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design.

Chebyshev type II analog lowpass filter prototype.

cheb2ap

Design a window-based finite impulse response filter.

Elliptic analog lowpass filter prototype.

fir1

ellipap

Quick Reference

Design a frequency sampling-based finite impulse

fir2

Author: Jialong He

response filter.

Analog Filter Design

Constrained least square FIR filter design for

fircls

multiband filters.

Bessel analog filter design.

besself

Signal Processing Toolbox

Constrained least square filter design for lowpass and

fircls1

Butterworth analog and digital filter design.

butter

highpass linear phase FIR filters.

Filter Analysis

Chebyshev type I filter design (passband ripple).

cheby1

Least square linear-phase FIR filter design.

firls

Absolute value (magnitude).

Chebyshev type II filter design (stopband ripple).

abs

cheby2

Raised cosine FIR filter design.

firrcos

Elliptic (Cauer) filter design.

Phase angle.

ellip

angle

Interpolation FIR filter design.

intfilt

Frequency response of analog filters.

freqs

Estimate parameters for an FIR filter design with

kaiserord

Frequency spacing for frequency response.

Kaiser window.

freqspace

Analog Filter Transformation

Compute the frequency response of digital filters.

Compute the Parks-McClellan optimal FIR filter

freqz

remez

design.

Transform lowpass analog filters to bandpass.

lp2bp

Plot frequency response data.

freqzplot

Parks-McClellan optimal FIR filter order estimation.

Transform lowpass analog filters to bandstop.

remezord

lp2bs

grpdelay

Compute the average filter delay (group delay).

Savitzky-Golay filter design.

Transform lowpass analog filters to highpass.

sgolay

lp2hp

Compute the impulse response of digital filters.

impz

Change the cut -off frequency for a lowpass analog

lp2lp

Unwrap phase angles.

unwrap

filter.

Zero-pole plot.

zplane

IIR Digital Filter Design--Classical and Direct

butter

Butterworth analog and digital filter design.

Filter Discretization

Chebyshev type I filter design (passband ripple).

cheby1

Filter Implementation

Bilinear transformation method for analog-to-digital

bilinear

Chebyshev type II filter design (stopband ripple).

cheby2

Convolution and polynomial multiplication.

filter conversion.

conv

Elliptic (Cauer) filter design.

ellip

Two-dimensional convolution.

Impulse invariance method for analog-to-digital filter

conv2

impinvar

Generalized digital Butterworth filter design.

conversion.

maxflat

Deconvolution and polynomial division.

deconv

Prony's method for time-domain IIR filter design.

prony

FFT -based FIR filtering using the overlap-add

fftfilt

Compute a linear model using Steiglitz-McBride

method.

stmcb

Linear System Transformations

iteration.

filter

Filter data with a recursive (IIR) or nonrecursive

Recursive digital filter design.

(FIR) filter.

yulewalk

Convert lattice filter parameters to transfer function

latc2tf

form.

filter2

Two-dimensional digital filtering.

Stabilize a polynomial.

polystab

Zero-phase digital filtering.

filtfilt

IIR Filter Order Estimation

Scale the roots of a polynomial.

polyscale

Find initial conditions for a transposed direct form II

filtic

filter implementation.

buttord

Calculate the order and cutoff frequency for a

z-transform partial-fraction expansion.

residuez

Butterworth filter.

Lattice and lattice-ladder filter implementation.

Convert digital filter second-order section parameters

latcfilt

sos2ss

Calculate the order for a Chebyshev type I filter.

to state-space form.

cheb1ord

One-dimensional median filtering.

medfilt1

Calculate the order for a Chebyshev type II filter.

Convert digital filter second-order section data to

cheb2ord

sos2tf

Savitzky-Golay filtering.

sgolayfilt

transfer function form.

Calculate the minimum order for elliptic filters.

ellipord

Second-order (biquadratic) IIR digital filtering.

sosfil t

sos2zp

Convert digital filter second-order sections

Upsample, apply an FIR filter, and downsample.

parameters to zero-pole-gain form.

upfirdn

Convert digital filter state-space parameters to

Analog Lowpass Filter Prototypes

ss2sos

second-order sections form.

Bessel analog lowpass filter prototype.

besselap

FIR Digital Filter Design

Convert state-space filter parameters to transfer

ss2tf

Butterworth analog lowpass filter prototype.

function form.

buttap

convmtx

Convolution matrix.

Chebyshev type I analog lowpass filter prototype.

cheb1ap

Convert state-space filter parameters to zero-pole-

ss2zp

Complex and nonlinear-phase equiripple FIR filter

cremez

gain form.

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