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30 results about "Parametric loudspeaker" patented technology
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Parametric Loudspeaker System And Method For Enabling Isolated Listening To Audio Material
InactiveUS20070211574A1Near-field transmissionTransducers for sound channels pluralitySonificationCarrier signal
A virtual headset for enabling isolated listening to audio material by a listener without need for earphones or other physical audio producing devices attached to the listener. The virtual headset includes a parametric ultrasonic signal source 504 supplying at least a first parametric ultrasonic channel signal comprised of an ultrasonic carrier signal and at least one sideband, and configured to be emitted and directed substantially exclusively at a first ear 506 of the listener 502. The parametric ultrasonic signal source is coupled to an electro-acoustical emitter structure, which is configured to emit and direct a first parametric ultrasonic wave corresponding to the first parametric ultrasonic channel signal at the listener such that a first resultant decoupled audio wave will be heard substantially exclusively at the first ear of the listener, with minimal audible sound at a second ear 514 of the listener.
Owner:TURTLE BEACH
Sound reproducing device
A sound reproducing device includes parametric speakers disposed to a display, a loudspeaker, drivers, a human-body sensor, and a controller. The loudspeaker has a wider directivity than the parametric speakers. The drivers change directions of the parametric speakers, respectively. The parametric speakers and the drivers constitute at least two parametric speaker units each composed of respective one of the parametric speakers and respective one of the drivers. The controller reproduces sound information based the number of persons in front of the display detected from an output from the human-body senor. The sound reproducing device reduces the possibility for a number of persons to hear the sound noisily, and allows drawing more attention to the content, e.g. an advertisement.
Owner:PANASONIC CORP
Power amplification for parametric loudspeakers
InactiveUS7319763B2Improve power efficiencyNear-field transmissionNegative-feedback-circuit arrangementsSonificationAudio power amplifier
A power amplifier for a parametric loudspeaker system which utilizes switch-mode power conversion to increase efficiency. The power amplifier is configured to coordinate the switching frequency of the amplifier with the carrier frequency of the parametric loudspeaker system, so a lower switching frequency may be used even though the power amplifier must amplify ultrasonic signals. The amplifier can be further optimized to counteract the reactance of the transducer load at the carrier frequency.
Owner:TURTLE BEACH
System and method for delivering audio-visual content along a customer waiting line
InactiveUS20060280315A1Minimize distractionContributes to background noiseMicrophonesSignal processingInteraction pointDisplay device
A system for providing audio information to persons in an approach path (12) includes an interaction point (14), and an approach path (12) leading to the interaction point. A parametric sound system (18) is provided, which includes a parametric speaker (20) disposed adjacent to the interaction point. The parametric sound system is configured for limited delivery of sound in a spatially limited audio zone (24) along the approach path (12), within a decibel level above ambient noise levels in the area of the interaction point (14), and sufficiently high to be heard primarily by a person progressing along the approach path (12). The interaction point can be a cashier station, and the system can also include a video display (16) configured to provide video information to persons in the approach path along with the audio information.
Owner:AMERICAN TECH
System for playback of pre-encoded signals through a parametric loudspeaker system
InactiveUS7343017B2Near-field transmissionSonic/ultrasonic/infrasonic transmissionPrecodingCarrier signal
A method and system for generating parametric output directly from a prerecorded and error corrected parametric signal for playback in a parametric loudspeaker system. The method includes the step of retrieving a pre-encoded audio signal from an electronically readable storage medium. In addition, an ultrasonic carrier signal has at least one sideband which represents the pre-encoded audio signal. The next step is playing back the pre-encoded audio signal through an ultrasonic amplifier and emitter.
Owner:TURTLE BEACH
Distance estimation using sound signals
An apparatus comprises a test signal generator (401) which generates an ultrasonic test signal by modulating an audio band test signal on an ultrasonic signal. The ultrasonic test signal is radiated from a parametric loudspeaker (403) and is demodulated by non-linearities in the air. A reflected audio signal may arise from reflections of an object, such as a wall. An audio band sensor (405) generates an audio band captured signal which comprises the demodulated reflected audio band signal. A distance circuit (407) then generates a distance estimate for the distance from the parametric loudspeaker (403) to the object in response to a comparison of the audio band captured signal and the audio band test signal. Specifically two signals may be correlated to determine a delay corresponding to the full path length. Based on the distance estimates an audio environment may be estimated and a sound system may be adapted accordingly.
Owner:KONINK PHILIPS ELECTRONICS NV
Parametric loudspeaker with improved phase characteristics
InactiveUS8199931B1Increase productionOutput maximizationPiezoelectric/electrostrictive transducersMagnetostrictive transducersSonificationCarrier signal
Owner:TURTLE BEACH
Parametric audio system for operation in a saturated air medium
InactiveUS7596229B2High levelMinimization requirementsPiezoelectric/electrostrictive transducersMagnetostrictive transducersSonificationEngineering
A parametric loudspeaker system and method for reducing distortion in a decoupled audio wave by creating a double sideband parametric ultrasonic signal that substantially approximates a non-square-rooted modulation envelope and emitting a parametric ultrasonic wave that corresponds to the double sideband parametric ultrasonic signal from a parametric loudspeaker at a sufficient amplitude to drive the surrounding air into saturation.
Owner:TURTLE BEACH
Waking alarm with detection and aiming of an alarm signal at a single person
InactiveUS9513602B1Piezoelectric/electrostrictive transducersMagnetostrictive transducersEngineeringLED lamp
An alarm clock is mounted above a bed and uses a thermal sensor to identify the location of each person sleeping in the bed and to direct light and sound to only one of them for the purpose of selectively waking only that individual. A platform is driven to scan across the bed, and has an infrared sensor creating a temperature profile with a thermal signature indicating the position of each occupant. Platform electronics generate a narrow beam LED light, and an array of ultrasonic speakers serves as a parametric speaker producing a narrow sound beam heard only by the targeted sleeper. At a preset time the alarm is triggered and the platform is pointed at the targeted sleeper identified by his or her infrared thermal signature. The LED light is driven from low to high to simulate dawn. Following maximum brightness, the parametric speaker emits a wake-up audio.
Owner:LUCERA LABS INC
Directed acoustic sound system
ActiveUS8538036B2Improve directivityAvoid distracting coworkersPublic address systemsLine-transmissionAudio power amplifierCarrier signal
Owner:POMPEI FRANK JOSEPH
Parametric loudspeaker with electro-acoustical disphragm transducer
InactiveCN1620195APiezoelectric/electrostrictive transducersElectrostatic transducer loudspeakersSonificationShortest distance
A parametric loudspeaker that produces multiple high frequencies directly so that lower frequencies are indirectly created by a substantially monolithic large-area membrane transducer that is larger in diameter or cross-section than the wavelength of the carrier frequency. One configuration includes a movable diaphragm extending along the core member and moving a short distance in a stronger portion of a magnetic field. At least one low-mass planar conductive coil is disposed on the movable diaphragm and includes first and second contacts such that current flow through the coil produces a first magnetic field that attracts and repels the diaphragm at a desired frequency to produce a magnetic field that can be adjusted to A compression wave sequence comprising an ultrasound frequency range.
Owner:AMERICAN TECH
Parametric sound system with lower sideband
InactiveUS20050185800A1Near-field transmissionPiezoelectric/electrostrictive transducersCarrier signalEngineering
This invention provides a parametric loudspeaker system, with a carrier frequency generator to produce a carrier frequency. A modulator receives an audio signal and modulates it onto the carrier frequency, producing a modulated signal. This modulation creates at least one sideband signal that is divergent from the carrier frequency by the frequency value of the audio signal. Additionally, the sideband signal is created such that its frequency value is lower than the frequency of the carrier.
Owner:AMERICAN TECH
Driving of parametric loudspeakers
InactiveUS20130121500A1Increase motivationImprove audio qualityEar treatmentLoudspeakersQuadrature modulationSingle-sideband modulation
A parametric loudspeaker system comprises a pre-compensator (305) for generating a pre-compensated envelope signal by applying a pre-compensation to the input audio signal where the pre-compensation compensates for distortion of in-air demodulation of the modulated ultrasound signal. A pre-modulator (307) generates a complex base band signal generating a phase signal from the pre-compensated envelope signal using a predetermined function for determining a phase signal from an amplitude signal such that the corresponding complex signal has either suppressed negative or positive frequencies. The complex base band signal is then generated to have an amplitude corresponding to the pre-compensated envelope signal and a phase corresponding to the phase signal. A modulator (309) quadrature modulates the complex base band signal on an ultrasonic quadrature carrier and an output circuit (311) drives the ultrasound transducer (301) from the modulated signal. The invention may allow effective yet low resource pre-compensation for a suppressed or single sideband modulated modulated ultrasound signal.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
Power amplification for parametric loudspeakers
InactiveUS20080175404A1Minimizes reactancePower amplifiersLow frequency amplifiersAudio power amplifierTransducer
A method for minimizing the reactance of a reactive load transducer at a carrier frequency in an amplifier with a power output stage for amplifying a signal, comprises: supplying a signal to the power output stage of the amplifier which includes at least one reactive component coupled to the amplifier; and counteracting transducer reactance at a carrier frequency by interacting the signal with the at least one reactive component.
Owner:LRAD CORPORATION
Driving of parametric loudspeakers
InactiveCN103004234ALower conversion rateEasy to implementLoudspeakersPiezoelectric/electrostrictive transducersSonificationSignal on
Owner:KONINK PHILIPS ELECTRONICS NV
Loudspeaker overload protection
A loudspeaker overload protection circuit and method receives at a compressor a signal representing the estimated loudspeaker power consumption; receives at the compressor a signal representing the nominal power of the loudspeaker; receives at the compressor an input audio signal from the signal source and supplying with the compressor an output audio signal to the loudspeaker; estimates from the output audio signal, (a) signal(s) that represent(s) the voltage and / or current supplied to the loudspeaker and a parameter that represents the ohmic resistance of the loudspeaker the power consumed by the loudspeaker; supplies a signal representing the estimated loudspeaker power consumption to the compressor; and attenuates the input audio signal when the signal representing the estimated loudspeaker power consumption exceeds the signal representing the nominal power of the loudspeaker.
Owner:HARMAN BECKER AUTOMOTIVE SYST
Sound reproducing device
A sound reproducing device includes parametric speakers disposed to a display, a loudspeaker, drivers, a human-body sensor, and a controller. The loudspeaker has a wider directivity than the parametric speakers. The drivers change directions of the parametric speakers, respectively. The parametric speakers and the drivers constitute at least two parametric speaker units each composed of respective one of the parametric speakers and respective one of the drivers. The controller reproduces sound information based the number of persons in front of the display detected from an output from the human-body senor. The sound reproducing device reduces the possibility for a number of persons to hear the sound noisily, and allows drawing more attention to the content, e.g. an advertisement.
Owner:PANASONIC CORP
Modeling loudspeakers based on cascading lumped parameter models with neural networks
ActiveUS20160323685A1Efficient and accurate simulationEfficient and accurateTransducer protection circuitsLimiting amplitudeEngineeringParametric loudspeaker
In one embodiment of the present invention, a loudspeaker modeling subsystem configures a neural lumped parameter loudspeaker (NeLP) model to represent the behavior of a loudspeaker. The NeLP model is implemented as a cascaded combination of a lumped parameter model (LPM) and a neural network (NN) model. To configure the model, the loudspeaker modeling subsystem first estimates values for the parameters used in the LPM. The loudspeaker modeling subsystem then “fixes” these parameters and trains the NN model to act on a predicted output pressure that is generated via the LPM. More specifically, the loudspeaker modeling subsystem configures the NN to modify the predicted output pressure to minimize the error between the predicted output pressure and a measured loudspeaker output pressure. Notably, by strategically fusing the LPM and the NN model, the NeLP model leverages the strengths and mitigates the weaknesses typically associated with conventional loudspeaker modeling techniques.
Owner:HARMAN INT IND INC
Parametric audio system for operation in a saturated air medium
InactiveUS20050281413A1Minimized size requirementHigher acoustic output levelPiezoelectric/electrostrictive transducersMagnetostrictive transducersEngineeringSideband
A parametric loudspeaker system and method for reducing distortion in a decoupled audio wave by creating a double sideband parametric ultrasonic signal that substantially approximates a non-square-rooted modulation envelope and emitting a parametric ultrasonic wave that corresponds to the double sideband parametric ultrasonic signal from a parametric loudspeaker at a sufficient amplitude to drive the surrounding air into saturation.
Owner:TURTLE BEACH
Method for local reduction of the operating noise produced by a medical diagnostic or therapy device, and medical diagnostic or therapy device having a device for implementing such a method
InactiveUS6954666B2Convenient ArrangementLimit sound levelUltrasonic/sonic/infrasonic diagnosticsSurgerySound sourcesTherapeutic Devices
In a method for local reduction of the operating noise produced by a medical diagnostic or therapy device, antisound is produced locally by a sound source. The sound source used is a highly directional parametric loudspeaker. As a result, disturbing operating noises can be limited locally and suppressed effectively.
Owner:SIEMENS AG
Sound reproducing device
Owner:PANASONIC CORP
Portable device and method of outputting notification sound
InactiveUS20140135075A1Reliably madeSharp directivityPiezoelectric/electrostrictive transducersDevices with sensorComputer scienceParametric loudspeaker
A portable device includes plural parametric speakers that each output a sound having directivity in an individual specific direction; an attitude detecting unit that detects an attitude of the portable device; and a selecting unit that selects, from among the plural parametric speakers, a parametric speaker that outputs a sound having directivity whose direction falls within a predetermined range of an angle relative to a predetermined direction, on the basis of information on the attitude detected by the attitude detecting unit, and causes only the selected parametric speaker to output a predetermined notification sound.
Owner:NEC CASIO MOBILE COMMUNICATIONS LTD
Electronic device
InactiveUS20130216082A1Small sizeSingle transducer incorporationPiezoelectric/electrostrictive transducersEngineeringDemodulation
Disclosed is an electronic device including: a housing (110) in which at least one sound hole (113) and at least one sound hole (114) are formed; an oscillator (120) that is provided inside the housing (110) and outputs a modulated wave for a parametric loudspeaker; a sound demodulation unit (130) that is not provided in the sound hole (113) but provided in the sound hole (114) and demodulates the modulated wave; and a sound hole opening and closing unit (112) that is mounted to the housing (110) and opens and closes the sound hole (113).
Owner:NEC CORP
Giant magnetostrictive rare-earth transducer for parametric loudspeaker
A giant magnetostrictive rare-earth transducer for a parametric loudspeaker comprises a bottom board, a giant magnetostrictive rare-earth rod, a coil, a telescopic rod cavity, vibrating plate fixing screws, a vibrating plate, elastic ring fixing screws, a fixed elastic ring and bottom board fixing screws. The transducer for the parametric loudspeaker can generate high sound power by the aid of the advantages of high mechanical energy to electric energy conversion rate, high energy density, high response speed, fine reliability and simple driving mode of giant magnetostrictive rare-earth materials at room temperature, and has significance for solving the problem of low output sound power of a parametric array loudspeaker.
Owner:CIVIL AVIATION FLIGHT UNIV OF CHINA
Driving of parametric loudspeakers
InactiveUS9078062B2Increase motivationImprove audio qualityEar treatmentLoudspeakersSonificationSignal on
Owner:KONINK PHILIPS ELECTRONICS NV
Electronic device
InactiveUS9253557B2Small sizeSingle transducer incorporationPiezoelectric/electrostrictive transducersEngineeringDemodulation
Disclosed is an electronic device including: a housing (110) in which at least one sound hole (113) and at least one sound hole (114) are formed; an oscillator (120) that is provided inside the housing (110) and outputs a modulated wave for a parametric loudspeaker; a sound demodulation unit (130) that is not provided in the sound hole (113) but provided in the sound hole (114) and demodulates the modulated wave; and a sound hole opening and closing unit (112) that is mounted to the housing (110) and opens and closes the sound hole (113).
Owner:NEC CORP
Directed sound transmission systems and methods
Systems and methods are provided herein for directing sound through a parametric speaker in connection with interpreting / translating messages in an open forum such that communications may be delivered and understood without the use of headphones. The directed sound may also be directed in connection with detecting auditory areas and targeting sound at the auditory regions of a subject.
Owner:ZAPS LABS INC
Modeling loudspeakers based on cascading lumped parameter models with neural networks
ActiveUS9628926B2Efficient and accurate simulationEfficient and accurateTransducer protection circuitsLimiting amplitudeEngineeringParametric loudspeaker
In one embodiment of the present invention, a loudspeaker modeling subsystem configures a neural lumped parameter loudspeaker (NeLP) model to represent the behavior of a loudspeaker. The NeLP model is implemented as a cascaded combination of a lumped parameter model (LPM) and a neural network (NN) model. To configure the model, the loudspeaker modeling subsystem first estimates values for the parameters used in the LPM. The loudspeaker modeling subsystem then “fixes” these parameters and trains the NN model to act on a predicted output pressure that is generated via the LPM. More specifically, the loudspeaker modeling subsystem configures the NN to modify the predicted output pressure to minimize the error between the predicted output pressure and a measured loudspeaker output pressure. Notably, by strategically fusing the LPM and the NN model, the NeLP model leverages the strengths and mitigates the weaknesses typically associated with conventional loudspeaker modeling techniques.
Owner:HARMAN INT IND INC
In-vehicle sound partition control device and method, controller and medium
ActiveCN110234048BWidely used valueTo achieve directed transmissionSignal processingTransducer circuitsDriver/operatorEngineering
The present invention relates to a sound zone control device and method in a vehicle, a controller and a medium. The device includes a main control module, a power amplifier module and a plurality of directional transmission modules. There is a channel between the power amplifier module and each directional transmission module. The transmission module corresponds to a sound area in the car; the main control module is configured to determine the channel to be sent by the audio signal, obtain the channel number to be sent, and send the channel number and the audio signal to the power amplifier module; the power amplifier module is configured to transmit the audio signal The signal is amplified by a preset multiple, and the amplified audio signal is sent to the directional transmission module corresponding to the channel number to be sent; the directional transmission module is configured to directional transmit the amplified audio signal to the corresponding sound area. Based on the strong directivity of the parametric loudspeaker, the invention realizes the directional transmission of the sound, so that the driver and passengers in the car only receive the sound related to it, which is simple and easy to implement, has strong adaptability to the whole vehicle environment, and has wider and more flexible applications.
Owner:NIO CO LTD
Vehicle existence notification apparatus
InactiveCN102673470ALow costNon-electrical signal transmission systemsAcoustic signal devicesElectricitySonification
A vehicle existence notification apparatus, disposed in a vehicle, emits a notification sound to notify the surrounding area of the approach or presence of the vehicle. The vehicle existence notification apparatus includes a parametric speaker that serves as a supersonic speaker for emitting a supersonic sound wave, where the parametric speaker performs supersonic modulation to a notification sound signal, which produces the notification sound. The parametric speaker also serves as an audible-sound generating piezoelectric speaker that has a primary resonance component that vibrates at a frequency in an audible frequency band. The parametric speaker sets a supersonic modulation frequency of the notification sound to a sound-pressure increase frequency in a supersonic frequency band reproducible by the audible-sound generating piezoelectric speaker, at which a sound pressure increases due to a high order harmonic resonance.
Owner:DENSO CORP
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