131results about How to "Signal distortion is small" patented technology

The invention provides a refrigeration-type coaxial packaging light-emitting tube core, which comprises a transistor outline (TO) tube shell, a refrigerator, a heat sink, a laser carrier and a sealing tube cap, wherein the TO tube shell comprises a tube shell base. At least seven pins are arranged around the tube shell base; the pins comprise a radio frequency (RF) signal pin, and the laser carrier with a microstrip line is arranged on the RF signal pin; the radiating surface of the refrigerator and the surface of the tube shell base are fixed in the manner of sticking; the refrigeration surface of the refrigerator and the surface of the heat sink are fixed in the manner of sticking; the heat sink and the surface of the laser carrier with a matched resistor and the microstrip line are fixed in the manner of sticking; an electric absorption modulation laser chip, a backlight detector, a thermistor and a power filter capacitor are fixedly arranged on the surface of the laser carrier in the manner of sticking; one end of the microstrip line of the laser carrier is connected with the anode of an electric absorption modulator; and the other end of the microstrip line of the laser carrier is connected with a microstrip line on the RF signal pin through a conductor wire. When installation is performed, the emitted light outlet optical axis of the laser chip and the optical axis (OA) of the central axis of the TO tube shell are coaxial. Optical steering elements are not needed, the process is simple, and the signal distortion can be reduced.

An externally arranged ultrahigh frequency partial discharge detection sensor comprises a metal shielding outer shell, a microstrip antenna and a coaxial cable connector. The metal shielding outer shell is a box body with an opening at the bottom, and the lower bottom edge of the long side wall is arc-shaped. The microstrip antenna is arranged in the metal shielding outer shell and is a rectangular paster antenna. Long edges of a conductor paster are respectively provided with an inward concave arc notch, arc notches are symmetrically arranged using a geometric center of the conductor paster as a symcenter, the microstrip antenna is arranged in the metal shielding outer shell through a dielectric substrate, and an earth plate of the microstrip antenna is a metal shielding outer shell. An integrated circuit board is arranged in the metal shielding outer shell. A low noise amplifying circuit connected with the microstrip antenna, a detector circuit, an amplifying circuit which outputs signals through the coaxial cable connector, and a power supply circuit are arranged on the integrated circuit board. The externally arranged ultrahigh frequency partial discharge detection sensor integrates the microstrip antenna, the integrated circuit board and the shielding outer shell, and is high in sensitivity, small in signal distortion, good in signal-to-noise ratio characteristic, and capable of keeping characteristic information of partial discharge signals to the maximum limit.

The invention provides a high-voltage direct current broadband domain corona current measurement system. The high-voltage direct current broadband domain corona current measurement system comprises a sampling resistance sensor, an extra-high voltage local measurement unit, an optical fiber transmission unit, a safe location measurement unit and an upper computer. The sampling resistance sensor samples the corona current signals of a high-voltage direct current, and converts the corona current signals to voltage signals. The extra-high voltage local measurement unit collects the voltage signals, and optical signals are obtained through photovoltaic conversion. The optical signals are transmitted to the safe location measurement unit through the optical fiber transmission unit. The safe location measurement unit converts the optical signals to the voltage signals. The upper computer processes, stores and displays the voltage signals. The high-voltage direct current broadband domain corona current measurement system has the advantages of being wide in measured frequency range, strong in capability of resisting electromagnetic interference and the like and can have a long-term and stable operation under the environment of extra-high voltage direct current and under the condition of all kinds of bad natural environment conditions, and provides effective technical means for further research of high voltage direct current corona characteristics.

The sending end buffers the waveform signals processed by subband filter banks; cutting off the streaking signals at the beginning and end of the buffer waveform to get the truncated signals; making the looping stack from beginning to end of the truncated signals to get the transmission signals of time domain looping from beginning to end.

The invention discloses a photomultiplier of electrostatic focusing micro-channel plates. The photomultiplier comprises a photocathode, an electron multiplier, an anode, a focusing electrode, a power supply electrode and a supporting post for supporting the focusing electrode, the electron multiplier and the anode, the focusing electrode, the electron multiplier and the anode are arranged in a glass vacuum container, and a signal lead of the anode and the power supply electrode penetrate through the glass vacuum container to be connected with an external circuit. The photomultiplier is characterized in that the centers of the focusing electrode, the electron multiplier and the anode are coaxial, the electron multiplier comprises the two pairs of micro-channel plates arranged in parallel, and certain gaps are reserved between the micro-channel plates. Compared with the prior art, all stages of voltages of the micro-channel plates are independently adjusted, and high gains and good photoelectron spectra are achieved.

The invention provides a grid voltage bootstrapped switch circuit. The grid voltage bootstrapped switch circuit comprises a grid voltage bootstrapped loop circuit (10) and an NMOS (N-Metal Oxide Semiconductor) switching tube (MN6), wherein the grid voltage bootstrapped loop circuit (10) is used for generating grid control voltage under the control of a clock signal, and the grid control voltage can be influenced by an input analog signal; and a grid end of the NMOS switching tube (MN6) is connected with the grid voltage bootstrapped circuit (10), a leakage end of the NMOS switching tube (MN6) is connected to an analog signal input end, a source end of the NMOS switching tube (MN6) is connected to a discrete signal output end, and the NMOS switching tube (MN6) is used for keeping the grid source voltage difference unchanged under the control of the grid control voltage, sampling the analog signal input by the analog signal input end into a discrete signal and outputting the discrete signal from the discrete signal output end. According to the grid voltage bootstrapped switch circuit provided by the invention, the nonlinearity of switching on a resistor by a switch is removed to the maximum, the signal distortion is reduced, and the circuit accuracy is increased.

An array substrate for liquid crystal display devices includes first and second gate lines spaced apart from each other, a common line between the first and second gate lines parallel to the first and second gate lines, a data line crossing the first and second gate lines to define first and second pixel regions with respect to the common line, a first thin film transistor at a crossing portion of the first gate line and the data line, a second thin film transistor at a crossing portion of the second gate line and the data line, a first pixel electrode connected to the first thin film transistor in the first pixel region, and a second pixel electrode connected to the second thin film transistor in the second pixel region, wherein the first and second pixel electrodes have a symmetric shape with respect to the common line.

The present invention includes 1, searching waveform in signal most similar with signal end point waveform and used as end point waveform estimation; 2, using outboard waveform in said most similar waveform as outer end point signal data estimation and continuing said waveform to outer signal end point. Said invention has advantages of high continuation data precision, eliminating end effect to both of circulation smoothness signal periodic signal and non-circulation smoothness signal.

The invention provides a refrigeration coaxial light-emitting pipe core, which comprises a TO (transmission optical) pipe shell and a sealing pipe cap with a light window. The TO pipe shell comprises a pipe shell base and a laser mounting sleeve connected with the pipe shell base in a sealing way, the pipe shell base is provided with a plurality of pins electrically connected with an external system, the inner sidewall of the laser mounting sleeve is provided with a mounting platform, a heat dissipating surface of a refrigerator is arranged on the surface of the mounting platform, a refrigeration surface of the refrigerator is used for the arrangement of a laser carrier, the surface of the laser is provided with an electro-absorption modulated n laser chip, a thermistor and a backlight detector, and the light-emitting optical axis of the laser chip is arranged coaxial with the central axis OA of the TO pipe shell and is output by the light window of the sealing pipe cap. Heat dissipation of the whole device is achieved by the laser mounting sleeve instead of the base of the traditional TO pipe shell, and the problem of laser cooling is solved. The pipe core with the structure is coupled with an external optical element of the TO pipe shell to manufacture the light-emitting component with the appearance complying with multi-source agreements XMD (Xilinx microprocessor debugger) for small devices of 10 Gb / s.

A computed tomography apparatus includes a two-dimensional data acquisition system which acquires projection data of a radiographic region within a subject using a multirow detector, and a hybrid image reconstruction system which reconstructs an image of the radiographic region on the basis of both the projection data and additional data calculated from the projection data. The hybrid image reconstruction system functionally includes a unit for calculating an additional intermediate beam data set, a unit for executing hybrid reconstruction of an oblique section, and a unit for generating a parallel section group. Owing to the construction, there are provided an image reconstruction method which is practicable and which affords a high precision, and a three-dimensional CT system which has the functions of the image reconstruction method.

The invention discloses a sampling hold circuit applied to an analogue-to-digital converter, which comprises a sampling switch bootstrap circuit (10), a sampling network (20) and a source follower (30). The output end of the sampling switch bootstrap circuit (10) is connected with the input end of the sampling network (20); the output end of the sampling network (20) is connected with the input end of the source follower (30); and a thirteenth node (13) of the source follower (30) is the output Vout of the sampling hold circuit. Compared with the conventional sampling hold circuit, the sampling hold circuit applied to the analogue-to-digital converter eliminates the nonlinearity of a switch conducting resistance, reduces signal distortion and improves the accuracy of the circuit due to theadoption of the bootstrap circuit.

The invention discloses a navigation anti-interference algorithm combining threshold processing and a space-frequency adaptive algorithm, and belongs to the field of satellite navigation communication. The algorithm enables a threshold processing algorithm and the space-frequency adaptive algorithm to be combined together, carries out the threshold preprocessing of a signal converted into a frequency domain at first, and then carries out the space-frequency adaptive processing, thereby effectively improves the capability of resisting narrow-band strong interference of an anti-interference system. Meanwhile, the algorithm employs a method of two-channel data stack windowing for the anti-interference processing of the signal during the space-frequency adaptive processing, effectively reducing the impact on spectrum leakage from a conventional space-frequency adaptive algorithm, and improving the performance of a system.

The invention discloses an automatic gain control device and an audio control system comprising the same. The automatic gain control device comprises an extraction unit, a first addition unit, a moving average filter, a locking circuit and an accumulator, wherein the extraction unit is used for carrying out power extraction on intermediate frequency signals, and acquiring a signal instantaneous power value; the first addition unit is used for subtracting the signal instantaneous power value from a target power value, and acquiring a signal instantaneous power difference value; the moving average filter is used for acquiring an average power difference value according to the signal instantaneous power difference value; the locking circuit is used for generating locking signals according to the average power difference value, and the locking signals are used for controlling the accumulator to be in a locking or unlocking state; and the accumulator is used for accumulating the average power difference value in the unlocking state, and outputting automatic gain control signals. The fidelity of steady signals is improved by additionally arranging the locking circuit to control the operation of the accumulator.

The embodiment of the invention discloses a grid driving circuit, a display panel and a display device. The grid driving circuit is used on the display panel and characterized by comprising a signal generating circuit and at least one signal, wherein the signal generating circuit is used for generating a grid line driving signal for driving a grid line positioned in the display panel, and the at least one signal enables the driving signal to have cutting angle waveform. The grid driving circuit, the display panel and the display device provide a scheme for weakening the negative influence caused by RC delay from the perspective of a signal source.

The present invention relates to a piezoelectric vibrator, in which a high sound pressure can be achieved over the whole sound range, along with a stereo sound effect, and a simplified piezoelectric panel speaker using the piezoelectric vibrator. The piezoelectric vibrator comprises an elastic member, a multi-acting vibrator for converting an electrical signal into mechanical vibration and formed of a plurality of piezoelectric members, and a vibration transmission elastic member attached to an elastic member of the multi-acting vibrator and for transmitting the mechanical vibration to the outside. Each piezoelectric member is attached to one face of the elastic member and having an electrode attached to both faces thereof. An electrical signal of different frequency band is applied independently to each of the plural piezoelectric members constituting the multi-acting vibrator. In addition, the piezoelectric vibrator has a single layered or multi-layered structure. In case of the multi-layered structure, layers have the same area and shape or different areas and shapes.

The present invention is provided with an audio signal amplifier circuit and an electrnic apparatus having same. The audio signal amplifier circuit includes a first, a second and a third differential amplifier which operate at a source voltage with respect to a reference voltage or a voltage between these; an output stage having a first and a second transistor driven complimentarily; a first resistor connected to an input terminal; a second resistor connected to an output of the first differential amplifier circuit; and a first and a second feed back resistor connected to an output terminal of the output stage circuit.

The invention provides a collecting and displaying method of high-definition video image, which is based on video collecting and displaying device with general HDMI interface. The invention can use high-definition digit camera to obtain initial high-definition video data, process video image treatment on the initial high-definition video data transmitted by a high-definition video collecting card, to be adjusted into pointed high-definition resolution, to be output to a high-definition video display device with HDMI interface to be displayed. The inventive method can collect and display high-definition video signal, as local display, cascade display, and remote display, even the method can obtain better device versatility, high video quality, better real-time property, and strong expansion or the like.

The invention relates to a broadband receiver with a phase-locked loop local oscillation circuit, which relates to the field of electronic communication and aims at solving the technical problems that the conventional receivers can not satisfy the rigorous index requirements of the industry in the aspects of linearity, dynamic range, sensitivity, anti-interference ability, adaptability and the like. The broadband receiver with the phase-locked loop local oscillation circuit comprises a power supply, a local oscillation module, a receiving channel and a numerical control part; and the power supply, the local oscillation module, the receiving channel and the numerical control part are respectively arranged in an independent cavity body. The invention is suitable for the design of the wideband receivers.

The invention discloses a rotation machinery torsional vibration signal collection analysis method, comprising steps of installing a marking device at a rotation shaft measurement cross section of a device to be tested, installing a matching detection device, removing low frequency interference in an outputted pulse signal, converting the pulse signal to a standard TTL pulse signal, utilizing a high frequency counter to perform signal collection to obtain a series counting value, using an obtained series counting value to solve a series transient angular speed value, solving the series uniform angle collection transient torsional angle speed value, solving a series equal-time-interval sampling transient torsional angle speed value, solving the real torsional angle speed signal, performing integral transformation on a real torsional angle speed signal after the trend item is eliminated to obtain a torsional vibration angular displacement signal. The invention maximally improves the accuracy and reliability of rotation machinery torsional vibration signal analysis and has high reliability and high measurement accuracy.

The embodiment of the invention discloses a carrier tracking loop and a receiver. The carrier tracking loop comprises a first feedback loop module and a second feedback loop module; the first feedback loop module is used for conducting frequency eliminating processing on first data by adopting received first frequency estimation values sent by the second feedback loop module; the second feedback loop module is used for conducting frequency adjustment on third data by adopting second frequency estimation values and demodulating the data subjected to frequency adjustment to obtain bit data. According to the carrier tracking loop, a double-feedback loop mechanism is adopted, the first feedback loop module conducts coarse frequency offset eliminating by adopting the first frequency estimation values and pulls signal Doppler frequency offset to be within the bandwidth range of a matched filter, and signal distortion caused by filtering is reduced; the second feedback loop module conducts precise carrier tracking by adopting the second frequency estimation values, so that a signal frequency spectrum can be stabilized within the main lobe range of the matched filter at every moment.

The invention relates to a seismic detector for a pull-type crawler, which comprises a shell and a grounding end connected with the front end of the shell and arranged outside a rubber belt track; the shell is arranged at the inside of the rubber belt track, and the grounding end and the shell are connected to be fixed on the rubber belt track; a detector core is rigidly fixed in the inner cavity of the shell and is closed by a thread end cover arranged at the tail end of the detector core; the bottom end of the detector core is provided with a signal lead; during seismic measuring, as the detector core body and the shell package are rigidly fixed and the shell of the detector and the ground form an absolute mass body, the detector can better measure the particle vibration of the earth surface. The seismic detector is suitable for the rigid packaging requirements between the shell and all vibration-type and other mechanical sensor core bodies. A contact, which is coupled with the ground, of the detector with the minitype structure is connected onto the mobile rubber belt track by threads, so the seismic detector is stable in work, reliable, efficient, suitable for various geological surfaces to carry out geophysical prospecting, low in manufacturing cost, simple and conveniently connected with a lower computer.

The invention discloses a switched capacitor amplifier circuit with clamping, comprising: a switched capacitor amplifier including an operational amplifier (opamp). A switching circuit comprises a first switch connected across inputs of the opamp. A second switch is connected across outputs of the opamp. An overdrive detect circuit communicates with the first and second switches and selectively shorts the inputs and the outputs of the opamp when the input voltage is greater than a first predetermined overdrive voltage or when the input voltage is less than a second predetermined overdrive voltage.

The invention discloses an OFDM peak-to-average ratio suppression method based on an alternating direction multiplier method for solving the problem that the existing optimization method for reducingthe OFDM peak-to-average ratio has high computational complexity. The implementation scheme comprises: taking frequency domain OFDM signal data carrier interference as an objective function, taking the peak-to-average ratio and the free carrier power as constraint conditions, establishing a non-convex optimization model; using the alternating direction multiplier ADMM to participate in the optimization process, and seeking the optimal solution, wherein the optimization process consists of two schemes, the ADMM method is directly used for solving in scheme 1, and a KKT point of an optimizationmodel can be guaranteed to be converged in the case of convergence. In the scheme 2, the optimization model is relaxed to obtain a relaxation model to guarantee the convergence, and the KKT point of the optimization model is infinitely approached in the case that the parameters are properly selected. Compared with the existing peak-to-average ratio suppression method, the OFDM peak-to-average ratio suppression method has the advantages of being able to obtain a smaller and more constant peak-to-average ratio, improving the system error rate performance and reducing the computational complexity, and the OFDM peak-to-average ratio suppression method is applied to the technical field of communication to improve the transmission quality of the communication system quality.

The invention relates to a novel self-filtering narrow spectral response organic light detector. The organic light detector sequentially comprises a substrate, a positive electrode, a P-type layer, anN-type layer and a negative electrode, the P-type layer can be further divided into a single-layer P-type layer structure and a multi-layer P-type layer structure, and in the single-layer P-type layer structure, the band gap of the P-type layer material is wider than that of the N-type layer material; in the multi-layer P-type layer structure, the band gap of at least one P-type layer material inthe P-type layer materials which are not in direct contact with the N-type layer is wider than that of the N-type layer material and / or the P-type layer material which is in direct contact with the N-type layer, and a buffer layer can be added between the positive electrode and the P-type layer and / or between the N-type layer and the negative electrode. According to the invention, a novel devicestructure and a simple preparation method are adopted, and the free selection of a detection spectrum waveband and the free adjustment of the half-peak width of a detection spectrum are achieved without a band-pass optical filter.

The invention relates to a noise removing method for contact net insulator leaked currents. According to the method, an extreme value prolongation method is used for reducing end point effect, signals are resolved through an improved EMD method so as to obtain components of frequency from high to low, a power ratio method is used to remove false components, noise in high-frequency ingredients in the remaining components is removed in a small wave threshold mode, and high frequency signals after noise removing and the remaining components are reconstructed, so that signals after noise removing can be obtained. The EMD method has adaptivity compared with small wave conversion. The problem of base function selection does not need considering. Compared with the EMD method, the improved EMD threshold method reduces effect of end point effect and false components on noise removing effect. Further, threshold value noise removing is conducted on high-frequency components, useful signals can be maintained to a largest degree, and signal distortion is reduced.

The invention discloses an orthogonal frequency division multiple access (OFDMA) system signal processing method and a device to lower signal distortion of an OFDMA system. The OPDMA system signal processing method includes: a base station device sends reference signals to a terminal device and receives the present downlink subchannel quality parameters determined and responded by reference signals sent by the terminal device according to the base station device; targeting to each subcarrier, adjusting error vector magnitude (EVM) repair parameters used by a pre-set EVM repair algorithm corresponding to the subcarrier according to feedback channel quality parameters of each subchannel from the terminal device; based on the adjusted EVM repair parameters of the subcarrier, using the pre-set EVM repair algorithm to conduct the EVM repair to a frequency domain OFDMA signal on the subcarrier. The frequency domain OFDMA signal on the subcarrier is obtained from a signal distorted frequency domain OFDMA signal changing from time domain to frequency domain.

The invention discloses an electronic system, a radio frequency power amplifier and a bias voltage point dynamic regulation method thereof. The radio frequency power amplifier comprises a bias circuit, an output stage circuit and a dynamic bias voltage control circuit. The bias circuit receives first system voltage and provides working voltage according to the first system voltage. The output stage circuit receives the working voltage so as to work at an operation bias voltage point. The dynamic bias voltage control circuit detects a radio frequency input signal and outputs offset voltage to the bias circuit according to change of the radio frequency input signal and is in an open loop mode. When input power of the radio frequency input signal is improved and accordingly the operation bias voltage point shifts and the working voltage is reduced, the bias circuit increases the working voltage according to received offset voltage so as to recover or improve the operation bias voltage point.