49results about How to "Filter out high frequency noise" patented technology

A multiterminal solid electrolytic capacitor includes a capacitor element including a porous sintered body which includes a plurality of anode leads projecting from a surface of the porous sintered body and which is made from a valve metal powder, a dielectric oxide coating disposed on the porous sintered body, and a cathode including a solid electrolyte layer disposed on the dielectric oxide coating. The multiterminal solid electrolytic capacitor further includes a substrate which carries the capacitor element, which includes a plurality of anode-mounting terminals and a cathode-mounting terminal, and which is covered with resin. The anode leads are portions of a valve metal pattern which extends in the porous sintered body and which bends at a plurality of locations so as to have a desired path length.

The invention discloses a four-channel FlexRay bus communication module which comprises a FlexRay bus interface circuit, a microprocessor, as well as a debugging and testing interface circuit, a power supply circuit, a clock circuit, a reset circuit and an LED (Light-Emitting Diode) circuit which are respectively connected with the microprocessor, wherein the FlexRay bus interface circuit is divided into four branches, comprises a bus transceiver connected with a FlexRay bus and a communication controller for connecting the microprocessor with the bus transceiver, and is used for receiving external data information by virtue of the bus transceiver and transmitting the data information to the microprocessor by the action of the communication controller; and after being processed by the microprocessor, the data is transmitted to external equipment by virtue of the FlexRay bus interface circuit. According to the four-channel FlexRay bus communication module, the microprocessor MPC565 is adopted in the communication module, the four-channel FlexRay bus output capability is realized, and the FlexRay application range is expanded.

The invention discloses an out-of-focus projection three-dimensional measurement method of color binary fringes. The method involves three key parts including the color binary fringe coding principle, an out-of-focus projection system and the three-dimensional measurement principle. The out-of-focus projection three-dimensional measurement method of color binary fringes has the advantages that first, according to a traditional color sine fringe projection method, the color sine fringe gray level of projection of a traditional method projector is distributed between 0 and 255, the projection speed is limited within 120 frames/s, and the measurement speed is restricted; according to the method, because the projection color binary fringes only have the two gray levels of 0 and 255, the projection speed of a projector is greatly increased, and thus three-dimensional measurement speed is greatly increased; second, the three-step phase shift method is adopted, three-dimensional measurement can be achieved with only one set of color binary fringes, and the method has high three-dimensional measurement speed; third, the method has very high practical value in high-speed and high-precision three-dimensional measurement.

The invention provides an optical fiber distributed vibration sensing system based on an envelope detection circuit. The system modulates a divided first path of direct current laser into pulsed lightand sends the pulsed light to a sensing optical fiber; the sensing optical fiber carries out vibration detection based on pulsed light to generate Rayleigh scattering light transmitted backwards, then the second path of direct current laser and the Rayleigh scattering light are coupled to generate two paths of scattering light interference signals with the phase difference of 180 degrees; coherent detection is carried out on the two paths of scattering light interference signals; common-mode components are filtered out, and beat frequency electric signals are obtained. After passing through an envelope detection circuit consisting of full-wave rectification and low-pass filtering, the beat frequency electric signals are moved to a baseband from a carrier in a frequency domain, so that therequirement of the system on the sampling rate of an acquisition card is reduced; the envelope of the beat frequency electric signals is obtained in the time domain; digital demodulation in coherentdetection is avoided, and the burden of a processing device is reduced. The full-wave rectification circuit and coherent detection are combined, and the sensing distance is increased while the high signal-to-noise ratio of coherent detection is ensured.

The invention relates to a detection circuit for a magnet-hydro-dynamics (MHD) angular-rate sensor. The detection circuit is formed by function modules: a differential amplification module, a bandwidth expansion module and a band-pass filtering module and the like, and can control noise level of the sensor effectively, improve weak signal detection capability and expand work bandwidth. Besides, the detection circuit can achieve the effect of suppressing zero position bias and zero position temperature drift of the sensor under the condition of not adding a special zero position bias adjusting module and a zero position temperature drift compensation module.

The invention relates to a laser gyroscope strapdown inertia navigation system output conversion device based on a reusable IP core. Navigation information output by a laser gyroscope is input into a field programmable gate array (FGPA), information output by the FGPA is input into a navigation resolving module for resolution, wherein the FGPA consists of an output conversion module and an FIR IP core filtering module and is configured by a configuration circuit, and a power supply circuit supplies power for the FGPA. The device greatly simplifies the complexity and improves the flexibility of the configuration.

The invention discloses a train operation state monitoring system based on data projection mode conversion. The train operation state monitoring system comprises a data collecting module, a data processing module and a monitoring module. The data collecting module comprises a sensor for collecting data and a pre-filtering circuit. The data processing module comprises an arithmetic unit used for data calculation and a storage device used for data storage. The arithmetic unit processes the data according to the mode that multiple characteristic data are projected at the same time. The sensor transmits the collected data filtered by the pre-filtering circuit to the arithmetic unit, and the arithmetic unit processes the characteristic data in the mode of one-data-point projection and then transmits the data to the storage device and meanwhile transmits the data to the monitoring module. The train operation state monitoring system is simple in structure and data processing algorithm, free of calculation which is complex, large in time and resource consumption and expenditure and capable of meeting the requirements for real-time performance, instantaneity and timeliness of monitoring performed on safety and comfort of train operation.

The invention discloses a safety protection early warning system for a buried natural gas pipeline. The system comprises a central processing unit, an optical fiber sensing module, an environmental data acquisition module, a pipeline image processing module, a memory, a warning module, a power supply module, a wireless communication module and a monitoring terminal. According to the safety protection early warning system, the running state of the pipeline is detected in real time through the optical fiber sensing module; the environmental data around the pipeline is acquired through the environmental data acquisition module; when the leakage and sudden shock of natural gas occur, the optical fiber sensing module can be used for detecting the abnormal information of the pipeline and the position where the abnormal position of the pipeline is located; the abnormal point of the pipeline and the environmental data are marked on a pipeline image through the pipeline image processing module;meanwhile, the system is used for sending warning information and marked pipeline image information to the monitoring terminal, and thus, the on-line monitoring and safety early warning function of the pipeline are realized.

The invention discloses an IoT-based anti-interference electronic communication device comprising a casing, a positioner, a signal receiver and an anti-interference device, wherein the casing is provided therein with a processor; a heat dissipation fan is installed above the processor; a mounting plate is mounted above the positioned; the top of the casing is provided with a through hole; a fixingring is mounted on the upper end of the casing; a signal transmitter is mounted on the upper end of the mounting plate; and a stabilized voltage supply is disposed under the anti-interference device;a binding post is disposed outside the casing; a control panel is disposed above the binding post; and the casing is provided with an access door. The IoT-based anti-interference electronic communication device has the advantages of 1, convenient use, flexible operation, stable power supply, convenient detection and maintenance, and good practicability; 2, reinforcing the signal transmitter and the signal receiver to prevent loosening and falling off; 3, being resistant to interference, dissipating heat inside the device and extending the service life of the device.

A common mode thunderstrike killer circuit of a power supply comprises: a filter, the filter can be one or two difference mode inductors, or can be a common mode inductor of a conjugate iron core, so high frequency noises are filtered; a rectifier, and the rectifier can be full wave rectification or half wave rectification of any mode; an isolation transformer; a Y capacitance used for suppressing electromagnetic interference; and common mode strike killing member being impedance member, the common mode strike killing member can be constant value resistance, variable resistance, or thermistor, the common mode strike killing member is connected in series with the Y capacitance, and two ends of the common mode strike killing member connected in series with the Y capacitance are respectively connected with a primary side ground wire and a secondary side ground wire of the isolation transformer.

A novel analog interface digital control servo amplifier of the invention comprises a digital interface (1), an analog interface (2), a communication circuit (3), a conditioning circuit (4), a current sensor (5), a potentiometer (6), a DSP controller (7), an isolation circuit (8), a pre-driver circuit (9), and a power output circuit (10), wherein the DSP controller (7), the isolation circuit (8), the pre-driver circuit (9) and the power output circuit (10) are connected in series. The technical scheme of the invention is designed based on the fact that the servo control signals of small and medium-sized guided missiles are mainly analog control signals and the advantages in digital circuit control. Compared with a traditional control mode in which an analog circuit is built with an integrated operational amplifier circuit chip, the analog interface digital control servo amplifier has higher adaptability and good performance.

The invention discloses a control system of solar AC charging piles based on an HCS08 single-chip microcomputer. The control system uses the HCS08 single-chip microcomputer produced by Freescale as acontroller, and mainly consists of a power supply module, a drive module, a control guiding module, a communication module and a voltage and current detection module. The control system can make corresponding protection and alarm actions according to various conditions occurring in the charging process of electric vehicles. A low-voltage system adopts a two-circuit power supply mode, so that the control system can be powered not only by a power grid but also by a solar panel and a storage battery; and the power supply mode of the low-voltage system can be automatically switched according to the voltage of the storage battery. The AC charging piles in the standby state display the standby state by indicator lights instead of an LCD screen, thereby further reducing the standby power consumption of the AC charging piles. The control system optimizes PWM output and a detection circuit, and effectively reduces the communication error between the AC charging piles and vehicle-mounted chargers.

The invention discloses an Internet-of-Things signal transmission noise reduction system. The circuit comprises a band-pass filter circuit, a phase detection compensation circuit, an amplitude stabilization circuit and a frequency selection output circuit. Band-pass filtering is carried out on the received analog signal; the amplitude stabilization circuit utilizes the characteristic that the sumof parallel dynamic resistances of a diode D2 and a diode D3 changes along with the current of a feedback loop to adjust the amplification factor of the amplitude stabilization circuit, signal amplitudes are stabilized, the phase detection compensation circuit adopts operational amplifiers AR2 and AR3 to detect signal phase differences before and after band-pass filtering and takes amplitudes of the signal phase differences; the conduction states of the silicon controlled rectifier Q1 and the triode Q2 are controlled; the frequency selection output circuit utilizes parallel resonance of the adjustable transformer T1 and the capacitor C11 to achieve signal frequency selection, noise reduction processing is carried out on analog signals of the Internet of Things, and meanwhile the problem ofsignal distortion caused by nonlinear phase shift of an analog filter is solved.

The invention discloses a high-precision measuring system and method for the mechanical environment parameter of an aircraft in order to achieve high-precision measuring of the mechanical environment parameter of the aircraft. The method includes the steps that input signals are conditioned first, a Sigma Delta type AD converter is selected to be used for conducting oversampling and noise shaping on the conditioned signals, high-frequency noise can be filtered out by FIR digital filtering, at last, the data output rate requirement is guaranteed through an extracting technology, and high-precision measuring of the mechanical environment parameter of the aircraft is achieved.

The invention discloses a multi-category target recognition method and system for an unattended sensor system. The method comprises the following steps: S1, data preprocessing: framing original data collected by unattended sensor equipment; s2, signal feature extraction: extracting multiple segments of independent time domain features of the framed data at the same time; s3, convolutional neural network model training: taking the multiple segments of independent time domain features obtained in the step S2 as training samples, inputting the training samples into a convolutional neural network for training, and establishing a convolutional neural network model; and S4, signal recognition: recognizing the signal through the convolutional neural network model established in the step S3 to obtain an recognition result. The invention has the advantages of being easy and convenient to operate, small in calculation amount, high in recognition rate, capable of being applied to an embedded system and the like.

The invention discloses a zero-crossing protection circuit for a switching power supply, and includes a zero sequence detection module, a delay control module and a bidirectional silicon controlled rectifier connected on an alternating current loop. The zero sequence detection module includes a rectification circuit, a first triode and a phase inverter, an input end of the rectification circuit is connected on the alternating current loop, an output end is connected on a base electrode of the first triode, an emitting electrode of the first triode is connected on an input end of the phase inverter, the delay control module includes a 555 timing chip, an output end of the 555 timing chip is connected on a base electrode of a second triode, the first triode and the second triode form an independent electrical signal loop, a photoelectric coupler is connected in series between the first triode and the second triode, and an output end of the photoelectric coupler is connected on a control electrode of the bidirectional silicon controlled rectifier. The zero-crossing protection circuit for the switching power supply has the beneficial effect that a phenomenon that originally alternating current is directly connected and an electrical element is subjected to impact of alternating current instantaneous current can be prevented.

The invention relates to detection of low-frequency signal processing chip and low-frequency signal processing circuit. The detection of low-frequency signal processing chip comprises a VDD pin, a VCCpin, an OUT pin, a TXC pin, a VSS pin, an LS pin, an OPO pin and an INN pin; the VCC pin is electrically connected with the band-gap reference circuit through a low-dropout linear regulator LDO circuit; the INN pin is connected with the negative electrode of an operational amplifier OPA, the OPO pin is connected with the output end of the operational amplifier OPA, a fixed gain amplifier AMP is connected between the OPO pin and the output end of the operational amplifier OPA, the output of the fixed gain amplifier AMP is connected to the positive electrode of a comparator COMP1 and the negative electrode of a comparator COMP2. The chip integration level is high, the peripheral circuit is simple, the peripheral components are small, the miniaturization is convenient, the system is low in cost, the anti-interference capability is strong, the error is not triggered, and the installation and debugging are convenient.

The invention provides a head movement tracking method and system. The method comprises the following steps: acquiring actually measured angular velocity and acceleration information of head movement;detecting face information, and obtaining actually measured posture and position information of the head according to the face information; and fusing the actually measured angular velocity and acceleration information of the head with the actually measured attitude and position information to obtain optimized head attitude and position information. According to the method, auxiliary correction of actually-measured attitude and position information by actually-measured angular velocity and acceleration information can be realized; therefore, optimized head posture and position information areobtained; compared with the actual measurement attitude and position information of the head, the optimized attitude and position information can obtain a higher frame rate, and inherent high-frequency noise of the actual measurement attitude and position information is filtered out, so that the phenomena of scene lag, jumping and the like of head motion tracking are avoided, and the accuracy andstability of head motion tracking are improved.