75results about How to "Good offsetting effect" patented technology

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.

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.

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.

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.

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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.

The invention discloses a port returning anti-collision ship mechanism. The port returning anti-collision ship mechanism comprises a main board, wherein an elastic plate is arranged on the upper surface of the main board; a collision plate is connected above the elastic plate through an elastic connecting rod; a bottom plate is connected to the center of the bottom of the main board through a spring; an elastic fitting plate is arranged below the bottom plate; fixing screws are arranged at two ends of the bottom plate; damping devices are arranged on two sides of the bottom of the main board;and pistons are arranged inside the damping devices. According to the port returning anti-collision ship mechanism, the collision plate is of an arc-shaped structure, and is connected with the elasticplate on the main board through the elastic connecting rod, so that slight collision force can be reduced when the device is collided, and vibration of a ship is reduced; the elastic fitting plate isarranged on the bottom surface of the bottom plate, so that the device can be stably mounted; and due to a multi-layer buffer structure, the device has good buffer force reduction and counteraction effect, and the anti-collision effect of the device is improved.

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.

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.

The invention discloses a slope protection device for engineering investigation, and belongs to the technical field of engineering slope protection. A buffer seat and a buffer encapsulation layer are separated, so that when the slope protection device is impacted by falling rocks of a slope, the buffer encapsulation layer is used as a first buffer defensive line; the liquid buffer part in the buffer encapsulation layer is matched with an outer encapsulation, so that the impact force is counteracted, and the buffer encapsulation layer is protected by virtue of liquid fluidity; the falling rocks which partially counteract the impact force fall onto the buffer seat, and the buffer seat and a plurality of buffer bodies are used as a second buffer defensive line; the buffer seat is separated from the buffer encapsulation layer after being pressed downwards so as to impact the buffer bodies on the bottom end of the buffer seat, and the plurality of buffer bodies are evenly stressed, so that the downward pressing speed of the buffer seat is greatly reduced; and after an upper buffer layer is separated from the buffer encapsulation layer, the falling rocks can fall down through a gap formed between the upper buffer layer and the buffer encapsulation layer, so that the impact force of the continuous falling rocks on the buffer seat is further reduced, and the buffer seat and the bottom structure of the buffer seat are effectively prevented from being damaged under great pressure.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.