Frequency-Response Models

Frequency-response models obtained using spectral analysis

Apps

Identify models of dynamic systems from measured data

Estimate spectral model using time-domain data in the Live Editor (Since R2021b)

`etfe`	Estimate empirical transfer functions and periodograms
`spa`	Estimate frequency response with fixed frequency resolution using spectral analysis
`spafdr`	Estimate frequency response and spectrum using spectral analysis with frequency-dependent resolution
`idfrd`	Frequency response data or model

`getpvec`	Obtain model parameters and associated uncertainty data
`setpvec`	Modify values of model parameters
`bode`	Bode plot of frequency response, or magnitude and phase data
`bodemag`	Magnitude-only Bode plot of frequency response
`freqresp`	Evaluate system response over a grid of frequencies
`chgFreqUnit`	Change frequency units of frequency-response data model

Estimate Frequency-Response Models in the App
You must have already imported your data into the app and performed any necessary preprocessing operations.
Estimate Frequency-Response Models at the Command Line
Estimate frequency-response models using etfe, spa, and spafdr commands.

What is a Frequency-Response Model?
A frequency-response model is the frequency response of a linear system evaluated over a range of frequency values.
Data Supported by Frequency-Response Models
Characteristics of data supported for estimation of spectral analysis models.
Selecting the Method for Computing Spectral Models
How to select the method for computing spectral models during estimation in the app and at the command line.
Controlling Frequency Resolution of Spectral Models
Controlling frequency resolution of spectral models during estimation in the app and at the command line.
Spectrum Normalization
The spectrum of a signal is the square of the Fourier transform of the signal.