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Time-Frequency Analysis

Spectrogram, cross-spectrogram, Fourier synchrosqueezing, time-frequency reassignment

Visualize and compare time-frequency content of nonstationary signals. Obtain sharp spectral estimates using reassignment or synchrosqueezing. Extract and track time-frequency ridges.

Functions

fsstFourier synchrosqueezed transform
ifsstInverse Fourier synchrosqueezed transform
pspectrumAnalyze signals in the frequency and time-frequency domains
spectrogramSpectrogram using short-time Fourier transform
tfridgeTime-frequency ridges
xspectrogramCross-spectrogram using short-time Fourier transforms

Apps

Signal AnalyzerVisualize and compare multiple signals and spectra

Topics

FFT-Based Time-Frequency Analysis

Display the spectrogram of a linear FM signal.

Practical Introduction to Time-Frequency Analysis

Perform and interpret basic time-frequency signal analysis of nonstationary signals.

Instantaneous Frequency of Complex Chirp

Compute the instantaneous frequency of a signal using the Fourier synchrosqueezed transform.

Detect Closely Spaced Sinusoids

Compute the instantaneous frequency of two sinusoids using the Fourier synchrosqueezed transform. Determine how separated the sinusoids must be for the transform to resolve them.

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