201 results about "Linear component" patented technology

The systems and methods of the present invention utilize a linear component of a non-linear, faradaic current response generated by a biological fluid sample when an AC excitation potential sufficient to produce such a faradaic current response is applied to the sample, in order to calculate the concentration of a medically significant component in the biological fluid sample. The current response is created by the excitation of electrochemical processes within the sample by the applied potential. Typically, the linear component of the current response to an applied AC potential contains phase angle and/or admittance information that may be correlated to the concentration of the medically significant component. Also typically, the fundamental linear component of the current response is utilized in the disclosed systems and methods. Harmonics of the fundamental linear component may also be used. Other methods and devices are disclosed.

A transmitter channel interference mitigation processing method for cancellation of intermodulation products are described. In one embodiment, a method comprising generating continuous and real time IMP cancellation signals (ICS) in the baseband digital signal set of the transmitter based on a transmitter signal set, combining digital IMP cancellation signals with a digital baseband transmitter signal set such that the digital cancellation signals, when converted to analog signals and transmitted as part of an analog transmitter signal set, are cancelled by and so cancel the IMPs generated by the non-linear components in the analog transmitter hardware, including digitally generating the IMP cancellation signals using a process based on a power series description of a non-linear process generating the IMPs, generating 3^rd order IMP cancellation signals by digitally multiplying two or three signals of the transmitter signal set to create 3^rd order IMP cancellation signals, generating 5^th order IMP cancellation signals by digitally multiplying two or three or five signals of the transmitter signal set to create 5^th order IMP cancellation signals, generating 7^th order IMP cancellation signals by digitally multiplying two or three or five or seven signals of the transmitter signal set to create 7^th order IMP cancellation signal, generating odd order IMP cancellation signals (ICS) by digitally multiplying an odd number of digital signals and combining multiplied digital signals with the transmitter baseband digital signals, creating IMP cancellation signals in the receiver, and cancelling one or both of active and passive IMPs generated in a transmitter path that fall within a receiver passband.

A SLAM of a robot is provided. The position of a robot and the position of feature data may be estimated by acquiring an image of the robot's surroundings, extracting feature data from the image, and matching the extracted feature data with registered feature data. Furthermore, measurement update is performed in a camera coordinate system and an appropriate assumption is added upon coordinate conversion, thereby reducing non-linear components and thus improving the SLAM performance.

Systems and/or methods provide for ultrasound imaging through the use of a dynamic non-linear post-beamforming filter (e.g., based on a pth-order Volterra model) capable of separating the linear and non-linear components of image data. A coefficient identification algorithm for deriving coefficients for filter is also provided.

At Step 602, the grid of a wafer loaded into an exposure apparatus is approximated by a mathematical function fitting up to, for example, a cubic function, and at Step 612, the magnitude of a residual error between the position of a sample shot area obtained by the function and an actually measured position is compared with a predetermined threshold value. GCM measurement is performed in a mathematical function mode in a subroutine 616, or it is performed in a map mode in a subroutine 616, on the basis of the result of the comparison. In addition, it is determined whether to extract non-linear components from the wafer in each lot on the basis of a variation in the temperature of the wafer (Step 622) and a variation in random error between the wafers (Step 624).

In accordance with one embodiment of the invention, a path planner and method for planning a path of a vehicle defines a reference row having a reference contour in a work area. A representation of the defined reference row is established. The defined reference row comprises a curved component, a generally linear component, or both. A generator generates one or more contour rows with a tracking contour that tracks or mirrors the reference contour based on a vehicular width and a radius difference parameter associated with the curved component. The contour rows are generated by a translation technique for the generally linear component and a radius modification technique for the curved component.

An audio processing system is provided for controlling the acoustics of a loudspeaker-room system. The loudspeaker-room system having a listening room and loudspeakers located in said listening room, and transfer functions with linear and non-linear components. The audio processing system comprises a compensator with a transfer function for obtaining at least two compensated signals from the input signals. The transfer functions of the compensator may include linear and non-linear components and are inverse to the transfer functions of the loudspeaker-room system to the extent that a desired overall transfer function is established.

A mixer for use in a direct conversion receiver includes a compensating differential amplifier which injects equal amplitude opposite phase currents with respect to even order distortion currents. The compensating differential amplifier utilizes an ideal current source. The mixer is an active mixer which utilizes four switching transistors. The even order distortion is introduced by non-linear components which demonstrate strong off-channel signals.

Pre-distortion apparatuses and methods for a non-linear component are provided. The apparatus comprises an adaptive block for generating a plurality of correlation coefficients, which are used to weight a plurality of synthesis work functions to pre-distort a given signal. The adaptive block can be driven by an error signal generated from a feedback signal from the non-linear component output signal and a delayed version of the input signal. The apparatus is capable of being operated directly at radio frequency. Also provided are apparatuses and methods for generation of quadrature signals, transconductance amplification employing negative resistance, variable-gain amplification, and envelope detection.

An image matching method capable of matching images with a high precision and a program and an image matching system for the same, providing a conversion unit for performing image processing based on a registered image and a match image for converting points in each image to patterns of curves based on a distance from a reference position to the closest point on a straight line passing through each point in the image from the reference position and an angle formed by a straight line passing through the reference position and the closest point and an x-axis as a reference axis including the reference position, converting linear components in the images to patterns of a plurality of overlapped curves, and generating converted images, a correlation value generation unit for performing correlation processing based on the converted images and generating a correlation value, and a matching unit for performing the matching based on a signal indicating the correlation value generated by the correlation value generation unit.

A system and method is disclosed for tracking a moving object using magnetic resonance imaging. The technique includes acquiring a scout image scan having a number of image frames and extracting non-linear motion parameters from the number of image frames of the scout image scan. The technique includes prospectively shifting slice location using the non-linear motion parameters between slice locations while acquiring a series of MR images. The system and method are particularly useful in tracking coronary artery movement during the cardiac cycle to acquire the non-linear components of coronary artery movement during a diastolic portion of the R—R interval.

A method of using music detection to enhance an operation of an echo canceller is provided, wherein the echo canceller includes an adaptive filter and a nonlinear processor. The method comprises receiving an input signal including an echo signal by the echo canceller from a near end device, filtering the input signal using the adaptive filter to eliminate linear components of the echo signal in the input signal and generate an error signal, analyzing the error signal using a music detector to determine existence of a music signal in the error signal, bypassing the nonlinear processor if the analyzing determines the music signal exists in the error signal, and eliminating nonlinear components of the echo signal from the error signal using the nonlinear processor if the analyzing determines the music signal does not exist in the error signal.

A region of interest extracting section automatically extracts regions of interest from within original images by obtaining the degree by which the features of portions within the original images differ from the features of surrounding portions, based on the colors of the original images, brightnesses of the original images, and the orientations of linear components that appear in the original images. A partial image generating section generates partial images by cutting out images of predetermined sizes that include the regions of interest, which are extracted by the region of interest extracting section, from the original images. The generated partial images are displayed.

A micromechanical pressure sensor device, particularly for measuring low absolute pressures and/or small differential pressures. The device includes a frame that is formed at least partially by a semiconductor material, a membrane retained by the frame, at least one measuring resistor that is disposed at a first location in or on the membrane and whose resistance value is a function of pressure-induced mechanical stresses in the membrane, and at least one compensating resistor that is disposed at a second location in or on the membrane and whose resistance value is a function of pressure-induced mechanical stresses in the membrane. The resistance value changes at the first location with a first linear component and a first quadratic component as a function of the pressure, and the resistance value changes at the second location approximately without a linear component and with a second quadratic component, which is proportional to the first quadratic component, as a function of the pressure.

Positional information (an estimate value in which a linear component of positional deviation amount is corrected) of each shot on a wafer is calculated by a statistical computation using actual measurement values of positional information of a plurality of sample shots on the wafer (step 488). And, a variation amount of a non-linear component of positional deviation amount is calculated at predetermined intervals with respect to each of a plurality of measurement shots including the sample shots (step 496), and judgment is made about the necessity of update of correction information based on magnitude of the calculated variation amount of a non-linear component of each measurement shot area (step 498). Therefore, comparing with the case when actual values of positional information of all shots on the wafer are obtained at least once in each lot in order to update a correction value, the number of shots subject to positional information measurement and the measurement time can be reduced without fail.

The invention provides a loudspeaker nonlinear system identification method comprising the steps of providing an amplified excitation signal for a loudspeaker system to be tested; synchronizing a voltage signal and current signal on both ends of the loudspeaker system; acquiring a linear parameter of the loudspeaker system: according to the measured voltage signal and the measured current signal, computing the impedance curve of the loudspeaker system on a large signal condition, and matching the impedance curve by using a least square method so as to obtain the linear parameter of the loudspeaker system; acquiring the nonlinear parameter of the loudspeaker system: inputting the measured current signal into the lumped parameter model of the loudspeaker system to compute an estimated voltage signal; comparing the estimated voltage signal with the measured voltage signal and computing a voltage error signal between the estimated voltage signal with the measured voltage signal; de-correlating the voltage error signal in order remove the linear component in the voltage error signal, and acquiring the nonlinear parameter by an adaptive iteration algorithm according to the de-correlated voltage error signal.

The invention relates to an integrated circuit and discloses a current reference source circuit and a method for generating a current reference source. The method comprises the following steps of: generating a linear positive temperature coefficient current, a nonlinear negative temperature coefficient current and a nonlinear positive temperature coefficient current through three circuits respectively; superimposing the three currents; and taking the superimposed output currents as the current reference source. The linear positive temperature coefficient current is used for effectively offsetting linear components in the nonlinear negative temperature coefficient current, and the nonlinear positive temperature coefficient current is used for compensating residual nonlinear negative temperature coefficients, so that the sensitivity of the acquired currents to temperature changes is further reduced, and the current reference source which approximates to a zero temperature coefficient can be realized.

An apparatus for measuring at least one of an arrangement and shape of shots formed on a substrate, comprises a scope configured to obtain an image of an alignment mark corresponding to a shot; and a calculating device configured to calculate a difference between a position of the alignment mark in the image obtained by the scope and a designed position of the alignment mark, obtain a non-linear component of the calculated difference with respect to each of a plurality of conditions, calculate an index indicating a stability of the non-linear component of each shot with respect to each of the plurality of conditions, and select, from the plurality of conditions, a condition for obtaining the non-linear component based on the calculated indices.

There is provided an adjustable integral component in a feedback loop of a closed loop control system. The closed loop control system controls an output signal of an electric generator. The adjustable integral component provides an integral signal. The integral signal is proportional to the output signal in a first operational mode. The integral signal is proportional to a time integral of an output signal in a second operational mode. According to another aspect of the invention there is provided a non-linear component in a feedback loop of a closed loop control system. The closed loop control system controls an output signal of an electric generator. The electric generator having non-linear characteristics. The feedback loop has an error signal, of which the output signal is responsive to. The non-linear component receives a load signal and provides a non-linear signal related to the non-linear characteristics of the electric generator. The error signal is responsive to the non-linear signal. According to another aspect of the invention, there is provided a method of controlling a system variable in a control system for an electric generator. The output signal of the electric generator is sensed and a sample signal is provided thereof. The sample signal is compared to be below a threshold value, and accordingly an adjustable impedance is adjusted to be substantially resistive. A proportional signal and integral signal that are proportional to the sample signal are provided. A time derivative is taken of the sample signal to provide a differential signal. An error signal is generated by providing a difference between a reference signal and a sum of the proportional signal, the integral signal and the differential signal. The output signal is then adjusted based on the error signal, by driving the output signal towards the set-point value. The sample signal is then compared to be above the threshold value, and accordingly the adjustable impedance is adjusted to be substantially capacitive. The integral signal now being representative of a time integral of the sample signal.

The method includes following steps: (1) through simulated down converter, broadband multicarrier input signal forms intermediate frequency signal; (2) through simulated up converter, predistortion component is sent to power amplifier to counteract non-linear component generated by power amplifier; the said predistortion signal is controlled based on offset of error between envelope signal and digital feedback signal of reflecting linearity of transmission channel. Using scheme of self-adaptive radio nonlinear digital predistortion based on radial basic neural network, the invention reduces implementing complexity greatly, possesses features of higher linearity, and easy of implementation.

A method for residual echo suppression is provided. Embodiments may include receiving an original reference signal and applying a distortion function to the original reference signal to generate a second signal. Embodiments may include generating a non-linear signal from the distortion function that does not include linear components of the original reference signal. Embodiments may also include calculating a residual echo power of a linear component and a non-linear component, wherein the linear component is based upon the original reference signal and the non-linear component is based upon the non-linear signal. Embodiments may further include applying a room model to each of the original reference signal and the non-linear signal and estimating a power associated with the original reference signal and the non-linear signal. Embodiments may include calculating a combined echo power estimate as a weighted sum of a weighted original reference signal power and a weighted non-linear signal power.

A method and system for controlling growth of a taper portion of a semiconductor single crystal based on the slope of the taper. A crystal drive unit pulls the growing crystal from a melt at a target pull rate that substantially follows an initial velocity profile for growing the taper. A controller calculates a taper slope measurement as a function of a change in crystal diameter relative to a change in crystal length. The controller then generates an error signal as a function of the difference between the taper slope measurement and a target taper slope and provides a pull rate correction to the crystal drive unit as a function of the error signal. In turn, the crystal drive unit adjusts the pull rate according to the pull rate correction to reduce the difference between the taper slope measurement and the target taper slope. The target taper slope is defined by a function having a generally exponential component and a generally linear component.

A computer-implemented method and device for determining a user position, implemented in a user handheld computing device programmed to perform the method. The method includes solving for the position of a user based on ranges, which are computed by estimating power loss between a user and a number of Wi-Fi Access Points. Embodiments of the present invention includes a method that is designed to accommodate the non-linear nature of solving a position solution using power estimates. This method includes solving a two-dimensional solution grid of position residuals, or magnitudes of error between true and computed ranges, using signal strength measurements from multiple Wi-Fi access points in order to determine local minima of the position residuals indicating a user position. Standard approaches in the area such as a Least Squares Solution overly simplify the non-linear components resulting in poor performance.