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46results about How to "Eliminate howling" patented technology
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Control method and system of intercom talking voice gateway of broadband and narrow band fusion on android platform.
ActiveCN106331380ARealize interconnectionImplement redundant configurationSubstation equipmentStations for two-party-line systemsBroadbandInterconnection
The invention discloses a control method and system of intercom talking voice gateway of broadband and narrow band fusion on android platform which comprises the set of the priority of the call app on the android platform.When users launch the voice forward from narrow band to broadband on the android platform, the gateway receives a narrow band intercom call start event and receives a broadband intercom start event after a broadband start;and at this point the direction of the gateway from narrow band to broadband and working state is connected;after receiving the narrow band intercom incoming call end event,the gateway stops the broadband intercom and sets the timed message;after receiving the broadband intercom call end event,the gateway cancels the timed message and reverts to the idle state and eliminate the end of the incoming call by the delay of timed message. The invention utilizes the gateway to connect the users of narrow band intercom of same frequency with the voices of broadband intercom of same group,which achieves the interconnection.
Owner:DATANG TELECOM TECH CO LTD
Volume control method and system
ActiveCN1885711AImplement volume limitAchieve multi-channel balanceTwo-way loud-speaking telephone systemsTelevision conference systemsVocal tractHigh-pitched
The disclosed auto gain volume control method for communication comprises: pre-defining voice flow state to decide in transmission for AGC and smooth transition from high pitch to silence. This invention overcomes defects of volume and voice discontinuity, and fit for video conference.
Owner:TENCENT TECH (SHENZHEN) CO LTD
Onsite classroom pickup and loudspeaking system adapted to position of a speaker
ActiveCN105142089ASuppress ambient noiseEliminate howlingPublic address systemsMouthpiece/microphone attachmentsEnvironmental noiseEngineering
The invention relates to an onsite classroom pickup and loudspeaking system adapted to the position of a speaker. The system comprises a pickup unit, a loudspeaker array and a processing circuit, wherein the pickup unit converts obtained audio signals of the speaker into electrical signal based on the position of the speaker, the processing circuit removes noises of the electrical signals and amplifies the de-noised signals to generate driving signals, and the loudspeaker array plays sounds of the speaker according to the driving signals. The system of the invention needs only one pickup unit, the speaker can walk in the classroom to teach class needless of wearing extra devices, local environmental noises can be effectively inhibited, and the problem of howling is eliminated.
Owner:厦门劢联科技有限公司
Method and system for eliminating microphone scream
ActiveCN105228056AEliminate howlingMouthpiece/microphone attachmentsTransducer circuitsAudio power amplifierLoudspeaker
The invention belongs to the technical field of sound systems, and discloses a method and a system for eliminating microphone scream, wherein the method and the system can detect and eliminate the sound of a frequency capable of generating scream. The method comprises the following steps that: a digital processing chip generates a sinusoidal signal of one frequency point, and outputs the sinusoidal signal to a power amplifier, and a loudspeaker outputs the sinusoidal signal; the digital processing chip receives input echo signals; the digital processing chip records amplitude peaks of the echo signals input from the first time to the Nth time; if the amplitude peaks decreases orderly, and the amplitude peak of the signal input at the Nth time is not more than an amplitude threshold, the digital processing chip determines that the signal of one frequency point cannot make the microphone generate scream; otherwise, the digital processing chip determines that the signal of one frequency point can make the microphone generate scream; if the signal of one frequency point can make the microphone generate scream, the digital processing chip obtains a pre-stored wave trap coefficient of one frequency point, and performs filtering for the signal of one frequency point, thereby eliminating the echo signal of one frequency point capable of making the microphone generate scream.
Owner:珠海市韵讯电子有限公司
Communication device and telephone communication method thereof
InactiveCN101043223AEcho CancellationEliminate howlingInterconnection arrangementsSubstation equipmentSound qualityTelephone communication
Owner:LG ELECTRONICS INC
Method and device for removing headset scream
ActiveCN103338419AEliminate howlingAvoid harmEarpiece/earphone attachmentsFrequency response correctionEngineeringHeadphones
The invention discloses a method and a device for removing a headset scream, which are suitable for a headset provided with a microphone and a loudspeaker and capable of transmitting a signal acquired by the microphone to the loudspeaker. The method comprises the steps as follows: receiving the signal acquired by the microphone and a signal required to be played by the loudspeaker; carrying out envelope energy detection on the signal acquired by the microphone and the signal required to be played by the loudspeaker; when the envelop energy value of the signal acquired by the microphone or the signal required to be played by the loudspeaker is more than a preset threshold value, obtaining a similarity value of the signal acquired by the microphone and the signal required to be played by the loudspeaker; and when the similarity value reaches a preset value, carrying out scream removal treatment. According to the technical scheme, the headset scream can be effectively removed and the injury to hearing of a headset wearer is avoided.
Owner:QINGDAO GOERTEK
Super wear-resistant water-lubricated bearing composite material and preparation method thereof
The invention discloses a super wear-resistant water-lubricated bearing composite material and a preparation method thereof, belonging to the field of macromolecule sliding bearings, and aiming at providing the water-lubricated bearing composite material which is good in abrasive resistance, low in wear rate and long in service life, and the preparation method of the water-lubricated bearing composite material. The super wear-resistant water-lubricated bearing composite material is prepared from the following raw materials in parts by weight: 40-80 parts of rubber, 20-60 parts of polyurethane rubber, 4-10 parts of zinc oxide, 1-3 parts of stearic acid, 0.2-6 parts of an accelerant, 0.5-3 parts of an anti-aging agent, 0.2-8 parts of a vulcanizing agent, 20-80 parts of carbon black, 5-60 parts of polytetrafluoroethylene radiated by a gamma ray or an electronic beam, 5-30 parts of a self-lubricating agent and 5-30 parts of reinforced fibers, wherein the rubber is one or more of nitrile rubber, carboxy nitrile rubber and hydrogenated nitrile rubber. The composite material has excellent abrasive resistance, low wear rate and long service life.
Owner:CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
Electronic device and control method
ActiveCN103905588AEliminate howlingImprove experienceTelephone set constructionsControl engineeringSelf adaptive
The invention discloses a control method for an electronic device. The control method for the electronic device is applied to the electronic device with a self-adaptation silencer and a state information collector. The control method for the electronic device comprises the steps of detecting whether the electronic device is in a preset work state; obtaining a first state parameter collected through the state information collector when the electronic device is in the preset work state; judging whether the first state parameter meets a preset condition, wherein the preset condition is used for indicating that a rear shell of the electronic device is shielded; and if yes, controlling the self-adaptation silencer of the electronic device to be in a closed state. The invention further discloses the electronic device. By means of the technical scheme, the electronic device and the control method for the electronic device can eliminate the howling of the electronic device and improve the experience of users.
Owner:LENOVO (BEIJING) LTD
Pneumatic pipeline conveying system and method
Owner:BEIJING RINRONG TECH
System and method for eliminating echo and howling in network sound transmission
ActiveCN106782592AEcho CancellationEliminate howlingSpeech analysisAudio electronicsComputer science
The invention discloses a system and a method for eliminating echo and howling in network sound transmission. On one hand, the method for eliminating echo and howling in the network sound transmission provided by the invention comprises the following steps: desampling audio signals which are inputted from a far end in real time so as to obtain first processed audio signals; desampling mixed audio signals of sound, which is acquired by virtue of a microphone and is transmitted from a sound box, and sound which is inputted from a near end in real time so as to obtain second processed audio signals; extracting and up-sampling signals, which are related to the first processed audio signals, in the second processed audio signals in real time so as to obtain third processed audio signals; and eliminating signals, which are related to the third processed audio signals, in the mixed audio signals acquired by virtue of the microphone so as to obtain output audio signals from which echo and howling are eliminated. On the other hand, the invention provides a system for eliminating echo and howling in the network sound transmission. With the application of the method and the system provided by the invention, echo and howling in the network sound transmission can be effectively eliminated, so that audio quality is guaranteed.
Owner:SYSU HUADU IND SCI & TECH INST +1
Method and system for reducing noise based on frequency characteristics
PendingCN107452394ASimple and clear identificationIncrease interactive funSpeech analysisTelephone set constructionsUsers perceptionsNatural property
The invention discloses a method and a system for reducing noise based on frequency characteristics. The method comprises the following steps: S10: acquiring a sound signal; S20: filtering the sound signal, so as to obtain a filtered signal, and decomposing the filtered signal into sound frequency domain signals; S30: acquiring a sound frequency domain which is required by a user; S40: implementing enhancement processing on a sound frequency domain signal which is required by the user, and implementing weakening processing on signals of other frequency domains, so that a playing frequency domain signal is obtained; and S50: reducing the playing frequency domain signal and playing sound. The method provided by the invention, which reduces the noise on the basis of the natural properties of the sound, is easy to implement and broad in application scope; and a voice scheme can be freely selected, so that voice delivery becomes more intuitive and valid, user perception is clearer and voice is easier to recognize.
Owner:台州市吉吉知识产权运营有限公司
Preparation method of silicon nitride combined silicon carbide friction material
The invention provides a C / SiC-Si3N4 friction material preparation method, which comprises: A) sequentially carrying out CVD densification and heat treatment on a C / C preform by using propylene as a carbon source and using nitrogen as a dilution gas to obtain a C / C porous matrix; B) siliconizing the C / C porous matrix by adopting an embedding method infiltration process to obtain a siliconized matrix; C) embedding the siliconized matrix into ceramic powder, and performing nitriding treatment in a nitrogen atmosphere to obtain a nitrided matrix; and D) immersing the nitrided matrix into a coating impregnation liquid, carrying out impregnation under a vacuum condition, and then carrying out curing treatment to obtain the C / SiC-Si3N4 friction material, wherein the coating impregnation liquid comprises a liquid A and a liquid B. According to the invention, the nitriding treatment process is added on the basis of the embedding method infiltration process, the friction surface is densified, the porosity is less than or equal to 5%, and the wet brake performance is attenuated by 6-13%.
Owner:HUNAN BOYUN NEW MATERIALS
Apparatus and method for processing voice in mobile communication terminal
InactiveUS20050261024A1Avoid howlingEliminate echoSubstation speech amplifiersSpannersHeadphonesAudio frequency
Disclosed are an apparatus and a method for processing voice in a mobile communication terminal, which may prevent howling and echo between a microphone and a receiver of the mobile communication terminal. The apparatus comprises: a main chip for controlling an audio codec; a microphone; a receiver; a handsfree for performing functions of inputting and outputting the voice; an earphone jack for connecting the handsfree to the audio codec; a hall IC for generating folder on / off detecting signal by sensing whether the folder of the mobile communication terminal is opened or closed; and a switch, located in between the microphone and the audio codec, for connecting the microphone and the audio codec based on the folder on / off detecting signal generated by the hall IC and jack detecting signal indicating that the handsfree is connected to the mobile communication terminal.
Owner:PANTECH CO LTD
Digital hearing-aid with customizable functioning mode and implementation method thereof
ActiveCN103152686ASolve fitting problemsImprove fitting accuracyDeaf-aid setsDigital signal processingPersonalization
The invention discloses a digital hearing-aid with a customizable functioning mode and an implementation method of the digital hearing-aid with the customizable functioning mode. The implementation method includes: (1) a microphone receiving a sound; (2) the sound entering an analog-to-digital conversion device to be converted to a digital signal; (3) on a hearing-aid software, selecting all functions according to needs, wherein the number of hearing-aid channels is an affirmatively chosen item; (4) a digital signal processor, based on digital signal processing (DSP), of the hearing-aid receiving the information of an upper layer checking and matching system and sending the information to a parameter control module; (5) a function management unit receiving the information of the parameter control module to achieve all the selected functions; (6) the signal entering a digital-to-analog conversion device to be reverted to a sound signal; and (7) a receiver receiving the signal and outputting the signal to a patient. All functions can be customized in a personalized mode according to the individual hearing loss situation of the patient and practical needs based on an identical hearing-aid, so that the purpose that various personalized hearing-aids with different functional modules are achieved is achieved, and the using is more economical, flexible and humanized.
Owner:BEIJING TSINGCREA DEV
Impeller and low-noise emulsifying pump
PendingCN111054230AReduce pressure differenceReduce frictionFlow mixersMixing methodsImpellerPressure difference
The invention relates to the technical field of emulsifying equipment, and concretely relates to an impeller and a low-noise emulsifying pump. The impeller comprises a stator and a rotor coupled withthe stator, and at least one shear blade of the rotor and / or at least one tooth blade of the stator are / is provided with a pressure reduction channel. When a fluid is homogenized, sheared and emulsified by the stator and the rotor which are coupled with each other, the shear blade of the rotor passes through the inner and outer layers of the tooth blade of the stator, the pressure reduction channel communicates the fluid on the two sides of the shear blade and / or the fluid on the two sides of the tooth blade, the pressure difference of the fluid on the two sides of the shear blade and / or the tooth blade is reduced, squeal generated during homogenizing, shearing and emulsifying is eliminated, and friction of the material with the rotor and the stator is reduced, so sound generated when thehomogenizing and shearing emulsifying pump works is reduced.
Owner:上海远安流体设备科技有限公司
DC-DC switching power supply and inductor squealing elimination method thereof
InactiveCN107947571AEliminate howlingDc-dc conversionElectric variable regulationSwitching signalInductor
The invention discloses a DC-DC switching power supply and an inductor squealing elimination method thereof. The switching power supply comprises a switching power supply control circuit used for generating a switching signal SW, a switching power supply output filtering circuit used for converting the switching signal SW generated by the switching power supply control circuit into a stable directcurrent voltage to be output, a voltage reduction circuit connected to the output end of the switching power supply control circuit and used for lowering the voltage of the switching signal when theswitching signal SW is high and providing a discharging access for a burr filtering circuit when the switching signal SW is low, and the burr filtering circuit connected between the voltage reductioncircuit and the ground in series and used for enabling the switching signal which is higher than a set voltage to be connected to the ground in a burr short-circuit processing manner when the switching signal SW is high, and discharging charges through the voltage reduction circuit when the switching signal SW is low. By virtue of the switching power supply, the current within the specific frequency range of the DC-DC switching power supply can be filtered out, and inductor squealing can be eliminated effectively.
Owner:台州市吉吉知识产权运营有限公司
Squeak prevention program control device for loudspeaking system
InactiveCN106231490AReduce the chance of howlingImprove user experienceTransducer protection circuitsFrequency/directions obtaining arrangementsSqueakVIT signals
The invention relates to a squeak prevention program control device for a loudspeaking system. The device comprises a microphone signal input interface, a bias amplifier circuit, an analog to digital converter, a program control module, a digital to analog converter and an audio signal output module. According to the program control module, a loudspeaker feedback signal received by a microphone is enabled to be an inverted signal through programming, a customized weak signal is dynamically removed according to a squeak analysis result, the received signal is dynamically changed to a delay value of a loudspeaker, finally, squeak is avoided, and a certain denoising effect is realized.
Owner:张兴
Earphone
ActiveCN111988698AImprove experienceSuppress different frequenciesMicrophonesLoudspeakersHeadphonesPickup
The invention discloses an earphone which comprises a shell, a loudspeaker and a microphone. The loudspeaker and the microphone are installed in the shell, and a sound outlet hole is formed in the shell and located at the front end of the loudspeaker; the shell forms a pickup tube which is isolated from the loudspeaker. The pickup pipe is provided with a sound pickup hole communicated with the outside, the microphone is arranged in the pickup pipe, the pickup pipe between the sound pickup hole and the microphone forms a squeal suppression pipeline, and the squeal suppression pipeline comprisesa main pipe and a variable cross-section pipe which is located in the middle of the main pipe and is different from the main pipe in cross-section area. By applying the earphone provided by the invention, through the arrangement of the squeal suppression pipeline, high-frequency standing waves with different frequencies generated by a small closed space cavity formed by the full-handshake palm and the earphone or the earphone and the battery compartment or the earphone and other small closed space cavities can be suppressed, and howling is eliminated.
Owner:GEER TECH CO LTD
Pulse ignition circuit based on Buck principle and gas wall-hanging furnace
ActiveCN109780569AImprove securityThe detection signal is accurateFluid heatersElectric spark ignitersComputer moduleEngineering
The invention discloses a pulse ignition circuit based on Buck principle and a gas wall-hanging furnace. The pulse ignition circuit comprises an ignition module, a flame detection module and a controller, wherein the flame detection module comprises a pulse and fire detection unit and a signal conversion module which are connected with the output end of the ignition module in sequence, and the signal conversion module is used for converting an analog signal output by the pulse and fire detection unit. A comparator is adopted to output a flame parameter signal, the I / U port connected with a flame detection signal is changed from an analog (AD) detection port to a normal detection port, and the detection signal is more accurate. Only high and low levels are arranged at a chip detection portreceiving the flame detection signal. As only the high and low levels are arranged at a flame detection end, the difficulty of hardware design and software programming is greatly reduced.
Owner:GREE ELECTRIC APPLIANCES INC
Buck principle based ignition and flame-detection circuit and fuel gas wall-hanging stove
The invention discloses a buck principle based ignition and flame-detection circuit and a fuel gas wall-hanging stove adopting the circuit. The buck principle based ignition and flame-detection circuit comprises a controller and an ignition module, wherein the ignition module comprises a voltage-reducing and detecting unit which is connected to an external direct-current power supply. Buck circuitinductance and load are charged together, and power of a bucket circuit is greater than boost, and therefore, inductance and a rectified circuit size are smaller than boost, and the cost can be saved; a high-frequency transformer sampling circuit is used to replace the original resistance type sampling circuit, so that safety is higher; a high-frequency transformer is adopted to replace inductance in an existing circuit, so that the inductance howling problem is eliminated; and feedback voltage of the transformer is adopted to effectively isolate high voltage of an ignition power supply froma controller chip, so that safety of the circuit is improved.
Owner:GREE ELECTRIC APPLIANCES INC
Vehicle rear independent main deceleration assembly
PendingCN109538715AShorten speedExtended service lifeToothed gearingsDifferential gearingsResonanceGear wheel
The invention discloses a vehicle rear independent main deceleration assembly. The vehicle rear independent main deceleration assembly comprises a connecting flange, a main decelerator shell, a driving tooth, a driven tooth, a differential machine assembly, and differential semi-shafts. The connecting flange is fixed to the driving tooth. The driven tooth is engaged with and fixed to the driving tooth. The differential machine assembly comprises a differential machine shell, two semi-shaft gears, and four planetary gears. The planetary gears are perpendicular to the two semi-shaft gears. Eachplanetary gear is engaged with and connected to one lateral faces of the two semi-shaft gears separately. The planetary gears are rotatably arranged in the differential machine shell. The other lateral ends of the semi-shaft gears are separately fixedly connected with the corresponding differential semi-shafts in a detachable mode. The differential semi-shafts are separately detachably fixed to corresponding tires. The driven tooth is detachably fixed to the outer edge of the differential machine shell. According to the vehicle rear independent main deceleration assembly, the structure is simple, noise during vehicle driving can be effectively reduced, the service life of the planetary gears can be effectively prolonged, torque transmission is stable, resonance is avoided, and NVH performance and riding comfort of the whole vehicle are effectively improved.
Owner:SAIC-GM-WULING AUTOMOBILE CO LTD
Universal joint nut and windproof supporting device for preventing clamping stagnation
The invention relates to the field of windproof equipment, and particularly relates to a universal joint nut and a windproof supporting device for preventing clamping stagnation. A sliding base and abottom plate are connected with an output shaft of a gear motor and a gear pair, wherein the gear pair is connected with a transmission shaft through a bearing in a supported mode; the transmission shaft is connected with a lead screw through a plug pin; the lead screw is connected with a sliding column on the universal joint nut; the sliding base is fixed to the bottom plate; the sliding column is mounted in the sliding base; and the lead screw pushes the universal joint nut to slide in the sliding base. The lead screw and the sliding column are connected through the universal joint nut, thelead screw and the sliding column can relatively rotate by a certain angle, and therefore the clamping stagnation phenomenon is eliminated.
Owner:WUHAN BINHU ELECTRONICS
High-efficiency and energy-saving furnace end and heating system
InactiveCN102183018AEliminate howlingReduce noiseGaseous fuel burnerHot-water central heatingSurface layerMetallurgy
The invention relates to a high-efficiency and energy-saving furnace end, which comprises a gas and air mixing chamber, wherein the gas and air mixing chamber is positioned in a furnace cavity and communicated with a combustion tray; a ceramic plate with holes is paved on a surface layer of the furnace cavity; a combustion surface which is shaped like the bottom of a pan is formed by the ceramic plate and the combustion tray; a distance between the combustion surface and the bottom of the pan is 1.5 centimetres (cm) to 2 cm; and a water pipe is arranged below the ceramic plate and used for supporting the ceramic plate and utilizing waste heat water. Meanwhile, the invention also discloses a heating system which consists of the energy-saving furnace end. Compared with the conventional heating mode, the heating system is energy-saving.
Owner:HANGZHOU LAINUOLI ENERGY SAVING TECH
Low-noise air channel
PendingCN106958711AAvoid colliding with each otherEliminate howlingPipeline expansion-compensationLow noiseEngineering
The invention provides a low-noise air channel. The low-noise air channel comprises an air channel box provided with an air outlet and at least two air inlet pipes arranged on the air channel box. Each air inlet pipe comprises a first straight pipe, a bent pipe and a second straight pipe, wherein the first straight pipe is fixed to the air channel box, the bent pipe is arranged in the air channel box, the inner wall of the bent pipe is smooth, the bent angle of the bent pipe is 75-105 degrees, the inlet end of the bent pipe is connected with the first straight pipe, the outlet end of the bent pipe is connected with the second straight pipe, the second straight pipe is arranged in the air channel box, and the center axis of the second straight pipe is parallel to the center axis of the air channel box. The low-noise air channel has the advantages of being low in noise, small in pressure loss, good in flow equalizing effect and the like.
Owner:CHINA INNOVATION INSTR CO LTD +1
Pneumatic pipe transmission system and method
The invention discloses a pneumatic pipe transmission system and a pneumatic pipe transmission method, relates to the field of pipe transmission systems, and solves the problems that the pneumatic pipe transmission system has complex structure and high fault rate in the prior art. The pneumatic pipe transmission system comprises a transmission pipeline. A transmitting work station and a receiving work station are arranged on the transmission pipeline. A transmitter inlet is formed at the transmitting work station, and a transmitter outlet is formed at the receiving work station. A door body is arranged at the transmitter inlet and the transmitter outlet respectively. The transmitting work station is connected with an air inlet line which is connected with an air source device. An air suction line is connected to the transmission pipeline close to the receiving work station, and is connected with the air source device. The pneumatic pipe transmission system and the pneumatic pipe transmission method are applied to the pneumatic pipe transmission.
Owner:BEIJING RINRONG TECH
Bluetooth hearing aid with voice input directivity
InactiveCN103024652AImprove hearing effectNoise isolationDeaf-aid setsComputer hardwareInformation processing
The invention relates to a bluetooth hearing aid with voice input directivity. The bluetooth hearing aid comprises a message receiving module, a message passing-on module and a bluetooth network, wherein the message receiving module is connected with the message passing-on module through the bluetooth network; and the message receiving module performs directivity microphone information processing on acquired environmental voice and then transmits the acquired environmental voice to the message passing-on module through the bluetooth network. Compared with the prior art, the bluetooth hearing aid has the advantages of effectively improving the hearing effect of users; manually setting the voice input directivity according to the users in different environments and the like.
Owner:SHANGHAI UNIVERSITY OF ELECTRIC POWER
Air guide structure and range hood
InactiveCN106839023AEliminate howlingImprove operational reliabilityDomestic stoves or rangesLighting and heating apparatusConvex structureTime difference
The invention provides an air guide structure and a range hood. The air guide structure comprises air guide plates and concave-convex structures, wherein the concave-convex structures are used for changing the air inlet frequency of the air guide plates and arranged on the surfaces of the sides, facing an air inlet of a panel of the range hood, of the air guide plates. The concave-convex structures used for changing the air inlet frequency of the air guide plates are arranged on the air guide plates, so that a certain time difference exists when air passes through the concave-convex structures on the air guide plates, differentiation of air speeds is enhanced, meanwhile, the inherent frequency of the air guide structure is changed, and the air inlet area is increased. Accordingly, a squeaking phenomenon of the air guide structure, namely the whole range hood is eliminated by means of a frequency balancing method, and the operation reliability of the range hood is improved.
Owner:ZHEJIANG SUPOR ELECTRICAL APPLIANCES MFG CO LTD
Anti-howling preceding connecting line for musical instrument
PendingCN109768443ASimple structureOmit the preamplifierCoupling device detailsLoudspeaker signals distributionToggle switchAmplifier
The invention provides an anti-howling preceding connecting line for a musical instrument. The connecting line comprises a data line and a preceding structure connected with the connecting line, wherein an input end and an output end are respectively arranged at the two ends of the data line; the preceding structure comprises a chip, a preceding audio processing circuit, a toggle switch and a power supply; the chip and the preceding audio processing circuit are connected and then connected with two wiring terminals of the toggle switch; the power supply is connected with the chip; and a positive input and a positive output of the power supply connected with the chip are respectively connected with two wiring terminals on the other side of the toggle switch. The preceding structure and theconnecting line serve as an integral structure or a split structure, so that a preceding power amplifier is omitted, the whole size is reduced, and collection and use are facilitated; connection or disconnection of the preceding structure can be controlled by the toggle switch, so that whether the preceding structure is required can be selected according to an actual condition, and the selectivityof a user is improved; and the connecting line can serve as a common connecting line for use when the power supply is powered off, so that an adaptation condition is increased.
Owner:HUIZHOU TIANYIN MUSICAL INSTR
Inductor assembly, preparation method thereof and display device
PendingCN114582612ASuppression of vibration amplitudeInhibition rangeNon-rotating vibration suppressionTransformers/inductances coils/windings/connectionsVibration amplitudeDisplay device
The invention provides an inductor assembly, a preparation method of the inductor assembly and a display device. The inductor assembly comprises an inductor, the inductor comprises a magnetic core, a magnetic ring and a multi-turn coil, the magnetic core is provided with a first bearing part, a winding part and a second bearing part which are connected in sequence, the magnetic ring is connected with the first bearing part and the second bearing part, the multi-turn coil is wound around the winding part, and a first gap is formed between every two adjacent coils; and the damping part is used for filling at least partial area of the first gap. According to the inductor assembly provided by the invention, the vibration amplitude and frequency of the multi-turn coil can be reduced by filling at least part of the area of the first gap with the vibration reduction piece, so that howling generated in the working process of the inductor is inhibited or even eliminated.
Owner:CHONGQING HKC OPTOELECTRONICS TECH CO LTD +1
A kind of preparation method of silicon nitride bonded silicon carbide friction material
The present invention provides a C / SiC‑Si 3 N 4 A method for preparing a friction material, comprising the following steps: A) using propylene as a carbon source and nitrogen as a diluent gas, performing CVD densification and heat treatment on a C / C preform in sequence to obtain a C / C porous matrix; B) combining C / C C porous substrate is siliconized by embedding method infiltration process to obtain siliconized substrate; C) embed the siliconized substrate in ceramic powder, and carry out nitriding treatment under nitrogen atmosphere to obtain nitrided substrate; D) The nitrided substrate is immersed in the coating impregnation solution, impregnated under vacuum conditions, and then cured to obtain C / SiC-Si 3 N 4 Friction material; the coating impregnating liquid includes liquid A and liquid B. The present invention adds a nitriding treatment process on the basis of the embedding method infiltration process, and densifies the friction surface so that the porosity is ≤5%, and the braking performance in wet state is attenuated by 6%-13%.
Owner:HUNAN BOYUN NEW MATERIALS
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