A Finite Time Mixed Acquisition Method of High and Low Frequency Signals Based on Multi-channel Analog-to-Digital Converter

Abstract

The invention discloses a hybrid collection method of finite times of high and low frequency signals based on a multichannel analog-to-digital converter. Rational configuration of channels is collected within the finite times to realize hybrid collection of waveforms of the high and low frequency signals. The method comprises the following steps: firstly dividing collected signals into low frequency signals or high frequency signals, and determining sampling frequency of the low frequency signals and the high frequency signals; then performing packet sampling on each signal according to the set sampling frequency and parameters according to the limitation of the maximum sampling rate of the analog-to-digital converter and the total number of sampling channels to obtain a set of sampling data points; finally, synthesizing signal waveforms by all data points in the set according to a set rule; and in the case of a fault, judging a sampling group of a fault signal according to mutation data point values, then the signal period data where the packet sampling is located do not participate in the superposition synthesis of previous and successive signal period data. The method disclosed by the invention has the advantages of simple hardware structure and high cost performance ratio.

Description

technical field [0001] The invention relates to a data collection method, in particular to a method for collecting high and low frequency signal waveforms based on a multi-channel analog-to-digital converter. Background technique [0002] In some occasions where multiple signals are collected, some low-frequency signals and high-frequency signals need to be collected at the same time. If the same frequency of the traditional single data acquisition card is used for acquisition, the contradiction between the acquisition frequency and the signal frequency cannot be matched. If the acquisition is performed according to the frequency required for high-frequency signal acquisition, the low-frequency signal part will collect too many data points in a single cycle, wasting more resources, and the cost performance is low; The single-period acquisition data points of the signal part do not meet the acquisition requirements. [0003] The Chinese patent with the publication number 20...

AI Technical Summary

Problems solved by technology

The existing technology can be applied to the mixed acquisition of high and low frequency signal waveforms, but the acquisition requirements of high frequency signals are achieved by using software interpolation to increase the frequency, not the actual sampling data, and the soft simulation interpolation results are not as accurate as the actual sampling data.

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