39results about How to "Solve signal distortion" patented technology

The invention discloses a structure of a photoelectric composite flame-proof high-voltage cable and a preparation method thereof, belonging to the filed of cables. The structure comprises three high-voltage power line cores, a control cable core, an earthing cable core, an optical cable, three reinforcing cores, a reinforcing layer, an inner sheath and an outer sheath which are stranded into a cable according to cable structure design requirements. The cable provided by the invention has the advantages that the voltage-level of the cable is improved, the optical signal transmission can be carried out, the signal distortion problem of the cable in laying space, signal transmission and conversion is solved, the difficulty that the cable is easy to fracture in cable laying in a complex state is solved, further the service life of the cable is prolonged, and the cable provided by the invention also has the advantages of simple structure and simple process, and is easy to popularize.

The invention relates to a method for applying radio feedback technique in power amplifier, while prior radio power amplifier widely used in wireless communication emitter can resolve signal aberration problem effectively, while pre-aberration technique and passive-feedback technique can not effectively resolve the problem. The invention comprises a casing and a circuit board, wherein one side of the casing is provided with a radio output, a radio input, a detection input, and a power input, the bottom of the casing is provided with a plurality of insulation chambers with an internal circuit board, the feedback amplifier mainly comprises two amplifiers (main amplifier and error amplifier), a directional coupler, a delay line, and a loop control network, while the directional coupler distributes and combines powers, the delay line confirms the feedback amplifier works stably in wide band, and the loop control network confirms the correct counteraction between signal and aberration. The invention has stable property, which can effectively resolve signal aberration, with side application, flexible operation or the like.

The invention discloses a system for testing turn-to-turn short circuit of a rotor winding of an automobile turbine generator, which consists of an upper structure and a lower structure in mutual communication connection through Ethernet. The lower structure comprises a magnetic flux detector mounted in a motor and an embedded PC104 data acquisition unit located near a generator, data acquisition is carried out on stimulation signals output by the magnetic flux detector through the data acquisition unit, and the acquired digital signals are transmitted to an upper industrial personal computer through Ethernet; the upper structure of the system comprises an industrial personal computer, a display and a printer, the industrial personal computer controls the data acquisition unit remotely through Ethernet to complete data acquisition and transmission, then analyzes and diagnoses received data, and displays and prints the diagnosis result and acquired waveforms. In the invention, advanced Ethernet communication and embedded PC technology are adopted to realize digital signal-based remote transmission, thus greatly improving the fault diagnosis accuracy and working reliability of the test system on turn-to-turn short circuit of the rotor winding.

The present invention is related to a capacitive touch device and excitation signal generating circuit and method thereof. The excitation signal generating circuit is connected to multiple sensing traces of the capacitive touch device, and has a storage unit storing at least one set of digital data. Each set of digital data is corresponding to a frequency. The PDM signal generator reads the set of digital data and converts the read set of digital data to a PDM signal according to the frequency of the read set of digital data. The PDM signal is recovered to an analog excitation signal since the PDM signal passes through a current transmission path, which is equivalent to a low pass filter. Therefore, the present invention can decrease a distortion of the sensing signal to increase accuracy of the sensing signal and to save power.

The invention provides a liquid crystal display panel and a method of manufacturing and restoring the same. The liquid crystal display panel comprises vertically and horizontally staggered grids and data lines, a horizontal common electrode line, a grating insulating layer on the grating, a metal-oxide semiconductor layer on the grating insulating layer, an etching barrier layer on the metal-oxide semiconductor layer, a source electrode, a drain electrode, a JAS layer, a second metal connecting line which is connected with a longitudinal common electrode, and a pixel electrode, wherein the horizontal common electrode line and the grading are formed at the same time; the source electrode and the drain electrode are electrically connected with the metal-oxide semiconductor layer; and the JAS layer covers the source electrode, the drain electrode, the second metal connecting line and a data line. The liquid crystal display panel and the method of manufacturing and restoring the same can solve the problem that a current pixel is small in the aperture ratio and is distorted, thus reducing the time of signal transmission, avoiding distortion caused by signal delay, and at the same time can reduce the line layout surrounding a panel and save the space of the panel and the production cost.

The invention provides an image processing device, which comprises a virtual differential analog front end circuit. The front end circuit is used for receiving at least one image analog signal, and generates at least one digital signal. The virtual differential analog front end circuit comprises at least one conversion circuit, each conversion circuit comprises a clamper, an input buffer and an analog-to-digital converter, wherein when the number of the conversion circuits is larger than 1, various analog-to-digital converters receive the same comparative voltage.

The invention provides an undistorted signal processing method based on a superposed window. The undistorted signal processing method comprises the following steps: step 1, dividing a to-be-processeddata signal into a first path of data signal and a second path of data signal; 2, windowing the first path of data signal by adopting an original window function; 3, obtaining a complementary window function according to the original window function and a preset overlapping scale factor; 4, respectively carrying out delay processing on the complementary window function and the second path of datasignal; 5, windowing the second path of data signal after delay processing by adopting the complementary window function after delay processing; and 6, adding the windowed first path of data signal and second path of data signal to obtain an undistorted signal. The invention further provides a storage medium and a system. According to the invention, under the condition that a certain overlapping ratio is guaranteed, the calculated amount is reduced, and meanwhile the distortion problem of data signals in the windowing process is avoided.

The invention provides an optical receiving chip. The optical receiving chip comprises an input coupling unit, a polarization rotation unit, a photoelectric detection unit, a first transmission waveguide and a second transmission waveguide; an optical signal has input TE polarized light and/or input TM polarized light; the polarization rotation unit can rotate the input TE polarized light by 90 degrees to convert the input TE polarized light into output TM polarized light, and can rotate the input TM polarized light by 90 degrees to convert the input TM polarized light into output TE polarizedlight; the first transmission waveguide is used for transmitting the input TE polarized light and/or the input TM polarized light from the input coupling unit to the polarization rotation unit; the second transmission waveguide is used for transmitting the output TE polarized light and/or the output TM polarized light from the polarization rotation unit to the photoelectric detection unit; and the total length of the first transmission waveguide is equal to the total length of the second transmission waveguide. The optical receiving chip provided by the invention can realize polarization-independent optical signal receiving.

The invention relates to the technical field of electrocardio signal processing, and discloses an electrocardio artifact signal removing method. The method comprises the following steps: S1, collecting an original electrocardio signal, and identifying feature points on the original electrocardio signal; S2, performing fitting according to the feature points to obtain an artifact signal, and subtracting the artifact signal from the original electrocardiosignal to obtain an artifact-removed electrocardiosignal; S3, judging whether the quality parameter of the electrocardiosignal subjected to artifact removal meets a preset condition or not, if so, turning to S4, otherwise, correcting the feature points, and then turning to S2; S4, taking the original electrocardiosignal as an input, taking the electrocardiosignal after artifact removal as a label, and sending the label to a neural network for training to obtain an artifact removal model; and S5, performing artifact removal on the to-be-processed electrocardiosignal according to the artifact removal model. The method has the technical effects that signal distortion cannot be caused after artifacts are removed, and the artifact removing precision is high.

The invention discloses a visible light communication system. The visible light communication system comprises an LED illumination device, a driving circuit and a plurality of transmission branches, wherein the driving circuit is used for providing a driving signal to the LED illumination device; the driving circuit comprises a plurality of driving units; the plurality of transmission branches are connected with the driving circuit and the LED illumination device; the transmission branches correspond to the driving units one by one; the phase difference between at least two phases in driving signals output by each driving unit is (0, 2pi) and does not comprise an endpoint value, namely the driving signals output by each driving unit are completely different so that the phenomenon that current in all the transmission branches reaches the peak value at the same time is avoided when the driving signals are provided to the LED illumination device by using the driving circuit, and furthermore, the phenomenon that the driving current of the LED illumination device is too great or too small is effectively avoided; a signal distortion phenomenon in a process of realizing communication by using an LED is solved.

The invention aims at providing a device for monitoring coal position of a coal mill through a multiquadrant noise method. The device comprises the coal mill, 4N*(N ranges from 1 to 4) piezoelectric ceramic pick-ups mounted at the outside of a steel barrel of the coal mill, and an external processor, wherein the peripheral sidewall of the steel barrel of the coal mill is quartered into four quadrant areas by treating an axis of the steel barrel of the coal mill as the center; N*(N ranges from 1 to 4) piezoelectric ceramic pick-ups are uniformly adhered in each quadrant area; an inclinometer is mounted on each piezoelectric ceramic pick-up; the external processor is connected with each piezoelectric ceramic pick-up and used for reading and recording an electric signal output by each piezoelectric ceramic pick-up in order to determine the coal position of the coal mill.

The invention discloses an intelligent service management system based on cloud computing. One path of the carrier signal receiving circuit accesses a time reference carrier signal when the cloud server normally receives the carrier signal through the RC frequency selection circuit; the other path generates a reference carrier frequency signal through an oscillation circuit; frequency fine tuningis carried out through control of a tuning circuit; resonance with a to-be-measured carrier frequency signal received by a cloud server in real time is realized; the offset calculation circuit calculates a frequency difference 1 between a reference carrier signal and a to-be-measured carrier signal through the first frequency difference circuit. The frequency difference 1 higher than 1000kHz is added to the second frequency difference circuit; a frequency difference 2 between the reference carrier signal and the frequency difference 1 is calculated and feeds bak to the first frequency difference circuit so as to reduce the the frequency difference 1; and the frequency voltage conversion circuit receives the frequency difference 1 through the low-pass filter, converts the frequency difference 1 into voltage, and adds the voltage as control voltage to a carrier modulation circuit of the data terminal transmitter to adjust a carrier signal transmitted by the transmitter.

The invention provides a network connection method based on visible light communication. The method comprises the following steps: arranging an LED lamp for visible light communication indoors; arranging the wireless communication equipment in a coverage area of the visible light communication network and enabling the wireless communication equipment to be connected with the visible light communication network, so that the wireless communication equipment is connected with a plurality of network connection lines; and selecting the network connection line with the shortest optical path from the plurality of network connection lines as a communication line, and shielding other network connection lines. The wireless communication equipment selects one network connection line with the shortest optical path for communication and shields other network connection lines, so that the wireless communication equipment can only receive one network connection line, and errors such as messy codes caused by receiving a plurality of network connection lines are avoided; and meanwhile, a connected line cannot be reflected on objects such as a wall surface, so that not only is the transmission speed ensured, but also the signal strength and accuracy are ensured. The problem of signal distortion or error caused by a multipath effect of existing visible light communication is solved.

The invention provides a wavelet packet decomposition valve inner leakage signal noise reduction method. The method comprises the steps: acquiring a pipeline valve inner leakage signal containing noise; carrying out wavelet packet decomposition on the pipeline valve inner leakage signal containing the noise to obtain a plurality of wavelet packet coefficients; establishing different wavelet packet coefficient threshold models according to the parity of wavelet packet decomposition layers, wherein specifically, when the number j of decomposition layers is an odd number and when the number j of decomposition layers is an even number, T is a wavelet packet coefficient set threshold, sigma n is the standard deviation of noise, and N is the number of signal samples; reconstructing the valve inner leakage signal according to the thresholded wavelet packet coefficient. The invention further provides a wavelet packet decomposition valve inner leakage signal noise reduction device and system, the stability of valve inner leakage signal noise reduction is effectively improved, and the accuracy and reliability of valve inner leakage signal detection are improved.