54results about How to "Reduce frequency requirements" patented technology

A color marking device including a control system for calibration of the device based upon dynamic color balance control of an output image. The system comprises a front end converter for converting an input signal representative of a target image comprising a preselected color into a device-dependent control signal in accordance with a device TRC, a color marking device for outputting an output image in response to the control signal, a sensor for measuring a parameter from the output image representative of a color of the output image, and, a point-wise controller for comparing the parameter with a corresponding parameter from the target image and constructing adjusted controlled points for the device TRC when the measured parameter and the corresponding parameter vary by a preselected value, a color balance controller for constructing an adjusted device TRC from the controlled points, whereby subsequently generated output images are output with the adjusted device TRC and, more accurately represent target input images.

This invention relates to a light source (201) having a plurality of light elements (207) and a control system for controlling the, light elements. The control system comprises a plurality of light element controllers (213), each connected to a respective light element (207), and arranged to obtain light element data; and a bus interface (203), which is connected to the light element controllers (213) via a light source bus (209). The bus interface (203) provides the light element controllers (213) with a general command, and the light element controllers (213) generate light element drive signals on basis of the general command and the light element data.

The invention discloses a device and method of a microwave photon channelized receiver of zero intermediate frequency. As shown in the drawings, the device comprises a laser diode (LD), two local oscillator signals (LO1, LO2), a DP-QPSK modulator, an optical band-pass filter (OBPF), a single polarization modulator (MZM), a splitter, a narrowband OBPF group, a polarization controller (PC), a polarization beam splitter (PBS), a balance detector (BPD) and a multi-channel ADC. The DP-QPSK modulator generates polarization multiplexing signals of an optical frequency comb and positive and negative second-order sidebands, a radio frequency (RF) signal modulates the positive and negative second-order sidebands, a generated lower sideband is within a spectral line of the optical frequency comb, and the narrowband OBPF group performs balance detection after channel division and performs demodulation to obtain IQ data. DC bias and even distortion are suppressed by the balance detection, and the IQ amplitude and the phase balance can be finely corrected by optical power and a polarization state.

The invention discloses a capacitor coupling noncontact conductance measurement device and method. The device comprises an alternating-current excitation source, an insulated measurement pipeline, an excitation electrode, a detection electrode, a range resistor, a virtual inductor, a differential amplifier module and a signal processing module, wherein one end of the virtual inductor is connected with the range resistor, while the other end is grounded, meanwhile, two ends of the range resistor are connected with the differential amplifier module. The virtual inductor substitutes an actual inductor, thus effectively overcoming the adverse effect of a coupled capacitor on the measurement result according to the series resonance principle. The virtual inductor is a grounding inductor, and compared with a floating inductor, the virtual inductor is good in working stability and simple in circuit structure; compared with an actual inductor, the virtual inductor capable of adjusting the equivalent inductance value reduces the requirement for the frequency of the excitation source. In addition, different from a noncontact conductance measurement method adopting a current method, the capacitor coupling noncontact conductance measurement method adopts a voltage method to obtain the equivalent conductance value of measured conductive fluid, thus providing helpful reference for solving the conductance measurement problem of conductive fluid in a pipeline.

The invention relates to a tooting detection and positioning method based on a microphone area array to effectively and quickly determine the azimuth angle of a violating toot. The method first receives a tooting signal based on the microphone area array, and then samples the received signal through a hardware system. The method mainly analyzes the hardware-sampled data. In addition, in consideration that the hardware may not support a high sampling rate under actual conditions, a re-sampling part is added to the method to increase the sampling rate and to reduce a positioning error. The method first estimates an arrival time difference between each microphone array element and a reference point, performs a corresponding time shift on each array element received signal, then weights the time-aligned signals, adds the results together to form an output, subjects the beamformed data to Fourier transformation, traverses the possible positions of a sound source to guide beam subjected to the Fourier transformation, finds out the point where the output is the largest, and calculates the azimuth angle of the tooting sound wave.

The invention discloses a high-order odd harmonic THz source frequency multiplier, and aims to provide a frequency multiplier which is simple in structure, high in efficiency and capable of effectively providing terahertz signals. The high-order odd harmonic THz source frequency multiplier is implemented according to the technical scheme that an external radio frequency signal is inputted through a standard rectangular waveguide (1), gets into a local oscillator low-pass filter (3) through an input waveguide-microstrip transition structure (2) and then enters a Schottky diode. Meanwhile, the external part performs feed excitation on the Schottky diode through direct current feed of a fundamental wave low-pass filter (4). The Schottky diode performs frequency conversion on input fundamental waves to generate high-order harmonic waves which comprise odd harmonic components and even harmonic components, finally the high-order harmonic waves get into an output waveguide (7) through an output microstrip-waveguide transition structure (6), the waveguide is lowered, a high-pass filter for filtering the even harmonic waves is formed, and output is performed through the standard rectangular waveguide. The high-order odd harmonic THz source frequency multiplier solves a problem of realizing a terahertz signal source.

The invention discloses a photoelectric detector frequency response measurement method based on frequency mixing. The method comprises the following steps: respectively modulating two paths of homologous optical carriers by using two paths of microwave signals with angular frequencies of delta omega and omega e to respectively obtain a carrier-suppressed optical single-sideband modulation signal and a carrier-suppressed optical double-sideband modulation signal under the condition of being less than the delta omega by the omega e; coupling the carrier-suppressed optical single-sideband modulation signal and the carrier-suppressed optical double-sideband modulation signal and then inputting the coupled signals into a to-be-measured photoelectric detector and measuring a (delta omega+omega e) component and a (delta omega-omega e) component in a photocurrent signal outputted by the to-be-measured photoelectric detector; and calculating a frequency response of the to-be-measured photoelectric detector at frequencies of delta omega+omega e and delta omega-omega e based on the measured data. In addition, the invention also discloses a photoelectric detector frequency response measurementdevice based on frequency mixing. According to the invention, the limitation of the bandwidth of the electro-optical modulator can be broken through; the measurement range of the photoelectric frequency response is doubled and the measurement efficiency is improved; and the measurement time and the measurement cost are reduced.

Provided are a method for generating polarization orthogonal dual-wavelength optical signals with a large tuning range for a frequency interval, and a device thereof. The method comprises: two parallel double-parallel Mach-zehnder modulators forming an integrated modulator, a Sagnac ring being embedded with a narrow-band fiber bragg grating, under a large-signal modulation mode, one double-parallel Mach-zehnder modulator generating carrier waves and a high-order nonlinear optical edge band, and the other double-parallel Mach-zehnder modulator performing non-microwave local oscillation modulation, two output optical signals being polarized orthogonal coupled, and the polarized orthogonal coupled two paths of optical signals projecting to a same direction, restraining optical carrier, to obtain a high-order dual-wavelength optical edge band, inputting the Sagnac ring which is embedded with the fiber bragg grating and a polarization coupler, using characteristics of reflection of a fiber bragg grating narrow band and transmission of a wide band, to realize wavelength separation, using a characteristic of polarization selection of the polarization coupler, to realize polarization orthogonal coupling of dual-wavelength optical signals, and on the output end of the Sagnac ring, the polarization orthogonal dual-wavelength optical signals are obtained. The method is advantaged by high clock multiplier factor and large tuning range.

A rotated representation of an image is printed by using a coordinate system to assign tile divisions to the image. The size of the tile divisions are selected to maintain their area equal to, or less, than a predetermined maximum. Each segment of the image, as defined by the tile delineations, is sent separately to a data processing unit for processing. The received tile is assigned new coordinate dictating its new target position on a printed page, and its relation to the other tiles. The tile is itself further rotated prior to being send to the printer.

The invention discloses a testing device for linearity of an electro-optical modulator. If the electro-optical modulator to be tested is an intensity modulator, an optical wave from an optical source is sent to the electro-optical modulator to be tested, a modulation signal generator generates a modulation signal and sends the modulation signal to the electro-optical modulator to be tested, a first demodulator circuit and a second demodulator circuit; a test signal generator generates a test signal and sends the test signal to the electro-optical modulator to be tested and the first demodulator circuit. In the electro-optical modulator to be tested, the modulation signal causes the two optical waves to generate modulation phase difference, the test signal causes the two optical waves to generate test phase difference, the two optical waves are interfered and sent to a detector, and sent to the second demodulation circuit after photoelectric conversion, the first demodulation circuit obtains the size of the test signal, and the second demodulation circuit obtains the test phase difference; if the electro-optical modulator to be tested is a Y-waveguide integrated optical device, the optical wave of the optical source is sent to the electro-optical modulator to be tested by an electro-optical modulator for modulation, the modulation signal from the modulation signal generator is sent to the electro-optical modulator for modulation, the test signal from the test signal generator is sent to the tested electro-optical modulator, and the other structures are not changed.

The invention discloses a dynamic primary thermal power generating unit frequency modulation control method for a power grid with the high wind power penetration rate, and relates to a dynamic primary thermal power generating unit frequency modulation control method. In order to reduce influences caused by wind power output power fluctuation on system frequency stabilization, the primary frequency modulation control method for dynamically adjusting a difference adjustment coefficient of a thermal power generating unit is proposed by analyzing the frequency response characteristics of the thermal power generating unit when primary frequency modulation is conducted on the thermal power generating unit on the premise that the stability of the thermal power generating unit is guaranteed. According to the control method, the primary frequency modulation capability of the thermal power generating unit can be effectively improved, the thermal power generating unit can achieve the higher flexibility and capability when primary frequency modulation is conducted on the thermal power generating unit, and therefore frequency stabilization of a wind power-containing system is promoted. In a wind power-containing single-area simulation system, when 15% of wind power prediction errors are taken into account, the maximum fluctuation deviation of the system frequency is decreased to 0.0663 Hz from 0.126 Hz, and therefore the requirement of the power grid on the frequency is met. The control method is applied in the field of thermal power generating unit control.

The chip is composed of following parts mainly: CPU, conditional receiving module, audio/video decoder, post-processing module for video, audio/video output module, bus and clock management, external memory controller, and general purpose interface etc. Data interaction of these parts is carried out through system bus and general bus mainly. The disclosed chip possesses low requirement for system frequency to realize normal decoding audio/video for example at system clock 54MHz. Features are: low power consumption, low requirement for SOC design technology, and high ratio between performance and cost. The chip possesses abundant interface functions and built in 32 bits RISC CPU, which is in favor of users to carry out development in second times.

The invention relates to a micro-motion platform for a photo-etching motion platform system and a control method thereof. The micro-motion platform is mounted on a motion part of a workpiece platformand comprises a micro-motion plate and four vertical motors arranged at the bottom of the micro-motion plate; the four vertical motors are arranged at two sides of the micro-motion plate; each vertical motor is correspondingly provided with a sensor; an Rz motor is arranged between the two vertical motors at the same side; an air-floating decoupling device is arranged at a part which is no more than 30mm far away from the mass center of the micro-motion plate. According to the micro-motion platform provided by the invention, the four vertical motors and the four sensors are adopted to realizeredundancy control according to a redundancy driving principle and a redundancy measurement principle and the requirements on the frequency of the micro-motion plate are reduced; only if the frequencyof the micro-motion plate reaches about 120Hz, the bandwidth of 50Hz can be obtained; the requirements on valuable materials are reduced and the cost is reduced; the air-floating decoupling device isclose to the mass center of the micro-motion plate, but not the form center of the micro-motion plate, so that the output power of the Rz motor is extremely reduced.

The invention relates to the technical field of pin mounting equipment for a holder, in particular to a pin mounting machine for the holder. The pin mounting machine for the holder comprises a supporting frame, a storage hopper and a pin mounting device, wherein both the storage hopper and the pin mounting device are fixedly arranged on the supporting frame; a plurality of rolling pins can be stored in the storage hopper; a discharge end of the storage hopper communicates with a charge end of the pin mounting device; the storage device can provide rolling pins for the pin mounting device; theholder can be mounted in the pin mounting device; and the pin mounting device is used for mounting the rolling pins onto the holder. The pin mounting machine for the holder provided by the invention is high in pin mounting efficiency and is relatively high in finished product qualification rate

Compositions and methods for extending the shelf life, quality and performance of plants under moisture stress. The compositions include an antioxidant and an osmolyte dissolved in water. The compositions can be prepared from a dry or liquid concentrate. When prepared from a liquid concentrate, the compositions also preferably include a wetting agent, an emulsifier a preservative and a colorant. In a preferred method of the invention, the compositions are formulated for application via sub-irrigation, drench and/or drip, or are formulated for application via overhead. The compositions maximize water saturation ability (container capacity), and provide better water retention and better rewetting ability. The compositions also improve water usage efficiency and reduce watering frequency requirements. These affects last multiple watering cycles, thereby providing product efficacy.

The invention provides a method, a device and a system for modulating a zero sequence voltage pulse width of a three-phase four-legged APF (active power filter). The method comprises the following steps of solving a zero sequence component according to a reference value of a voltage of midpoints of legs A, B and C of the three-phase four-legged arm APF to a midpoint of a leg N of the three-phase four-legged arm APF; controlling a pulse duty ratio according to a reference value of a voltage of a calculating point N of the three-phase four-legged APF to a point O of a cathode of a direct-current bus capacitor and a switch tube of the leg N; and solving a voltage of the midpoints of the legs A, B and C of the three-phase four-legged APF to the point O of the cathode of the direct-current bus capacitor and a corresponding duty ratio. A zero sequence voltage linear control pulse width modulation strategy is applied to the three-phase four-legged APF. Compared with the traditional 3D-SVPWM (three-dimensional space vector pulse width modulation) strategy, the zero sequence voltage linear control pulse width modulation strategy is easy to implement and can reduce calculation delay and requirements on main frequency; and the response speed of the three-phase four-legged APF can be increased further, the harmonic compensation accuracy of the three-phase four-legged APF can be improved, hardware investment is saved, and the method has an important practical significance on practical degree of a project of the three-phase four-legged APF.

The invention provides an algorithm for synchronously controlling the position and the speed of two parallel axes. Initial synchronous positions of the two parallel positions marked by measuring tool are used, two corresponding initial points are taken as zero points of the two axes, the direct search method is used, one of the two parallel axes is used as the X axis, and the other is used as the Y axis; the projections of a straight line, of which the interpolation slope on the XOY plane is one, on the two axes are the same, so that the position synchronism of the two axes is achieved; and according to the direct search method, the displacements of the two axes are equal in the same interpolation period, so that the speed synchronism of the two axes is achieved. The technical proposal of the invention has the advantages that the two axes in a large span adopt two servo motors for independent drive so as to realize the synchronism of the speed and the position; no driving or driven axis is arranged; the synchronism of the speed and the position are completely achieved; the synchronism of the speed and the position can be successfully achieved on the common movement control card; and the method is quite good in actual meaning.

The invention relates to a single-groove double-needle faller, a double-station flat knitting machine bottom plate, a computerized flat knitting machine and a knitting method. Two knitting needle setsare placed in a needle groove of the single-groove double-needle faller, and can independently conduct the knitting work not at the same time. Two working stations are arranged on the double-stationflat knitting machine bottom plate and control the two knitting needle sets in the same needle groove of the single-groove double-needle faller correspondingly. The function of the computerized flat knitting machine with the single-groove double-needle faller and the double-station flat knitting machine bottom plate is greatly improved, the kinds of knitted fabrics which can be knitted are multiple, and the better economic benefit is achieved. Each working position in the double-station flat knitting machine bottom plate can comprises a knitting pressing piece or not, two bottom plates can conduct seven knitting actions of tucking, knitting, needle turnover, needle receiving, tight tucking, tight knitting and non-knitting, and the double-station flat knitting machine bottom plate with theknitting pressing piece can also conduct the knitting and tucking actions in the same row under the action of the cooperation with the single-groove double-needle faller.