The present invention relates to a device (22) for controlling a loudspeaker in an enclosure, the device (22) comprising: a unit (36) for duplicating a desired dynamic signal (S.sub.dyn) to obtain two identical desired dynamic signals (S.sub.dyn1, S.sub.dyn2), a first processing unit (38) configured to process the first desired dynamic signal (S.sub.dyn1) to obtain a first processed signal (S.sub.dyn1) whereof the frequencies are less than or equal to a predetermined frequency, a second processing unit (40) configured to process the second desired dynamic signal (S.sub.dyn2) to obtain a second processed signal (S.sub.dyn2) whereof the frequencies are strictly greater than the predetermined frequency, and a unit (42) for combining the processed first and second signals (S.sub.dyn1, S.sub.dyn2) to obtain a control signal (S.sub.commande) of the loudspeaker.

An MEMS microphone is provided, comprising a substrate and a vibration diaphragm supported above the substrate by a spacing portion, the substrate, the spacing portion, and the vibration diaphragm enclosing a vacuum chamber, and a static deflection distance of the vibration diaphragm under an atmospheric pressure being less than a distance between the vibration diaphragm and the substrate, wherein: a lower electrode forming a capacitor structure with the vibration diaphragm is provided on the substrate, and an electret layer providing an electric field between the vibration diaphragm and the lower electrode is provided on the substrate

The problem of contaminants entering a microphone assembly through a pressure equalization aperture is mitigated by moving the pressure equalization aperture from a location near the acoustic port to a location on the cover of the microphone assembly. This is achieved by fabricating an aperture reduction structure using a separate dedicated die, with an aperture of diameter 25 microns or less disposed on the aperture reduction structure, and then coupling the aperture reduction structure to the cover of the microphone. The relatively smaller aperture on the cover after the coupling of the aperture reduction structure is used for pressure equalization of the back volume of the microphone with a pressure outside of the microphone assembly.

A sound generator for a vehicle includes: a resonator chamber configured to contact and expand in a longitudinal direction; a membrane disposed on a front open part of the resonator chamber; a cover disposed on a rear open part of the resonator chamber; a connecting pipe connected between the cover and an engine intake system; a magnet disposed on an inner surface of the cover; a coil disposed in a front end part of the resonator chamber; and a sound controller configured to apply an electric current to the coil.

An electro-acoustic transducer includes: a housing; a fixed electrode; a diaphragm that oscillates in accordance with a potential difference between the diaphragm and the fixed electrode generated based on the electric signal, the diaphragm being provided to face the fixed electrode; and a support part that supports the partial region of the diaphragm toward the fixed electrode, the support part including a displacement part that is displaced in a direction in which the diaphragm is displaced in response to a change in pressure inside the housing, and a contacting part contacts the partial region of the diaphragm, wherein a distance between the diaphragm and the fixed electrode in the partial region is less than a distance between the diaphragm and the fixed electrode outside the partial region.

The present invention relates to a device (22) for controlling a loudspeaker in an enclosure, the device (22) comprising: a unit (36) for duplicating a desired dynamic signal (S.sub.dyn) to obtain two identical desired dynamic signals (S.sub.dyn1, S.sub.dyn2), a first processing unit (38) configured to process the first desired dynamic signal (S.sub.dyn1) to obtain a first processed signal (S.sub.dyn1) whereof the frequencies are less than or equal to a predetermined frequency, a second processing unit (40) configured to process the second desired dynamic signal (S.sub.dyn2) to obtain a second processed signal (S.sub.dyn2) whereof the frequencies are strictly greater than the predetermined frequency, and a unit (42) for combining the processed first and second signals (S.sub.dyn1, S.sub.dyn2) to obtain a control signal (S.sub.commande) of the loudspeaker.

A display apparatus may include a rear cover at a rear surface of a display module and a vibration generating module at a rear region of the rear cover. The vibration generating module may be configured to output sound in a forward direction and a lateral direction of the display module.

A headphone apparatus and method of designing the apparatus, the apparatus having selectable EQ mode circuitry configured for listening to different types of audio signals. The EQ mode circuits comprise only passive circuit elements, and each is configured for listening to audio signals having a different characteristic sound profile. The EQ circuits can be switched in and out of the audio signal path to the headphone earpieces, using a switch selector. The selector is configured to operate the plurality of switches such that only a select one of them can be closed at a time.

An audio device with a structure such as an acoustic waveguide, and first and second spaced acoustic transducers that are carried by the structure. A controller is adapted to change the location of the dominant sound source produced by the transducers together in the far field. The device can also be used in a method of facilitating speech communication between two people who speak different languages.

A passive horn integrally formed using thermoplastic vulcanized rubber includes a first outer casing, a second outer casing, an inner casing and an iron piece. The first outer casing includes a sealing ring, a folding ring and a vibrating membrane, and the sealing ring, the folding ring and the vibrating membrane are integrally injection molded into the first outer casing. A groove is disposed in the second outer casing, and the first outer casing is disposed in the groove. The back surface of the vibrating membrane is provided with a casing groove sequentially embedded with the inner casing and the iron piece. Furthermore, a preparation method of a passive horn integrally formed using thermoplastic vulcanized rubber, which, under the condition of integrated injection molding, may improve the yield rate, ensure product quality, save assembly time and labor cost, and improve production efficiency.