219results about How to "Improve low frequency performance" patented technology

A system and method for achieving extended low-frequency response and increased low-frequency sound pressure output capability in a loudspeaker system is provided. The system and method comprise mounting a low-frequency driver in a ported box, tuning the ported box to a sufficiently low frequency so as to result in a frequency response that can be modeled substantially as a second-order response, and equalizing the response of said driver-box combination with a second-order biquadratic filter function to achieve the desired frequency response characteristic.

The invention relates to a ceiling type flat-panel sound box comprising a sound board, a sound sensor and a sound effect chamber; the sound sensor is arranged on the back surface of the sound plate; the sound sensor is connected with a driver in the sound effect chamber; the sound effect chamber is arranged on the back surface of the sound board; and the sound board is mounted on a ceiling. The surface of the sound board can be cut in the field according to the actual installing requirement. The sound box can be completely fused with the common ceiling; a sound box body is formed by artfully using a large top space formed after the ceiling is suspended, so that the low-frequency performance is greatly enhanced, and the sound box is convenient and easy to install and maintain and is very suitable for public spaces.

A speaker system comprised of more than one speaker, which utilizes the known characteristics and location of each speaker to enhance low frequency (low (bass) frequency) performance of the system.

The invention discloses a loudspeaker module, and relates to the technical field of electroacoustic products. The loudspeaker module is arranged in an electronic terminal, and comprises a shell, a vibrating system and a magnetic circuit system are contained in the shell, the magnetic circuit system comprises a basin stand fixed to the shell, a magnet and a washer are fixed in the basin stand in sequence, and rear sound output holes are formed in the positions, corresponding to the side walls of the basin stand, of the shell, and communicated with an inner cavity of the module and an inner cavity of the electronic terminal. Chamfered planes are arranged at the upper ends of the side walls, corresponding to the rear sound output holes, of the basin stand, and arranged on the sides, close to the rear sound output holes, of the side walls of the basin stand. According to the loudspeaker module, the technical problem that a loudspeaker module in the prior art is large in size and low in frequency, and distortion occurs easily is solved, the loudspeaker module guarantees acoustic performance, meanwhile, the size is reduced to the minimum, the need for the light, thin and small electronic terminal is met, stability is high, and the service life is long.

The invention discloses a graphene aerogel and a preparation method and an application thereof, wherein the aerogel is prepared from the following method: (1) pre-reduction treatment: adding a reducing agent to a graphene oxide solution, mixing, carrying out ultrasonic dispersion, and carrying out pre-reduction treatment, to obtain a semi-reduction graphene hydrogel; (2) final reduction treatment:adding a reducing agent, carrying out ultrasonic treatment, and then carrying out final reduction treatment, to obtain a graphene hydrogel; and (3) acid / alkali soaking: placing the graphene hydrogelin an acid or alkali aqueous solution, soaking, washing the hydrogel to be neutral, sucking out the excess liquid, and carrying out freeze drying, to obtain the graphene aerogel. The graphene aerogelis applied to electromagnetic wave absorption materials. The graphene aerogel obtained by the method has small density and good integrality, and has a certain mechanical strength and resillency; the prepared wave absorbing material has good electromagnetic wave absorption performance, and the wave absorbing performance can be adjusted; and the method has the advantages of simple process, short production cycle, low cost and good benefits, and is suitable for industrialized production.

The invention provides a thin broadband sound-absorbing structure. The structure comprises a sound-absorbing material, a support and at least two layers of mechanical impedance plates, wherein the sound-absorbing material is installed on the inner side of one end of the support, a supporting plate is arranged on the inner wall of the other end of the support, each of the mechanical impedance plates consists of a back plate and sticky elastic rings at two ends of the back plate, adjacent back plates are not in contact, sticky elastic rings are stuck to the supporting plate through an adhesive, the sticky elastic rings, the support inner wall and the back plates are attached tightly, a hollow is formed among the sound-absorbing material and the mechanical impedance plates, and the back plate on the outermost side is recessed towards the support end face by certain distance. Mechanical impedance is coupled to a traditional sound-absorbing material and a cavity resonance absorption mechanism, a novel thin broadband sound-absorbing mechanism is formed, the structure thickness is not increased basically based on the acoustic performance, the middle / high-frequency sound absorption performance is good, the low-frequency sound absorption effect is improved greatly and the sound-absorbing structure of which the thickness is thin and the sound-absorbing frequency band is wide is produced.

The invention discloses a piezoelectric speaker based on a piezoelectric cantilever beam, belonging to the technical filed of piezoelectricity. The piezoelectric speaker is structured by bonding an upper layer piezoelectric ceramic piece and a lower layer piezoelectric ceramic piece of opposite polarization directions at both sides of a middle layer fiber sheet, thereby forming a piezoelectric cantilever beam; one end of the piezoelectric cantilever beam is fixed with an external frame so as to form a fixed end from which electrodes are led out; the movable end of the piezoelectric cantilever beam is connected with a vibration sheet by a link block with a damp function; and the vibration sheet is bonded to the external frame through a vibration film. The vibration sheet can serve as the main medium for driving air around the speaker and also the counter weight of the speaker, can reduce the first-order resonance frequency of the speaker effectively, and improve the effect of low pitch replay. The piezoelectric speaker provided by the invention has the characteristics of low resonance frequency, simple vibration mode and large vibration range and the like, and has the advantages of good low pitch performance, stable sound pressure output and high sound output and the like compared with a conventional surface mount type piezoelectric speaker.

The invention belongs to a material preparation technology, and relates to nickel zinc ferrite powder and a preparation method thereof. The expression of the nickel zinc ferrite powder is NixZn1-xFe2O4, wherein x is equal to 0.5-0.7. The preparation method comprises the following steps of: taking analytically pure iron nitrate, zinc nitrate and nickel nitrate according to a stoichiometric ratio of NixZn1-xFe2O4, simultaneously dissolving in de-ionized water, adding a certain amount of citric acid, and uniformly dispersing by using equipment such as a magnetic stirrer to obtain brown yellow mixed solution; heating the mixed solution under a certain temperature condition until a solvent is evaporated to dryness to form a brown ash-shaped material; filling the brown ash-shaped material in a muffle furnace and sintering under a certain temperature condition to obtain black sinter; and finally crushing the black sinter in a ball mill or other grinding equipment to certain particle size and sieving. The preparation process is simple and is easy to realize; and the prepared nickel zinc ferrite powder has better magnetic permeability and lower dielectric constant at the frequency band of 2GHz-4GHz and has lower density.

The invention provides a loudspeaker box comprising a main cone frame, a first upper cover covered on a top end of the main cone frame and enclosed to form an accommodation space together with the main cone frame, and a sound production monomer accommodated in the accommodation space, wherein the sound production monomer and the first upper cover are enclosed to form a front cavity together, the sound production monomer and the main cone frame are enclosed to form a back cavity together, the loudspeaker box further comprises an extension part extending from the main cone frame toward a direction away from the accommodation space, a trunk bulkhead extending from the top end toward the bottom end of the main cone frame and a ventilating isolation part; a first sound absorption cavity filled with a sound production material is arranged in the extension part; the trunk bulkhead is located in the back cavity and is enclosed to form a second sound absorption cavity for accommodating the sound production material together with the main cone frame; the first sound absorption cavity communicates with the second sound absorption cavity, and the second sound absorption cavity communicates with the back cavity; and the ventilating isolation part is covered on one end of the second sound absorption cavity away from the first upper cover so as to prevent the sound production material from entering the back cavity. Compared with the prior art, the loudspeaker provided by the invention has the advantages of simple structure, and good low audio performance, and especially low frequency performance.

The invention provides mobile terminal equipment, which comprises an equipment main body, a loudspeaker and a volume variable sound cavity. The loudspeaker is fixedly arranged in the volume variable sound cavity and is electrically connected with the equipment main body; and the volume variable sound cavity is fixedly arranged on the equipment main body. The loudspeaker is arranged in the volume variable sound cavity, and the volume of the volume variable sound cavity can be enlarged only by changing the volume of the volume variable sound cavity so as to easily enlarge the volume of the sound cavity in the mobile terminal equipment, improve the low frequency effect of sound and improve the sound quality of the mobile terminal equipment.

The invention provides a loudspeaker cabinet. The loudspeaker cabinet includes a bottom cover, a top cover, a side plate, a sounding monomer, a cyclic convex wall and a ventilating separator, whereinthe side plate connects the bottom cover and the top cover, so as to form accommodation space through enclosure, together with the bottom cover and the top cover; a front cavity is formed through enclosure of the sounding monomer, the top cover and the side plate together; a back cavity is formed through enclosure of the sounding monomer, the bottom cover and the slide plate together; the convex wall is extended to the direction, far away from the outer wall of the side plate, from the inner wall of the side plate in a convex manner; the ventilating separator is fixedly supported at one side,close to the top cover, of the convex wall, and separates the back cavity into a first back cavity and a second back cavity, together with the convex wall, and the first back cavity and the second back cavity are mutually communicated in air; the sounding monomer is arranged in the first back cavity; acoustic-absorbing particles are filled in the second back cavity; and the ventilating separator packages the acoustic-absorbing particles in the second back cavity. Compared with the related technologies, the loudspeaker cabinet has better low frequency acoustic performance.

The invention belongs to the technical field of loudspeakers, and particularly relates to a miniature loudspeaker module structure with an adaptive pressure balancing function. The module structure comprises a body of a module. A loudspeaker or sounding component, a front sound cavity and a rear sound cavity are arranged in the body, sounding holes are arranged on a front cavity wall, which corresponds to a vibrating diaphragm of the loudspeaker or sounding component, of the front sound cavity, and a foam or dustproof screen is arranged between the front cavity wall and the loudspeaker or sounding component. An opening is arranged on a wall of the rear sound cavity, a hollow pipeline used as a leakage pipeline of the loudspeaker module is led out at the opening, the aperture of the hollow pipeline is identical to that of the opening, and the hollow pipeline is used as an air pressure balancing channel; the hollow pipeline and the opening are sealed with each other without a gap; and a coefficient of the proportion of the sectional area of the hollow pipeline to the length of the hollow pipeline is not larger than 0.01. The miniature loudspeaker module structure has the advantages that problems that internal air pressure and the external air pressure are unbalanced due to deficiency of leakage holes of an existing loudspeaker module and an individual loudspeaker is damaged are solved owing to the design of the leakage pipeline of the loudspeaker module, low-frequency effects of the small closed sound cavities of the loudspeaker module are further improved, and the sound quality of the loudspeaker module is optimized.

The invention discloses a loudspeaker box comprising a lower cover, an upper cover and a sound generating monomer. The sound generating monomer and the upper cover form a front cavity through enclosing. The sound generating monomer, the lower cover and the upper cover form a rear cavity together through enclosing. The loudspeaker box also comprises a ventilating isolation component and clamp walls. The ventilating isolation component is fixedly clamped between the clamp walls, and the ventilating isolation component and the clamp walls divide the rear cavity into a first rear cavity and a second rear cavity which are mutually communicated together. The sound generating monomer is arranged in the first rear cavity. The second rear cavity is filled with sound absorbing particles. The ventilating isolation component packages the sound absorbing particles in the second rear cavity. The ventilating isolation component comprises a framework, screen cloth which is combined on the framework and elastomers which are arranged at the periphery of the framework. The elastomers are inserted in the clamp walls. The upper cover, the lower cover and the clamp walls extrude the elastomers to form sealing. Compared with the loudspeaker boxes in the prior art, the loudspeaker box has better low frequency acoustic performance and great sealing performance.

A water resistant speaker having a water-impermeable spider and an acoustic chamber in air flow communication with the underside of the spider via vents in a spider support and vents in a bottom panel of a basket of the speaker. The acoustic chamber is attached and sealed to the bottom of the basket and is watertight. The acoustic chamber may have a passive radiator. The combination of a water impermeable spider and a water impermeable diaphragm, adjacently attached and sealed to the former, assist in preventing water from reaching the magnet assembly and voice coil. A water impermeable dust cap is attached and sealed to the diaphragm to prevent water from entering around the former. A vent in the pole piece, leading to the acoustic chamber, reduces drag on motion of the former, dust cap, and diaphragm.

The invention discloses a linear vibration motor, and relates to the technical field of miniature motors. The linear vibration motor comprises a shell, a stator, a vibrator and elastic support elements, wherein the elastic support elements are located at two ends of the vibrator and provide elastic restoring force; each elastic support element comprises two elastic arms; connection parts are arranged at two ends of the same side of each elastic arm respectively; two connection parts at one end of every two elastic arms are combined with each other; two elastic arms extend towards the corresponding directions of respective connection parts to form a transverse crossover structure in the transverse direction respectively; and two connection parts at the other ends of every two elastic arms are combined with the vibration and the shell respectively. A vibration space, occupied by the elastic support elements in the linear vibration motor, of the vibrator is relatively small; and an enough space is left for increase of the weight and the volume of a vibrator mass block, so that the resonant frequency of the vibration motor can be effectively reduced; the low-frequency performance of the vibration motor is improved; and the overall performance of the vibration motor is relatively high.

A mobile terminal is disclosed. The mobile terminal includes a metal housing with an accommodation space, the metal shell including a metal housing having a metal cover, a metal ring disposed outside of the metal cover, and a metal rear housing; an antenna module received in the accommodation space. The antenna module includes a main board with a grounding terminal, the main board including a switching circuit connected with the grounding end of the main board electrically and an LDS antenna controlled by the switching circuit. The main board is connected with the metal cover and the metal ring electrically, the metal cover and the metal ring is coupled with the LDS antenna.

The invention discloses a zeolite particle. The zeolite particle comprises a plurality of zeolite particle bodies and auxiliaries, and the auxiliaries are used to bond the plurality of zeolite particle bodies together, and the particle diameters of the zeolite particles are in a range from 10 (mu)m to 100 (mu)m. The invention also provides the production method of the zeolite particle. Compared with the prior art, the zeolite particle produced by adopting the production method of the zeolite particle is advantageous in that an effect of lowering low frequency is more obvious, and the low frequency performance of the loudspeaker adopting the zeolite particle is better.

The invention discloses a broadband, high-gain and double-slot Vivaldi antenna, which comprises a dielectric plate, a double-slot tapered slot line, edge waves and a feed element, wherein one surface of the dielectric plate is provided with a metal layer as the upper surface; the double-slot tapered slot line is arranged at the upper surface of the dielectric plate and is in an exponential gradient trumpet-shaped opening; the edge waves are arranged on the upper surface of the dielectric plate; and the feed element is arranged on the lower surface of the dielectric plate and is used for feeding the tapered slot line. By the technical scheme disclosed by the invention, the radiation gain of the Vivaldi antenna within a complete working band can be improved.

A speaker includes a vibration system including a vibrating diaphragm and a flat voice coil for driving the vibrating diaphragm; a magnetic circuit system including a first magnet group, a second magnet group and a third magnet group, lined up in turn along the vibration direction of the vibration system; and a housing for accommodating the vibrational system and the magnetic circuit system. The first magnet group includes a first magnet and the second magnet with opposite magnetic poles thereof faced each other. The second magnet group includes a third magnet and a fourth magnet with N-pole of the third magnet close to S-pole of the fourth magnet. The third magnet group includes a fifth magnet and a sixth magnet with opposite magnetic poles thereof faced each other.

The invention discloses a loudspeaker assembly, a loudspeaker box and a mobile terminal. The loudspeaker assembly includes a loudspeaker unit, an assistant loudspeaker unit, and a sound chamber unit, wherein the loudspeaker unit and the assistant loudspeaker unit share a rear chamber provided by the sound chamber unit. The low-frequency loudness of the sound played by the loudspeaker unit is enhanced by the simultaneous reverse-direction vibration of the diaphragm of the loudspeaker unit and the diaphragm of the assistant loudspeaker unit. The low-frequency loudness of the sound played by the loudspeaker unit is reduced by the simultaneous same-direction vibration of the diaphragm of the loudspeaker unit and the diaphragm of the assistant loudspeaker unit. Compared with the prior art, the loudspeaker assembly increases the low-frequency loudness of the audio output by the loudspeaker, and can greatly reduce the low-frequency loudness in a specific application scene so as to be suitable for high-frequency output. The loudspeaker assembly is particularly suitable for highly integrated or smaller and smaller mobile terminals, which helps to reduce the volume of the mobile terminal while enhancing the audio quality.

The invention provides an explosion-proof broadband wave absorption composite material and a preparation method thereof, and belongs to the technical field of multifunctional materials. The preparation method of the explosion-proof broadband wave absorption composite material comprises the following steps: preparing explosion-proof skin by utilizing quartz fiber and unsaturated resin, preparing anelectrical loss wave absorption piece, preparing a magnetic loss wave absorption piece, preparing a broadband interlayer wave absorption material, and sequentially adhering the broadband interlayer wave absorption material and the explosion-proof skin to a reflecting base plate. The explosion-proof broadband wave absorption composite material prepared by the invention is of a laminated structure,and comprises the reflecting base plate, the broadband interlayer wave absorption material and the explosion-proof skin which are in contact in sequence. According to the preparation method providedby the invention, the technical obstacle that a wave absorption material and an explosion-proof material are difficult in combination is overcome, and the preparation method is simple and is easy in industrial implementation; the prepared explosion-proof broadband wave absorption composite material simultaneously has an explosion-proof function and a broadband wave absorption function and has thecharacteristics of good low-frequency performance, broad absorption band, low surface density and excellent environment performance, the explosion-proof function of a product is solved, and the broadband wave absorption function is also integrated.

The invention discloses a display device built-in passive sound box and a displayer, and relates to a sound box device. The display device built-in passive sound box can reduce the volume of the sound box and improve low-frequency effect. A miniature enclosed loudspeaker is characterized by comprising a sound box, a loudspeaker single unit, a first passive radiation part and a second passive radiation part, wherein the loudspeaker single unit is arranged in the sound box, and a diaphragm of the loudspeaker single unit is positioned on a first surface of the sound box; the first passive radiation part is arranged on the first surface; the second passive radiation part is arranged on the second surface of the sound box; the second surface is opposite to the first surface; and the first passive radiation part and the second passive radiation part can buffer sound pressure generated by loudspeaker parts in the sound box. The invention discloses the displayer provided with the built-in passive sound box. The display device built-in passive sound box and the displayer are suitable for the field of sound box manufacture.

The invention discloses an antenna used for a terminal and the terminal provided with the antenna. The antenna comprises a main metal frame, a first corner metal frame and a second corner metal frame, wherein the main metal frame is a main radiation body of the antenna; one end of the main metal frame is connected to a mainboard of the terminal by a feeder end; the first corner metal frame is arranged on one side, close to the feeder end, of the main metal frame; a first gap is defined between one end of the first corner metal frame and the main metal frame; the other end of the first corner metal frame is connected to the mainboard; the second corner metal frame is arranged on one side, far away from the feeder end, of the main metal frame; a second gap is defined between one end of the second corner metal frame and the main metal frame; and a third gap is defined between the other end of the second corner metal frame and the mainboard. According to the antenna used for the terminal, the third gap is arranged on the second corner metal frame to disconnect the second corner metal frame and the mainboard, so that an adverse effect of the second corner metal frame on the main metal frame can be effectively improved; the efficiency of the main metal frame is increased; and the low-frequency performance of the main metal frame is enhanced.

A speaker is disclosed in the present disclosure. The speaker includes a vibration system including a vibrating diaphragm and a flat voice coil for driving the vibrating diaphragm; a magnetic circuit system including two separated permanent magnets with opposite magnetic poles thereof facing each other; a magnetic gap formed between the permanent magnets for partially receiving the flat voice coil; and a housing for accommodating the vibrational system and the magnetic circuit system. Magnetic conductive plates are attached to external surfaces of the permanent magnets. The housing includes a through-hole with a shape matched with the magnetic conductive plates, a wall of the housing has support steps located in the through-hole, and the magnetic conductive plates are placed in the through-hole and are fixed on the support steps.

The invention provides an antenna structure, including more than one antenna spring, an antenna feed spring, and antenna lines positioned at two sides of a main board. The antenna feed spring and each antenna spring are fixed on the main board and are contacted with the antenna lines. The antenna feed spring and at least one antenna spring are positioned in antenna clearance zones at the two sides of the main board respectively and are electrically connected with a main board line by through holes of the main board, so as to connect the antenna lines positioned at the two sides of the main board.

The invention provides a system and method for improving the voice quality of a mobile terminal in a receiver mode. The system for improving the voice quality of the mobile terminal in the receiver mode comprises a first signal channel and a second signal channel which are arranged in parallel; the first signal channel comprises a first power amplifier and a receiver which are electrically connected; the second signal channel comprises a second power amplifier and a vibration motor which are electrically connected; the receiver and the vibration motor simultaneously receive and play voice signals; the first power amplifier and the second power amplifier are respectively used for adjusting the gains of the voice signals output to the receiver and the vibration motor. According to the system and the method provided by the invention, when the receiver sounds, the vibration motor vibrates synchronously according to the voice signals and drives the mobile phone to vibrate and sound; the voice generated by the vibration of the vibration motor and the voice generated by the receiver are combined; the better voice quality is obtained; and the better low frequency, the better high frequency or the higher loudness is obtained.