11results about How to "Increase sound pressure" patented technology

The invention discloses a lateral transceiving integrated optical fiber ultrasonic endoscope and a preparation method, and belongs to the field of ultrasonic endoscopic imaging. Comprising a double-clad optical fiber, an excitation film, a dielectric mirror and a sensing film. A part of the inner cladding of the optical fiber is etched into a concave spherical surface and coated with an excitation film, excitation light transmitted in the inner cladding is absorbed, and focused ultrasonic waves transmitted in the lateral direction are excited. A part of an inner cladding layer and a fiber core of the optical fiber are etched, and a Fabry-Perot (Fabry-Perot, F-P) cavity is prepared. When an ultrasonic signal laterally transmitted into the ultrasonic endoscope acts on the sensing film of the cavity, the effective refractive index and the F-P cavity length of the sensing film are changed, and the change is demodulated through signal light in the fiber core to complete ultrasonic detection. According to the lateral transmitting-receiving integrated optical fiber ultrasonic endoscope, the inner cladding is etched and coated with the excitation thin film to excite laterally focused ultrasonic waves, an F-P cavity is formed through lateral etching of the optical fiber to achieve lateral ultrasonic detection, and the lateral transmitting-receiving integrated optical fiber ultrasonic endoscope is formed.

The parametric array loudspeaker comprises an ultrasonic transducer array, the ultrasonic transducer array comprises a plurality of sound production channels which are arranged at intervals along a first direction, each sound production channel comprises at least one ultrasonic transducer, each sound production channel is independently controlled, and the ultrasonic transducers are arranged at intervals along the first direction. During operation, part of the sounding channels are controlled to normally send audio signals, and part of the sounding channels are controlled to send low-frequency signals. According to the utility model, sound field movement and low-frequency compensation of the parametric array loudspeaker can be realized.

The utility model discloses a plane loudspeaker with a box body, and relates to the technical field of loudspeakers. The front side of the box body is provided with an opening; the basin frame is erected in the box body and faces the opening direction, and a magnet assembly is arranged on the basin frame; and the vibrating plate sound basin is erected on the front side of the basin frame, and a voice coil matched with the magnet assembly is arranged on one side, close to the basin frame, of the vibrating plate sound basin. A mounting hole is formed in the middle of the frame, and the magnet assembly is clamped in the mounting hole; the magnet assembly comprises U iron, a first magnet, a washer and a second magnet, the U iron is clamped in the mounting hole, and a cavity is formed in the front side of the U iron; the first magnet, the washer and the second magnet are sequentially installed in the cavity from back to front. The peripheral side of the vibration plate sound basin is provided with a dangling edge, and the vibration plate sound basin is erected on the basin stand and the opening side of the box body through the dangling edge in an adhesion mode to form a closed sound cavity with the box body. According to the technical scheme, the sound box has the advantages of being provided with the box body, high in sensitivity, rich in sound details and high in sound quality.

The invention belongs to the technical field of loudspeakers, and particularly relates to a loudspeaker capable of improving sound pressure, which comprises a T iron and a voice coil, and is characterized in that the voice coil sleeves the outer side of the top end of the T iron; the outer magnetic piece is arranged on the T iron in a sleeving manner and is positioned below the voice coil; the magnetic isolation assembly is arranged above the outer magnetic piece and arranged on the outer side of the voice coil in a sleeving mode, and the bottom end of the magnetic isolation assembly is flush with the bottom end of the voice coil; the double inner magnetic pieces are arranged at the top end of the T iron and are positioned in the voice coil; the double-winding piece is arranged at the bottom of the outer side of the voice coil in a sleeving manner; the magnetism isolating assembly, the double inner magnetic pieces and the double rolling pieces are located in the same horizontal plane. Three magnetic circuits of the loudspeaker are formed by the outer magnetic piece arranged on the T-shaped iron and the double inner magnetic pieces arranged in the voice coil, a double-winding voice coil can be formed by the double-winding piece arranged on the outer side of the voice coil, the three magnetic circuits and the double-winding voice coil act together, the sound pressure of the loudspeaker is improved, and therefore the volume and the hearing effect of the loudspeaker are improved.

A dual-drive double-sided sound-emitting loudspeaker, comprising a first vibration system and a first magnetic circuit system assembled into a first sound-emitting body, and a second vibration system and a second magnetic circuit system assembled into a second sound-emitting body; further comprising a common magnetic conductive plate, wherein the first sound-emitting body and the second sound-emitting body are symmetrically arranged with the common magnetic conductive plate as a symmetry plane. Furthermore, the first magnetic circuit system and the second magnetic circuit system are symmetrically arranged relative to the common magnetic conductive plate, the first vibration system is installed on the outside of the first magnetic circuit system, and the second vibration system is installed on the outside of the second magnetic circuit system. The double diaphragms vibrate to emit sound, and the sound pressure of the double diaphragms can be enhanced by guiding the cavity during assembly of the whole machine, thereby improving the sound. It is conducive to the linear design of speaker vibration, and it is easier to design to reduce nonlinear distortion; it is conducive to avoiding the noise caused by polarization anomalies in speaker vibration; it is conducive to avoiding wire break anomalies caused by mechanical fatigue, and improving product yield.

This invention belongs to the field of ultrasonic sensing and microelectromechanical systems (MEMS) packaging technology, specifically relating to a multi-segment acoustic packaging structure and optimization method for a PMUT ultrasonic transducer. The multi-segment acoustic packaging structure for a PMUT ultrasonic transducer includes a base, a PMUT chip, and an acoustic cavity. The acoustic cavity includes a front cavity section, a tapered transition section, a conduit section, and a waterproof and acoustically permeable membrane. A first minimum gap is formed between the radiating surface of the PMUT chip and the bottom surface of the front cavity section; a second minimum gap is formed between the waterproof and acoustically permeable membrane and the outlet end of the conduit section. Furthermore, the acoustic cavity serves as either a transmitter or a receiver. When used as a transmitter, the depth of the front cavity section is greater than that of the front cavity section when used as a receiver, and the inner diameter of the conduit section is smaller than that of the conduit section when used as a receiver. This packaging structure, through optimization of geometric parameters and acoustic characteristics, achieves differentiated performance improvements for the transmitter and receiver, increasing the transmitted sound pressure and directivity, and expanding the bandwidth and receiving angle of the receiver.

The invention provides a digital sound production method and a digital sound production device, and the method comprises the steps: continuously generating a periodic sound production driving signal which has a preset period and a preset amplitude; obtaining a target audio signal, and generating a corresponding number of micro-switch driving signals at different moments based on the positive and negative and amplitude values of the target audio signal at different moments; the corresponding number of micro switches in the micro switch array are controlled to be turned on through the corresponding number of micro switch driving signals at different moments, so that the corresponding number of sound production driving signals pass through the turned-on micro switches and then are superposed, and synthesis and demodulation of target audio signals at different moments are realized. According to the digital sound production method and the digital sound production device provided by the invention, the sound pressure of the target audio signal is improved, and high-sound-pressure sound production is realized.

The present invention relates to the field of loudspeaker technology, and in particular to a differential electromagnetic receiver drive assembly and its assembly tooling and assembly method. During the assembly process of the drive assembly, the gap between the dynamic suction plate and the pole shoe is required to be very high. During the assembly process, the gap must be adjusted and the front and rear sound cavities and sound damping must be configured to adjust the audio characteristics. In this application, a gap plate is prefabricated according to the design requirements of the gap and fixed on the clamp seat. The gap plate is used to assist the assembly of the drive assembly to ensure that the gaps between the left and right poles are uniform and free of debris. A differential electromagnetic receiver drive assembly and its assembly tooling and assembly method are specifically disclosed. By adding a gap adjustment tooling to assist the assembly during the installation of the drive assembly, the dynamic suction plate and the pole shoe in the receiver are arranged in parallel, so that the gaps between the left and right levels are the same and free of debris, and the product requirements are met; the sound pressure of the swing-pivot differential electromagnetic receiver product is improved, the pure sound is improved, the impedance is stable, and the product consistency is stable.

The utility model discloses a high-sound-pressure sound box, which comprises a box body, a control unit, a low-sound module and a plurality of high-sound modules, the control unit is electrically connected with the low-sound module and the high-sound modules, each high-sound module is arranged above the low-sound module, and a first sound pressure cover and a second sound pressure cover are respectively arranged in the high-sound module and the low-sound module. The first sound pressure cover and the second sound pressure cover have the same structure; according to the high-sound-pressure sound box, the low-sound module cooperates with each high-sound module to produce sound, and the first sound pressure cover installed in the first horn of the high-sound module and the second sound pressure cover installed in the second horn of the low-sound module cooperate with each other. Part of sound emitted by the high-pitch loudspeaker and the low-pitch loudspeaker is reflected and compressed between the horn and the sound pressure cover, and the reflected sound cooperates with the original sound, so that the sound pressure of the sound emitted by the high-pitch module and the low-pitch module is improved, and the sound emitted by the sound box is rich in layering sense, is more vivid and flexible, and is wider in transmission range.

A sound output device includes an acquisition unit, an ear speaker, and a sound controller. The acquisition unit acquires data of an information sound providing an operator with information. The ear speaker outputs the information sound such that sound pressure of the information sound at a position of an ear of the operator is higher than sound pressure at positions other than the position of the ear. The sound controller controls the ear speaker to emphasize the information sound more when the information sound indicates a high degree of necessity for the operator to take action against the information sound than when the information sound indicates a low degree of the necessity.

The present invention discloses an ultrasonic transducer. The ultrasonic transducer comprises: a shell, a transducer housing and at least one ultrasonic transmitting unit for transmitting ultrasonic waves, wherein the transducer housing and the ultrasonic transmitting unit are located inside the shell, and the ultrasonic transmitting unit is located on the transducer housing; the inner surface of the transducer housing is an ultrasonic transmitting surface and has the function of reflecting ultrasonic waves, and the inner surface of the transducer housing forms a resonance cavity; the ultrasonic waves emitted by the inner surface of the transducer housing and the reflected waves formed by the reflection of the ultrasonic waves by the inner surface of the transducer housing are focused on the focal area of ​​the ultrasonic transmitting unit. The ultrasonic transducer provided by the present invention realizes resonant focusing and can withstand high hydrostatic pressure, thereby further improving the sound pressure in the focal area.