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Digital Filter Design

FIR, IIR, windowing, equiripple, least squares, Butterworth, Chebyshev, elliptic, pulse shaping

Design digital filters using as a starting point a set of specifications (designfilt) or a design algorithm (butter, fir1). Generate FIR differentiators and Hilbert filters.

Functions

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 filters
ellip Elliptic filter design
ellipord Minimum order for elliptic filters
polyscale Scale roots of polynomial
polystab Stabilize polynomial
yulewalk Recursive digital filter design
cfirpm Complex and nonlinear-phase equiripple FIR filter design
designfilt Design digital filters
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
digitalFilter Digital filter
double Cast coefficients of digital filter to double precision
dspfwiz Create Simulink filter block using Realize Model panel
filt2block Generate Simulink filter block
fvtool Open Filter Visualization Tool
info Information about digital filter
isdouble Determine if digital filter coefficients are double precision
issingle Determine if digital filter coefficients are single precision
single Cast coefficients of digital filter to single precision

Apps

Filter Designer Design filters starting with algorithm selection

Topics

IIR Filter Design

Compare classical Butterworth, Chebyshev, and elliptic designs. Explore Bessel, Yule-Walker, and generalized Butterworth filters.

FIR Filter Design

Use windowing, least squares, or the Parks-McClellan algorithm to design lowpass, highpass, multiband, or arbitrary-response filters, differentiators, or Hilbert transformers.

Filter Implementation and Analysis

Learn to 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.

Filter Builder Design Process

filterBuilder is a graphical interface that speeds up the filter design process.

Related Information

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