44 results about "Nonlinear signal processing" patented technology

A combined signal processing method for a source end and a relay end in a bidirectional relay system comprises the following steps: the source end emits a training sequence to a relay, and the relay performs backward channel estimation to obtain an estimation channel between the source end and the relay; the relay emits a training sequence to the source end, and the source end performs forward channel estimation to obtain an estimation channel between the relay and a user; the source end feed forward channel information back to the relay, the relay performs iterative computation to source end nonlinear pre-coding matrixes, relay linear pre-coding matrixes and source end receiving equalization matrixes; the relay feeds the information of the source end back to the source end; emitting signals are subjected to nonlinear pre-treatment through the source end and then emitted to the relay; the signals received by the relay are subjected to linear pre-treatment through the relay and then broadcasted to the source end; and the source end detects the received signals to obtain information required to be transmitted therebetween. According to the invention, the bidirectional relay information transmission mode is adopted to improve the channel capacity, and the nonlinear signal processing method is adopted at the source end, so that the bit error rate performance of the system is improved.

A sensor apparatus includes a sensor circuit and a nonlinear signal processing circuit. The sensor circuit detects a physical quantity and outputs a detection signal indicative of the detected physical quantity. The signal processing circuit includes a logarithmic converter, an analog-to-digital converter, and an antilogarithmic converter. The logarithmic converter produces a logarithm signal corresponding to a logarithm of the detection signal. The analog-to-digital converter digitalizes the logarithm signal. The antilogarithmic converter produces an antilogarithmic signal corresponding to an antilogarithm of the digitalized logarithm signal.

When a YUV signal is inputted to a signal processing circuit from the outside, a histogram detection unit detects a histogram of a single frame of the Y signal, a correlation determination unit determines a correlation between a gain and a level of an inputted Y signal on the basis of the histogram, and a YUV gain determination unit determines the gain. A Y gain multiplication unit and a UV gain multiplication unit multiply each of the inputted Y signal, U signal, and V signal by the same gain to correct the YUV signal. A YUV/RGB conversion unit converts the signal into an RGB signal, and outputs the result to a display element. In the display device, there is no change in color balance even when contrast correction and other nonlinear signal processing are performed.

In a method for monitoring the function of a sensor module, which has a sensor, by means of the sensor a measurement signal for a physical quantity to be determined is generated and applied to an output terminal in an unchanged form or in processed form—after at least one linear signal processing step and/or at least one nonlinear signal processing step are performed. In addition, a test signal is generated whose spectrum lies substantially outside the spectrum of the measurement signal. The test signal is supplied at a place in the sensor from which it reaches the output terminal in unchanged form or in processed form—after the performance of the at least one linear signal processing step—only in the case of a functional sensor. An output signal present at the output terminal is compared with the test signal and a diagnosis signal is generated, which indicates whether the test signal is present at the output terminal. The test signal is filtered out of the output signal and the remaining signal is applied as the measurement signal at a measurement signal output of the sensor module.

An electroencephalogram signal decoding method based on a deep convolutional generative adversarial neural network comprises: firstly, converting an electroencephalogram signal into a time-frequency domain image signal from a time sequence signal through short-time Fourier transform; and integrating the convolutional neural classification network and the adversarial generation network, performingdata enhancement on the small sample electroencephalogram data by using the adversarial generation network, putting the enhanced data into the convolutional neural classification network, and performing classification to realize decoding. The structural advantages of the convolutional neural classification network and the adversarial generative network are combined, the defects existing in small sample data processing through the neural network are overcome, the problems existing in the non-stationary and non-linear signal processing process are effectively solved, and the spontaneous electroencephalogram signal decoding precision is improved; and meanwhile, a new solution is provided for electroencephalogram signal data enhancement, and a new thought is provided for reducing the calibration time and improving the generalization ability of the classification model in the actual operation process in the future.

A multi-rate filter system is disclosed. More particularly, a computationally efficient multi-rate filter system for processing an audio stream on a consumer electronics device is disclosed. The multi-rate filter system includes a plurality of multi-rate filtering blocks, at least one block including a linear filter component. At least one multi-rate filtering block may include a nonlinear signal processing components. The multi-rate filter system may include a nonlinear functional block. A method of filtering a signal is also disclosed.

An on-chip reduced complexity modulation noise estimation mechanism for performing nonlinear signal processing to analyze modulation noise to determine whether a semiconductor device under test complies with the performance criteria set by specifications or a standard corresponding thereto. When used in a two-point transmitter modulation architecture, the mechanism relies on the fact that the noise statistics at the output of the transmitter can be determined by observing the phase error output of the phase detector within the phase locked loop. In the digital embodiment of the mechanism, the phase error signal is compared to a configurable threshold value to generate an exception event. If the number of exception events exceeds a configurable max_fail value after comparisons of a configurable number of phase error samples, the test fails. A pass/fail signal is output reflecting the result of the test. The test comprises a configurable number of test samples to permit flexibility in the tradeoff between the time required to complete the test versus the statistical reliability of the test result, i.e. the probability of it correctly determining whether the tested device complies with target specifications.

An image processing system according to an implementation of the invention includes a plurality of signal processing modules (210, 212, 214, 216, 218, 220, 222, 224, 226) inline in a data stream receiving signals. The signal processing modules include input multiplexers (234a-234i) adapted to control an order of or bypassing of processing by the signal processing modules. The signal processing modules may be implemented as hardware-based, nonlinear signal processing modules, such as log compress, decimation, compounding, blending, edge enhancement, automatic gain control, BHNS, lateral, or persistence filters.

A method and apparatus are provided for processing a received pulsed-based ultra-wideband (UWB) signal before the signal is demodulated by an energy detection based receiver. A nonlinear signal processing unit contains one or multiple subunits, and each subunit consists of a nonlinear device and a filter. The nonlinear devices can be any devices that can shift signal, noise, and interference spectra in a nonlinear fashion, and include but are not limited to square law devices and Teager-Kaiser operators. By applying the nonlinear signal processing unit on the received UWB signal, a major part of the energy of noise and narrowband interferences is shifted to specific frequency ranges and then removed by the appropriate filter(s) in the nonlinear signal processing unit. Thus, the signal-to-noise-plus-interference ratio (SNIR) of the received UWB signal can be improved.

The invention discloses a nonlinear slit optical waveguide and a preparation method and application thereof. The nonlinear slit optical waveguide comprises a slit optical waveguide body, the slit optical waveguide body comprises a monocrystalline silicon layer, and a slit waveguide is arranged on the monocrystalline silicon layer. The nonlinear slit optical waveguide further comprises a nonlinear enhancement layer for light to pass through, and the nonlinear enhancement layer covers the surface provided with the slit waveguide and fills a slit. The nonlinear slit optical waveguide has a high nonlinear effect, so that the requirement on input signal power can be remarkably reduced, the conversion efficiency of nonlinear signal processing and the output power of converted signals are improved, and the stability and flexibility of the signal processing process are further improved. The process conditions of the preparation method of the nonlinear slit optical waveguide are easy to control, so that the prepared nonlinear enhancement layer is high and stable in quality, the nonlinear enhancement effect of the prepared nonlinear slit optical waveguide is stable, and the efficiency is high.

The invention discloses a semi-physical simulation method of a microwave photon array signal processing system. An antenna unit is drawn into a computer domain for simulation, and real object measurement is carried out on a microwave photon signal processing branch. The method comprises a first step of generating an excitation signal set of each microwave photon signal processing branch in the computer according to the class of the microwave photon array signal processing system to be simulated; a second step of actually measuring the response of each microwave photon signal processing branchunder the corresponding excitation signal according to the excitation signal set; a third step of fusing the response of the microwave photon signal processing branch under the corresponding excitation signal into a simulation result of the microwave photon array signal processing system in the computer. The invention further discloses a semi-physical simulation device of the microwave photon array signal processing system. According to the method and device, various linear and non-linear signal processing functions under the broadband can be supported, and the experiment research difficulty of the system is reduced while the high simulation reliability is guaranteed.

The invention provides a riser vortex induced vibration monitoring method based on stochastic resonance. A monitoring system is arranged on the riser, and the vibration signals of the riser are acquired. Through a nonlinear signal processing unit-stochastic resonance system, signal processing is firstly carried out; then, through spectrum analysis, the riser vortex induced vibration frequency is obtained; and further, whether vortex induced vibration happens is judged. The riser vortex induced vibration frequency is detected from a complex ocean noise background, and the monitoring performance of the monitoring system is improved.

The invention relates to a method for all-optically generating a sextuple frequency high-speed millimeter wave and belongs to the technical field of optical communication. The method comprises the following steps: mutually cascading two standard Mach-Zehnder modulators; respectively driving the two standard Mach-Zehnder modulators by low-speed radio frequency signals; respectively choosing offset points of the two standard Mach-Zehnder modulators as the highest point and the lowest point of a transmission curve; and simply controlling amplitudes and phases of radio frequency driving signals of the two standard Mach-Zehnder modulators, thereby acquiring the high-speed millimeter wave, the repeated frequency of which is sextuple frequency of the radio frequency signals. According to the method provided by the invention, a linear optical frequency multiplying process is used for generating the millimeter wave which has excellent spectrum purity and phase coherence. Expensive high-speed photoelectric element and complex nonlinear signal processing process are unnecessary according to the method, thereby greatly lowering the configuration cost and simplifying the system structure. If a high-speed element is adopted while the system structure is unchanged, the frequency band can be easily increased to above 100GHz. The method has wide application prospect in future wireless wideband communication.

A method for enlarging the interference-free dynamic range of non-linear signal-processing components in receiver systems, in the conversion of input frequencies f_in into output frequencies f_out. According to the invention, at least one linear combination of at least one input frequency f_in,t, f_in,b and a fixed, predetermined oscillator f_LOn of the components is calculated from the output signal of the component, for at least one output frequency f_out,s, f_out1,s, f_outs,2, which combination is compared with any desired output frequency f_out,t of the component, whereby the output frequency f_out,s, f_out1,s, f_outs,2 is then recognized as a spur and eliminated from the output signal of the component, if the calculated linear combination corresponds to any desired output frequency f_out,t of the component, within a frequency and power range that can be predetermined.