Contenuto principale

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Pre-elaborazione ed estrazione delle caratteristiche

Estrarre le caratteristiche del segnale nei domini del tempo, della frequenza e del tempo-frequenza

Estrai caratteristiche significative del segnale utilizzando funzioni da riga di comando o l'app Signal Feature Extractor da utilizzare nei modelli di Machine Learning.

App

EDF File AnalyzerView EDF or EDF+ files (Da R2021a)
Signal AnalyzerVisualize and compare multiple signals and spectra
Signal LabelerLabel signal attributes, regions, and points of interest
Signal Feature ExtractorExtract and analyze signal features (Da R2025a)

Funzioni

espandi tutto

detrendRemove polynomial trend
envelopeSignal envelope
lowpassLowpass-filter signals
smoothdataSmooth noisy data
cwtmag2sigSignal reconstruction from CWT magnitude (Da R2023b)
stftmag2sigSignal reconstruction from STFT magnitude
islocalmaxFind local maxima
findchangeptsFind abrupt changes in signal
findpeaksFind local maxima
refinepeaksRefine peak value and location estimates (Da R2024b)
zerocrossrateZero-crossing rate (Da R2021b)
audioDatastoreDatastore for collection of audio files
arrayDatastoreDatastore for in-memory data
imageDatastoreDatastore for image data
signalDatastoreDatastore for collection of signals
edfheaderCreate header structure for EDF or EDF+ file (Da R2021a)
edfinfoGet information about EDF/EDF+ file
edfreadRead data from EDF/EDF+ file
edfwriteCreate or modify EDF or EDF+ file (Da R2021a)
paddataPad data by adding elements (Da R2023b)
resizeResize data by adding or removing elements (Da R2023b)
trimdataTrim data by removing elements (Da R2023b)
meanMedia aritmetica o valore medio dell’array
rmsRoot mean square value
stdDeviazione standard
snrSignal-to-noise ratio
thdTotal harmonic distortion
sinadSignal to noise and distortion ratio
peak2rmsPeak-magnitude-to-RMS ratio
signalTimeFeatureExtractorStreamline signal time feature extraction (Da R2021a)
timeScalarFeatureOptionsStore information for converting time-domain feature vectors to scalar values (Da R2024b)
meanfreqMean frequency
medfreqMedian frequency
bandpowerBand power
obwOccupied bandwidth
powerbwPower bandwidth
pwelchWelch’s power spectral density estimate
signalFrequencyFeatureExtractorStreamline signal frequency feature extraction (Da R2021b)
frequencyScalarFeatureOptionsStore information for converting frequency-domain feature vectors to scalar values (Da R2024b)
stftShort-time Fourier transform
fsstFourier synchrosqueezed transform
emdEmpirical mode decomposition
vmdVariational mode decomposition
hhtHilbert-Huang transform
cwtContinuous 1-D wavelet transform
wsstWavelet synchrosqueezed transform
modwtMaximal overlap discrete wavelet transform
modwptMaximal overlap discrete wavelet packet transform
instbwEstimate instantaneous bandwidth (Da R2021a)
instfreqEstimate instantaneous frequency
spectralCrestSpectral crest for signals and spectrograms
spectralEntropySpectral entropy for signals and spectrograms
spectralFlatnessSpectral flatness for signals and spectrograms
spectralKurtosisSpectral kurtosis for signals and spectrograms
spectralSkewnessSpectral skewness for signals and spectrograms
tfridgeTime-frequency ridges
signalTimeFrequencyFeatureExtractorStreamline signal time-frequency feature extraction (Da R2024a)
timeFrequencyScalarFeatureOptionsStore information for converting time-frequency-domain feature vectors to scalar values (Da R2024a)
timeFrequencyScatteringJoint time-frequency scattering (Da R2024b)
waveletScatteringWavelet time scattering
wsstridgeTime-frequency ridges from wavelet synchrosqueezing
dlcwtDeep learning continuous wavelet transform (Da R2022b)
dlicwtDeep learning inverse continuous 1-D wavelet transform (Da R2024b)
dlmodwtDeep learning maximal overlap discrete wavelet transform and multiresolution analysis (Da R2022a)
dlstftDeep learning short-time Fourier transform (Da R2021a)
dlistftDeep learning inverse short-time Fourier transform (Da R2024a)
cwtLayerContinuous wavelet transform layer (Da R2022b)
icwtLayerInverse continuous wavelet transform layer (Da R2024b)
modwtLayerMaximal overlap discrete wavelet transform layer (Da R2022b)
stftLayerShort-time Fourier transform layer (Da R2021b)
istftLayerInverse short-time Fourier transform layer (Da R2024a)
framelblPartition label sequence into frames (Da R2024a)
framesigPartition signal into frames (Da R2024a)
scalarFeatureOptionsStore information for converting feature vectors to scalar values (Da R2024a)

Informazioni complementari

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