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75results about How to "Good offsetting effect" patented technology
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Device for receiving in-band interference in wireless transceiving system with adaptive counteracting function and counteracting method
The invention discloses a device for receiving in-band interference in a wireless transceiving system with an adaptive counteracting function and a counteracting method. The function of the device isas follows: a transmission signal of a signal coupled from a radio frequency transceiving channel is filtered by a wave trap, and then divided by an amplification and power division device, one signalreaches a counteracting circuit after being delayed, the other signal which is the same as an in-band receiving signal and generated by a receiving signal generation unit is counteracted with an original receiving signal at the counteracting circuit, a data processing unit adjusts an amplitude and phase modulation device according to the size of the signal detected by the receiving signal detection circuit until the received signal is less than a preset value, the amplitude and phase of the interference signal are counteracted by a data processing unit according to the size of the detected in-band receiving interference signal, and adjusted inference signal is fed into a main receiving channel to counteract an in-band interference signal in the main channel, and thus the problem of in-band interference of the main channel is solved. According to the device and method provided by the invention, the received in-band interference signal can be adaptively counteracted according to the variation of the receiving interference signal, and the deficiency that in traditional ways, only the in-band interference of a certain fixed frequency point can be solved via the wave trap is overcome.
Owner:沃勤科技有限公司
Active broadband matching method of short-wave frequency-band electrically small antenna and matching circuit thereof
InactiveCN104202007AGood offsetting effectMultiple-port networksTransmissionCapacitanceTransmission line transformer
The invention discloses an active broadband matching method of a short-wave frequency-band electrically small antenna and a matching circuit thereof, the electrically small antenna is matched by a non-Forster reactive element and a passive broadband matching network, the non-Forster reactive element is realized by a negative impedance converter, the negative impedance converter and the passive broadband matching network are cascaded into an active broadband matching network with two ports, one port of the matching network is connected with the electrically small antenna, and said two ports are connected with an emitter / receiver. In the invention, the non-Forster reactive element and the passive broadband matching network are comprehensively considered, led loss is regulated in realization process of the non-Forster reactive element, single traditional negative capacitor can be replaced by in series connecting a negative capacitor and a negative inductor to better neutralize the impedance imaginary part, a transmission line transformer is led into the matching network, and the deviation between a testing value and a design value can be compensated by slightly adjusting the transformation ratio of the transmission line transformer.
Owner:XIDIAN UNIV
Signal cancelling method and apparatus of wireless communication system
ActiveCN104168234AEliminate leaksEasy to controlModulated-carrier systemsTransmitter/receiver shaping networksCommunications systemSignal cancellation
Disclosed is a signal cancellation method for a wireless communication system, comprising: performing shunting processing on sent signals to obtain a main channel signal which is transmitted over a main channel and an auxiliary channel signal which is transmitted over an auxiliary channel; performing digital domain channel characteristic matching processing on the main channel signal and the auxiliary channel signal respectively, to obtain a main channel characteristic matched signal and an auxiliary channel characteristic matched signal; and performing combination processing on the main channel characteristic matched signal and the auxiliary channel characteristic matched signal which are coupled to a receiving channel, so as to perform signal cancellation. Also disclosed is a signal cancellation device for a wireless communication system. By means of the technical solution of the present invention, the signal cancellation problem of broadband can be better solved.
Owner:ZTE CORP
Structure of loudspeaker for reducing thickness and mounting depth
A structure of a loudspeaker is designed to decrease a thickness or height thereof, thereby reducing a mounting depth of the loudspeaker on a mounting panel or wall. The loudspeaker includes a speaker frame, a diaphragm connected to the speaker frame in a manner capable of vibration, a voice coil connected to the diaphragm through a coil bobbin to receive an electric signal to vibrate the diaphragm, a spider connected to the speaker frame and to the diaphragm for supporting the diaphragm and the voice coil in a flexible manner, a magnetic assembly including a top plate, a permanent magnet and a pole piece for creating a magnetic circuit for interaction with the voice coil inserted in an air gap, and a plurality of cut-outs formed on a top of the magnetic assembly at an outside thereof to receive therein corresponding suspension elements of the spider.
Owner:ALPINE ELECTRONICS INC
Vibration-reduction receiver support seat with adjustable levelness
InactiveCN104565722AAdjust levelGood vibration dampingNon-rotating vibration suppressionHigh internal friction springsVulcanizationArchitectural engineering
The invention discloses a vibration-reduction receiver support seat with an adjustable levelness. The vibration-reduction receiver support seat with the adjustable levelness comprises an upper flange, a support plate, a base, vibration-reduction elements, a telescopic sleeve and a telescopic rod, wherein the upper flange and the support plate are respectively of a disk shape structure; the base is of an upside-down bowl style structure; each vibration-reduction element is in a cylindrical shape and is wholly formed by vulcanization of a spring, a bolt and vibration-reduction rubber; the support plate and the base are connected into a whole through the vibration-reduction elements; the four vibration-reduction elements are arranged on the plane of the upper flange in a central symmetry way; one end of the telescopic sleeve is fixedly connected with the upper surface of the support plate; one end of the telescopic rod is fixedly connected with the bottom surface of the upper flange; the telescopic rod and the telescopic sleeve are distributed on the respective connecting surfaces in a central symmetry way; a locking bolt penetrates through a sleeve wall to lock the telescopic rod along the radial direction of the telescopic sleeve. According to the support seat, not only is the favorable vibration-reduction effect is achieved, and the receiving precision of a receiver can be improved, but also the levelness of the support seat can be conveniently adjusted, and the receiver can be enabled to be at the best working condition.
Owner:GUIZOU QIANCHENGTIANLI INTELLIGENT TECH
Treatment of Severe Hyperlipidemia
InactiveUS20160279085A1Low LDL-CGreat loweringOrganic active ingredientsAntibody ingredientsAcetic acidSecondary hyperlipidemia
Treatment of severe hyperlipidemia by administration of (R)-2-(4-((2-ethoxy-3-(4-(trifluoromethyl)phenoxy)propyl)thio)-2-methylphenoxy)acetic acid or a salt thereof in combination with a PCSK9 inhibitor.
Owner:CYMABAY THERAPEUTICS
Mechanical hoisting apparatus
The invention discloses a mechanical hoisting apparatus. The apparatus comprises a pedestal; a rotary table which can rotate horizontally is arranged on the pedestal; a hoist boom is arranged on the rotary table, the hoist boom is provided with the first hoister, and the top of the hoist boom is provided with a pulley for carrying articles; a suspension cable in the first hoister protrudes and extends as well as surrounds a pulley for loading articles at the top of the hoist boom, and the end of the suspension cable is provided with a main suspension hook; the end of the hoist boom far from the rotary table is provided with a horizontally arranged slide arm, and the side arm is provided with an electric hoist which can move along the slide arm. An auxiliary suspension hook which protrudesby the electric hoist is matched with the main suspension hook, in order to realize the effects for facilitating fixation of articles and enhancing stability of fixed articles; compared with the single suspension cable fixed article, the electric hoist and double suspension cables of the first hoister are used for carrying out fixation of double ends of the articles which need to be carried, and judgment of center of gravity of an object and selection of fixed hoisting points, adjustment and other workloads are reduced; inclination resistance and migration capability of the object during air suspension and movement are enhanced, and throwing and falling probability of the object are reduced.
Owner:乐清日盛建设有限公司
Port returning anti-collision ship mechanism
PendingCN107776844AReduce vibrationReduce impact forceCollision preventionMarine engineeringStructural engineering
Owner:泰兴市汇辰过滤器制造有限公司
Receiver supporting base based on tapered damping elements and gradienter
InactiveCN104595419AAdjust levelGood vibration dampingNon-rotating vibration suppressionHigh internal friction springsArchitectural engineeringFlange
The invention discloses a receiver supporting base based on tapered damping elements and a gradienter. The receiver supporting base comprises an upper flange, a supporting plate, a base, the damping elements, telescopic sleeves and telescopic rods. Both the upper flange and the supporting plate are of a disc-shaped structure. The upper flange is provided with the gradienter. The base is of an inverted-bowl-shaped structure. The profile of the damping elements is tapered. The supporting plate and the base are connected into a whole through the damping elements. The damping elements are four in number and centrally symmetrically arranged on the plane of the upper flange. One end of each telescopic sleeve is fixedly connected with the upper surface of the supporting plate. One end of each telescopic rod is fixedly connected with the bottom face of the upper flange. The telescopic rods and the telescopic sleeves are centrally symmetrically distributed on the corresponding connection surfaces. Locking bolts penetrate through the sleeve walls of the telescopic sleeves in the radial direction of the telescopic sleeves and lock the telescopic rods. The supporting base has the good damping effect, and by means of the supporting base, the receiving accuracy of a receiver can be improved, the levelness of the supporting base can be adjusted conveniently and fast, and it is guaranteed that the receiver is in the best working state.
Owner:GUIZOU QIANCHENGTIANLI INTELLIGENT TECH
A wireless device and a wireless local area network signal receiving method
ActiveCN109861703AAvoid confictReduce throughputNetwork topologiesCommunication jammingTelecommunicationsInterference canceller
The invention provides wireless equipment and a wireless local area network signal receiving method, and belongs to the technical field of communication. Wherein the wireless device comprises a receiver, a jammer, an interference eliminator, a first antenna and a second antenna, the receiver is connected with the first antenna, the jammer is connected with the second antenna, the input end of theinterference eliminator is connected with the second antenna, and the output end of the interference eliminator is connected with the first antenna; The receiver is used for detecting a wireless localarea network signal; The jammer is used for sending an interference signal on a channel where the wireless local area network signal is located through the second antenna; And the interference eliminator is used for generating a reconstructed signal for cancelling the interference signal received by the first antenna based on the interference signal, and providing the reconstructed signal at theoutput end, so that the conflict of the signals of the wireless local area network is avoided, and no extra air interface resource is occupied. And moreover, the interference to the receiver can be eliminated in the process of sending the interference signal, so that the receiver can normally receive the wireless local area network signal.
Owner:HUAWEI TECH CO LTD
Slope protection device for engineering investigation
InactiveCN112647520ASlow downReduce impactProtective constructionClimate change adaptationGeotechnical engineeringStructural engineering
Owner:韦宗海
Carrier balancing radio frequency predistortion power amplifier realizing apparatus and method
ActiveCN101286962AImprove linearitySolve efficiency problemsAmplifier modifications to reduce non-linear distortionSynchronous/start-stop systemsCarrier signalRadio frequency
The invention relates to a device and a method for fulfilling carrier cancellation radiofrequency predistortion power amplification, which improves the traditional carrier cancellation method by extracting error signals, amplifying the error signals, adjusting the phase of the error signals, synthesizing the error signals and main signals, amplifying the power of the synthesis signals and flexibly adjusting the amplitude and phase of the error signals according to final results, thereby greatly reducing debugging difficulty and time and ensuring the optimal predistortion effect due to the fulfillment of the flexible adjustment of the amplitude and phase of the error signals.
Owner:WUHAN HONGXIN TELECOMM TECH CO LTD
Electrospinning array nozzle
InactiveCN107245763AHigh densityGood offsetting effectFilament/thread formingElectrospinningVolumetric Mass Density
The invention discloses an electrospinning array nozzle. The array nozzle comprises a spraying body and spinning nozzles, wherein a solution flows in a solution channel, passes through connecting holes, and finally is sprayed out from the spinning nozzles, and the connecting holes are distributed on the top surface and two slopes of the spraying body; included angles are formed by the spinning nozzles on different surfaces, and the solution is sprayed out from the spinning nozzles under the guidance of electric field forces; electric fields of any two adjacent spinning nozzles have mutual influences, and the component, perpendicular to the direction of the corresponding spinning nozzle, of each electric field force is counteracted; the solution moves in the direction of the spinning nozzles under the guidance of the electric field forces, so that the formed spinning quality can be improved; in the projection of a horizontal plane, the connecting holes are divided into multiple groups, each group of connecting holes form a regular hexagon, and one connecting hole is formed in the center of each regular hexagon; the spinning nozzles at vertexes of each regular hexagon is located on a same circumscribed circle, so that the counteracting effect of the electric field forces can be optimal, the density is higher, and meanwhile multiple-spinning operation can be carried out at the same time; thus, the efficiency of industrial production is higher.
Owner:GUANGDONG UNIV OF TECH
Flying rock blasting protection device
PendingCN108981517APlay the role of the first layer of protectionAvoid harmBlastingEngineeringMechanical engineering
The invention discloses a flying rock blasting protection device. The flying rock blasting protection device comprises baffle plates; connection blocks are fixedly arranged on one end side wall of each baffle plate through screws; a connector is arranged on one side of each connection block; fixing blocks are welded to the other end of each baffle plate; an elastic rod is fixedly arranged on one end side wall of each fixing block through a screw; two ends of each elastic rod are fixedly provided with fixing blocks; one side of each of the fixing blocks on the inner sides of the elastic rods isfixedly provided with assembly blocks; one end of each assembly block is connected to an assembly shaft through a key; one end side wall of each assembly shaft is rotatably connected with a rotary rod; the other end of each rotary rod is riveted with a sliding block; each sliding block is slidably arranged on the outer end of a connection rod in a sleeving manner; one end side wall of each baffleplate is connected with a fixing component; sliding components are arranged on each fixing component; the other end of each sliding component is fixedly provided with a rotating component through a screw; a placement block is fixedly arranged on one end side wall of each sliding component through a screw; according to the flying rock blasting protection device, impact generated by blasting of flying rocks is counteracted with the effect of triple buffering, and the counteracting effect is good; and user safety can be better protected.
Owner:六盘水久翔爆破工程有限责任公司
Echo cancelling method based on self-adaptive time delay estimation
The invention provides an echo cancelling method based on self-adaptive time delay estimation. The echo cancelling method is used for cancelling an echo between a speaking end and a listening end of a communication system, the speaking end generates a speech signal and transmits the generated speech signal to the listening end; an echo signal which can return to the speaking end is generated between the speaking end and the listening end. The echo cancelling method is characterized by comprising the following steps of: (a) acquiring the echo signal to be used as an actual echo signal; (b) generating an analogue echo signal according to the echo signal; and (c) subtracting the actual echo signal from the analogue echo signal to reduce the echo electric level for returning the echo signal of the speaking end. The method not only can effectively cancel the echo containing Gaussian noise in a communication line, but also can well cancel echo containing impulse noise.
Owner:SHANGHAI DIANJI UNIV
CMOS radio frequency power amplifier
ActiveCN103780207AImprove linearityHigh gainHigh frequency amplifiersPower amplifiersCMOSRadio frequency
The invention discloses a CMOS radio frequency power amplifier. The CMOS radio frequency power amplifier comprises an MOS transistor and a bipolar transistor. A biasing circuit of the MOS transistor enables the MOS transistor to work at a saturation region, and a biasing circuit of the bipolar transistor is regulated to enable the absolute value of the third-order nonlinear coefficient of the bias current of a collecting electrode of the bipolar transistor to get close to the absolute value of the third-order nonlinear coefficient of the bias current of each of a source electrode and a drain electrode. Because the plus and minus of the third-order nonlinear coefficients of two transistors are opposite, the third-order nonlinear coefficients of the transistors can be counteracted in the best effect, the third-order cut-off point number of the CMOS radio frequency power amplifier is increased, the linearity of the amplifier is improved, the gain performance and the noise performance of the amplifier are improved, and the overall function of the amplifier is improved and optimized.
Owner:SHANGHAI HUAHONG GRACE SEMICON MFG CORP
High frequency power amplifier
InactiveUS20120188010A1Cancellation effectHigh suppression characteristicsPush-pull amplifiersPhase-splittersHigh frequency powerAudio power amplifier
A power amplifier includes an amplifying circuit, and first through third transmission lines. The amplifying circuit amplifies an input signal having a fundamental frequency to generate a first amplified signal and a second amplified signal whose phase is opposed to the first amplified signal. The first transmission line adds a first group of phases, different in correspondence with a frequency, to the first amplified signal by using a left-handed material to generate a first transmission signal. The second transmission line adds a second group of phases, different in correspondence with a frequency, to the second amplified signal by using a right-handed material to generate a second transmission signal. The third transmission line overlaps the first and the second transmission signals to generate an output signal. The first and the second group of phases include a phase difference configured to weaken a second harmonic and a third harmonic.
Owner:NEC CORP
I/Q imbalance cancellation algorithm based on affine projection adaptation
ActiveCN106961402AIntegrity guaranteedGuaranteed correctnessTransmitter/receiver shaping networksLinear modelSelf adaptive
The invention provides an I / Q imbalance cancellation algorithm based on affine projection adaptive filtering, relating to a blind cancellation algorithm without training sequences. The whole cancellation process is modeled as an adaptive filtering mode, a wide linear model is used as the filtering structure prototype of a neutralizing filter, the restoration the 'moderation' of signals disturbed by I / Q imbalance is taken as the goal, and an adaptive process of the filter is deduced based on the principle of affine projection adaptation, which means that an update iteration rule of filter tap weights is obtained. Additionally, combined with some improvements of I / Q imbalance situations, the algorithm can be applied to engineering practices; and finally, the overall operation flow of the cancellation algorithm can be obtained; and computer simulation results can verify that the impact of the I / Q imbalance on the signals can be effectively canceled by the algorithm, and meanwhile, compared with a traditional cancellation algorithm, the algorithm provided by the invention has a faster convergence rate and more stable MSE performance.
Owner:SOUTHEAST UNIV
Carrier wave offset circuit based on RFID reader-writer, and RFID reader-writer
ActiveCN104123571AGood offsetting effectSimple demodulationCo-operative working arrangementsCarrier signalPower detector
The invention is applicable to the field of circuits and particularly relates to a carrier wave offset circuit based on an RFID reader-writer and the RFID reader-writer. In a work process of the RFID reader-writer, a controller adjusts the impedance of an impedance conversion circuit so as to adjust reception signals received by a demodulator. When a power detected by a power detector is lowest, it is represented that an offset effect of reflection signals of the impedance conversion circuit on leakage carrier wave signals are optimal so that it is easier for the demodulator to demodulate correct tag signals.
Owner:SHENZHEN MARKTRACE
Radio frequency interference canceller and method
The invention discloses a radio frequency interference canceller and a method. The radio frequency interference canceller comprises a controller, a first power amplifier, a digital filter, a second power amplifier, a first analog-to-digital converter, a second analog-to-digital converter, a first digital-to-analog converter, a second digital-to-analog converter, a splitter and a combiner. The splitter is in gating connection with a transmitter power amplifier and the first power amplifier, the output end of the splitter is connected with the transmitting antenna, and the coupling end of the splitter is connected with the second analog-to-digital converter. The controller, the first digital-to-analog converter and the first power amplifier are connected in sequence; the second analog-to-digital converter, the digital filter, the second digital-to-analog converter and the second power amplifier are sequentially connected, the second power amplifier is further connected with the coupling end of the combiner, the input end of the combiner can be disconnected with the receiving antenna, and the output end of the combiner is in gating connection with the first analog-to-digital converter and the low-noise amplifier; the first analog-to-digital converter is also connected with the controller; the digital filter is further connected with the controller.
Owner:36TH RES INST OF CETC
Cross solenoid magnetic coupling mechanism with high offset performance
ActiveCN113793746AWide constant mutual inductance regionGood offsetting effectCharging stationsTransformersTransmitter coilInductance
The invention discloses a cross solenoid magnetic coupling mechanism with the high offset performance, and relates to the field of wireless power transmission, the cross solenoid magnetic coupling mechanism comprises a transmitting structure and a receiving structure which are oppositely arranged, the receiving structure comprises a receiving magnetic conductive sheet and two receiving coils wound in the middle of the receiving magnetic conductive sheet in a cross orthogonal mode; the short side and the long side of a transmitting magnetic conductive sheet in the transmitting structure are not smaller than the side length of a receiving magnetic conductive sheet, a first transmitting coil is wound in the middle of the transmitting magnetic conductive sheet in the long side direction, and a second transmitting coil and a third transmitting coil are wound at the two ends of the transmitting magnetic conductive sheet in the short side direction respectively. The fourth transmitting coil is wound in middle of the transmitting magnetic conductive sheet along the short edge direction. The cross solenoid magnetic coupling mechanism has a wider constant mutual inductance area, can provide a larger and more stable working area for a receiving structure, has high offset performance, and can be used for occasions with higher requirements on offset resistance performance.
Owner:JIANGNAN UNIV
A mechanical lifting device
ActiveCN108100872BEasy to fixImprove stabilityLoad-engaging elementsCranesMechanical liftGravity center
Owner:乐清日盛建设有限公司
Automobile intelligent noise reduction control system
PendingCN112879142AImprove ride comfort performanceReduce noiseInternal combustion piston enginesExhaust apparatusNoiseControl system
The invention belongs to the technical field of automobile production, and particularly relates to an automobile intelligent noise reduction control system which comprises a three-insertion-tube three-cavity reactive silencer, an audio system, a self-adaptive control device, a microphone, a rear secondary loudspeaker and a front secondary loudspeaker. The feedback type active noise control set is adopted, on the basis of traditional passive sound insulation, the noise reduction effect is further improved, noise generated in the automobile running process is reduced to the maximum extent, and the taking comfort of passengers is improved.
Owner:GUILIN UNIV OF ELECTRONIC TECH
Automatic screening device for neodymium iron boron magnetic powder and automatic screening method thereof
ActiveCN110639698AReal-time speed controlFully screenedMagnetic separationGrain treatmentsScreening effectMetallurgy
The invention discloses an automatic screening device for neodymium iron boron magnetic powder and an automatic screening method thereof. The automatic screening device comprises a screening barrel, adispersing mechanism, a deviating mechanism, a collecting mechanism, a detecting mechanism and a controller. The dispersing mechanism comprises a feeding pipe, a rotating cylinder, a cutting assemblyand a driving assembly. The deviating mechanism comprises a protection plate and a plurality of magnets. The collecting mechanism comprises a first collecting barrel, a first telescopic assembly, a plurality of second collecting barrels and a plurality of second telescopic assemblies. The detecting mechanism is used for detecting the collecting amount of the neodymium iron boron magnetic powder in the first collecting barrel and the second collecting barrels. The controller is used for adjusting the rotating speed of the rotating cylinder through the driving assembly according to the specificgravity of blocky powder balls in the neodymium iron boron magnetic powder per unit volume and a data corresponding relation in a preset specific gravity-rotating speed comparison table. The screening efficiency of the neodymium iron boron magnetic powder is improved. The caked neodymium iron boron magnetic powder can be cut up, so that the screening effect is improved, and the screening qualityand purity of the neodymium iron boron magnetic powder are guaranteed.
Owner:安徽万磁电子股份有限公司
Vibration reduction receiver supporting seat with adjustable levelness
InactiveCN104613290AAdjust levelGood vibration dampingNon-rotating vibration suppressionHigh internal friction springsVulcanizationArchitectural engineering
The invention discloses a vibration reduction receiver supporting seat with the adjustable levelness. The vibration reduction receiver supporting seat comprises an upper flange, a supporting plate, a base, vibration reduction elements, telescopic sleeves and telescopic rods. The upper flange and the supporting plate are of disc-shaped structures. The base is of a reversely-buckled bowl-shaped structure. The vibration reduction elements are conical in appearance and are wholly composed of springs, bolts and vibration reduction rubber in a vulcanization mode. The supporting plate and the base are integrally connected through the vibration reduction elements, and the four vibration reduction elements are arranged in a central symmetry mode on the plane of the upper flange. One ends of the telescopic sleeves are fixedly connected with the upper surface of the supporting plate, one ends of the telescopic rods are fixedly connected with the bottom face of the upper flange, and the telescopic rods and the telescopic sleeves are distributed in central symmetry on the respective connecting surfaces. Locking bolts penetrate through sleeve walls in the radial direction of the telescopic sleeves to lock the telescopic rods. The supporting seat has a good vibration reduction effect, the receiving precision of a receiver can be improved, the levelness degree of the supporting seat can be conveniently adjusted, and it is ensured that the receiver is in the optimal working state.
Owner:GUIZOU QIANCHENGTIANLI INTELLIGENT TECH
Intelligent head-mounted device
ActiveCN113556655ABalanced sound qualityGood offsetting effectFrequency/directions obtaining arrangementsNon-optical adjunctsLoudspeakerMechanical engineering
The invention discloses an intelligent head-mounted device. The intelligent head-mounted device comprises a device shell and a loudspeaker module installed in the device shell, wherein the device shell is provided with a front sound outlet hole and a rear sound outlet hole; the loudspeaker module comprises a module shell and a loudspeaker individual; the module shell is provided therein with an installation space; the module shell is provided with a sound outlet hole and a sound leakage hole; the sound outlet hole is in communication with the front sound outlet hole; the sound leakage hole is in communication with the rear sound outlet hole; the loudspeaker individual is arranged in the installation space and comprises a vibrating diaphragm capable of vibrating to produce sound; an effective volume on a path from a first side of the vibrating diaphragm to the sound outlet hole forms a front sound cavity; an effective volume on a path from a second side of the vibrating diaphragm to the sound leakage hole forms a rear sound cavity; the volume V1 of the front sound cavity and the volume V2 of the rear sound cavity meet the relational expression that V1 / V2 is larger than or equal to 0.42 and smaller than or equal to 2.5. The invention aims to provide the intelligent head-mounted device which can effectively improve the sound leakage of a product and widen the high-frequency cut-off frequency.
Owner:GOERTEK INC
A device and method for adaptively canceling receiving in-band interference in a wireless transceiver system
Owner:沃勤科技有限公司
Receiver supporting base based on cylindrical damping components and level gauge
InactiveCN104653983AAdjust levelGood vibration dampingNon-rotating vibration suppressionHigh internal friction springsWhole bodyEngineering
The invention discloses a receiver supporting base based on cylindrical damping components and a level gauge. The receiver supporting base comprises an upper flange, a supporting plate, a base, the damping components, a telescopic sleeve and a telescopic rod; both the upper flange and the supporting plate are of a disk-shaped structure; the level gauge is arranged on the upper flange; the base is of an inverted bowl-shaped structure; the appearance of each damping component is of a cylinder shape; the supporting plate is connected with the base into one whole body by the damping components; three damping components are provided and are centrally symmetrically arranged on the plane of the upper flange; one end of the telescopic sleeve is fixedly connected with the upper surface of the supporting plate; one end of the telescopic rod is fixedly connected with the bottom surface of the upper flange; the telescopic rod and the telescopic sleeve are centrally symmetrically distributed on the corresponding connecting surfaces; a locking bolt passes through the sleeve wall along the radial direction of the telescopic sleeve to lock the telescopic rod. Not only does the supporting base have an excellent damping effect and the receiving accuracy of a receiver can be improved, but also the levelness of the supporting base can be conveniently and rapidly regulated and the receiver is enabled to be in the optimal working state.
Owner:GUIZOU QIANCHENGTIANLI INTELLIGENT TECH
High-linearity transconductance circuit
ActiveCN113328710AImprove IIP3 performanceDoes not change the output sizeDifferential amplifiersDc-amplifiers with dc-coupled stagesHemt circuitsEngineering
The invention provides a high-linearity transconductance circuit, and the circuit comprises a differential input stage circuit which converts an input voltage signal into a current signal; an IM2 injection circuit which is used for realizing direct current coupling injection of IM2 and comprises a first PMOS transistor M4, a second PMOS transistor M5, a third PMOS transistor M7 and a first resistor R1, wherein the feedback loop is used for forming negative feedback and comprises a fourth PMOS transistor M6, a fifth PMOS transistor M8, a second resistor R2 and an operational amplifier OP. According to the invention, IM2 direct current injection is adopted, so that the frequency interval of the double Tones can be expanded to be near the direct current, the injection position of the IM2 is changed from the grid electrode of the tail current tube to the grid electrode of the common-grid input differential pair tube, the IM3 item offset effect is obviously improved, the IIP3 performance of the circuit is greatly improved, and the anti-interference performance of the receiver is improved.
Owner:SHANGHAI CHIPANALOG MICROELECTRONICS LTD
Arch bridge type cross-over pile foundation bearing platform structure and manufacturing method thereof
InactiveCN106368230AStable structureImprove reliabilityBridge structural detailsFoundation engineeringStructure of the EarthEngineering
The invention discloses an arch bridge type cross-over pile foundation bearing platform structure and a manufacturing method thereof. The arch bridge type cross-over pile foundation bearing platform structure comprises an arch bridge type cross-over bearing platform (1). End bearing piles (3) are mounted on stable bed rocks in a stratum. Pile foundation bearing platforms (2) are mounted on the end bearing piles (3). The arch bridge type cross-over bearing platform (1) is mounted on the pile foundation bearing platforms (2). Prestressed anchor cables (4) are mounted in an arch of the arch bridge type cross-over bearing platform (1). Traditional buildings usually selectively avoid river channels and rivers. Buildings can be built on river channels with small widths and depths such as artificial rivers in campuses through some kind of cross-over structures. The degree of beauty of the buildings goes without saying. By adopting the cross-over pile foundation bearing platform structure, the problems of no relevant structures used for construction of buildings on river channels and how to build the buildings on the river channels with small widths and depths at present are solved.
Owner:ZHENGYE ENG & INVESTMENT INC
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