97 results about "Noise tolerance" patented technology

A system is disclosed for detecting and calculating the level of ambient and / or environmental noise, such as electromagnetic interference generated by electric power lines, ambient lights, light dimmers, television or computer displays, power supplies or transformers, and medical equipment. In some embodiments, the system performs frequency analysis on the interference signal detected by light photodetectors and determines the power of the interference signal concentrated in the analyzed frequency bands. The worst-case interference level can be determined by selecting the maximum from the computed power values. In some embodiments, the determined interference signal power can be compared with the noise tolerance of a patient monitoring system configured to reliably and non-invasively detect physiological parameters of a user. The results of the comparison can be presented to the user audio-visually. In some embodiments, the system can be used to perform spot check measurements of electromagnetic interference.

A method and apparatus to determine an encoding mode of an audio signal, and a method and apparatus to encode an audio signal according to the encoding mode. In the encoding mode determination method, a mode determination threshold for the current frame that is subject to encoding mode determination is adaptively adjusted according to a long-term feature of the audio signal for a frame (the current frame) that is subject to encoding mode determination, thereby improving the hit rate of encoding mode determination and signal classification, suppressing frequent oscillation of an encoding mode in frame units, improving noise tolerance, and improving smoothness of a reconstructed audio signal.

Provided are a classifying method and apparatus for an audio signal, and an encoding / decoding method and apparatus for an audio signal using the classifying method and apparatus. In the classification method, an audio signal is classified by adaptively adjusting a classification threshold for a frame of the audio signal that is to be classified according to a long-term feature of the audio signal, thereby improving a hit rate of signal classification, suppressing frequent mode switching per frame, improving noise tolerance, and providing smooth reconstruction of the audio signal.

A number of different dynamic circuits having improved noise tolerance and a method for designing same are provided. The circuits include a power supply node and a precharge node. Keeper circuitry is connected to the nodes and has a current-voltage characteristic that exhibits a negative differential resistance property to improve noise tolerance of the circuits.

In a method and a corresponding apparatus for performing chaotic optical time domain reflectometer, the chaotic laser signal, generated by the chaotic laser transmitter, is split into probe signal I and reference signal II by a fiber coupler. Through an optical circulator, the probe signal I is launched into the test fiber and the echo light is converted into electrical signal by a photodetector and digitalized by an A / D converter. The reference signal II is converted into electrical signal by a photodetector and digitalized by another A / D converter. Two digital signals received from two A / D converters are correlated in a signal processing device to locate the exact position of faults in fibers. The result output is then displayed on a display device. This invention was developed to overcome the tradeoff between resolution and dynamic range of the pulse-based OTDR. This method can improve the dynamic range and spatial resolution significantly; enhance the anti-jamming capability and noise tolerance. Also it has merits of simple structure and lower cost.

There is offered a signal processing circuit for an electrostatic capacity type touch sensor which can improve the noise tolerance and adjust an offset in the output voltage. The signal processing circuit for the touch sensor is structured to include an alternating current power supply providing an excitation pad with an alternating voltage, an electric charge amplifier generating an output voltage Vout corresponding to a difference between a capacitance of a first capacitor formed between a first touch pad and the excitation pad and a capacitance of a second capacitor formed between a second touch pad and the excitation pad, and an offset adjustment circuit to adjust an offset in the output voltage Vout of the electric charge amplifier.

One embodiment of the present invention provides a method coding audio signals in a base layer and an enhancement layer comprising the steps of quantizing the audio signals in spectral lines into quantized data in a plurality of sub-bands in an order of most significant bits (MSBs) to least significant bits (LSBs), determining a plurality of scale factors corresponding to each of the sub-bands according to respective noise tolerance of each of the sub-bands, bit shifting the quantized data in the sub-bands by the respective scale factor if they exceed a threshold value, coding the quantized data in the base layer, coding the quantized data in the enhancement layer, truncating the quantized data in the enhancement layer up to respective layer size limits, de-shifting the coded data wit the respective scale factors, de-quantizing the coded data, and decoding the coded data.

The invention relates to an optical fiber laser chaos laser ranging device and relative method. It is characterized in that: the chaos optical fiber laser uses the optical fiber laser to generate chaos laser signal, and via the optical fiber coupler II to divide the chaos laser signal into the detecting light I and the reference light II; the detecting light I via the optical fiber amplified is amplified to irradiate the object via the laser collimate system; the reflective wave signal of object is collected by the telescope and transformed into electric signal via the optical electric detector I; then via A / D converter, the analogue signal is transformed into digital signal to be input into computer; the reference light II directly irradiates the optical electric detector II whose properties are same to the optical fiber amplifier, to transform the optical signal into electric signal, then via the A / D converter, to be transmitted to the adjustable electric delay wire to be input into the computer; then attaining the detected distance. The invention uses the chaos laser signal generated by the optical fiber laser to range, uses the cross-correlation character of chaos laser to extract the laser fly time, with high anti-disturb ability, high noise tolerance, high accuracy and wider detecting range.

The invention discloses a VMD and CNN-based cable early fault identification and classification method. The method comprises the following steps: step 1, obtaining a to-be-tested analog signal; step 2, selecting a bandwidth limiting factor alpha, a noise tolerance tau and a mode decomposition number K as parameters, and setting parameter values; step 3, performing variational mode decomposition onvarious analog signals, obtaining each mode and the center frequency thereof, and realizing frequency band division; step 4, extracting decomposition modal features and constructing feature vectors;step 5, inputting various signal feature vectors into the convolutional neural network, carrying out parameter modulation training and obtaining a classification result. By using the method, early faults and over-current disturbance of the cable can be accurately distinguished, cable maintenance is completed in time before the early faults become permanent faults, and stable operation of a power grid is maintained.

There is offered a signal processing device of touch panel using an electrostatic capacity, which realizes improvement in noise tolerance and linear detection. An excitation pad, a first touch pad and a second touch pad are disposed on a substrate in a way that the excitation pad is interposed between the first and second touch pads. On the other hand, an alternating current power supply that provides the excitation pad with an alternating voltage through a wiring is provided on a sensor IC side of the signal processing device of touch panel. Also, there is provided an electric charge amplifier. The first touch pad is connected to a non-inverting input terminal (+) of the electric charge amplifier through an wiring, while the second touch pad is connected to an inverting input terminal (−) of the electric charge amplifier through a wiring.

The invention relates to a Chinese character writing learning method based on track imitation, wherein the method belongs to the fields of artificial intelligent and robot learning. According to the method, imitation learning based on track matching is introduced into studying of a robot writing skill; demonstration data are coded through a Gaussian mixture model; track characteristics are extracted; data reconstruction is performed through Gaussian mixture regression; a generalized output of the track is obtained; and furthermore learning of a track-continuous Chinese character writing skill can be realized. An interference problem in the writing process is processed in a method of multiple demonstrations, and noise tolerance of the method is improved. According to the method, multitask expansion is based on the basic Gaussian mixture model; a complicated Chinese character is divided into a plurality of parts; track coding and reconstruction are performed on each divided part; and the method is applied for generating discrete tracks, thereby realizing writing of track-discontinuous Chinese characters. The Chinese character writing learning method realizes high Chinese character writing generalization effect.

A system is disclosed for detecting and calculating the level of ambient and / or environmental noise, such as electromagnetic interference generated by electric power lines, ambient lights, light dimmers, television or computer displays, power supplies or transformers, and medical equipment. In some embodiments, the system performs frequency analysis on the interference signal detected by light photodetectors and determines the power of the interference signal concentrated in the analyzed frequency bands. The worst-case interference level can be determined by selecting the maximum from the computed power values. In some embodiments, the determined interference signal power can be compared with the noise tolerance of a patient monitoring system configured to reliably and non-invasively detect physiological parameters of a user. The results of the comparison can be presented to the user audio-visually. In some embodiments, the system can be used to perform spot check measurements of electromagnetic interference.

The invention discloses a switching method utilizing a fuzzy prediction model. According to the method, through introducing the fuzzy prediction model, reception signal intensity and the position of a user are predicted, excellent noise tolerance capability is realized, the relatively accurate prediction result can be acquired; through introducing short-period prediction of reception signal intensity of the user in a switching mechanism, a switching target base station and switching opportunity can be determined, and call drop caused by triggering time delay can be avoided; through introducing long-period prediction of the user position in the switching mechanism, locus of the user can be determined, and the ping-pong effect caused by short-period prediction restrictions can be avoided. The method is advantaged in that through introducing the fuzzy prediction model, reception signal intensity and the position of the user are predicted, according to the prediction result, switching opportunity and the target base station are determined, a prediction switching decision mechanism compatible with switching mechanisms in the prior art are employed, and seamless network switching is realized.

The invention discloses a real-time noise reduction system of an accelerometer and a gyroscope. The real-time noise reduction system comprises an inert measurement unit, an information processing unit and a navigation computer, wherein the inert measurement unit is used for extracting the measurement information of the accelerometer and the gyroscope information and transmitting the information to the processing unit for performing real-time noise reduction processing, and finally the navigation computer is used for utilizing processed measurement information and outputting the navigation information. The invention further discloses a real-time noise reduction method of the accelerometer and the gyroscope, the real-time noise reduction method comprises the following steps: establishing a single input single output kalman filtering equation and an observation equation of the accelerometer and the gyroscope, and performing online adjustment on kalman filtering gain matrix and an observation noise tolerance matrix according to the mechanical situation to realize the noise reduction treatment for the measurement information of the accelerometer and the gyroscope by utilizing the working characteristics of the kalman filter, so that the random measurement noise can be effectively reduced, and the good measurement precision of the accelerometer and the gyroscope under movable and static environments can be achieved by online adjustment of the filtering parameters.

A Method for Interpreting Seismic Data Using Duplex Waves is described. Whereas substantially horizontal boundaries are readily identified using conventional processing methods based on primary reflections, it has been difficult or impossible to use such methods for locating substantially vertical events or boundaries. The method of the present invention uses secondary reflections to locate substantially vertical events by gathering common source or receiver traces for processing. Wave fields of these gathers are continued downward to the level of the base boundary, then at each discrete depth level, a seismic image of sub-vertical events is formed. The downward-continued gathers correspond to the travel time of the wave from when it left the source or the receiver point, was reflected from the base boundary, and arrived to the corresponding point of the discrete level of wave-field continuation. In order to increase the noise tolerance of the resulting image of the target sub-vertical event—seismic images, obtained from the common source and receiver gathers, may also be summed together or stacked.

A method and apparatus for enhancing noise tolerance in dynamic Silicon-On-Insulator (SOI) logic gates improves the performance of dynamic gates using SOI technology. In particular implementations of logic, the logic inputs can be used to enable a pull-up chain constructed from a plurality of transistors. This pull-up chain holds the preset voltage on the summing node of the dynamic logic gate while the logic inputs are in a combination where parasitic bipolar transistors in the input logic chains conduct. The pull-up chain prevents spurious operation of the logic gate due to the conduction of the parasitic bipolar transistors. The pull-up also prevents spurious operation due to charge sharing that occurs when a device in the logic chain is enabled while another device is disabled. The charge sharing occurs due to charging the diffusion capacitance of the device which is disabled.

The invention provides an all-digital demodulation method based on an open loop structure. The receiver firstly filters out-of-band noise of an obtained digital baseband signal through a matching filter, detects a burst signal on the basis of a double-sliding-window algorithm; an O & M algorithm is adopted to complete timing error estimation of the burst signal, controls a cubic interpolation filter to carry out interpolation operation on the obtained sample value through a timing error; and performs cross-correlation operation on the signal after timing synchronization and a local synchronization code element to complete frame synchronization and eliminate a frequency offset error, and finally, removes phase offset through a phase offset estimation algorithm based on a maximum likelihoodcriterion to complete stripping of a carrier, thereby obtaining a recovered baseband signal. The sampling rate is reduced, and the calculation complexity is reduced. The method is simple, the demodulation effect is good, the noise tolerance is high, and the reliability and efficiency of burst signal demodulation are improved.

The invention discloses a novel 12-tube SRAM (Static Random Access memory) unit circuit capable of simultaneously increasing read noise tolerance and writing margin, and the novel 12-tube SRAM unit circuit can eliminate a partial-select problem and solve a read partial-select problem and a writing partial-select problem, a stability problem cannot be caused, and additionally, no additional power is consumed. Experiments measure that compared with a traditional 6T unit, the read dynamic power consumption and the writing dynamic power consumption of an array with the total number of 128 are respectively reduced by 81.3% and 88.2% when a column decoding unit (CMUX) is 4; additionally, according to the circuit, the read noise tolerance is greatly increased, so that the read noise tolerance is similar to the noise tolerance in a hold mode and reaches 2.3 times of that of the traditional 6T unit; in addition, according to the circuit, a feedback structure of a phase inverter is interrupted, so that the writing margin is increased and reaches 1.41 times of that of a traditional 6T SRAM unit.

A method for adjusting a DC offset slice point in an RF receiver is provided and may comprise estimating DC offset using a combination of fast tracking of an input signal and slow tracking of an input signal. If both are used, the fast tracking may be executed prior to executing the slow tracking. The fast tracking may acquire synchronizing signals transmitted before a payload. Additionally, noise tolerance may be increased in the fast tracking and the slow tracking by using tracking envelopes. The fast tracking may average acquisition envelopes and tracking envelopes using a fast tracking weighting factor to a sum of the acquisition envelopes and a slow tracking weighting factor to a sum of the tracking envelopes. Additionally, the slow tracking may average the tracking envelopes.

The invention provides an environment light inspecting system and a method; the system mainly comprises a light inspecting circuit used for executing a light inspection program to generate light inspection signals, an integral period control circuit used for generating control signals according to the light inspection signals, and an integral circuit used for regulating integral period according to the control signals and executing integral program for the light inspection signals in the regulated integral period so as to read signals. The invention also provides an environment light inspection method, mainly including the steps of providing a plurality of integral periods, executing the light inspection program to generate the light inspection signals, selecting integral periods from the plurality of integral periods according to the light inspection signals and executing integral programs for the light inspection signals in the selected integral period. The invention can avoid the problems that environment illumination cannot be distinguished, for the read signals with saturation voltages are generated and the noise tolerance is reduced as the read signals have a low voltage. The invention is suitable for inspecting environment illumination in a wide range.

There is described a method for designing a circuit having a plurality of thermally mutable electrical components having different power dissipation and noise tolerance requirements, the method comprising: identifying a desired value for said noise tolerance and said power dissipation for each of said plurality of components; selecting a parameter value for each of said plurality of components; and selecting a dimension for each of said plurality of components as a function of said power dissipation and noise tolerance requirements to yield a trimmable range including said parameter value.

A system and method for increasing the accuracy of time delay estimates of signals propagating through an environment. The system includes one or more sensors for receiving a plurality of signals, and a time delay estimator for measuring time delays between multiple pairs of signals. At least some of the multiple pairs of signals are received and measured at different points in time. The system further includes a data analyzer for analyzing time delay estimation data, for generating a statistical distribution of time delay estimates from the data, and for calculating a statistical estimate of time delay from the distribution. By increasing the number of signals employed by the system, the accuracy of the time delay estimation is increased. Further, by calculating the median or the mode of the statistical distribution, noise tolerance is improved. The signals employed by the system may include sonar signals, seismic signals, ultrasonic signals, acoustic signals, electromagnetic signals, or any other suitable type of signals.

An integrated circuit ('IC') may include circuitry for use in testing a serial data signal. The IC may include circuitry for transmitting the serial data signal with optional jitter, optional noise, and / or controllably variable drive strength. The IC may also include circuitry for receiving the serial data signal and performing a bit error rate ('BER') analysis in such a signal. The IC may provide output signals indicative of results of its operations. The IC can operate in various modes to perform or at least emulate functions of an oscilloscope, a bit error rate tester, etc., for testing signals and circuitry with respect to jitter-tolerance, noise-tolerance, etc.

The invention discloses a novel superconducting cyclotron tuning system. An analog IQ (in-phase and quadrature) phase detection module is used for modulating sine I and cosine Q of phase differences of LO (local oscillation) and RF (radio frequency) signals, and the modulated signals are used as input signals for an analog IQ phase detection calibration module; the analog IQ phase detection calibration module is used for calibrating measurement errors of the analog IQ phase detection module and provides real-time detection for the analog IQ phase detection module; after completing calibration,the analog IQ phase detection module is automatically turned off, and the influence of the analog IQ phase detection calibration module on analog IQ phase detection results is avoided. The combination technique of an analog signal processing system and a digital signal system is used herein, providing improved tuning precision and noise tolerance for the system and reduced time delay for a feedback system that is caused by signal processing; the analog IQ phase detection calibration module in the system of the invention provides improved self-adjusting capacity and extended applicable range for the analog IQ phase detection module.

The invention discloses a subthreshold SRAM (Static Random Access memory) unit circuit capable of increasing read noise tolerance and writing margin, first PMOS transistor MP1, first NMOS transistor MN1, third NMOS transistor MN3 and third PMOS transistor MP3 form a first inverter, second PMOS transistor MP2, second NMOS transistor MN2, fourth NMOS transistor MN4 and fourth PMOS transistor MP4 form a second inverter, the first inverter and the second inverter are used for storing opposite data, namely data of memory point Q and memory point QB; seventh NMOS transistor MN7 and eighth NMOS transistor MN8 are used for controlling read operation, the third NMOS transistor MN3, the third PMOS transistor MP3, the fourth NMOS transistor MN4 and the fourth PMOS transistor MP4 are used for improving writing capability. The SRAM (Static Random Access memory) unit circuit improves the ability of writing data, a new writing operation method is used, so that the data is easy to write in a unit, the write margin is greatly improved; meanwhile, the unit circuit adopts a read-write separation structure, so that the read noise tolerance reaches to the maximum, and the unit circuit can works in a subthreshold zone, and reduces power consumption.

This invention makes it possible to reduce a power consumption of an electronic circuit (microcomputer, for example) while preventing malfunctioning of an oscillator by appropriately setting a power supply impedance of a low frequency oscillator corresponding to an operation mode. A high frequency oscillator, a medium frequency oscillator and a low frequency oscillator are provided as sources of system clocks. In addition, there is provided a quartz oscillator to generate a clock for a timepiece. When the high frequency oscillator is in operation, a power supply impedance of the quartz oscillator is reduced to improve a noise tolerance. In a waiting period during which the high frequency oscillator, the medium frequency oscillator and the low frequency oscillator are halted, on the other hand, the power supply impedance of the quartz oscillator is increased to suppress the power consumption.

A system and method for increasing the accuracy of time delay estimates of signals propagating through an environment. The system includes one or more sensors for receiving a plurality of signals, and a time delay estimator for measuring time delays between multiple pairs of signals. At least some of the multiple pairs of signals are received and measured at different points in time. The system further includes a data analyzer for analyzing time delay estimation data, for generating a statistical distribution of time delay estimates from the data, and for calculating a statistical estimate of time delay from the distribution. By increasing the number of signals employed by the system, the accuracy of the time delay estimation is increased. Further, by calculating the median or the mode of the statistical distribution, noise tolerance is improved.

A number of different dynamic circuits having improved noise tolerance and a method for designing same are provided. The circuits include a power supply node and a precharge node. Keeper circuitry is connected to the nodes and has a current-voltage characteristic that exhibits a negative differential resistance property to improve noise tolerance of the circuits.

A method for laying out decoupling cells in a semiconductor integrated circuit including a plurality of paths. The method includes extracting from a timing analysis result a timing slack amount as a timing margin for power supply noise in one of the paths serving as a target path, converting the extracted timing margin to a noise tolerance amount, comparing the noise tolerance amount and a power supply noise amount of the target path, and determining whether or not a decoupling cell must be additionally laid out in the target path based on the comparison result.

A memory cell with a small surface area is fabricated by forming source lines and data lines above and below and by running the channels to face up and down. The local data lines for each vertically stacked memory cell are connected to a global data line by way of separate selection by a molecular oxide semiconductor, and use of a large surface area is avoided by making joint use of peripheral circuits such as global data lines and sensing amplifiers by performing read and write operations in a timed multiplex manner. Moreover, data lines in multi-layers and memory cells (floating electrode cell) which are non-destructive with respect to readout are utilized to allow placement of memory cells at all intersecting points of word lines and data lines while having a folded data line structure. An improved noise tolerance is attained by establishing a standard threshold voltage for identical dummy cells even in any of the read verify, write verify and erase verify operations. A register to temporarily hold write data in a memory cell during writing is also used as a register to hold a flag showing that writing has ended during write verify. Also, a circuit comprised of one nMOS transistor is utilized as a means to change values on the write-end flag.