226 results about "Zero error" patented technology

The invention discloses a novel industrial robot zero-position self-calibration method and a novel industrial robot zero-position self-calibration device. In the method, a PSD device is optionally arranged in a robot-reachable working space first, and then a central point projected on the PSD is automatically positioned by depending on a beam of laser passing through the tail end of the robot so as to realize a calibration task of the robot. Accurate positioning and control of the robot is realized through high-precision PSD feedback; the position of the PSD central point is calculated by a wire-based method; and the zero error of the robot is obtained through an iterative algorithm by establishing a target function based on point constraint. The method does not need the position of the PSD central point or actual physical contact measurement, and has the obvious advantages of low cost, automation, portability, high efficiency, high precision and the like.

An integrated circuit includes one or more portions having error detection and error correction circuits and which is operated with operating parameters giving finite non-zero error rate as well as one or more portions formed and operated to provide a zero error rate.

Limit-cycle oscillation (LCO) generation by altering a digital transfer function of a feedback loop element provides a controllable method and apparatus for generating LCOs within a switch-mode power supply (SMPS). Measurements of the LCO characteristics can then be used to determine characteristics of the SMPS and/or determine proper compensation schemes. At least a zero error code of the feedback loop element is removed, causing the control value to oscillate between at least two values. Additional codes may be progressively removed until an LCO is detected, in order to ensure LCO generation with minimum disruption of SMPS operation. An analog-to-digital converter (ADC) that converts an output voltage or current to a control value may be used to generate an LCO by removing one or more output codes to alter its transfer function. Alternatively, a quantization step of the pulse-width modulator or other modulator may be increased to temporarily cause LCOs.

A method and apparatus for perfectly lossless and minimal-loss interconversion of digital color data between spectral color spaces (RGB) and perceptually based luma-chroma color spaces (Y′C_BC_R) is disclosed. In particular, the present invention provides a process for converting digital pixels from R′G′B′ space to Y′C_BC_R space and back, or from Y′C_BC_R space to R′G′B′ space and back, with zero error, or, in constant-precision implementations, with guaranteed minimal error. This invention permits digital video editing and image editing systems to repeatedly interconvert between color spaces without accumulating errors. In image codecs, this invention can improve the quality of lossy image compressors independently of their core algorithms, and enables lossless image compressors to operate in a different color space than the source data without thereby becoming lossy. The present invention uses fixed-point arithmetic with signed and unsigned rounding normalization at key points in the process to maintain reversibility.

The invention relates to a laser angle interferometry system provided with a turntable with standard angle and a measuring method, which resolves problems that measuring range of the existing laser angle interferometer is small, initial zero error and error of reflector constant A influences the measurement accuracy. A laser head (1) is fixed at an angle interferometer (2), a top wall (4) of the turntable with standard angle is connected with an angle reflector (3), wherein laser emitted from the laser head (1) projects to the angle reflector (3), the top wall (4) of the turntable is in tight fit with a spindle (9), a chassis of the turntable (5) is in movable fit with the spindle (9), the top wall (4) of the turntable and the chassis of the turntable can be rotated relatively, further the chassis of the turntable is connected with a turntable to be measured (6) via a bolt (7). When measuring, the top wall (4) of the turntable and the angle reflector (3) can rotate in identical angle in opposite directions in sequence with respect to integer of the turntable to be measured (6), the chassis of the turntable (5), the top wall of the turntable (4) and the angle reflector (3), ensuring laser beam is not deviated from the angle reflector (3), reading each readout of the laser angle interferometer after rotating in sequence, and obtaining measured value of each arbitrary angle by calculating.

A memory controller 4 for a NAND memory array 2 includes error detecting circuitry having input circuitry 6, fast zero-error detecting circuitry 10, fast-path error correcting circuitry 16, 24, slow-path error correcting circuitry 18, 22 and fast-bad-block detecting circuitry 28.

The invention discloses an initial alignment and self-calibration method of a double-shaft rotation type strapdown inertial navigation system. For an inertial navigation system, inertial device errors and misalignment angles are main factors capable of influencing the positioning accuracy of the system; for meeting requirements of long navigation time and high accuracy, the inertial device errors and the misalignment angles can be calibrated so as to guarantee the positioning accuracy of the system. According to a transposition scheme disclosed by the invention, the observable degree of the inertial navigation system can be maximally improved without external auxiliary information, not only can the misalignment angles be rapidly and accurately calibrated, but also the main inertial device errors including constant gyroscopic drift errors, accelerometer zero errors, gyroscope scale factor errors and the like can be calibrated, and the positioning accuracy of the strapdown inertial navigation system can be greatly improved after the errors are compensated.

A data processing system and method for regulating a voltage supply to functional circuitry of the data processing system is provided. The functional circuitry is configured to operate from a voltage supply whose voltage level is variable, the functional circuitry having at least one error correction circuit configured to detect errors in operation of the functional circuitry and to repair those errors in operation. Voltage regulator circuitry provides the voltage supply to the functional circuitry, and modifies the voltage level of the voltage supply based on a feedback control signal. Error rate history circuitry receives error indications from the error correction circuit during operation of the functional circuitry and generates error rate history information therefrom. An adaptive controller then generates the feedback control signal in dependence on the error rate history information such that the adaptive controller adjusts the feedback control signal over time having regard to the error rate history information in order to obtain a predetermined target non-zero error rate within the functional circuitry. Such an approach enables a significant reduction in power consumption of the data processing system to be achieved.

A method for determination of the zero error of a Coriolis gyro. Appropriate disturbance forces are applied to the resonator of the Coriolis gyro such that at least one natural oscillation of the resonator is stimulated that differs from the stimulating and read oscillations. A change in a read signal which represents the read oscillation and results from the stimulation of the at least one natural oscillation is determined as a measure of the zero error.

An integrated circuit includes a plurality of processing stages each including processing logic 1014, a non-delayed signal-capture element 1016, a delayed signal-capture element 1018 and a comparator 1024. The non-delayed signal-capture element 1016 captures an output from the processing logic 1014 at a non-delayed capture time. At a later delayed capture time, the delayed signal-capture element 1018 also captures a value from the processing logic 1014. An error detection circuit 1026 and error correction circuit 1028 detect and correct random errors in the delayed value and supplies an error-checked delayed value to the comparator 1024. The comparator 1024 compares the error-checked delayed value and the non-delayed value and if they are not equal this indicates that the non-delayed value was captured too soon and should be replaced by the error-checked delayed value. The non-delayed value is passed to the subsequent processing stage immediately following its capture and accordingly error recovery mechanisms are used to suppress the erroneous processing which has occurred by the subsequent processing stages, such as gating the clock and allowing the correct signal values to propagate through the subsequent processing logic before restarting the clock. The operating parameters of the integrated circuit, such as the clock frequency, the operating voltage, the body biased voltage, temperature and the like are adjusted so as to maintain a finite non-zero error rate in a manner that increases overall performance.

A servo or control technique and apparatus for performing wavelength locking employs the phase-shift modulation scheme to adjust one or more optical elements in the laser cavity to lock the lasing frequency toward a desired channel frequency. A controller comprises a high bandwidth mode and a low bandwidth mode. When initially locking to a new channel, the high bandwidth controller mode may be used to supply more energy to drive an actuator to achieve faster seeking. When an error signal approaches within a pre-defined threshold of zero error, the controller may be switched to a lower bandwidth mode supplying less power to the actuator to softly approach the target frequency and avoid overshoot. The lower bandwidth controller mode may keep the noise level lower and provide better frequency tracking stability to the tunable laser.

The invention relates to a programmable digital frequency multiplier comprising a clock frequency multiplier unit, an input signal real-time synchronous measuring unit, a real-time data operation unit and a frequency multiplier output unit. The clock frequency multiplier unit is used for receiving and converting a clock signal of an external low-frequency system into a high-frequency sampling clock signal needed by other units in the frequency multiplier, the input signal real-time synchronous measuring unit is connected with the high-frequency sampling clock signal output end of the clock frequency multiplier unit and used for receiving an input signal to be multiplied in frequency and carrying out the synchronous periodic counting to the input signal by utilizing the high-frequency sampling clock signal so as to output a period counting value, the real-time data operation unit receives a to-be-multiplied coefficient and carries out division operation to the period counting value andthe frequency multiplication coefficient by utilizing the high-frequency sampling clock signal, and the frequency multiplier output unit receives the to-be-multiplied coefficient, selects a suitable pulse period according to the relation between an integer and a remainder and outputs N multiplied pulse signals with zero error. The invention greatly improves the whole anti-interference capability of the circuit by external inputting low-frequency clock and can be particularly applied to an I/F (Interface) conversion post-stage circuit.

The invention discloses a couple-part symmetry-degree zero-error positioning device, which comprises a substrate, a positioning assembly, two clamping adjusting assemblies and two pneumatic clamping assemblies; the position of a rotary positioning screw in the positioning assembly is fixed and adjusted by adopting the helical-type self-centering compression way, the two clamping adjusting assemblies and the two pneumatic clamping assemblies realize synchronous and symmetric clamping and adjustment so as to limit the freedom of a couple part in the left-right direction, other degrees of freedom of the couple part are limited by utilizing a front baffle plate, a rear baffle plate and a pressure plate simultaneously, so that the couple part is clamped and positioned. The device utilizes the advantages of a centering clamping way and a synchronous symmetric movement way to avoid the influence of installation error and repetition precision error on the positioning error of the position, so that the zero-error positioning precision requirement of the couple part is realize theoretically. The couple-part symmetry-degree zero-error positioning device is simple in structure and strong in practicability; and moreover, the positioning position of the couple parts also can be adjusted according to real requirement. The device is also applicable to the positioning of multiple couple parts and wide in application range.

The invention provides a zero drift compensation method of a Hall magnetic sensor. At present, the existing Hall magnetic sensor has the defects that the output voltage VH of the Hall magnetic sensor is not equal to zero, and the zero error VHO is generated because of factors such as unsymmetrical geometric positions of Hall electrodes, poor ohmic contact of the electrodes, nonuniform electric resistivity, nonuniform temperature and the like when the external magnetic filed B is equal to zero. In order to eliminate the zero error, the invention mainly adopts an external compensation circuit for compensating the zero drift. When the method is used, the magnetic sensor is difficult to develop in the directions of miniaturization and intelligentization. The invention uses a CMOS process for manufacturing grooves of the MOSFET Hall magnetic sensor so that the resistance values of four equivalent resistors are changed along with the external grid voltage. The invention is applicable to the fields of medicine, automobiles and the like.

The invention discloses a desktop-level 3D printer which comprises a printer frame, a controller, a material conveying device, an X-Y-Z-axis moving device, a feeding device and a sprayer device. The material conveying device and the X-Y-Z-axis moving device are mounted on the printer frame. The feeding device and the sprayer device are mounted on the X-Y-Z-axis moving device. The material conveying device is connected with the feeding device. The feeding device is connected with the sprayer device. The controller is electrically connected with the material conveying device, the X-Y-Z-axis moving device, the feeding device and the sprayer device. According to the desktop-level 3D printer, effective multi-color printing is achieved, and a printed model is high in precision; the printing effect is good, and color switching with nearly zero error can be achieved. Meanwhile, the environmental characteristics similar to those of constant-temperature printing materials needed by acrylonitrile butadiene styrene (ABS) can be achieved, technical support is provided for clients needing printing of the ABS, products with the largest effective printing area in the current market can be printed, and the requirements of various clients can be met.

The invention is a rotational sensor to sense an object's angle and methods to analyse the sensor output. The sensor has a first emitting source, to either emit onto, or from the object, a first receiving sensor, to receive emissions from the first emitting source, either directly or indirectly, the emissions received dependent on said angle, first receiving sensor outputting a first signal a course measurement of the angle. Also present is a second emitting source, to emit onto, or from the object and a second receiving sensor, to receive emissions from the second emitting source, either directly or indirectly the emissions received again dependent on said angle, second receiving sensor outputting a second signal, as a fine measurement of the angle. A method of use of the sensor is disclosed together with a method of combining the fine and course measurements to output a signal with zero error.

The invention discloses an elevator floor detection device based on a laser ranging technology. The detection device comprises a data processing module arranged at the top of an elevator car and a laser ranging module. According to the elevator floor detection device based on the laser ranging technology and an elevator system and method thereof, the laser ranging module is used for detecting theheight and the running direction of the car, the device system is simplified, the installation time is shortened, installation and maintenance cost is reduced, in addition, the detection precision ofthe laser ranging module can reach 1 millimeter, the collecting efficiency and the collecting precision of car information are improved, so that the elevator floor number judgment is more accurate, false alarm of the floor number is reduced, and zero error of the judgment of leveling and non-leveling is realized; meanwhile, the size of the elevator floor detection device in the scheme is small, the elevator floor detection device can be installed on a smooth surface of the top of a car roof, and compared with a traditional double-photoelectric sensor, the device is larger in installation position selectivity, and does not rely on an elevator guide rail at all; and more importantly, replacement and maintenance are more convenient, fast and time-saving, extra loss due to long-time stopping of the elevator can not be caused to a user, and the device is especially suitable for the society pursuing service at present.

The present invention discloses a fuzzy-neural global rapid terminal sliding-mode control method of a photovoltaic grid-connected inverter. The method comprises: establishing an inverter mathematic model, considering the interference and indeterminacy actually existed in the inverter, and correcting the inverter model. The control target of a voltage control-type grid-connected inverter is the zero error tracking of the output voltage o the inverter to the power grid reference voltage, and the fuzzy-neural global rapid terminal sliding-mode control method of the photovoltaic grid-connected inverter employs the global rapid terminal sliding-mode control strategy in order to allow the tracking errors to converge to zero in a limited time. aiming at the indeterminacy of the system, the fuzzy-neural network system is employed to perform online compensation to allow the inverter to have a certain adaptability for the external interference so as to greatly enhance the system robustness. The adaptive rule based on Lyapunov is designed to ensure the stability of the system. The fuzzy-neural global rapid terminal sliding-mode control method of the photovoltaic grid-connected inverter employs the fuzzy-neural global rapid terminal sliding-mode control strategy to control the grid-connected inverter to enhance the system robustness and reduce the buffeting.

The invention discloses a zero-error recent level modulating method of a modularized multi-level current converter, which can realize the tracking on the reference value of bridge arm voltage with zero error according to actual bridge arm voltage. The method comprises the following steps of measuring the capacitance and voltage of bridge arm submodules and calculating the average value of the capacitance and voltage, then dividing the average value of capacitance and voltage of the submodules with the reference value of the bridge arm voltage to obtain the number of the submodules needed to be added, subtracting the average value of capacitance and voltage of the submodules from the reference value of the bridge arm voltage, carrying out signal processing link to the difference to obtain the number of additional submodules, superposing the number of the submodules needed to be added with the number of the additional submodules, rounding a function to obtain the number of actually added submodules, and finally controlling the addition and cut-off of the bridge arm submodules through the voltage-sharing control link with the number of the actually added submodules. With the zero-error recent level modulating method, the error between the actual bridge arm voltage and the bridge arm voltage reference value can be eliminated, and double power frequency component in circulation caused by the errors can be inhibited.

A method and a device for time synchronization are disclosed according to the embodiments of the present invention. The method includes: selecting, by a slave device, a port of a single-fiber bi-directional line as a synchronization port of a 1588 clock protocol; specifying a work mode of the synchronization port; exchanging a 1588 clock synchronization packet with a master device through the synchronization port according to the work mode; acquiring transmission time information and restore a system clock according to the 1588 clock synchronization packet; and adjusting the system clock according to the work mode and the transmission time information. The device includes: a line processing module, a clock recovery module and a clock adjustment module. Through the method and the device, zero-error time synchronization is implemented; and in the case of unfixed path delay, the time synchronization can also be implemented.