93results about "Magnetostrictive transducers" patented technology

A controller configured to control a sound producing module includes a volume controlling unit configured to determine a demodulation amplitude and a modulation amplitude corresponding to a target volume. The sound producing module comprises a driving circuit and an air-pulse generating device. The driving circuit generates a demodulation driving signal according to the demodulation amplitude and generates a modulation driving signal according to the modulation amplitude, so as to drive the air-pulse generating device. The air-pulse generating device produces sound via generating a plurality of air pulses at an ultrasonic pulse rate.

A method and electronic consumer device for creating an individual spatial listening zone for a user provided. The method includes receiving an input audio signal and processing it to generate first and second ultrasonic electric audio signals. The ultrasonic signals are provided to first and second ultrasonic transducers which convert them into directional ultrasonic acoustic signals. These signals are directed to a spatial listening zone where the user is located. Through non-linear interaction of the ultrasonic signals in air within the spatial listening zone, an audible sound signal is produced for the user that corresponds to the desired audio based on the input signal. The audible sound is substantially confined to the spatial listening zone and inaudible outside it. Various techniques for dynamically adjusting the spatial listening zone based on user position are disclosed. The system allows for creation of personalized audio experiences while minimizing disturbance to others nearby.

A textile enabling control related to sound output is to be provided. A textile according to the present application is characterized by being formed to include foil of an organic piezoelectric film.

Provided with a voice transmission device that can deliver clear voice to a user without invading the user and can be practically used. A voice transmission device 1 of the present disclosure includes: a transducer 2; a transmission plate 3 configured to transmit a mechanical vibration to a bone of a head of a person; a housing 4 that houses the transducer 2; and a ring member 7 arranged to cover a side surface of the housing 4. The transducer includes: a magnetostrictive element 21; permanent magnets 22a, 22b arranged at both ends of the magnetostrictive element 21; and a coil 23. The permanent magnet 22a arranged at one end of the magnetostrictive element 21 is connected to a transmission plate 3. The housing 4 includes: a housing portion 41 that houses the transducer 2; and a counter mass 42 connected to the permanent magnet 22b arranged at the other end. The ring member 7 holds a side surface of the housing 4 via a damper member 6.

The invention provides a sounder and a wearable sound device. The sounder comprises an airflow generator used for generating airflow, a first resonant cavity and a second resonant cavity. The second resonant cavity is stacked on the first resonant cavity. The sound is generated by the airflow generated by the airflow generator passing through the first resonant cavity and the second resonant cavity.

An acoustic system and an in-vehicle communication support system that increase the audible sound reproduction level of a parametric loudspeaker while mitigating disadvantages of ultrasonic radiation are provided. An ultrasonic wave amplitude-modulated with audible sound, emitted from a parametric loudspeaker enter an audible sound collector with a high directivity. Of incident ultrasonic wave and incident audible sound self-demodulated from the ultrasonic wave, the audible sound collector attenuates the ultrasonic wave, and reflects the audible sound to be collected at a position near the user. The audible sound collector can be composed of: a reflector having a reflecting surface formed of a paraboloid of revolution; and a sound absorber for absorbing an ultrasonic wave. The sound absorber can be composed of a sound absorbing material made of a phononic crystal, or of resonance tubes.

A reactive filter assembly comprising a reactive filter acoustically coupled to a transducer operable to generate an audio frequency by air nonlinearity demodulation of an ultrasonic frequency, wherein the reactive filter has a number of acoustic passes set to provide the transducer with a radiation impedance to improve the transducer efficiency.

We provide an "acoustic system and in-vehicle communication support system" that increases the audible sound playback level while suppressing the disadvantages of ultrasonic radiation using a parametric speaker. [Solution] Ultrasound amplitude-modulated by audible sound emitted from a parametric speaker 1 is incident with high directionality on an audible sound collector 2. Of the incident ultrasound and audible sound self-demodulated from the ultrasound, the audible sound collector 2 attenuates the ultrasound and reflects the audible sound to collect it at a position near the user. The audible sound collector 2 can be composed of a reflector 21 with a reflective surface of a paraboloid of revolution and a sound absorber 22 that absorbs the ultrasound, and the sound absorber 22 can be composed of a sound-absorbing material using phononic crystals or a resonance tube 221.

The invention relates to an amplified reactance filter for transducer ultrasound. A reactance filter assembly includes a reactance filter acoustically coupled to a transducer operable to generate an audio frequency by air non-linear demodulation of an ultrasonic frequency, the reactance filter having a plurality of auditory conductive pathways tuned to introduce a radiation impedance to the transducer, therefore, the efficiency of the transducer is improved.

The present disclosure discloses a speaker including at least one ultrasound unit, including: a bottom ultrasound component, a plurality of displacement assemblies. The displacement assembly includes a displacement component mounted on the bottom ultrasound component, and a resonance component. The resonance component including at least one Helmholtz resonance chamber is configured to resonate by way of vibration of the displacement component for changing a volume of each of the at least one Helmholtz resonance chamber. An ultrasonic signal emitted by the bottom ultrasound component is demodulated to a low frequency signal in the at least one Helmholtz resonance chamber. The low frequency signal is transmitted to outside through the sound output channel.

A reactive filter assembly comprising a reactive filter acoustically coupled to a transducer operable to generate an audio frequency by air non-linearity demodulation of an ultrasonic frequency, the reactive filter having a number of acoustic pathways tuned to introduce a radiation impedance to the transducer that improves transducer efficiency.

To provide a sound generating device for increasing a sound pressure level (SPL).SOLUTION: The sound producing device includes an airflow generator configured to generate an airflow, a first resonance chamber, and a second resonance chamber. The second resonant chamber is stacked on the first resonant chamber. Sound is produced by the airflow generated by the airflow generator and passing through the first and second resonance chambers. The airflow generator has an airflow pulsing device configured to generate a plurality of airflow pulses at an ultrasonic frequency, wherein the airflow includes the plurality of airflow pulses.SELECTED DRAWING: Figure 3

An ultrasonic projection device 1 for projecting ultrasonic waves includes a first block body 2, a second block body 3, and a piezoelectric unit 4 sandwiched between the first block body 2 and the second block body 3. A vibration plate 6b is provided at one end on the first block body 2 side in the axial direction of the first block body 2, the second block body 3, and the piezoelectric unit 4. The dimension from the one end to the other end on the second block body 3 side in the axial direction approximately coincides with half of the wavelength of vibration generated by the piezoelectric unit 4. A connection portion 6c having a groove 6e with a smooth inner wall surface 6e1 which connects the vibration plate 6b and a base portion 6a is provided between the vibration plate 6b and the base portion 6a which supports the vibration plate 6b.

An ultrasonic pump includes a mechanical layer with at least one membrane; and an acoustic channel. A portion of the at least one membrane comprises at least a part of the acoustic channel so that a movement of the membrane changes the dimension of the acoustic channel. The membrane is configured to oscillate at ultrasonic frequencies and generate at least one audio signal.

To provide an APG device capable of producing asymmetric air pressure pulses.SOLUTION: An air-pulse generating device includes a film structure including a first flap and a second flap opposite to each other. The film structure is actuated to operate at an ultrasonic frequency, and the air-pulse generating device produces a plurality of air pulses at an ultrasonic pulse rate. The first flap and the second flap are actuated to perform a differential movement to form an opening or a virtual valve. A slit is formed between the first flap and the second flap, and the opening or the virtual valve is formed because of the slit. The slit is formed as a zigzagging pattern on the film structure.SELECTED DRAWING: Figure 1

An air-pulse generating device and an airflow generating method are disclosed. An air-pulse generating device includes a flap pair, including a first flap and a second flap opposite to each other. The first flap and the second flap oscillate at an oscillation frequency and oscillate in an out-of-phase fashion with each other; wherein during an oscillation of the flap pair, the flap pair forms a virtual valve or an opening at an opening rate corresponding to the oscillation frequency.

Disclosed are systems and methods utilize networked speaker arrays and audio waveform shaping using interferometric feedback of sound transmitted by the speaker arrays. In further aspects, the systems and method employ an intelligently controlled acoustic device that can focus sound at specific locations and record the acoustic environment / reflected sound to self-calibrate for improved performance. Moreover, the device is modular and scalable with the ability to network distributed speakers to enhance the audio performance.

To further enhance acoustic pressure of ultrasonic waves in an ultrasonic projection device.SOLUTION: An ultrasonic projection device 1 for projecting ultrasonic waves includes: a first block body 2; a second block body 3; and piezoelectric units 4 that are held between the first block body 2 and the second block body 3. A diaphragm 6b is provided at one end on a first block body 2 side in an axial direction of the first block body 2, the second block body 3 and the piezoelectric units 4. A dimension from the one end in the axial direction to the other end on a second block body 3 side is formed so as to substantially coincide with a half wavelength of oscillation generated in the piezoelectric units 4. In between the diaphragm 6b and a base part 6a supporting the diaphragm 6b, a connection part 6c having grooves 6e with smooth inner wall surfaces 6e1 connecting the diaphragm 6b to the base part 6a is provided.SELECTED DRAWING: Figure 1

This invention relates to an on-ear, over-ear, and / or in-ear headphone (1), comprising at least one acoustic transducer (2) for generating and detecting at least ultrasonic waves (3), and a control unit (4) for determining the physical function of a headphone (1) wearer (5) based on the generated and detected ultrasonic waves (3). The at least one acoustic transducer (2) is a MEMS acoustic transducer (2), particularly a broadband MEMS acoustic transducer. A method for determining the physical function of a headphone (1) wearer (5), particularly cardiac and / or respiratory function, is also involved, comprising: generating ultrasonic waves (3) using the MEMS acoustic transducer (2) of the headphone (1); detecting the ultrasonic waves (3) using the MEMS acoustic transducer (2) and / or a microphone; and determining the wearer's (5) physical function by means of the control unit (4) of the headphone (1) based on the generated and detected ultrasonic waves (3). A MEMS acoustic transducer (2) for use in the headphone (1) and / or for determining physical function is also involved.

A vehicle includes a display panel and a transparent sound-generating film. The display panel is mounted on the vehicle's dashboard. The display panel is switchable between a private mode and a public mode. In private mode, the display panel shows visual content that is visible to an occupant of the first seat but not visible to an occupant of the second seat. In public mode, the display panel shows visual content that is visible to both the first and second seat occupants. The transparent sound-generating film is positioned to emit focused sound that is audible to the occupant of the first seat but not audible to the occupant of the second seat. The sound-generating film is laminated to either the display panel or the vehicle's windshield.

A system may comprise a first light source adapted to emit first light; a second light source adapted to emit second light; a beamsplitter adapted to: reflect a portion of the first light as reflected first light, and reflect a portion of the second light as reflected second light. The system may comprise a retroreflector, comprising a retroreflective material and a reflective surface, adapted to: reflect the reflected first light to provide a first image at a first location, and reflect the reflected second light to provide a second image at a second location. The system may comprise a first sound source adapted to output a first sound audible at the first location; a second sound source adapted to output a second sound audible at the second location. The system may comprise a controller adapted to cause the sounds to be output based on the light being emitted.

A computer-implemented system and method for pupil-directed retinal projection in a near-eye display is disclosed. The computer-implemented system provides the smart glasses with directional physical pixels that project light beams / signals directly onto the retina of the user based on the position and size of the pupil. Eyeglasses include a frame, lenses having directional pixel layers, and a sensor for tracking pupil movement. Each directional pixel may generate a plurality of virtual pixels by rapidly changing its emission angle. Glasses are used as prescription lenses, virtual reality displays, and augmented reality devices without conventional optical systems. Additional features include depth sensors, cameras, and connectivity with peripheral devices. According to the glasses, seamless fusion of virtual world experience and real world experience can be realized, so that an immersive mixverse environment is created. Various input methods, including gesture recognition and brain-computer interface, allow for intuitive control and interaction.

1 A method of masking audible sound received at a device, the method comprising: outputting an ultrasonic signal to a transducer, the ultrasonic signal comprising ultrasonic content which, when received at a microphone of the device, is mixed into an audible band of an audio signal generated by the microphone in response to the audible sound and the ultrasonic signal; receiving the audio signal from the microphone; compensating the audio signal in dependence on the ultrasonic signal to obtain a compensated audio signal representing the audible sound.

A method and electronic consumer device for creating an individual spatial listening zone for a user provided. The method includes receiving an input audio signal and processing it to generate first and second ultrasonic electric audio signals. The ultrasonic signals are provided to first and second ultrasonic transducers which convert them into directional ultrasonic acoustic signals. These signals are directed to a spatial listening zone where the user is located. Through non-linear interaction of the ultrasonic signals in air within the spatial listening zone, an audible sound signal is produced for the user that corresponds to the desired audio based on the input signal. The audible sound is substantially confined to the spatial listening zone and inaudible outside it. Various techniques for dynamically adjusting the spatial listening zone based on user position are disclosed. The system allows for creation of personalized audio experiences while minimizing disturbance to others nearby.

An audio converter includes a diaphragm, a converter base structure, and a diaphragm suspension system. The diaphragm suspension system has at least one contact hinge joint coupling the diaphragm to the transducer base structure to enable rotational movement of the diaphragm about a rotational axis relative to the transducer base structure. A conversion mechanism is operably coupled to the diaphragm to convert between the electrical audio signal and the acoustic pressure. In an embodiment, each contact hinge joint includes up to four contact interfaces, where each contact interface has a pair of contact surfaces movable relative to each other. Other embodiments of diaphragm suspension systems, diaphragm structures, conversion mechanisms, and audio devices incorporating the structures are also disclosed.

Devices, systems, and methods herein relate to the measurement of reflected acoustic waveforms to generate vocal data and avoid undesired noise, minimize calibration and set up, and improve continuous usability. These systems, devices, and methods may include transmitting an acoustic waveform through air to a skin of a subject, measuring a reflected acoustic waveform reflected by the skin of the subject, and processing the measured reflected acoustic waveform to generate vocal data of the subject.

A method of masking audible sound received at a device, the method comprising: outputting an ultrasonic signal to a transducer, the ultrasonic signal comprising ultrasonic content which, when received at a microphone of the device, is mixed into an audible band of an audio signal generated by the microphone in response to the audible sound and the ultrasonic signal; receiving the audio signal from the microphone; compensating the audio signal in dependence on the ultrasonic signal to obtain a compensated audio signal representing the audible sound.

To provide a smart volume controller that achieves superior audio fidelity or power efficiency.SOLUTION: A controller configured to control the sound generation module includes a volume control configured to determine a demodulation amplitude and a modulation amplitude corresponding to a target volume. The sound generation module includes a drive circuit and an air pulse generation device. The drive circuit generates a demodulated drive signal according to the demodulated amplitude and generates a modulated drive signal according to the modulated amplitude to drive the air pulse generation device. The air pulse generation device generates sound by generating a plurality of air pulses at an ultrasonic pulse rate.SELECTED DRAWING: Figure 5

A controller configured to control a sound producing module includes a volume controlling unit configured to determine a demodulation amplitude and a modulation amplitude corresponding to a target volume. The sound producing module comprises a driving circuit and an air-pulse generating device. The driving circuit generates a demodulation driving signal according to the demodulation amplitude and generates a modulation driving signal according to the modulation amplitude, so as to drive the air-pulse generating device. The air-pulse generating device produces sound via generating a plurality of air pulses at an ultrasonic pulse rate.

Systems and methods are described herein for utilizing piezoelectric transducer elements arranged in a planar array to generate audio that aligns with objects identified in corresponding visual content, wherein the generated audio enables the user to perceive audio depth and directionality. The disclosed techniques may automatically determine, using image analysis, a virtual region for an identified object corresponding to an audio component in 3D space in relation to a screen of the client device. The disclosed techniques may additionally define an audio wave field based on the virtual region for the identified object and the corresponding audio component and cause the piezoelectric transducer array to transmit an at least one audio wave to generate the audio wave field.