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Progettazione del filtro digitale

FIR, IIR, windowing, equiripple, minimi quadrati, Butterworth, Chebyshev, ellittico, pulse shaping

Progetta filtri digitali utilizzando come punto di partenza un insieme di specifiche (designfilt) o un algoritmo di progettazione (butter, fir1). Genera differenziatori FIR e filtri di Hilbert.

App

Filter Analyzer	View, analyze, and compare filters (Da R2024a)
Filter Designer	Design filters by choosing algorithm or specifying constraints

Attività di Live Editor

Filtro di progettazione

Design a digital filter in the Live Editor (Da R2021b)

Funzioni

espandi tutto

Filtri FIR

`cfirpm`	Complex and nonlinear-phase equiripple FIR filter design
`designfilt`	Design digital filter
`fir1`	Window-based FIR filter design
`fir2`	Frequency sampling-based FIR filter design
`fircls`	Constrained-least-squares FIR multiband filter design
`fircls1`	Constrained-least-squares linear-phase FIR lowpass and highpass filter design
`firls`	Least-squares linear-phase FIR filter design
`firpm`	Parks-McClellan optimal FIR filter design
`firpmord`	Parks-McClellan optimal FIR filter order estimation
`gaussdesign`	Gaussian FIR pulse-shaping filter design
`intfilt`	Interpolation FIR filter design
`kaiserord`	Kaiser window FIR filter design estimation parameters
`maxflat`	Generalized digital Butterworth filter design
`rcosdesign`	Raised cosine FIR pulse-shaping filter design
`sgolay`	Savitzky-Golay filter design

Filtri IIR

`butter`	Butterworth filter design
`buttord`	Butterworth filter order and cutoff frequency
`cheby1`	Chebyshev Type I filter design
`cheb1ord`	Chebyshev Type I filter order
`cheby2`	Chebyshev Type II filter design
`cheb2ord`	Chebyshev Type II filter order
`designfilt`	Design digital filter
`ellip`	Elliptic filter design
`ellipord`	Minimum order for elliptic filters
`yulewalk`	Recursive digital filter design

Utilità di filtro

`digitalFilter`	Digital filter
`double`	Cast coefficients of digital filter to double precision
`filt2block`	Generate Simulink filter block
`filterAnalyzer`	Analyze filters with Filter Analyzer app (Da R2024a)
`info`	Information about digital filter
`isdouble`	Determine if digital filter coefficients are double precision
`issingle`	Determine if digital filter coefficients are single precision
`polyscale`	Scale roots of polynomial
`polystab`	Stabilize polynomial
`scaleFilterSections`	Scale cascaded transfer functions with scale values (Da R2023b)
`setSampleRate`	Set sample rate of digital filter (Da R2026a)
`single`	Cast coefficients of digital filter to single precision

Risposte dei filtri

espandi tutto

Risposte FIR

Lowpass FIR	Design lowpass finite impulse response filter
Highpass FIR	Design highpass finite impulse response filter
Bandpass FIR	Design bandpass finite impulse response filter
Bandstop FIR	Design bandstop finite impulse response filter
Differentiator FIR	Design differentiator finite impulse response filter
Hilbert FIR	Design Hilbert finite impulse response filter
Arbitrary Response FIR	Design finite impulse response filter of arbitrary response

Risposte IIR

Lowpass IIR	Design lowpass infinite impulse response filter
Highpass IIR	Design highpass infinite impulse response filter
Bandpass IIR	Design bandpass infinite impulse response filter
Bandstop IIR	Design bandstop infinite impulse response filter

Argomenti

Use Filter Designer App

Import or create filters, design, inspect, and export filter designs.
- PASSAGGIO 1: Import or Create Filters
- PASSAGGIO 2: Design Filters
- PASSAGGIO 3: Quantize Filters
- PASSAGGIO 4: Manage and Analyze Filters
- PASSAGGIO 5: Export and Share Filters
IIR Filter Design
This example compares classical Butterworth, Chebyshev, and elliptic designs; and explores Bessel, Yule-Walker, and generalized Butterworth filters.
FIR Filter Design
This example shows how to use windowing, least squares, or the Parks-McClellan algorithm to design lowpass, highpass, multiband, or arbitrary-response filters, differentiators, or Hilbert transformers.
Filter Implementation
Filter signals using the filter function.
Anti-Causal, Zero-Phase Filter Implementation
Eliminate the phase distortion introduced by an IIR filter.
Compensate for the Delay Introduced by an FIR Filter
Use indexing to counteract the time shifts introduced by filtering.
Compensate for the Delay Introduced by an IIR Filter
Remove delays and distortion introduced by filtering, when it is critical to keep phase information intact.
Take Derivatives of a Signal
Use a differentiator filter to differentiate a signal without amplifying the noise.
Generate Guitar Chords Using the Karplus-Strong Algorithm
Generate realistic guitar chords using the Karplus-Strong algorithm and discrete-time filters.

Informazioni complementari

Progettazione del filtro in MATLAB

Esempi in primo piano

Practical Introduction to Digital Filter Design

Use the designfilt function to design FIR and IIR filters based on frequency response specifications.

Apri live script

Practical Introduction to Digital Filtering

Design, analyze, and apply digital filters to remove unwanted content from a signal without distorting the data.

Apri live script

Filter Design Gallery

Identify a filter response of interest, see how it is designed using the designfilt function, and use it in your own project.

Apri live script

Risorse didattiche

Elaborazione del segnale digitale: Segnali e progettazione di filtri

Apprendi i concetti alla base dei segnali analogici e digitali, dei filtri e della progettazione dei filtri, e applica quanto appreso per creare applicazione di filtraggio.