159results about How to "High signal accuracy" patented technology

An adaptive pre-equalizer is disclosed to compensate amplitude ripples in a low cost transmitter pass-band filter. A filtered-x LMS algorithm is proposed to calculate the equalizer coefficients. To this purpose, the modulated RF signal is demodulated at the transmitter and subtracted from a filtered version of the original base band signal. The impulse response of the low-cost transmit filter is approximated by a delay. The disclosure may be applied to direct conversion or heterodyne transmitters using OFDM.

The invention relates to a high-precision map generating system and method, wherein the system comprises: a data acquisition module that acquires driving data of each trajectory point on a vehicle driving trajectory and plane xy coordinates on trajectory points on a road center line in accordance with vehicular DGPS (differential global positioning system) data provided by a DGPS and image data ofa scene in front of a vehicle provided by a camera; a data processing module connected with the data acquisition module and which generates the road center line according to the driving data of the trajectory points and the plane xy coordinates of the trajectory points on the road center line, and acquires structural information of a whole map by generating road topological relation according tothe road center line; and a map display module connected with the data processing module. By fusing image information acquired by the camera and the DGPS information, a high-precision map can be generated at low cost.

A processing device and method for an error adjustment system for equalizing transmission characteristics of N signal processing circuitries according to N signal branches (N>1) are disclosed. An original complex IQ signal of a signal branch of N signal branches and a processed real signal of the signal branch are received. A processed complex IQ signal of the signal branch is calculated from the processed real signal and the original complex IQ signal of the signal branch. Then, a difference between the processed complex IQ signal and the original complex IQ signal is calculated. Finally, control values of a correction function of the signal branch are calculated on the basis of the calculated difference. The calculated control values are supplied to the correction function of the signal branch. The receiving, calculating and supplying operations are performed for all N signal branches.

The invention relates to a Beidou 2nd generation B1 and B3 double-frequency receiver, the receiver comprises an amplifying and filtering circuit, a power dividing circuit, a B1 narrow-band band-pass filter, a B3 narrow-band band-pass filter, a down-conversion and analog-digital conversion sampling circuit, a crystal oscillator, an intermediate frequency (IF) digital signal processing circuit, a measured data preprocessing module, a combined filtering module and a navigation and positioning module. According to the invention, the civilian used Beidou 2nd generation B1, B3 double-frequency signal double-end selectable input is adopted by the receiver, the B1, B3 double-frequency signal can be simultaneously demodulated and performed positioning calculation, a self-adaptive difference positioning algorithm is adopted, the dependency of GPS system is avoided, the navigation and positioning precision of Beidou system is effectively improved, and a reliable positioning continuity and a relatively high positioning precision are provided under conditions of poor observation condition and less available satellite number.

The present invention provides an analog ultrasonic seismic signal physical excitated, receiving system of its method. The system includes an excitation source, an ultransonic transmitting probe, an ultransonic receiving probe, an analog-to-digital converter, an amplifier, a center signal processing and controlling unit and an input/output exterior unit; further including a controlling adjustable voltage control unit set in the signal excitation source and gain control unit of the receiving signal set in the signal receiving terminal. The invention processes quantification control to the emitting energy and receiving gain to meet needs of complex multi-layer physical model observation in the laboratory. The invention adds quantitative control pulse signal launch procedure and structure in the excitation source, making the high-low amplitude of the emitting energy quantitative control, processing quantitative set for signal from different channels on one hand, on the other hand adds quantitative control magnified steps and structure in the amplifier of the receiving end, resolving the technical problem of the lower accuracy and receiving signal distortion in the present technology.

The invention relates to a method for controlling infrared learning, which is achieved by the following steps: using a TFDU4100 infrared data transmission module to acquire infrared signals; after 74LS14 shaping, using ATMEGA8515 external interrupt 0 pin to receive signals; and using timers T0 and T1 to measure and calculate out the period of infrared carriers and the time of actual high-low level after demodulation. The method has the advantages that the frequency range width of infrared carrier signals can be recognized, the learned signal precision is high, and the accuracy is good.

A method/device for evaluating oxygen sensor signals of an air supply channel connected to an exhaust gas channel of the internal combustion engine, via an exhaust gas recirculation having at least one exhaust gas recirculation valve; the oxygen sensor being downstream from the exhaust gas recirculation initiation; the sensor signal(s) being corrected as a function of at least one characteristics variable describing the dependence of the sensor signal on the oxygen concentration or a correlated variable, and/or additional physical variables. At at least one engine operating point(s), in response to a closed exhaust gas recirculation valve, output oxygen sensor signals and additional operating point parameters are recorded/stored; and an adaptation of the characteristic variables is derived assuming that the gas composition corresponds to pure air. Also, a characteristics curve adjustment and a compensation of pressure temperature dependencies may be performed to improve the accuracy of the oxygen sensor signals.

According to a network signal anti-interference transmission device, a signal frequency modulation circuit receives a signal source at the signal input end, baseband frequency signals are generated through an oscillation circuit, and the baseband frequency signals enter an impedance conversion circuit after being further subjected to frequency modulation through an automatic tuning circuit and enter a modulation circuit after being subjected to isolation, follow-up amplification and further isolation, so that the signal precision is improved; the frequency hopping control circuit generates a carrier signal by using an oscillation circuit; after frequency multiplication by the frequency multiplier, signals are output to the modulation circuit. A linkage tuning loop follows the automatic tuning loop to control the frequency of a carrier signal to change frequency points. Harmonic frequency interference with a carrier signal after frequency multiplication of the interference signal is avoided. A detector circuit feeds back a signal after frequency multiplication. On one hand, the effect of stabilizing the oscillation amplitude is achieved, on the other hand, automatic frequency multiplication and frequency modulation are achieved during amplitude attenuation, same-frequency interference in transmission is avoided, the modulation circuit modulates a high-frequency carrier signal and a baseband frequency signal through a triode Q5, and finally frequency selection is conducted through an LC tuning loop, that is, pilot-frequency interference is avoided, and then the signals are output toa transmitter.

The invention relates to a system and method for measuring and tracking the resonance frequency. The system mainly comprises a computer, a multifunctional data collecting card, a direct numerical frequency synthesizer and a sensor interface circuit. Compared with a traditional phase-locked loop circuit, a phase shifter is eliminated, interference of unnecessary units to signals is reduced, and the accuracy of the signals is improved. According to the system and method, measuring and tracking of the resonance frequency are simplified, the resonance frequency and changes of the resonance frequency can be conveniently observed in real time and automatically stored in a storage device, and the detection process is completely and automatically completed through the system without intervention of a technical person.

The invention relates to a nitrogen oxide sensor. The nitrogen oxide sensor is formed by multiple layers of rectangular substrates, wherein a first layer of substrate, a second layer of substrate and a third layer of substrate from top to bottom form a gas inlet, a first chamber and a second chamber; an oxygen pump is arranged in the first chamber, an oxygen measuring pump is arranged in the second chamber, and a dispersion barrier part is arranged between the first chamber and the second chamber. An electrode of the oxygen pump consists of a first electrode and a second electrode which are arranged on the upper surface and the lower surface of the first layer of substrate, an electrode of the oxygen measuring pump consists of a third electrode and a fourth electrode which are arranged on the upper surface and the lower surface of a third layer of substrate, and a reference gas passage which is communicated with the atmosphere is arranged on the third layer of substrate. By adopting the nitrogen oxide sensor, the six-wire system is realized, the structure is optimized, and a good foundation is laid for the subsequent signal precision.

A machine-readable medium thereupon stored a design structure; the design structure includes a receiver for a data communications system. The receiver includes a data path for receiving a data signal from a data channel, the data path comprising an automatic gain control (AGC) loop; and, a signal detector for generating a data valid signal indicative of the validity of the data signal in response to detection of the data signal on the channel exceeding a threshold and in dependence upon gain information from the AGC loop in the data path.

A circuit device includes a power supply circuit and a digital temperature compensated oscillation circuit. The digital temperature compensated oscillation circuit includes an A/D conversion unit, a processing unit, and an oscillation signal generation circuit. The A/D conversion unit performs A/D conversion of a temperature detection voltage from a temperature sensor unit. The processing unit performs temperature compensation processing of an oscillation frequency based on temperature detection data. The oscillation signal generation circuit generates an oscillation signal of the oscillation frequency using frequency control data and a vibrator. The power supply circuit includes at least one reference voltage generation circuit that generates a reference voltage based on a work function difference between transistors. The power supply circuit supplies the reference voltage generated by the reference voltage generation circuit to the digital temperature compensated oscillation circuit as a power supply voltage.

The invention discloses an online detection device for an optical film. The online detection device comprises an encoder, a front signal processing module, an FPGA (Field Programmable Gata Array) signal processing module, more than two driving modules and linear array CCD (Charge Coupled Device) cameras, wherein the FPGA signal processing module comprises a synchronous detection circuit and a signal selecting circuit; and a signal output by the encoder passes through the front signal processing module, is subjected to synchronous detection and signal selection in the FPGA signal processing module, and is distributed to a multi-path driving module to control the linear array CCD cameras connected with the driving module to work. Driving signals of a plurality of linear array CCD cameras come from the same encoder, so that the problem of signal source consistence of control signals is solved, and the signal synchronism is high. Synchronous signal subdivision is performed by using the synchronous detection circuit in the FPGA signal processing module, so that the signal synchronism is further enhanced, gray level images with high synchronism are provided for an image processing module, and image distortion is reduced.

The on-line cigarette quality detection set includes one electric part and one mechanical part. The electric part includes a display and a logic control unit connected via serial shielded communication cable and as the kernels, as well as a signal acquiring system and a signal logic treating and controlling unit. The signal logic treating and controlling unit comprising signal logic treating and controller receives the signal from the signal acquiring system and has output connected to the logic control unit and an eliminating system. The signal acquiring system consists of an empty head detecting unit and a no-filter tip monitoring unit and a sensor. The eliminating system is the mechanical part including an eliminating drum unit and a sensor installing unit. The present invention can eliminate cigarettes with loose head or no filter tip to raise cigarette quality.

An output signal device and method that provides the operator force feedback similar to a pilot control joystick. These force feedback regions include free play, dead-band start of modulation, modulation, fore-warning bumper and hold near max angle. This output signal device may also vary the fore-warning feel and hold positions to be at any angle. This output signal device uses force sensing as the signal and has force slope changes used as auto-calibration of the output signal. This improves signal accuracy and provides a service prognostic signal. The prognostic signal may be used to activate redundant sensor. The variable force feedback may improve operation on rough terrain. The force feedback, may allow more productive operating positions to be learned. This enables productivity and other important job site criteria such as fuel usage to be optimized by interactive communication with this output signal device.

The invention discloses an interconnection structure. The interconnection structure comprises a lower wiring structure which is located on a substrate, a shielding layer which is located on the lower wiring structure, and an upper wiring structure which is located on the shielding layer, wherein the shielding layer comprises grapheme. According to the interconnection structure and a manufacture method thereof, which are provided by the invention, the grapheme which is a single crystal thin conductive material is used as the shielding layer between upper and lower metal connecting lines; the connecting line noise of a small size device is effectively reduced; and the signal accuracy of the device is improved.

An electrical machine including at least one sensor, a transducer wheel at which the sensor axially picks up a signal, an end face of the sensor being adjacent to an annular face on one face end of the transducer wheel, a shaft, on which the transducer wheel is axially displaceably secured, a fixed bearing, and a loose bearing, in which bearings the shaft is supported, and a housing. At least one stop on the machine having at least one stop face that points in the direction of the fixed bearing and has at least one stop face on the transducer wheel, the stop faces being oriented toward one another and axially facing one another. Viewed in the direction of the transducer wheel, the stop faces are designed relative to one another such that the two diametrically opposed active surfaces of the sensor and of the transducer wheel barely do not touch. As a result, the power deviation of the complete electrical machine is reduced due to the minimization of the required axial spacing tolerances between the sensor and the transducer wheel.

A system analyzer may generate an estimated frequency response of a device, system, communication medium, or combination thereof by utilizing a stimulus signal that is robust against IQ modulator impairments. A stimulus generator may be used to generate a plurality of discrete tones according to a frequency spacing and a frequency offset. The frequency spacing and the frequency offset cause spectrally inverted spurs (generated by impairments of the IQ modulator) to occur at frequencies other than frequencies of said modulated signal that are associated with said plurality of discrete tones. Additionally, by implementing a Discrete Fourier Transform (DFT) to possess a frequency resolution equal to the frequency offset, there is no leakage of power associated with the spectrally inverted spurs into frequency bins of the DFT associated with the desired frequency components. Likewise, leakage between the desired frequency components and leakage associated with the local oscillator may be avoided.

The invention relates to a method of imaging at least two chemical species using magnetic resonance imaging with signal separation for two chemical species resulting in separate signal datasets for these two chemical species, the method comprising: acquiring first and second echo data at different echo times resulting in a first and second acquired complex dataset, modelling the first and second acquired dataset by employing a spectral signal model of at least one of the chemical species, said modelling resulting in a first and second modelled complex dataset, said first and second modelled dataset comprising a first and second phase error and the separate signal datasets for the two chemical species, —determining from the first and second acquired dataset and the first and second modelled dataset the separate signal datasets for the two chemical species.

The invention discloses an RFID tag anti-collision method. A reader-writer judges whether the label data received in the same time slot is single or not. If multi-label data collision occurs in the same time slot; and if the multi-label data collision occurs again, the reader-writer receives the collided label data by adopting the new time slot again, judges whether the received label data in thesame time slot is single again, receives the collided label data by adopting the new time slot again if the multi-label data collision occurs again, and so on until the multi-label data collision doesnot occur any more. The method is good in signal receiving and transmitting stability and high in signal correctness, existing network bandwidth resources are fully utilized, time slots are efficiently utilized, soft programs are optimized, and cost is saved.

Color light sensors are used to sense colored light and a full spectrum light in order to generate at least three color channel signals and a clear channel signal. An infrared component IR is calculated by summing up the color channel signals with individual weighting factors and subtracting a weighted clear channel signal.