85results about How to "Improve electro-acoustic conversion efficiency" patented technology

The invention relates to a digital loudspeaker drive method and a device based on quaternary code dynamic mismatch reshaping. The method comprises the steps of (1) conducting input format conversion, (2) conducting multi-bit sigma to delta modulation, (3) conducting thermometer code conversion, (4) conducting dynamic mismatch reshaping processing, (5) conducting channel data combination and mapping coding, (6) controlling metal-oxide-semiconductor field effect transistor (MOSFET) pipe of a full-bridge power amplifier network to conduct opening and closing status switching, and driving a digitalized loudspeaker load to produce sound. The device comprises a sound source (1), a digital format converter (2), a multi-bit sigma to delta modulator (3), a thermometer coder (4), a dynamic mismatch reshaper (5), a channel data combiner (6), a mapping coder (7), a multi-channel digital amplifier (8) and the digitalized loudspeaker load (9). The units are sequentially connected in order. According to the digital loudspeaker drive method and the device based on quaternary code dynamic mismatch reshaping, use efficiency of an amplifier pipe and the load is improved, development periods and hardware implementation cost are saved, and good immunity is provided for frequency response deviation of digital channels.

The invention discloses an electronic display device and an electronic device. The electronic display device comprises a casing, a screen and a vibration device, wherein at least a part of the screenis connected to at least a part of the casing through a flexible connecting device, at least one of the screen and the casing is provided with a receiving groove for fixing the flexible connecting device, the flexible connecting device is elastic, the vibration device is fixed on the screen, and the vibration device is configured to vibrate in response to electrical signals of an external circuitand drive the screen to vibrate and sound. The screen is connected with the casing by the flexible device instead of a fixed connection, and the casing does not vibrate when the screen vibrates, thereby effectively reducing the sound leakage caused by the vibration of the casing. The connection strength of the flexible connecting device to the casing and the screen is improved by the flexible connecting device receiving groove.

The invention discloses an online impedance measuring and dynamic matching system for an ultrasonic transducer, and belongs to the technical field of impedance matching of the ultrasonic transducer. In order to overcome the problems of high matching cost, poor success rate and low electro-acoustic conversion efficiency in the prior art, the online impedance measuring and dynamic matching system for the ultrasonic transducer provided by the invention comprises a signal generator and the ultrasonic transducer; an impedance measuring system, an impedance matching circuit, a single chip microcomputer system and a driving module are disposed between the signal generator and the ultrasonic transducer; the impedance measuring system comprises a current probe, a voltage probe and a computer controlled collection system connected with the current prove and the voltage probe; the computer controlled collection system is connected with the single chip microcomputer system; the single chip microcomputer system is connected with the driving module; and the driving module is connected with the impedance matching circuit. According to the online impedance measuring and dynamic matching system provided by the invention, the impedance measuring and real-time matching can be performed on an ultrasonic transducer in a working state, and thus the electro-acoustic conversion efficiency of the ultrasonic transducer is improved.

The invention belongs to the field of loudspeaker technology and manufacture and relates to a multipurpose bidirectional horn loudspeaker. The loudspeaker comprises a front horn and a rear horn that are driven by a driving unit; the front horn is connected with a front larynx cover and a front larynx plug of the driving unit; the rear part of the front larynx plug is provided with a front chamberthat is connected with a vibration film; the vibration film is connected with a voice coil paper tape; the rear horn is connected with a rear larynx cover and an internal rear larynx plug in the driving unit; the rear part of the rear larynx plug is provided with a rear chamber; the position between the front and the rear larynx plugs, namely, the center of the driving unit, is provided with a magnetic circuit system and a vibration system; and a front radiating horn and a rear radiating horn commonly use one magnetic circuit system and one vibration system. The loudspeaker has the beneficialeffects that the electro-acoustic conversion efficiency of the loudspeaker is improved greatly, the energy-saving and material-saving effect is outstanding, the heating condition of the driving unit is greatly improved, therefore, the damage possibility of the key part voice coil affecting the reliability of the loudspeaker is reduced, the service life of the loudspeaker is prolonged, the using cost is reduced, the usage is convenient and a large amount of electric energy and raw material resources are saved.

The invention relates to an impulse discharge electrode, which comprises a high-voltage electrode (1), a low-voltage electrode (2), an insulated sleeve (3), and a reflector (4). Wherein, said four parts both use coaxial structures; the high-voltage electrode (1) is a round rod, whose outer part is mounted with an insulated sleeve; the high-voltage electrode (1) and the insulated sleeve are connected by screw or fixed together; the outer left section of insulated sleeve is sheathed with a tube low-voltage electrode (2) while the right section is sheathed with a cylinder reflector (4) with central hole; the insulated sleeves have outer screws; the low-voltage electrode (2) and the central hole of cylinder reflector (4) have inner screws; the left end surface of cylinder reflector (4) is a inward concave semi-ellipsoid; the cylinder reflector (4) is connected to the insulated sleeve; the end of high-voltage electrode (1) is at the focus of semi-ellipsoid. The invention has simple structure, better discharge stability and repeated property, with long service life and high electric sound transform efficiency.

The invention relates to a loudspeaker, in particular to a three-dimensional wave coaxial motor-driven loudspeaker. The three-dimensional wave coaxial motor-driven loudspeaker comprises a voice coil set, vibrating diaphragms, a cylinder, a cone support, a locating support and a spiral rubber pipe wire. The three-dimensional coaxial motor-driven loudspeaker is characterized in that the voice coil set is formed by m voice coils in same structure, the m vibrating diaphragms are same in structure, the m vibrating diaphragms and the voice coil set are coaxial and synchronous, and the m vibrating diaphragms are coaxial with the sound basin support; the cylinder is jointly and coaxially formed by a screw, n magnets, m separating sheets or I-shaped sleeves and nuts; the cylinder is respectively fixed on the sound basin support and the locating support, and the sound basin support, the locating support and the cylinder are concentric and coaxial with the vibrating diaphragms; a voice coil set lead is the spiral rubber pipe wire; the n is larger than or equal to three, and the m is larger than or equal to two. The three-dimensional coaxial motor-driven loudspeaker has the advantages of being high in sensitivity, high in fidelity factor, high in electricity-sound conversion efficiency and low in requirement for power amplification. Frequency response fidelity at 20 Hz-20 KHz is guaranteed, and the convention that the loudspeaker is not used in a music hall will be broken.

The invention discloses an agriculture electric agricultural chemical spraying device capable of enabling convenient mixing of agricultural chemicals. The invention relates to a jellyfish driving infrasonic wave acoustic generator which is technically characterized in that an electric driver suspending support is fixedly mounted at a center of a bottom part of a water resistant and a pressure resistant cavity, a heat exchanger is mounted outside the electric driver, a vibrating wire coil is mounted at the middle of a magnetic gap of the electric driver, the vibrating wire coil is adhered to a water resistant vibrating diaphragm and a damper, the water resistant vibrating diaphragm and a water resistant folding ring are connected in a seamless manner and are fixedly mounted on a driver basin rack, the driver basin rack and the water resistant and a pressure resistant cavity are fixedly mounted together, a watertight pressing ring is mounted on an edge of the water resistant folding ring, a waterproof biological film is attached on the water resistant vibrating diaphragm and the water resistant folding ring, and the water resistant vibrating diaphragm and the water resistant folding ring are protected via installation of an anti-filing net in a notch of the watertight pressing ring.

The invention discloses a double-voice-coil loudspeaking assembly. The double-voice-coil loudspeaking assembly comprises two loudspeaking single bodies, each loudspeaking single body comprises a magnetic circuit system, a diaphragm and a voice call, the voice coil is connected with the diaphragm, the voice coil is contained in a magnetic gap of the magnetic circuit system, and openings of the magnetic gaps of the two magnetic circuit systems are arranged in an opposite manner. The invention also provides a loudspeaking apparatus with the double-voice-coil loudspeaking assembly. Based on the above scheme, according to the double-voice-coil loudspeaking assembly and the loudspeaking apparatus, high sound pressure level can be provided, and the loudspeaking loudness can be increased.

The audio equipment comprises a loudspeaker, two input terminals and a control module, the loudspeaker comprises a magnetic circuit system and a vibration system, one end of a voice coil of the vibration system is connected with a vibrating diaphragm, the other end of the voice coil of the vibration system is inserted into a magnetic gap of the magnetic circuit system, the voice coil comprises two voice coil wires, and the two voice coil wires are arranged in the magnetic circuit system. The two voice coil wires are respectively provided with a first coil section and a second coil section, the first coil sections and the second coil sections are sequentially arranged in the axial direction of the magnetic gap, the current direction in the first coil sections is opposite to the current direction in the second coil sections, and the two input terminals are electrically connected with the two voice coil wires respectively and used for inputting current to the voice coil. The control module is electrically connected with the two input terminals, and the control module is used for controlling the two input terminals to switch the connection state and/or the current magnitude of the two voice coil wires. The invention aims to provide the audio equipment capable of eliminating the reverse electromotive force of the voice coil, and the audio equipment can effectively reduce distortion, improve loudness and improve subjective audition quality.

The invention relates to an MEMS ultrasonic transducer technology, and in particular to an MEMS piezoelectric ultrasonic transducer with a horn structure. The transducer comprises an MEMS piezoelectric ultrasonic transducer and a horn-shaped silicon structure, wherein the horn-shaped silicon structure is bonded on the upper surface or the lower surface of the MEMS piezoelectric ultrasonic transducer. A cavity in the horn-shaped silicon structure forms at least one sound wave guide pipe. Each sound wave guide pipe comprises at least two steps. Each step comprises a step sound pipe. The sectional area of each step sound pipe is gradually increased to form a horn-shaped cavity. Each horn-shaped cavity can amplify sound waves generated by the MEMS piezoelectric ultrasonic transducer. In addition, sound waves generated by the back of the MEMS piezoelectric ultrasonic transducer can be conducted to the top of the MEMS piezoelectric ultrasonic transducer and are overlapped with sound waves generated by the top of the MEMS piezoelectric ultrasonic transducer for transmission, so that the intensity of the sound waves generated by the ultrasonic transducer is further improved. According to the device, the intensity of the sound waves generated by the MEMS ultrasonic transducer can be enhanced, and the energy conversion efficiency of the MEMS piezoelectric ultrasonic transducer is improved.

The invention relates to a single-cavity sandwich-type automobile subwoofer. The subwoofer comprises a bass box body, woofers and bass radiator groups, wherein the woofers and the bass radiator groupsare installed in the bass box body. There is at least one woofer and the woofer is installed on the box wall of the bass box body. There is at least one bass radiator group and each group comprises two bass radiator units. The two bass radiator units are arranged correspondingly in front and back portions and are installed on the box wall of the bass box body. The installation plane of the two bass radiator units is coplanar, parallel, vertical or tilted to the installation plane of the woofer. In the invention, through the interaction of the woofer and the bass radiator group, electroacoustic conversion is completed in a single bass box body so that the size of the subwoofer is reduced by 90%; and the weight is light, the shocking, heavy, elastic and pure bass can be generated so that problems that the subwoofer is large and is not easy to install are solved. The subwoofer of the invention is suitable for internal installation of front installation, rear installation and the like ofan automobile, wherein the internal installation has requirements of the small size, thin installation and good bass.

The invention discloses an ultrasonic transducer which comprises a front cover plate, a back cover plate and a prestressed bolt. A piezoelectric ceramic piece and a conductive pole piece are arrangedbetween the front cover plate and the back cover plate; a first inner screw hole is formed in the back end surface of the front cover plate; through holes are formed in the back cover plate, the piezoelectric ceramic piece and the conductive pole piece; a screw rod of the prestressed bolt penetrates through the through holes so as to be fixedly connected with the first inner screw hole of the front cover plate; the front cover plate outwards extend to form a flange structure along the radial direction from the periphery of the front cover plate; a circumferential inner wall surface is arrangedon the flange structure; a flange inner screw thread is arranged on the circumferential inner wall surface; and a spring washer is arranged between the back end surface of the back cover plate and ascrew cap of the prestressed bolt. Compared with an existing design, the ultrasonic transducer has the advantages of simple structure, easiness in implementation, low implementation cost, uniformity in internal stress, high electro-acoustic conversion efficiency, long service life, simple structure, flexibility, good stability, less outward transmission vibration, high performance stability and the like which are not possessed by existing similar products.

The invention provides a double-stimulus two-dimensional longitudinal coupled oscillation sandwich type piezoelectric ultrasonic transducer. The double-stimulus two-dimensional longitudinal coupled oscillation sandwich type piezoelectric ultrasonic transducer comprises a piezoelectric ceramic crystal stack, an outer metal block and a share center coupled metal block, wherein the piezoelectric ceramic crystal stack, the outer metal block and the share center coupled metal block are sequentially and coaxially connected, and a cross-shaped structure is formed by the piezoelectric ceramic crystalstack, the outer metal block and the share center coupled metal block in a horizontal direction and a vertical direction together. According to the double-stimulus two-dimensional longitudinal coupledoscillation sandwich type piezoelectric ultrasonic transducer provided by the invention, defects of lower power capacity, unidirectional ultrasonic irradiation and smaller ultrasonic irradiation areaexisting in a longitudinal oscillation sandwich type piezoelectric ultrasonic transducer in the prior art can be solved to a large extent, and meanwhile, the double-stimulus two-dimensional longitudinal coupled oscillation sandwich type piezoelectric ultrasonic transducer has the advantages of double frequency, two-dimensional four-directional ultrasonic irradiation and the like.

The invention belongs to the technical field of oil production, and particularly relates to an ultrasonic variable-frequency blockage removing, oil outlet increasing and injection increasing device. The ultrasonic variable-frequency blockage removing, oil outlet increasing and injection increasing device comprises a cable, a cable connecting body, a protection cylinder, piezoelectric ceramic and a pressure balance rubber cylinder and further comprises a sealing piston. The cable is connected to the upper side of the cable connecting body through a cable connector assembly. The protection cylinder is fixedly connected to the outer side of the lower end of the cable connecting body. The piezoelectric ceramic is pre-tightened and fixed to the inner side of the protection cylinder through a gland, and copper skin is attached to the inner wall of the piezoelectric ceramic and connected with the cable through a wire and the cable connector assembly, so that power supply is achieved. A wire passing pipe is mounted in the center of the lower end of the cable connector body. The wire penetrates through the center of the wire passing pipe and a wire passing hole in the pipe wall of the wire passing pipe. The sealing piston is mounted in a piston sleeve and can slide in the piston sleeve, and the piston sleeve is connected to the lower end of the protection cylinder through a middle connecting body. The pressure balance rubber cylinder is of a cylindrical structure with the two ends being open.

The invention relates to an ultrasonic wave radiator, comprising radiating rod with transducer at one end or two ends. Several ring grooves are set on the radiating rod. Said ring grooves comprise two faced ring radiating faces. When the rod generates vibration under the excitation of transducer these radiating faces can radiate ultrasonic wave. Because the radiating rod has many radiating faces the total radiating area of transducer is large and conversion efficiency from electricity to sound is high. Because the whole length direction of radiator can radiate ultrasonic wave treatment time can be shortened and working efficiency can be improved. By setting dimension and position of two faced radiating faces on said ring rod reasonably vibrations of two radiating faces are opposite phase in basic so that superposition sound field formed by ultrasonic wave radiated by two radiated faces is strengthened and the whole radiating effect is good.

The invention discloses a low-frequency broadband efficient array forming structure based on a bent disc transducer, which mainly comprises a transmitting array. The transmitting array comprises a plurality of groups of transducer units, the transmitting array is formed by arranging a plurality of groups of same transducer units at equal intervals in the horizontal direction, and the postures of the transducer units in the transmitting array are consistent; the acoustic center distance between the transducer units is not greater than the half wavelength of the transducer units at a resonant frequency point, and therefore the near-field mutual radiation influence on each group of transducer units is kept consistent; each transducer unit is formed by arranging one or more bent disc transducers in the axial direction. Radiation impedance of the bent disc transducers can be changed by arraying the bent disc transducers according to a specific arraying mode, and therefore resonant frequencyof a transmitting array is reduced; working bandwidth is expanded, electro-acoustic efficiency is improved; the transmitting array is enabled to meet development requirements of a future maneuveringdetection system.

The invention relates to a high power density piezoelectric transducer for an ultrasonic surgical instrument. The existing product has small ultrasonic power. The high power density piezoelectric transducer comprises a plurality of groups of piezoelectric transduction units, wherein a solid trumpet-shaped deformation transformation block is arranged between every two adjacent piezoelectric transduction units, and insulation layers are arranged between the piezoelectric transduction units and the deformation transformation blocks. Each piezoelectric transduction unit comprises a plurality of disc piezoelectric sheets which are coaxially arranged, metal electrodes are respectively arranged on the surfaces of the disc piezoelectric sheets, and two cone frustum-shaped metal caps are arranged between every two adjacent piezoelectric sheets. All the piezoelectric transduction units have the same height, the diameters of the piezoelectric sheets of the plurality of piezoelectric transduction units are sequentially reduced, and all the deformation transformation blocks have the same height. The center distance between two adjacent piezoelectric transduction units satisfies the dispersion equation. With the high power density piezoelectric transducer, the electroacoustic conversion efficiency is effectively increased, the ultrasonic irradiation directivity is improved, and the ultrasonic energy of a local area is improved within a limited space.