418 results about "Response Frequency" patented technology

A method of detecting an RFID tag includes transmitting a bait RFID read signal at a bait power level and a simulated response signal at a simulated-response power level. A selected reader frequency is monitored for a selected detection time. A skimmer is determined to be present if a skimmer RFID read signal is detected during that time. If a skimmer is not determined to be present, multiple read signals are transmitted sequentially, each signal at a respective read power level. At least one of the read power levels is lower than the bait power level, at least one of the read power levels is lower than the simulated-response power level, and at least two of the read power levels are different from each other. A selected response frequency for a tag is monitored for a response from an RFID tag.

A system for synchronizing a second receive chain relative to a first receive chain in a multi-mode communication system. The system includes a first circuit that measures a first frequency associated with the first receive chain. A second circuit adjusts a second frequency associated with the second receive chain based on the first frequency and provides a desired second frequency to the second receive chain in response thereto. In a specific embodiment, the first circuit includes a first counter that receives a signal associated with an output of a first oscillator and provides a measurement of the first frequency in response thereto. The second circuit includes a frequency synthesizer for providing the desired second frequency in response to a frequency control or reference signal. Another circuit generates the control or reference signal based on a difference between the second frequency and the first frequency. A second counter receives a signal characterized by the second frequency and provides the second frequency in response thereto.

The invention discloses a high-sensitivity magnetic measurement device in an environment field based on disturbance compensation and a realization method thereof. In the method, the low-frequency disturbance compensation in an environment magnetic field is realized by a second feedback branch and a second magnetic flux locking loop, wherein the second feedback branch is composed of a second integrator, a low-pass filter, a second feedback resistor and a feedback coil; and the second magnetic flux locking loop is formed based on the second feedback branch. A super-magnetic conduction sensor established based on the method can realize the high-pass response frequency characteristics for the environment field and the low-pass response frequency characteristics for the circuit noise at the same time, ensures the suppression of the influence of environment field disturbance on SQUID (superconducting quantum interference device) magnetic measurement without influencing the weak signal measurement, and avoids the overflow phenomenon. Based on the super-magnetic conduction sensor, the method is suitable for the application environment in which the frequency of the magnetic field signal tobe measured is higher than the disturbance frequency band (DC-30Hz) of the environment field.

This invention relates to a piezoelectric ceramics driver circuit used for regulating optical fiber stress. It is composed of three parts: Part 1, the voltage amplifier stage circuit, comprising: a constant-current source circuit composed of triode Q1 and resistances R1, R2 and R3; a feedback comparator composed of R4, R5 and R6, and Q2, Q3; and a regulating tube Q4; Part 2, the power amplifier stage circuit, comprising: a selected high power and high voltage-resisting N-channel VMOS tube IRF830 substituted for the existing complementary symmetric circuit; and Part 3, the discharging 100p circuit, comprising: diodes D1, D2 and triode Q5 and a comparator. This invention has advantages of: simple structure, low energy consumption, small volume, stable working, safety, excellent dynamic response to non-regulated signals, quick response, wide response frequency range.

A mobile device for communicating with other devices using a frequency hopping wireless interface such as blue-tooth, sends a sequence of messages each on a different frequency, for finding other devices within range, and listens for a response during a subsequent response window, on one or more response frequencies. It receives information such as location information from the other devices without needing to set up a frequency hopping connection. The response window is long enough to receive more than one response. The overall time for short transactions such as a single request and response for device discovery, can be kept short. This in turn leads to low power consumption by mobile devices and low chance of interference between devices. An interval between sequences of the messages can be increased, thus lowering the total amount of packets broadcast.

The invention is suitable for the technical field of computers, and provides a system micro-servitization method and terminal equipment. The method comprises the following steps of: receiving a targetmicro-service access request sent by a consumer; searching a configuration file of a target micro-service in a central server according to the target micro-service access request; if the configuration file is searched, reading file parameters of the searched configuration file and accessing the target micro-service according to the read file parameters; if the target micro-service is not responded or wrongly responded, accessing a standby micro-service, and carrying out statistical analysis on a non-response or wrong response frequency of the target micro-service; and if the frequency exceedsa preset frequency threshold value, starting fuse protection. According to the method, target micro-services are replaced by accessed standby micro-services, so that the system complexity can be reduced, the coupling degree between different function modules can be decreased, and resource conflicts between application service system modules can be solved; and single services are modified withoutdeploying the whole system, so that the problem that the modification process of single services is tedious and complex is solved.

A hydrokinetic device having a water surface float tethered to a submerged buoyant housing is provided with mechanisms for optimizing the amount of wave energy extracted from the waves by the device. Based on wave conditions, the optimization functionalities include controlling the depth of the housing to produce wave shoaling or storm avoidance, as well as to perform continuous phase control and load control for the purpose of matching the response frequency of the device to the frequency of the incident waves.

The invention provides an acceleration sensor chip with a compound multiple-beam structure and a manufacturing method thereof. The acceleration sensor chip is characterized in that: four support beams and two sensitive beams support a hanging mass block, and the hanging mass block is suspended; the sensitive beam is provided with a plurality of voltage dependent resistors which are connected to form a semi-open-loop Wheatstone bridge, and an output terminal of the bridge is connected with pads of a chip. The manufacturing method of the chip comprises the following steps: thinning a hang mass block area silicon chip, and carrying out lithography and sputtering on a right side of the chip to form a metal lead wire and the pads; carrying out lithography at a back side of the silicon chip andwet method etching to form a movable structure composed of the sensitive beam, the support beam, and the hang mass block, bonding boron glass at a back side of a silicon chip substrate, and carrying out right side lithography and etching to form gap between a chip movable part and a silicon substrate to obtain the chip. When ensuring measure sensitivity of the sensor, response frequency of the acceleration sensor is raised, and performance of the sensor in dynamic acceleration measurement is enhanced. The manufacturing method of the chip has the characteristics of simplicity and high reliability, and realization of micromation and low cost is facilitated.

The present invention is a novel device, system, and method for simultaneous selection of filters and loop proportional gain for a closed loop system. According to an exemplary embodiment of the present invention, a method provides an automated selection of the portion of the controller known as the speed loop compensator. The method may operate on a frequency response function that represents the dynamic response from an actuation force (e.g. motor torque) to the sensor used for feedback of speed control (e.g. motor encoder angle). The frequency response function may be represented as a series of complex numbers each with a corresponding frequency value. The tuning method determines the combination of filter parameters that allows the loop proportional loop gain (K_p) to be maximized while meeting a specified set of criteria for stability margins. Methods for selecting integral gain and reference model are also presented.

Vibration is monitored in a dual rotor engine. A first total vibration of the engine is measured during operation. Relative phase of the two rotors is then clocked, and a second total vibration of the engine is then measured during operation. First and second total unbalances are then resolved at a common response frequency from the measured total vibrations. First and second rotor unbalances are then resolved for the corresponding rotors from the first and second total unbalances. In a further method, corresponding corrective balance weights may be determined for offsetting the resolved rotor unbalances.

A computation efficient polyphase channelization system enables one of many user FDMA signals to be channelized through multiple FFT response frequency bands forming an aggregate frequency band where K-point FFT channels are greater than the decimation factor M to produce FFT overlapped responses that have a smooth aggregate response without disjointed band gaps for reduced distortion using a clockwise commutator having M channels feeding M filter blocks, each of which having β polyphase filters, and having a ring switch to provide smooth filter responses that then drive β K-point FFTs to provide a β set of K vector FFT responses that are then combined in a post processing system for producing K channelized outputs.

The invention provides a motor control device, a compressor, an air conditioner and a program. In a motor control device applied in an air conditioner and the like, restriction on response frequency of the motor control device can be compensated and noise or vibration of a motor can be reduced. The motor control device is provided with an electric power conversion circuit and a control part. The electric power conversion circuit converts direct-current voltage into alternating-current voltage and drives a motor connected with a load device via the alternating-current voltage. The control part outputs a driving signal used for driving the electric power conversion circuit, presumes a rotation angle position (a shaft error delta theta c) of the motor and changes the duty ratio of the driving signal according to a presumed or preset load changing mode (differential torque presumed value delta tm^) and the rotation angle position (shaft error delta theta c).

The invention relates to a TMR (Triple Modular Redundancy) electronic compass utilizing a tunnel junction magneto-resistance effect. The TMR electronic compass comprises a TMR Wheatstone bridge sensor, a huge Hall effect magnetic sensor, a triaxial acceleration sensor chip, a sensor ASIC (Application Specific Integrated Circuit) chip and a micro central processing unit, wherein the TMR Wheatstone bridge sensor is used for measuring magnetic fields in an X direction and a Y direction; and a magnetic field in a Z direction can be measured by using the TMR Wheatstone bridge sensor and also be measured by using the huge Hall effect magnetic sensor, and in the invention, both the two design schemes are proposed. The TMR electronic compass has the following characteristics of wide dynamic range, high measuring precision, small packaging size, good temperature characteristic, high response frequency, low cost and strong anti-interference performance.

The invention discloses a multi-layer metamaterial unit structure and a preparation and regulation method of the multi-layer metamaterial unit structure. The multi-layer metamaterial unit structure comprises surface layer metal, an upper layer medium, middle layer metal, a lower layer medium and bottom layer metal sequentially from top to bottom, wherein the surface layer metal and the middle layer metal are composed of metal rings of different sizes, an overlapped area and a non-overlapped area exist between the two layers of metal rings at the same time, and the bottom layer metal of the structure is a continuous metal film. The performance of the multi-layer metamaterial can be regulated through the traditional methods of changing resonance metal graphs, metal and medium material parameters and the like, more importantly, and the response frequency and the frequency band of the metamaterial relative to incident electromagnetic waves are regulated by changing the diameter of the surface layer metal ring and the middle layer metal ring, the width of the overlapped area of the two rings and the width of the non-overlapped area of the two rings and the like. Compared with a traditional metamaterial structure, the multi-layer metamaterial unit structure has the advantages of having a wider response frequency band, more centralized medium loss, thinner element materials and the like.

The invention provides radio frequency identification device (RFID) label response frequency standard test system and method. The system comprises a standard test environment, a signal source emitting antenna, a receiving antenna, an RFID label to be tested, a signal source antenna bracket, a receiving antenna bracket, a label bracket, a signal source, a spectrum analyzer and a control computer. The method obtains a frequency domain range in which the RFID label to be tested can normally respond signals of a reader by analyzing response characteristics of an RFID label product in different frequency bands under the condition that input energies are kept same. By simulating the reader to read the signals of the RFID label, the frequency range of the RFID can be tested, and an RFID automatic test tool and a standard test method with simpleness, accuracy and efficiency are provided for a user.

The invention provides a device for generating sixteen-frequency multiplication millimeter waves in full light. An output end of an adjustable laser is connected with an input end of a first dual-parallel Mach-Zehnder modulator; an output end of a radio frequency signal source is connected with a radio frequency drive end of the first dual-parallel Mach-Zehnder modulator; a direct-current voltage source is connected with various sub-modulator bias ports and a primary bias port of the first dual-parallel Mach-Zehnder modulator; an output end of a second dual-parallel Mach-Zehnder modulator is connected with an input end of an erbium-doped optical fiber amplifier; an output end of the erbium-doped optical fiber amplifier is connected with an input end of a photoelectric detector; output optical signals of the erbium-doped optical fiber amplifier can be connected with an optical spectrum analyzer to be tested, and an output end of the photoelectric detector is connected with the optical spectrum analyzer to test. By the device for generating sixteen-frequency multiplication millimeter waves in full light, requirements for local oscillation frequency and response frequency of the modulator are greatly lowered, equipment is simple, practical operability is high, filters are omitted, and application in a WDM (wavelength division multiplex) system can be realized.

The invention relates to a response frequency benchmark test system and a response frequency benchmark test method for an electronic tag in a high-speed motion state. The system consists of a standard test environment, a signal source transmitting antenna, a signal source antenna bracket, a spectrum analyzer receiving antenna, a protective cover, a turntable, the electronic tag to be tested, a support table, a driving motor, a driving motor controller, a control computer, a signal source and a spectrum analyzer. In the method, a frequency domain range in which the electronic tag to be tested in the motion state can normally respond to the signal of a reader-writer is obtained by analyzing the response characteristics of an electronic tag product to be tested in the high-speed motion statein different test frequency bands; linear direction speed is simulated by instantaneous speed in the tangential direction of the turntable to realize the high-speed motion of the electronic tag to betested; the frequency response performance benchmark test of the tag in the motion state is realized by simulating the reader-writer to read the signal of the electronic tag to be tested; and a radiofrequency identification (RFID) automatic testing tool and a benchmark test method which are simple, clear and effective can be provided for users.

The invention discloses a knock response detecting device for tiny flaws on poultry eggs and a method thereof. The detecting device mainly comprises a detecting platform, a data acquisition device, an A/D converter and a computer, which are connected in turn. The method comprises the following steps: fixing a poultry egg on a platform base, and adopting a detection method of single-point excitation and three-point response; after the poultry egg is excited, triggering a response signal by a sensor signal, and collecting the response signal generated by a sensor through the data acquisition device; after conditioning and converting the signals through the A/D converter, carrying out fast Fourier transform to obtain a response frequency curve between 0 and 7,500Hz; after the response frequency is subjected to normalization treatment, taking highest amplitude to extract characteristic value and frequency characteristic value extracted by high-low amplitude in turn, and using principal component analysis and linear discriminant function analysis to carry out pattern recognition respectively. The method is not limited by environmental noise, eliminates interference of subjective factors during manual operation, and can accurately distinguish out the tiny flaws on the poultry eggs.

The present invention provides a high-speed wind tunnel high-angle-of-attack pitching dynamic stall test device. The device is driven by a motor, and the flywheel is driven to rotate through a belt drive wheel. The central axis of the flywheel drives a synchronous transmission gear set to transmit kinetic energy to the main drive. The four-link motion system consists of the main drive wheel, the connecting rod and the rotating window, which realizes the conversion of the flywheel rotation into the reciprocating oscillation of the rotating window, and then drives the fixed aircraft model to achieve pitching motion at a large angle of attack. The high-speed wind tunnel pitching dynamic stall test device with large angle of attack of the present invention overcomes the difficulties of strong vibration during operation of the existing high-speed wind tunnel, small space in the test section, low structural response frequency of the test section, and large environmental noise, etc., and can provide The dynamic aerodynamic test results of the aircraft model under the conditions of large angle of attack (up to 75°), large amplitude (‑15°~75°), and high frequency (0~6Hz) are used for aerodynamic optimization design, flight quality evaluation, and control rate design Provide key test basis.

A frequency translation filter includes a baseband filter circuit, a clock generator, and a switching circuit. The baseband filter circuit is operable to provide a baseband filter response. The clock generator is operable to generate multiple-phase clock signals at a desired frequency. The switching circuit is operable to frequency translate the baseband filter response of the baseband filter circuit to a high frequency filter response in accordance with the multiple-phase clock signals.

A power control device for regulating the power that a load consumes on the basis of the AC supply frequency. The system includes decision logic that responds to a frequency deviation to implement a power regulation strategy. The power regulation strategy includes a power compensation phase during which the electrical power that the load consumes is adjusted (reduced or increased) to balance the load on the grid. The power regulation strategy also includes a power restoration phase during which the power to the load is restored (either increased or decreased). The rate at which the power is adjusted during the power compensation phase is higher than the rate at which the power is restored during the power restoration phase.