39 results about "Waveform observation" patented technology

In a method of detecting a repetition frequency of a measured signal, in order to detect the waveform repetition frequency of the measured signal with high accuracy even in the presence of a frequency fluctuation in the measured signal, the repetition frequency of the measured signal acquired by the conventional method is used as a provisional repetition frequency, and the frequency change amount of the specified signal obtained in the case where the measured signal is sampled sequentially with a sampling frequency greatly changed from the provisional sampling frequency to generate a frequency fold at the time of sampling is detected. Based on the detected frequency change amount of the specified signal and the change amount of the sample number indicating how many times the frequency fold has occurred in the process, the error contained in the sampling number with a frequency fluctuation contained in the measured signal is calculated. Then, based on the error contained in this sample number, the provisional repetition frequency of the measured signal is corrected, thereby calculating the regular repetition frequency of the measured signal.

A waveform input circuit, waveform observation unit and semiconductor test apparatus allow to faithfully observe waveform of a device under test with high output impedance and low load driving capability. A waveform input circuit includes a high input impedance terminating resistance which receives an input signal from a transmission line, a relay which selects a terminating resistance, an input buffer which is connected when the high input impedance terminating resistance is selected. A reference potential switch is further provided to select a reference potential of the transmission line where one reference potential is controlled to be in phase with the input signal by an input buffer which is connected when the high input impedance terminating resistance is selected.

The present invention discloses a method for analyzing a state of a power supply network of an integrated circuit in real time. The method comprises: 1, according to power supply routing of an integrated circuit layout, extracting a resistance-capacitance network and forming a power supply network model in a spice format; 2, setting up a power supply unit by utilizing a power supply module in the integrated circuit, and forming a power supply model in a spice format; 3, based on integral circuit simulation, extracting a dynamic power consumption state of each module in the integrated circuit to form a power consumption model; 4, based on the power supply network model and the power supply model, setting up a top layer simulated circuit, wherein the power supply model is connected to a power supply node, and the power consumption model is connected to a power consumption node; and 5, carrying out simulation on the top layer simulated circuit by utilizing a spice tool, and carrying out waveform observation on different nodes to know the state of the power supply network in real time. According to the method disclosed by the present invention, a pressure drop of each node of the power supply network can be accurately analyzed, so that advantages and disadvantages of power supply signal routing can be analyzed, or the pressure drop of each node is used as judgment basis of regulating the number and positions of power supply units.

The invention discloses a system for processing animal gastrointestinal mobility signals. The system comprises a data collection unit and a data processing unit. The data processing unit comprises a preprocessing unit, a baseline drift removing unit, an abnormal data identifying and removing unit, a contraction cycle positioning unit and a gastrointestinal dynamic calculating unit. The invention further discloses a method for processing the animal gastrointestinal mobility signals. The method includes the steps of data collection, preprocessing, baseline drift removal, abnormal data identification and removal, contraction cycle positioning and gastrointestinal dynamic calculation. By the system and the method, existing low efficiency and inaccuracy in manual waveform observation and manual calculation of gastrointestinal dynamics indexes such as wave number, amplitude and dynamic index are changed, and calculation speed of each gastrointestinal mobility performance index can be greatly improved.

The invention provides a multi-channel signal multiplexing device, which includes a multi-channel active probe, a multi-channel signal conditioning circuit and a signal selection circuit; the multi-channel active probe sends the measured multi-channel signals to the In the multi-channel signal conditioning circuit, the multi-channel signal after conditioning is divided into two groups, one group is output to the digital signal acquisition channel, and one group is output to the signal selection circuit; the signal selection circuit selects the input multi-channel signal, and the One or more signals are sent to the analog signal acquisition channel. The invention makes it possible to conveniently and synchronously observe the logic sequence and waveform of a plurality of digital signals without moving the connection position of the probe during the test, the synchronization of the signal observation can be better guaranteed, and the test speed is improved.

The invention discloses a digital oscilloscope capable of displaying an arithmetical operation result. The digital oscilloscope comprises a channel vertical gear selection knob, a measuring channel, an input unit, an arithmetical operation vertical gear selection knob and a display unit, wherein the channel vertical gear selection knob is used for generating vertical gear information of a measured channel; the measuring channel is used for acquiring a measured waveform according to the vertical gear information; the input unit is used for inputting an arithmetical operation formula; the arithmetical operation vertical gear selection knob is used for generating vertical gear control information of the operated waveform; and the display unit is used for setting a vertical gear of a display window and displaying the measured waveform and the operated waveform corresponding to the operation formula in the display window according to the vertical gear control information of the operated waveform, and setting a maximum vertical gear and a minimum vertical gear of the display window according to the vertical gear information of the measured channel and the arithmetical operation formula. According to the oscilloscope, a gear scope of a high level arithmetic function is determined automatically according to the operation formula; compared with the prior art, a large number of useless gears are removed, and the automatically determined gear scope more facilitates waveform observation of a user.

The invention discloses an FPGA (Field Programmable Gate Array)-based STDP (Spike Timing-dependent Plasticity) synaptic plasticity experimental platform under feedforward neural network. The experimental platform comprises an FPGA development board and an upper computer which are connected with each other, wherein the FPGA is taken as a lower computer and is provided with a human-machine operation interface programmed by C++ to perform synaptic strength connection change waveform and dynamical characteristic observation and parameter setting; the FPGA is used for implementing a mathematic model, and applying an external stimulate signal to a multilayer feedforward neural network and a synaptic connection model; the upper computer is applied to dynamics analysis such as parameter adjustment, synaptic change waveform observation, synaptic adaptive change and the like. The FPGA-based STDP synaptic plasticity experimental platform has the effects that on the basis of a high-speed operation FPGA neural synaptic plasticity computation platform, hardware modeling relative to a synaptic plasticity part among phenotype nerve cells is realized through a non-animal experiment of biological neural synaptic connection, the learning process can be stabilized effectively, and the consistence with real neuronal synapse plastic connection is achieved.

The invention relates to a visual detection method for the assembling defects in a metal oxide arrester for electric power. In the visual detection method provided by the invention, a means that the electric measurement and the waveform observation are taken to be principal and the X-ray perspective radiation is taken to be auxiliary is adopted to realize the rapid diagnosis of the assembling defects in the metal oxide arrester for the electric power; the two ends of a discharge counter which is provided with an electric arrester are used for monitoring the voltage waveform through a common oscilloscope, and if the voltage waveform contains high-frequency and high-amplitude noise waves, the metallic suspended particle defect exists in the arrester; and by virtue of an X-ray perspective radiation means, the main point is that the visual expression of the structure feature in the arrester can be realized near the bottom of a single-section arrester, thereby directly determining that thedefect exists in the arrester. The visual detection method provided by the invention mainly integrates an electric detection means and an X-ray perspective radiation technique to realize the rapid positioning and determination of the assembling defects in the metal oxide arrester for the electric power, and has the obvious advantages of concise structure, high efficiency, defect shape visualization and the like.