484results about How to "Improve conversion accuracy" patented technology

The invention relates to a multiturn absolute rotary encoder based on a rotary transformer, which is characterized in that: a sensor is displaced by taking the rotary transformer as a shaft angle; a shaft angle decoding circuit can be formed by adopting DSP as a core processor; a sine wave which can be controlled by frequency and phase in the method that the circuit is synthesized by direct digital frequency for the numerical control of an oscillator; and the sine wave is directly taken as an excitation rotary transformer signal via a power amplifier and a filter circuit; the rotary transformer signal is transferred to A / D converter after being run through a matching circuit of electronic transformer; after sampling, digital filtering and digital signal processing, the sine and cosine value for the actual angle of two channels is generated; the angle error change is tracked dynamically by the PI algorithm; the mechanical displacement of the rotating object is converted into digital shaft angle position and speed. The multiturn absolute rotary encoder based on a rotary transformer has the advantages of high tracking speed, high conversion accuracy, high reliability, simple structure, sensitive movement, low environmental condition, strong anti-interference capability, high measuring accuracy and speed voltage output.

A system for determining an analyte concentration in a fluid sample (e.g., glucose) comprises a light source, a detector, and a central processing unit. The detector is adapted to receive spectral information corresponding to light returned from the fluid sample being analyzed and to convert the received spectral information into an electrical signal indicative of the received spectral information. The central processing unit is adapted to compare the electrical signal to an algorithm built upon correlation with the analyte in body fluid. The algorithm is adapted to convert the received spectral information into the analyte concentration in body fluid. Spectral information is delivered from the central processing unit to the light source and used to vary the intensity and timing of the light to improve the accuracy of conversion into analyte concentration.

The invention discloses a general multi-channel data collection system. The general multi-channel data collection system comprises a collection card and a master control card. The collection card collects analog signals transmitted from a collection sensor, and the analog signals are collected and converted into digital signals. The master control card carries out denoising and filtering on data in the digital signals, so that real-time correction of the data is achieved, an upper computer is connected with the master control card, and configuration information is written from the master control card, so that control over the work of a whole system is achieved. An analog-digital conversion module of the collection card converts the analog signals into the digital signals, and a photoelectric isolation module of the collection card isolates the analog portion from the digital portion of the whole data collection system completely, so that the transmission of the analog signals is not interfered by noise of a digital circuit. The photoelectric isolation module is used for reducing the influence of the noise of the analog portion on the digital portion, a precision power module of the collection card reduces the influence of power supply noise, and a phase-locked loop of the collection card guarantees phase synchronization of clock signals among the collection cards.

In a color converting device for converting input image data based on a plurality of first color components (the number of bits of each color component is k) into output image data based on plural of second color components by interpolation processing using a 3DLUT storing color correction values at grid points obtained by dividing a color space composed of the plurality of first color components, the distance of the grid points is 2n (where n is an integer smaller than k), the number Dn of grid points of the plurality of first color components is an integer satisfying 2m−1+1<Dn<2m+1+1 (where Dn≠2m+1, and m=k−n), and input image data is converted into output image data by converting each color component data of the input image data according to the number of grid points, and performing interpolation processing by reading color correction values corresponding to the converted color components from the 3DLUT.

The invention discloses an image file transfer method, device and equipment based on OCR and a readable storage medium, and relates to the field of artificial intelligence. The method comprises the steps of obtaining a to-be-shifted image; performing layout segmentation on the to-be-shifted image according to the image content of the to-be-shifted image to obtain n image layouts, each image layoutcorresponding to a content type, and n being a positive integer; according to the content type corresponding to the image layout, performing corresponding processing on the image content in the imagelayout to obtain a file transfer content corresponding to the image layout; and adding the file transfer contents corresponding to the n image layouts to the electronic document to obtain a target document; carrying out layout segmentation on the to-be-shifted image through the image content. According to the method and the device, the n image layouts corresponding to the content types are obtained, and the image contents in the image layouts are processed according to the types of the image layouts, so that different types of contents in the to-be-transferred image are identified and processed in different ways, and the conversion accuracy of converting the image into the document is improved.

The invention relates to a LED constant current drive circuit with light dimming function, comprising a LED constant current supply circuit, an analog LED current regulating circuit and a digital LED current regulating circuit. The invention has the improvement that the digital LED current regulating circuit comprises a pulse width measuring circuit for a digital light-dimming signal and a D / A converter converting a pulse width attribute output by the pulse width measuring circuit into an analog voltage value. The invention uses the pulse width measuring circuit and the D / A converter to convert a digital light-dimming PWM signal into an analog signal, and then the analog signal is sent to an analog light-dimming input end to carry out analog light dimming; thus, the digital light dimming of the LED constant current drive circuit has the same light-dimming efficiency with analog light dimming, which solves the problem of low efficiency of digital light dimming. Simultaneously, the invention also has the characteristic of high light-dimming precision by further improvement.

The invention provides a fine structure deformation monitoring method based on ground three-dimensional laser scanning. The method comprises steps that, a GPS or a total station is utilized to arrange artificial target points, and a target point monitoring net is established; point cloud data at a surface of a structure at different moments are acquired by utilizing a ground three-dimensional laser scanner; data acquired by the target point monitoring net and data acquired by the ground three-dimensional laser scanner are converted to a same reference coordinate system; the data in the same reference coordinate system are utilized to determine and fit a geometrical model of the structure; point cloud data segmentation is carried out according to the geometrical model of the structure obtained through fitting, the point cloud data segmentation is divided into multiple parts, and each part is fitted into one representative point; change of coordinates and vectors of the representative points obtained through point cloud data fitting at different moments are contrasted to carry out fine structure deformation analysis. The fine structure deformation monitoring method can realize monitoring on fine structure deformation.

The invention relates to a high temperature creep life accelerated test method of a material, which comprises: a plurality of groups of short time stress relaxation tests of the material at the same temperature, acquiring a relaxation rate-stress curve based on the numerical differentiation principle, forming a relaxation creep rate-stress curve by utilizing a relaxation equation, calculating creep data to build a creep curve, and building a steady state creep rate curve and a Norton creep equation. The method starts from the physical relation between relaxation and creep, covers rather broad properties of creep strain rate by utilizing the short time relaxation process, and educes broader creep data than that educed from general creep tests by above ten times, thereby effectively reducing the amount of high temperature creep tests and time of tests and providing basic data for development of new material and engineering application.

The invention discloses a silicon-based display adopting digital-analog hybrid drive. Pixels are driven to emit light through the method of combining the simulation amplitude modulation drive strategy and a digital pulse width modulation drive strategy, wherein the luminance of the pixels is determined by output current or voltage amplitude of the pixels in the subframe and the duty ratio of time of the output current or voltage of the pixels in the subframe, the frame of image is divided into a plurality of different digital subframes and simulation subframes, the digital drive strategy is adopted for the digital subframes, the time proportionable drive mode or luminance proportionable drive mode is adopted, the simulation drive strategy is adopted for the simulation subframes, many digital-analog converters with few digits are adopted, input data is converted into amplitude quantity of voltage or current, so that the pixels emit light, and the simulation subframes and the digital subframes are combined to generate the final display frame. The requirements of the simulation amplitude modulation drive strategy for the digital-analog converter and the requirements of the pixel circuit for the precision of analog quantity are reduced, and the conversion speed of the digital-analog converter and the contrast of the pixel luminance are improved.

The invention discloses a 1553B bus monitoring and data analysis system. The 1553B bus monitoring and data analysis system comprises a board card interface module, a thread scheduling module and a man-machine interaction interface module. The board card interface module comprises a board card initialization module, a starting / stopping receiving control module, an interrupt processing module, a data acquisition module and a failure recording module. The thread scheduling module is provided with a data monitoring storage thread, a data analysis thread, a data display thread and a message loop main thread. The man-machine interaction interface module is provided with a user authentication and management module, a monitoring mode setting module, a monitoring starting and stopping setting module, a data conversion setting module, a conversion starting and stopping setting module, a data memory module and a data list display module. According to the 1553B bus monitoring and data analysis system, a thread dynamic scheduling algorithm is adopted, comprehensive monitoring of bus data and real-time storage, display and analysis conversion of MT monitoring data can be achieved, and display of bus monitoring information stored in a specific format and conversion processing of stored data can also be achieved.

The invention discloses a successive approximation analog-to-digital converter and a correction method. The converter comprises a fully differential structured DAC based on common mode voltage restoration. The mismatch error of capacitance can be eliminated by background correction technologies. For an ideal binary capacitor array, the weight of one capacitor is equal to the sum of all weights of low position capacitors. However, mismatch of capacitance makes them different. According to the method of the invention, a redundancy switch is performed to compare the capacitance of a to-be-corrected to the sum of all weights of capacitances of the low position capacitors. Based on the two switching results of a redundancy switch of the to-be-corrected capacitor and a normal switch as well as the switching direction of the to-be-corrected capacitor, the correcting codes for each to-be-corrected capacitor are updated and stored at the background. And during ADC conversion, through a correcting DAC, the added value of the correcting codes is converted to analog quantity that is coupled to a main DAC. The system corrects all capacitances requiring correction successively and such process repeats itself.

The invention discloses a machining method of a turbine working blade, which comprises the following steps: a, unifying positioning standards of a turbine working blade blank and turbine working blade machining; b, fixing and positioning the turbine working blade blank, and performing machining according to the positioning standards; c, performing grinding to form tenon teeth, positioning machined tenon teeth, machining an upper edge plate and a lower edge plate of the turbine working blade and sawteeth of a blade tip shroud; and d, performing heat treatment and shot blasting of the machined turbine working blade to form the turbine working blade. Machining and blank standards are unified to realize the consistency of a blank mould positioning point and a machined tenon positioning point, so that an error caused by standard disunity is eliminated, the frequency of standard conversion is reduced, the conversion precision is increased, and the designed blade profile positional tolerance requirement is met; and the precision of coordinate positional tolerance evaluated by building a standard after machining is improved. The machining method is suitable for technological equipment and manufacturing of aero-engine turbine working blades.

An on-line analyzing and detecting device of coal quality is prepared as shining sample to be analyzed by laser to generate induced light spectrum; collecting said spectrum by CCD image transducer and image collection control circuit and calculating to obtain vector E of character element content in raw coal by signal processor; sending vector E into BP neural network for carrying out conversion to obtain heating value, water content, ash content, volatile composition and fixed carbon of raw coal; utilizing neural network to predict slagging index and temperature of ash melted point of raw coal.

The invention provides a method for controlling a bucket-wheel reclaiming machine with material measurement and calculation, comprising the steps as follows: a current detection module (2) detects corresponding weak alternating current voltage signal from the line current of a bucket-wheel motor current circuit (1); the weak alternating current voltage signal is transmitted to a current / voltage signal conversion module (3) so that the rectification, voltage-stabilization and amplification treatment of the signal is carried out; the voltage signal which is processed by rectification, voltage-stabilization and amplification is input to a reclaiming automatic control module (6) which controls the actions of a revolving mechanism (19) and a truck feeding mechanism (20) according to the change of the voltage signal; and the actions of the revolving mechanism (19) and the truck feeding mechanism (20) cause the bucket-wheel motor current circuit (1) to change. The invention also relates to a reclaiming automatic control device. As the reclaiming automatic control method of the invention is adopted and the reclaiming automatic control device of the invention is installed, the functions of automatic control of reclaiming, flux display and alarming when the flux exceeds the arranged value can be quickly and simply realized at low cost.

There is disclosed an image processing apparatus of the present invention in which a color region of a range including a color range that can be outputted by an image output device is mapped based on a predetermined mapping function defined between the color region and a color conversion table address space by an address map producing section, so that waste in a color conversion table is inhibited, the number of valid lattice points in the color conversion table increases, and therefore color conversion accuracy is improved.

The invention discloses a system for linearly measuring position of a control rod. According to the system, two leading-out ends of a primary coil are connected with a power panel to receive exciting current output by the power panel; a digital conversion module and a filter and amplification unit are arranged on a signal conversion circuit board; the power panel is also connected with the digital conversion module to output a reference voltage to the digital conversion module; one end of the digital conversion module is connected with two leading-out ends of a secondary coil, and the other end of the digital conversion module is connected with a processor; the digital conversion module is used for converting induction voltage of the secondary coil into a digital signal and performing isolation transformation on the digital signal to obtain voltage to be output to the processor; one end of the filter and amplification unit is connected with the two leading-out ends of the primary coil, and the other end of the filter and amplification unit is connected with the processor; the filter and amplification unit is used for performing filter and amplification processing on the voltage of the primary coil and outputting the voltage to the processor; the processor is used for calculating a rod position of the control rod. Fewer lead wires are arranged in a detector, the failure rate is low, and the measurement accuracy of the rod position is high. The invention also discloses a method for linearly measuring position of the control rod.

The invention provides a natural language query interface achievement method oriented to big data. Chinese natural language query is converted into an SQL or BSON transformation strategy, semantic depending trees are generated according to natural languages, then the semantic depending trees are converted into query trees according to established rules, and BSO sentences of SQL and NoBSON corresponding to the natural languages are obtained by parsing the query trees. The method supports corpus extension and improves the conversion accuracy in the given field. In addition, NoSQL conversion nodes are increased, and the application range of the method is widened.

A D / A conversion circuit includes a first D / A converting section which is connected with an output node, a first serial capacitor which is disposed between the output node and a first node, a second D / A converting section which is connected with the first node, and a control circuit. The first D / A converting section includes a first capacitor array section and a first switch array section. The second D / A converting section includes a second capacitor array section and a second switch array section. The control circuit performs a switch control for dynamically changing allocation of the capacitors to the respective bits of input digital data for the first switch array section of the first D / A converting section.

When an sRGB color space and an wRGB color space have a common white point in a device-independent color space, the CPU 31 of a color printer 20 eliminates deviation of the white points of the two color spaces occurring when a color value of the sRGB color space has been converted to a color value of the wRGB color space using a matrix operation L, by correcting the coefficients of matrix L. As a result of correction a matrix L′ is obtained. CPU 31 executes gamma correction on the RGB color space color value obtained by a matrix operation S, and then executes matrix operation L′. CPU 31 executes inverse gamma correction on the color value obtained by a matrix operation L′.

An A / D converter circuit includes first to fourth pulse circulation circuits and first and second counters and configured to provide high conversion accuracy irrespective of a temperature change. The first pulse circulation circuit operates with a difference voltage of a specified voltage and an analog input voltage. The first counter outputs a difference of the number of pulse circulation in the first and the second pulse circulation circuits. The third pulse circulation circuit operates with a difference voltage of the specified voltage and a set voltage. The fourth pulse circulation circuit operates with the set voltage. The second counter outputs a difference of the number of pulse circulation in the third and the fourth pulse circulation circuits. When an output value of the second counter reaches a specified value, an output value of the first counter at that time is outputted as A / D conversion data.

The invention relates to a method for converting creep data into material high-temperature stress relaxation data, which comprises the following steps: a method and a step for acquiring the material creep property data of a high-temperature component material at certain temperature and performing normalization processing on the material creep property data, a method for dividing the process of relaxation, and a process of creep-relaxation conversion. The method comprehensively considers the influences at different creep stages, improves the precision of data conversion from creep to relaxation, can acquire the relaxation property data satisfying the design requirements on engineering structures, and can be expected to replace relaxation tests having high requirements on experimental installations.

Comparator circuit and bias compensator. While a switch SW4 is connected to 'a'-terminal side, offset of a differential output voltage 'A-' of a D / A converter 500a (500b) is held in a comparator 400, and is reflected to a reference voltage. Thereafter, the switch SW4 is switched to a 'b'-terminal side, and offset of a differential output voltage 'A+' of the D / A converter 500a (500b) is measured by the comparator 400. An error signal is outputted to a counter 412 so as to count up the counter 412. Such an operation is repeatedly carried out in which the count value is added to 1.7 V and then the added count value is inputted into the D / A converter 500a (500b), and such a count value latched in a latch at timing when the error signal is inverted is defined as an offset correction value.

The invention discloses a display device and a data driving circuit adopted by the display device. The display device comprises a panel, a gate driving circuit and the data driving circuit, wherein the panel comprises a two-dimensional pixel matrix composed of multiple pixels, and multiple first-direction data lines and multiple second-direction gate scanning lines; the multiple first-direction data lines and the multiple second-direction gate scanning lines are connected with each pixel; the data driving circuit is used for providing an image signal from the data lines; the gate driving circuit is used for providing a scanning signal for the gate scanning lines; and the data lines can be divided into N groups, and the data lines in the same group share the same gate scanning line. In the invention, all transistors in a DAC (digital-to-analog converter) only realize a switching action, the accuracy of the DAC is determined by the ratio of a load capacitor on adjacent data lines, and the ratio of the load capacitor on the adjacent data lines on a display panel are more accurate, thus the output voltage of the data driving circuit is more accurate.

In a flash A / D converter including a plurality of differential amplifier circuits and a plurality of voltage comparator circuits, a regulator circuit is provided. The regulator circuit automatically regulates a bias voltage of each of the plurality of differential amplifier circuits in a differential amplifier circuit array to make an output dynamic range for the differential amplifier circuits match an input dynamic range for the plurality of voltage comparator circuits. Therefore, even if the input dynamic range for the voltage comparator circuits is narrowed with reduction in a power supply voltage, the output dynamic range for the differential amplifier circuits and the input dynamic range for the voltage comparator circuits match, thus resulting in a high A / D conversion accuracy.

The invention discloses a weight calibration method for a non-binary successive approximation type analog-digital converter, the non-binary successive approximation type analog-digital converter comprises a capacitor array and a virtual capacitor C0, the capacitor array comprises n capacitors, and n capacitor values from the largest to the smallest are Cn, Cn-1, Cn-2, Cn-3 toC1, and C1 is equal toC. According to the weight calibration calculation method of the mth capacitor, the redundant weight Rm of the mth capacitor is larger than 0, and the mth capacitor refers to the mth capacitor with the capacitance value from low to high in the capacitor array. The invention provides a weight calibration method for the non-binary successive approximation type analog-to-digital converter. Sequential control logic optimization is carried out on sampling and conversion process so that the digital logic of the calibration algorithm is simplified, only the accumulation average process is carried out. Meanwhile, the method has a faster operation result, and only one quantization error is introduced when noise is small.

The invention provides a charge coupling pipelined analogue-to-digital converter with error correction function. The analogue-to-digital converter comprises a charge coupling pipelined analogue-to-digital converter core, a common-mode error correction module, a differential mode error correction module, an input common-mode voltage offset compensation module and an error correction controller module. The charge coupling pipelined analogue-to-digital converter with error correction function can automatically detect differential mode error, common-mode error and input common-mode voltage offseterror which are caused by non-ideal characteristics in full-difference structure charge coupling pipelined analogue-to-digital converter and can correct the errors, the influence of the errors is controlled to be within the minimum resolution, so as to overcome the problem that restricts the accuracy of the existing charge coupling pipelined analogue-to-digital converter is restricted by errors caused by various non-ideal characteristics, and further the conversion accuracy of the existing charge coupling pipelined analogue-to-digital converter is improved.

The invention discloses an industrial robot absolute precision calibration system and calibration method. The calibration system comprises a three-ball base device, an end measuring device, a robot, acommunication cable, a computer and the like, and the calibration method comprises the steps that the fixed three-ball base device is used for building a world coordinate system used for describing arobot base coordinate system; the end measuring device mounted on a robot flange is used for measuring robot end position error information; the computer is used for reading position error data and robot joint angle data; and finally, all measured data are substituted into an absolute accuracy calibration algorithm of the computer to carry out iterative computation, and an exact kinematic model describing the world coordinate system is obtained. The calibration system and the calibration method are used, the posture of the robot base coordinate system and robot kinematics parameters can be accurately calibrated, and the robot absolute positioning precision can be improved.

A folding analog-to-digital converter (ADC) is disclosed. The folding ADC includes a reference voltage generating unit generating a plurality of reference voltages, a low power analog pre-processing unit including a plurality of folders, each of which compares a voltage level of an analog input signal with a corresponding reference voltage of the plurality of reference voltages to generate a pair of differential folded outputs, a comparison unit that compares outputs of the low power analog pre-processing unit to output a digital signal, and an encoding unit that converts an output of the comparison unit into a binary code signal.

The invention provides a recursive cosine transform method for plane geomagnetic anomalous field one-step upward continuation plane modulus gradient field. Plane geomagnetic anomalous field measurement data is preprocessed; the geomagnetic anomalous field measurement data irregularly and discretely distributed on an observation plane is gridded through utilization of a radial primary function interpolation method, thereby obtaining gridded geomagnetic anomalous measurement data; the gridded geomagnetic anomalous measurement data is transformed into cosine transform wave spectrums through utilization of recursive cosine transform; the wave spectrum of each component of a geomagnetic modulus gradient field is calculated according to the geomagnetic cosine transform wave spectrums through utilization of a one-step wave number domain transform factor; and recursive inverse cosine transform of line direction phase shift Pi / 2 is carried out on the wave spectrums of a horizontal x component, a horizontal y component and a vertical z component, thereby obtaining the components of the geomagnetic modulus gradient field on a continuation plane. According to the one-step method provided by the invention, the calculation quantity is half of the calculation quantity of a two-step method; through utilization of the cosine transform method, the Gibbs edge effect is reduced, and algorithm precision is improved; and the method can be applied to a data sequence with any length.

The invention discloses a full-automatic collecting liquid-plastic limit combined measuring system. The full-automatic collecting liquid-plastic limit combined measuring system comprises a liquid-plastic limit combined measuring instrument and a computer, wherein the liquid-plastic limit combined measuring instrument comprises a mounting frame, a cone head, an electromagnet, a displacement transducer, a displacement display screen, a CPU (central processing unit), a communication module, a control switch and a specimen cup; the specimen cup is placed on the mounting frame; the electromagnet, the displacement transducer, the displacement display screen, the CPU, the communication module and the control switch are arranged on the mounting frame; the cone head is arranged above the opening of the specimen cup and is adsorbed on the electromagnet; the displacement transducer is connected with the computer in a signal manner through the CPU and the communication module; and a double logarithmic chart is stored in the computer. The full-automatic collecting liquid-plastic limit combined measuring system provided by the invention can be used for acquiring, measuring and reading data in a full automatic manner and drawing a curve, so that the accuracy of the test data is improved, the work amount of experimenters is reduced, the cost of human resources is reduced, and the test efficiency is improved.