Aarts, Thomas Pieter Jan Peeters
  • Patent number: 8934644
    Abstract: A channel divider that can suitably set a crossover frequency when a biwiring-connectable multiway speaker system including network circuits are used is provided. The channel divider includes a low-pass filter LPF and a high-pass filter HPF for dividing a band of a sound signal into a first output signal and a second output signal so as to output the signals, and a control circuit for controlling the filters. The channel divider has a sound output mode in which the control circuit sets a cutoff frequency fcL of LPF to a value higher than fc0 by about ? to 1 Oct., sets a cutoff frequency fcH of HPF to a value lower than fc0 by about ? to 1 Oct., and outputs the first output signal and the second output signal including frequency bands fcL to fcH when any crossover frequency fc0 for defining the band division is specified.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: January 13, 2015
    Assignee: Onkyo Corporation
    Inventor: Kazumasa Takemura
  • Publication number: 20150003633
    Abstract: A process and system for enhancing and customizing sound comprises receiving an input audio sound and processing the input by one or more filter blocks to dynamically reshape the dynamic, phase and frequency content of the input audio sound. The parallel processed audio is combined in a sound mixer and tube harmonics are added to the output from the mixer. The tube harmonics added audio is fed to a highpass filter which sets a frequency limit of audio passing through this block. A low pass filter movines the audio in a plus or minus direction with a dynamic envelope control. A frequency divider is provided for shifting audio sound below a selected frequency down an octave. Output from this stage is edited by feeding a certain amount of each side of the audio to a corresponding opposite side. The frequency balance is adjusted by setting a band phase coherent equalizer for frequency adjustments. The original, unprocessed sound is then mixed with the processed audio.
    Type: Application
    Filed: March 21, 2014
    Publication date: January 1, 2015
    Applicant: Max Sound Corporation
    Inventor: Lloyd Trammell
  • Patent number: 8923531
    Abstract: A speaker that includes a pair of spaced-apart, in-plane mounted drivers connected in series to a network for applying the appropriate frequency component of the electrical input drive signal to each of the drivers is disclosed. A frequency dependent shunting network, such as a low pass filter, is applied to one of the drivers so as to gradually mute the one driver as a desired frequency is approached. The result is an aesthetically pleasing speaker that has dual in-plane drivers and that produces superior sound quality throughout the entire frequency range of the speaker, including those ranges in which dual, in plane, drivers tend to acoustically interfere with each other.
    Type: Grant
    Filed: July 14, 2011
    Date of Patent: December 30, 2014
    Assignee: Logitech Europe S.A.
    Inventors: Jason N. Linse, Jeffrey S. Anderson
  • Patent number: 8897463
    Abstract: A canalphone system may include a canalphone housing, and a first high frequency driver carried within the canalphone housing. The system may also include a second high frequency driver carried within the canalphone housing where the second high frequency driver is tuned with the first high frequency driver to deliver lower distortion than a standard canalphone high frequency driver and/or lower distortion than two standard canalphone high frequency drivers that are not tuned with each other.
    Type: Grant
    Filed: May 26, 2010
    Date of Patent: November 25, 2014
    Inventor: Jerry Harvey
  • Patent number: 8880205
    Abstract: Integrated processing of multimedia signals can eliminate unnecessary signal processors and converters without losing the functionality of typical home entertainment system components. The integrated multimedia system includes a main player that captures and processes signals digitally. The main player may adjust the audio signal to provide audio output of equal loudness across all frequencies by accounting for sensitivity of the human ear for sounds of varying frequencies. The main player can also account for perceived differences in loudness based on the angle of a listener to a speaker by detecting the position of a user and making an adjustment accordingly. The invention further provides a speaker that has embedded performance characteristics or an identifier that allows the system to provide an optimal speaker driving current for a particular system or determine how that speaker would be best implemented in the integrated system.
    Type: Grant
    Filed: August 16, 2005
    Date of Patent: November 4, 2014
    Assignee: Mondo Systems, Inc.
    Inventor: Chul Chung
  • Patent number: 8873787
    Abstract: A speaker arrangement comprises a first sound transducer (101) for reproducing sound in a lower frequency range and having a first on-axis direction and a first center point. The arrangement further comprises a second sound transducer (103) for reproducing sound in a higher frequency range, the second sound transducer (103) being mounted in front of the first sound transducer and having a second on-axis direction and a second center point. The transducers are positioned such that an angle between the first on-axis direction and the second on-axis direction is between 45° and 135°, and such that the distance between the first center point and the second center point is not higher than a cross-over wavelength corresponding to the cross-over frequency. The cross-over frequency between the lower frequency range and the higher frequency range is selected to be within the interval from 1.5 kHz to 3 kHz. An improved point source approximation may be achieved.
    Type: Grant
    Filed: October 26, 2009
    Date of Patent: October 28, 2014
    Assignee: Konindlijke Philips N.V.
    Inventors: Julien Laurent Bergere, Benoit Burette
  • Patent number: 8848943
    Abstract: A signal processing device for supplying sound signals to a first speaker for emitting a sound on a low-pitched sound side and a second speaker for emitting a sound on a high-pitched sound side higher than the low-pitched sound side, includes a control portion that controls a characteristic of the sound signal supplied to the first speaker so that an output level of the first speaker is maintained at a crossover frequency between the first speaker and the second speaker, when an output level of the sound signal supplied to the first speaker is changed.
    Type: Grant
    Filed: September 1, 2009
    Date of Patent: September 30, 2014
    Assignee: Yamaha Corporation
    Inventor: Masaki Katayama
  • 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: 8774424
    Abstract: Apparatus for reproducing sound including at least three loudspeakers (5, 6, 7) mounted in a substantially sealed enclosure. The three loudspeakers may be mounted to a wall of the enclosure so that they are all directed away from, and evenly spaced around, a common point. Two speakers may be driven with the respective out of phase signals comprising the difference between two stereo channels and another speaker with the sum of those channels.
    Type: Grant
    Filed: November 18, 2009
    Date of Patent: July 8, 2014
    Assignee: Airsound LLP
    Inventor: Stuart Fletcher
  • Publication number: 20140177871
    Abstract: Frequency response correction systems and methods for consumer electronic (CE) devices are disclosed. Applying one or more of disclosed techniques can improve a consumer's listening experience. The frequency response of a CE device can be corrected to remove or attenuate salient, undesirable features of with minimal user interaction. Audio quality can be tuned for optimal or near optimal performance even at maximum or near maximum volume levels substantially without fluctuations, clipping, or any other distortions. In some embodiments, audio response of the CE device can be captured, smoothed, and corrected. Correction parameters can be stored on the CE device.
    Type: Application
    Filed: December 26, 2012
    Publication date: June 26, 2014
    Applicant: DTS LLC
    Inventors: DOUG MORTON, JAMES TRACEY, ALEXANDRA SCHOEPEL
  • Patent number: 8737644
    Abstract: A reproducing apparatus includes: a digital signal processing block configured to execute first boost processing for setting a volume level for an entered digital audio signal and boosting an amplitude level of the signal; a digital-to-analog conversion block configured to convert the digital audio signal into an analog one; an analog signal processing block configured to execute second boost processing for boosting an amplitude level of the analog audio signal; an analog volume adjusting block configured to set a volume level for the analog audio signal from the analog signal processing block; a loudspeaker configured to output the analog audio signal from the analog volume adjusting block; an operating block configured to indicate a volume level of an audio signal from the loudspeaker and turn on/off the boost processing for the audio signals; and a control block configured to control components in accordance with an operation by the operating block.
    Type: Grant
    Filed: May 13, 2009
    Date of Patent: May 27, 2014
    Assignee: Sony Corporation
    Inventor: Yasuyuki Kino
  • Publication number: 20140093096
    Abstract: Methods and systems are provided for adjusting a crossover frequency between a plurality of audio speakers rendering audio content. In one example, a first subset of a plurality of audio speakers may be rendering a first sub-range of a range of audio frequencies of an audio content, and a second subset of speakers of the plurality of audio speakers may be rendering a second sub-range of the range of audio frequencies. In this example, the first sub-range and the second sub-range may be substantially separated at the crossover frequency. In one case, a playback volume at which the audio content is being rendered may be adjusted. In one instance, the crossover frequency may be adjusted in response to the volume adjustment to improve the audio content rendering quality by the respective subsets of audio speakers in the plurality of audio speakers.
    Type: Application
    Filed: September 28, 2012
    Publication date: April 3, 2014
    Inventors: Timothy W. Sheen, Michael Darrell Andrew Ericson, William H. Bush