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描述性统计量

峰值、RMS 水平、峰间振幅、波峰因子、动态时间规整、CUSUM 控制图、编辑距离

使用 findpeaks 定位信号的局部最大值,并按高度、宽度或相对高差对峰值进行排序。使用 peak2rms 函数确定信号的波峰因子,并计算常见的描述性统计量,如最大值、最小值、标准差和 RMS 水平。在更大的数据集中搜索感兴趣的信号,并按时间对齐信号。定位信号突然变化或漂移出目标范围的点。对信号添加标签以用于分析或机器和深度学习应用。

App

信号分析器可视化和比较多个信号和频谱
信号标注器Label signal attributes, regions, and points of interest, and extract features (自 R2019a 起)

函数

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cummax累积最大值
cummin累积最小值
envelope信号包络
max数组的最大元素
mean数组的均值
meanfreqMean frequency
medfreqMedian frequency
median数组的中位数值
min数组的最小元素
movmad移动中位数绝对偏差
movmedian移动中位数
peak2peakMaximum-to-minimum difference
peak2rmsPeak-magnitude-to-RMS ratio
rssqRoot-sum-of-squares level
seqperiodCompute period of sequence
std标准差
var方差
alignsignalsAlign two signals by delaying earliest signal (自 R2019a 起)
cusumDetect small changes in mean using cumulative sum
dtwDistance between signals using dynamic time warping
edrEdit distance on real signals
findchangeptsFind abrupt changes in signal
finddelayEstimate delay(s) between signals
findpeaks查找局部最大值
findsignalFind signal location using similarity search
signalFrequencyFeatureExtractorStreamline signal frequency feature extraction (自 R2021b 起)
signalTimeFeatureExtractorStreamline signal time feature extraction (自 R2021a 起)
zerocrossrateZero-crossing rate (自 R2021b 起)
labeledSignalSetCreate labeled signal set
signalLabelDefinitionCreate signal label definition
countlabelsCount number of unique labels (自 R2021a 起)
filenames2labelsGet list of labels from filenames (自 R2022b 起)
folders2labelsGet list of labels from folder names (自 R2021a 起)
splitlabelsFind indices to split labels according to specified proportions (自 R2021a 起)
signalMaskModify and convert signal masks and extract signal regions of interest (自 R2020b 起)
binmask2sigroiConvert binary mask to matrix of ROI limits (自 R2020b 起)
extendsigroiExtend signal regions of interest to left and right (自 R2020b 起)
extractsigroiExtract signal regions of interest (自 R2020b 起)
mergesigroiMerge signal regions of interest (自 R2020b 起)
removesigroiRemove signal regions of interest (自 R2020b 起)
shortensigroiShorten signal regions of interest from left and right (自 R2020b 起)
sigroi2binmaskConvert matrix of ROI limits to binary mask (自 R2020b 起)
sigrangebinmaskLabel signal samples with values within a specified range (自 R2023a 起)

主题