42results about How to "High vocal efficiency" patented technology

A thermal sounding device comprises a substrate, a thermal sounding element arranged on the surface of the substrate, and a heating device used for providing energy to the thermal sounding element to enable the thermal sounding element to produce heat, wherein the thermal sounding element comprises a composite film, the composite film comprises at least a first carbon nano tube layer and at least one graphene film with the first carbon nano tube layer and the graphene film being stacked over each other, the substrate comprises a carbon nano tube composite structure, and the carbon nano tube composite structure comprises a second carbon nano tube layer and an insulation material layer coated on the surface of the second carbon nano tube layer. The invention further provides an electronic device using the thermal sounding device.

The invention relates to a power amplification circuit for a thermally induced sound-producing device, which comprises a peak holding circuit, an addition and subtraction circuit and a power amplifier. The peak holding circuit is used for receiving an audio electrical signal and outputting a peak holding signal; the addition and subtraction circuit is used for receiving the audio electrical signal and the peak holding signal, comparing the audio electrical signal and the peak holding signal, carrying out calculation and then outputting a modulation signal; and the power amplifier is used for receiving the modulation signal and amplifying and outputting the modulation signal. The invention also relates to the peak holding circuit and the thermally induced sound-producing device.

The invention relates to a klaxon control method. A klaxon primary sound pressure level stabilization control method comprises that: firstly, a power supply voltage is detected by utilizing an analogue-to-digital conversion function of a singlechip; secondly, the singlechip determines the duty ratio of a current klaxon drive signal according to corresponding relationships between detected power supply voltage values and the duty ratios of klaxon drive signals, and adopts a natural frequency value of a klaxon stored in the singlechip or a nonvolatile data memory as the frequency of the current klaxon drive signal; and finally, the singlechip outputs the klaxon drive signal which is subjected to power amplification to drive the klaxon to work and is a square signal. The invention provides the klaxon primary sound pressure level stabilization control method through which a sound pressure level can be automatically stabilized, and a klaxon intelligent control method with the advantages of environmentally-friendly sound-production function and capability of automatically adjusting drive frequency in real time and automatically stabilizing the sound pressure level.

The invention relates to an intelligent control method and an intelligent control device for an electric horn. The dynamic frequency stabilization control method for the electric horn comprises the following steps of: driving the electric horn to work after square wave signals output by a singlechip are subjected to power amplification, then adjusting the frequency of the square wave signals in amode of gradual increasing or gradual reducing with adjusting quantity of 0.005 to 5.0Hz, and meanwhile, detecting the vibration strength of a vibrating diaphragm of the electric horn through the singlechip so as to find the natural vibration frequency of the electric horn. The control device of the electric horn comprises a bowl-shaped bottom shell, a static iron core, a dynamic iron core, a coil, the vibrating diaphragm and a control circuit, wherein the control circuit comprises a micro processing module, a power supply module, a coil driving module, a key input module and a vibrating diaphragm vibration signal detecting module. The invention provides the intelligent control method and the intelligent control device for the electric horn, which can automatically adjust the driving frequency in real time and automatically stabilize the sound pressure level, wherein the device has environment-friendly sound production function and is convenient to connect keys.

A suspended nanotube film (or films) producing sound by means of the thermoacoustic (TA) effect is encapsulated between two plates, at least one of which vibrates, to enhance sound generation efficiency and protect the film. To avoid the oxidation of carbon nanotubes at elevated temperatures and reduce the thermal inertia of surrounding medium the enclosure is filled with inert gas (preferably with high heat capacity ratio, γ=C_p/C_v, and low heat capacity, C_p). To generate sound directly as the first harmonic of applied audio signal without use of an energy consuming dc biasing, an audio signal modulated carrier frequency at much higher frequency is used to provide power input. Various other inventive means are described to provide enhanced projected sound intensity, increased projector efficiency, and lengthened projector life, like the use of infrared reflecting coatings and particles on the projector plates, non-parallel sheet alignment in sheet stacks, and cooling means on one projector side.

The embodiment of the invention discloses a loudspeaker, a loudspeaker module and electronic equipment. The loudspeaker comprises a support, a first vibrating diaphragm, a first piezoelectric plate and a moving-coil loudspeaker core. The periphery of the first vibrating diaphragm is fixed to the support, and the first piezoelectric plate is fixed to the middle of the first vibrating diaphragm. The moving-coil loudspeaker inner core is fixed on the support, the moving-coil loudspeaker inner core and the first vibrating diaphragm are arranged in a spaced mode, the moving-coil loudspeaker inner core comprises a second vibrating diaphragm, the second vibrating diaphragm faces the first vibrating diaphragm, the second vibrating diaphragm, the support and the first vibrating diaphragm jointly define a front cavity, the support is provided with a sound outlet hole, and the sound outlet hole is communicated with the front cavity and the external space of the loudspeaker. The first vibrating diaphragm and the second vibrating diaphragm of the loudspeaker are oppositely arranged and share the front cavity, so that the medium-high frequency response of the loudspeaker is complemented, and the overall loudness of the loudspeaker is improved.

The invention discloses a sonic ash remover capable of realizing airflow cutting based on cam movement. The sonic ash remover comprises a mechanical case and an air chamber, wherein the air chamber is a sound production device of the ash remover; a loudspeaker is connected to one side of an air outlet outside the air chamber, and high-pressure air from an air compressor is connected to one side of an air inlet; the air inlet is communicated with the air outlet through an air passage; a cam is arranged in the mechanical case, and is driven by a driving device to rotate; a guide wheel tangential to the outer circle of the cam is further arranged in the mechanical case, and is connected with a connecting rod through an elastic device; the other end of the connecting rod is connected with a covering piece which reciprocally moves up and down under the action of the connecting rod; high-pressure airflow in the air passage flows out from the outlet side of the air chamber at high speed in a pulsing manner to form sonic waves.

A thermoacoustic device comprises a substrate, and the thermoacoustic device further comprises at least one thermogenic device and a plurality of thermoacoustic elements, wherein the plurality of thermoacoustic elements are separately arranged on the substrate, the thermogenic device is used for providing energy to the thermoacoustic elements to make the thermoacoustic elements generate heat, and at least one of the plurality of thermoacoustic elements comprises a graphene film. The invention further provides an electronic device using the thermoacoustic device.

The invention discloses an elastic film sound production medium motor-driven panel loudspeaker. Magnetic steel (3) is provided with a voice coil (4), and the voice coil (4) pushes a sound production medium to produce sound. The elastic film sound production medium motor-driven panel loudspeaker is characterized in that the pushing voice coil (4) of the loudspeaker is directly pasted on a sound production film (5) which has the thickness of less than 0.1mm and is made of stainless steel or aluminum or other thinner nonmetal flexible materials, such as terylene; the sound production film (5) is tightened to a fixed frame (1); and the magnetic steel (3) of the motor-driven panel loudspeaker is also suspended on the fixed frame (1) through an elastic connecting sheet (2). According to the invention, because the elastic state of the sound production medium overcomes the division distortion caused by light and thin materials, the manufactured panel loudspeaker is extremely high in sound production efficiency, is good in transient response, is wide in voice range, and has pleasing sound; the manufacturing technology is simple and is low in cost; and because the loudspeaker is high in efficiency, the power of audio frequency power amplifier can be lowered greatly, the volume of power amplifier can be reduced, and energy is saved.

The invention relates to a key-press input module which comprises a motor vehicle horn key-press, a stabilivolt tube DW2, a resistance R3 and a resistance R4, wherein one end of the motor vehicle horn key-press is connected with the power output positive end or the power output negative end of a motor vehicle battery jar, the other end of the motor vehicle horn key-press is connected with a digital signal input end IN1 of a single chip microcomputer through the resistance R3, the digital signal input end IN1 of the single chip microcomputer is also connected with a digital signal output end O1 through the resistance R4 and also the cathode of the stabilivolt tube DW2, the anode of the stabilivolt tube DW2 is in grounding, and one end of the motor vehicle horn key-press is connected with the power output positive end or the power output negative end of the motor vehicle battery jar through a single-pole double-throw switch. The invention provides the key-press input module which has the advantages of simple structure and convenient use.

A thermal sounding device comprises a substrate with a network structure, a thermal sounding element arranged on the surface of the substrate, and a heating device used for providing energy to the thermal sounding element to enable the thermal sounding element to produce heat, wherein the substrate comprises at least one lineage structure, the at least one lineage structure comprises a carbon nano tube lineage structure and an insulation layer positioned on the surface of the carbon nano tube lineage structure, the thermal sounding element comprises a composite film, and the composite film comprises at least one carbon nano tube layer and at least one graphene film with the carbon nano tube layer and the graphene film being stacked over each other. The invention further provides an electronic device using the thermal sounding device.

The invention relates to a miniature dual-drive broadband signal sounder of an automobile. The miniature dual-drive broadband signal sounder comprises two drivers. The two drivers share a bottom board and a plastic housing arranged on the bottom board, two cavities which are bilaterally symmetrical with each other are formed between the bottom board and the plastic housing, circuit boards, iron cores, coils, magnetic rings, membranes and mass slices are arranged in the cavities, the iron cores are arranged on the circuit boards, the coils are wound on the iron cores, the magnetic rings are arranged on the iron cores, the membranes are supported by the magnetic rings, the mass slices are arranged on the membranes, front cavities are formed between the plastic housing and the membranes, inner cavities are formed between the membranes and the iron cores, rear cavities are formed between the circuit boards and the bottom board, through holes are formed in the iron cores and the circuit boards, the inner cavities are communicated with the rear cavities via the through holes, and two sound production holes which are bilaterally symmetrical with each other are formed in the center of the upper wall of the plastic housing. The miniature dual-drive broadband signal sounder has the advantages that the miniature dual-drive broadband signal sounder is provided with the two drivers, the rear cavities are communicated with the inner cavities, accordingly, different frequencies can be generated by the signal sounder, the response frequency range of the signal sounder can be greatly broadened, the sound production efficiency of the signal sounder can be greatly improved, the transmitted sound volume of the signal sounder can be greatly increased, and the service range of the signal sounder can be extended.

The invention discloses a sound diffusion device which comprises a plurality of sound amplification plates arranged in an overlapped mode, each sound amplification plate comprises a vertical center line arranged vertically, the sound amplification plates are arranged symmetrically with the vertical center line as the axis, and the vertical center lines of the five sound amplification plates are arranged in an overlapped mode. The sound amplification plate comprises a first plate, a second plate, a third plate, a fourth plate and a fifth plate which are stacked in sequence, wherein the second plate, the third plate, the fourth plate and the fifth plate are arranged in a combined mode and used for shaping and diffusing sound waves emitted by the sound production device. The first plate is used for accommodating a sound production device; a first shaping hole and a second shaping hole which are the same in size are formed in the second plate and the fourth plate respectively, a shaping gap with the same shape and outer diameter as the first shaping hole is formed in the third plate, and a wave outlet allowing sound waves to penetrate out is formed in the fifth plate. According to thesound diffusion device, the sound wave generation path is changed through the shaping holes and the shaping gaps, sound diffusion is accurately controlled, meanwhile, the sound production efficiency is high, and the size of the device is small.