142results 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.

The present disclosure is of a bone conduction microphone. The bone conduction microphone comprises of a laminated structure and a base structure. The laminated structure is formed by a vibration unit and an acoustic transducer unit. The base structure is configured to load the laminated structure. At least one side of the laminated structure is physically connected to the base structure. The base structure vibrates based on an external vibration signal, the vibration unit deforms in response to the vibration of the base structure, and the acoustic transducer unit generates an electrical signal based on the deformation of the vibration unit. A resonant frequency of the bone conduction microphone is within a range of 2.5 kHz-4.5 KHz.

The invention provides a sound transmission device which can transmit clear sound to a user without damaging the user and can be actually used. This sound transmission device (1) is provided with: a transducer (2); a transmission plate (3) that transmits vibration to the bone of the head of a person; a housing (4) that houses the transducer (2); and a ring member (7) that is disposed so as to cover the side surface of the housing (4). Furthermore, the transducer (2) includes a giant magnetostrictive element (21), permanent magnets (22a, 22b) disposed at both ends of the giant magnetostrictive element (21), and a coil (23), and the permanent magnet (22a) disposed at one end is connected to the transmission plate (3). The housing (4) is configured so as to include a housing part (41) that houses the transducer (2), and a counterweight body (42) that is connected to the permanent magnet (22b) disposed at the other end. In addition, the ring member (7) holds the side surface of the housing (4) via the damper member (6).

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.

A method and device for treating tinnitus and / or hearing impairment of a user at bedtime includes providing an audio stimulus to the user using a parametric array speaker. Some embodiments treat tinnitus by removing a frequency notch corresponding to the user's tinnitus frequencies from the audio signal. The audio signal may be ambient sound detected by a microphone, or may be a prerecorded file which may comprise noise or other audio such as audiobooks or music. Some embodiments combine treatment of tinnitus or hearing impairment with treatment for apnea, hypopnea or snoring.

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.

The present invention discloses an antibacterial electric toothbrush and antibacterial method based on the principle of pulsed ultrasonic piezoelectric response. The electric toothbrush of the present invention includes a toothbrush head and a driving mechanism for driving the vibration of the toothbrush head, the driving mechanism being configured to generate low-intensity pulsed ultrasonic waves. The toothbrush head is equipped with a piezoelectric brush, and the ultrasonic vibrations enhance the electrical response of the piezoelectric brush, thereby achieving excellent antibacterial effects. The electric toothbrush of the present invention not only effectively inhibits bacteria in the toothbrush head when it is placed stationary, but also has improved antibacterial activity during tooth brushing, effectively inhibiting plaque and preventing oral diseases such as periodontal disease.

Disclosed in the present invention are an antibacterial electric toothbrush based on a pulsed ultrasonic piezoelectric response principle, and an antibacterial method. The electric toothbrush in the present invention comprises a toothbrush head and a driving mechanism for driving the toothbrush head to vibrate, wherein the driving mechanism is configured to generate low-intensity pulsed ultrasonic waves, and the toothbrush head is provided with piezoelectric bristles and enhances the electric responsiveness of the piezoelectric bristles by means of ultrasonic vibration, such that a good antibacterial effect is achieved. The provided electric toothbrush can not only effectively inhibit the growth of bacteria on a standing toothbrush head, but also has improved antibacterial activity during a tooth-brushing operation process, such that dental plaque can be effectively inhibited, and oral diseases, such as periodontitis, can be effectively prevented.

The embodiments of the present disclosure provide an acoustic output device, including: a first piezoelectric element configured to generate vibrations based on an audio signal; a fixing structure configured to place the acoustic output device near a user's ear without blocking the user's ear canal, an end of the fixing structure being connected to one end of the first piezoelectric element; and a vibration transmission component including an ear hook and an output assembly, one end of the ear hook being connected to an end of the first piezoelectric element away from the fixing structure, the other end of the ear hook being connected to the output assembly, the output assembly receiving the vibrations of the first piezoelectric element through the ear hook and outputting sound, and a frequency response curve of the sound having at least two resonant peaks.

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 discloses an air pulse generating device. The air pulse generating device comprises a chamber, a modulation part and a demodulation part, wherein the modulation part is used for generating amplitude modulation ultrasonic waves in the chamber, and the demodulation part is used for generating a plurality of ultrasonic pulses according to the amplitude modulation ultrasonic waves in the chamber. The demodulator periodically forms an opening at a frequency, which is an operating frequency of the modulator. The opening communicates air within the chamber to the ambient environment. The amplitude of the amplitude modulation ultrasonic wave is generated according to an input signal. The plurality of ultrasonic pulses correspond to an input signal.

The present invention relates to the technical field of electroacoustics, and in particular to an ultrasonic loudspeaker comprising: a magnetic circuit system for providing the loudspeaker with a magnetic field; a frame provided in a hollow way, the magnetic circuit system being fixed in the frame; an FPC lapped and fixed on the frame, a portion of the FPC in a hollow portion of the frame being elastic; a diaphragm attached and fixed to the FPC in parallel; a voice coil with a top fixed to the FPC and a remaining portion extending into the hollow portion of the frame; and an ultrasonic driver fixed to the FPC and attached and connected to the diaphragm. When powered, the voice coil drives the diaphragm via the FPC to generate first sound pressure while the ultrasonic driver produces second sound pressure, their combination forming ultrasonic grade frequency response for high-resolution audio reproduction.

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.

A system comprising sound wave sensors for high fidelity sound wave detection from any 3D directions and identification of 3D coordinates of sound sources, means to separate the sound emanations of each sound source with good to high fidelity, and means to reconstruct sound sources with good to high fidelity generally including its lobal patterns. The system enables microphones systems capable of detecting sound with substantially high linearity in frequency response, sensitivity, and directionality, combined with any desired form of volumetric sensing such as spherical, hemispherical, conic and so forth, including multiple defined lobes, or selecting any desired volume and shape. Sound wave sensors can comprise a multitude or combinations of system means such as sound beams, levitated bubble interactions, tethered bubble interactions, fibre interactions, laser interferometry, RF tuned circuit techniques, and so forth, wherein all such methods ultimately employ a form of bidirectional sound sensing means.

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.

An acoustic energy tool comprising a crystal for generating acoustic energy when a volage is applied to the crystal, and a resonator. The resonator has a solid outer structure with the crystal being attached to the solid outer structure, with the resonator being comprised of a material that transmits the acoustic energy through the resonator. The tool includes a curved surface that focuses the acoustic energy being transmitted through the resonator and a fluid passageway that extends through the resonator for allowing a fluid to flow through the resonator. The acoustic energy being focused by the curved surface is concentrated in the fluid passageway so that it causes cavitation of the fluid in at least part of the fluid passageway. The cavitation of the fluid is used to break up clumps that form in the fluid or to generate reactive oxygen species.

The invention relates to MEMS loudspeakers comprising at least one pump chamber within which an individually controllable piston is movably arranged. A MEMS loudspeaker comprises, for example, two passive valves or, for example, one or more active valves that can be controlled independently of the piston. The moving parts, in particular the pistons and valves, are driven, for example, by ultrasound. The invention further relates to systems for generating an audio signal, devices for generating an audio signal as well as a computer program and a machine-readable storage medium.

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

To provide a sound suppression device, a sound suppression system, and a wearable sound device that can suppress broadband noise.SOLUTION: A sound suppression device comprises: a sound sensing device configured to sense sound; and a sound generation device having an air pulse generation device configured to generate multiple air pulses at an ultrasonic pulse rate. The multiple air pulses at the ultrasonic pulse rate form an anti-sound. The anti-sound includes a component configured to suppress the sound.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.

A micro-speaker for use in hearing and other body worn devices is disclosed, including an acoustic conduit defining an acoustic path between first and second air spaces. A first acoustic transducer is located between the acoustic conduit and the first air space and a second acoustic transducer located between the acoustic conduit and the second air space. The second acoustic transducer is operable to more or less obstruct an acoustic aperture between the acoustic conduit and the second air space, wherein concurrent operation of the first and second acoustic transducers generates an acoustic audio signal that propagates between the first and second air spaces. An acoustic vent between the acoustic conduit and the second air space has an acoustic impedance that is independent of the operation of the second acoustic transducer.

An acoustic energy tool comprising a crystal for generating acoustic energy when a volage is applied to the crystal, and a resonator. The resonator has a solid outer structure with the crystal being attached to the solid outer structure, with the resonator being comprised of a material that transmits the acoustic energy through the resonator. The tool includes a curved surface that focuses the acoustic energy being transmitted through the resonator and a fluid passageway that extends through the resonator for allowing a fluid to flow through the resonator. The acoustic energy being focused by the curved surface is concentrated in the fluid passageway so that it causes cavitation of the fluid in at least part of the fluid passageway. The cavitation of the fluid is used to break up clumps that form in the fluid or to generate reactive oxygen species.