Main Content

Frequency-Response Models

Frequency-response models obtained using spectral analysis

A frequency-response model is the frequency response of a linear system evaluated over a range of frequency values. The model is represented by an idfrd model object that stores the frequency response, sample time, and input-output channel information.

Apps

System IdentificationIdentify models of dynamic systems from measured data

Live Editor Tasks

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

Functions

expand all

etfeEstimate empirical transfer functions and periodograms
spaEstimate frequency response with fixed frequency resolution using spectral analysis
spafdrEstimate frequency response and spectrum using spectral analysis with frequency-dependent resolution
idfrdFrequency response data or model
getpvecObtain model parameters and associated uncertainty data
setpvecModify values of model parameters
bodeBode frequency response of dynamic system
bodemag Magnitude-only Bode plot of frequency response
freqrespEvaluate system response over a grid of frequencies
chgFreqUnitChange frequency units of frequency-response data model

Topics