Signal Processing Toolbox

Function Reference

Functions - By Category

This section contains brief descriptions of all functions in the toolbox arranged by category. For a list of all functions in alphabetical order, see Functions -- Alphabetical List

The Signal Processing Toolbox contains the following categories of functions.

Filter Analysis

Filter Implementation

FIR Digital Filter Design

IIR Digital Filter Design

IIR FIlter Order Estimation

Analog Lowpass Filter Prototypes

Analog Filter Design

Analog Filter Transformation

Filter Discretization

Linear System Transformations

Windows

Transforms

Cepstral Analysis

Statistical Signal Processing and Spectral Analysis

Parametric Modeling

Linear Prediction

Multirate Signal Processing

Waveform Generation

Specialized Operations

Graphical User Interfaces

Filter Analysis

abs
Absolute value (magnitude). (This is a MATLAB function.)

angle
Phase angle. (This is a MATLAB function.)

freqs
Frequency response of analog filters.

freqspace
Frequency spacing for frequency response. (This is a MATLAB function.)

freqz
Compute the frequency response of digital filters.

fvtool
Open the Filter Visualization Tool.

grpdelay
Compute the average filter delay (group delay).

impz
Compute the impulse response of digital filters.

phasedelay
Compute the phase delay response of digital filters.

phasez
Compute the phase response of digital filters.

stepz
Compute the step response of digital filters.

unwrap
Unwrap phase angles. (This is a MATLAB function.)

zerophase
Compute the zero-phase reponse of digital filters.

zplane
Zero-pole plot.

Filter Implementation

conv
Convolution and polynomial multiplication. (This is a MATLAB function.)

conv2
Two-dimensional convolution. (This is a MATLAB function.)

deconv
Deconvolution and polynomial division. (This is a MATLAB function.)

fftfilt
FFT-based FIR filtering using the overlap-add method.

filter
Filter data with a recursive (IIR) or nonrecursive (FIR) filter. (This is a MATLAB function.)

filter2
Two-dimensional digital filtering. (This is a MATLAB function.)

filtfilt
Zero-phase digital filtering.

filtic
Find initial conditions for a transposed direct form II filter implementation.

latcfilt
Lattice and lattice-ladder filter implementation.

medfilt1
One-dimensional median filtering.

sgolayfilt
Savitzky-Golay filtering.

sosfilt
Second-order (biquadratic) IIR digital filtering.

upfirdn
Upsample, apply an FIR filter, and downsample.

FIR Digital Filter Design

convmtx
Convolution matrix.

cremez
Complex and nonlinear-phase equiripple FIR filter design.

dfilt
Create filter using object-oriented syntax.

fir1
Design a window-based finite impulse response filter.

fir2
Design a frequency sampling-based finite impulse response filter.

fircls
Constrained least square FIR filter design for multiband filters.

fircls1
Constrained least square filter design for lowpass and highpass linear phase FIR filters.

firgauss
Gaussian FIR filter design.

firls
Least square linear-phase FIR filter design.

firrcos
Raised cosine FIR filter design.

intfilt
Interpolation FIR filter design.

kaiserord
Estimate parameters for an FIR filter design with Kaiser window.

remez
Compute the Parks-McClellan optimal FIR filter design.

remezord
Parks-McClellan optimal FIR filter order estimation.

sgolay
Savitzky-Golay filter design.

IIR Digital Filter Design

butter
Butterworth analog and digital filter design.

cheby1
Chebyshev Type I filter design (passband ripple).

cheby2
Chebyshev Type II filter design (stopband ripple).

dfilt
Create filter using object-oriented syntax.

ellip
Elliptic (Cauer) filter design.

maxflat
Generalized digital Butterworth filter design.

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

stmcb
Compute a linear model using Steiglitz-McBride iteration.

yulewalk
Recursive digital filter design.

IIR FIlter Order Estimation

buttord
Calculate the order and cutoff frequency for a Butterworth filter.

cheb1ord
Calculate the order for a Chebyshev Type I filter.

cheb2ord
Calculate the order for a Chebyshev Type II filter.

ellipord
Calculate the minimum order for elliptic filters.

Analog Lowpass Filter Prototypes

besselap
Bessel analog lowpass filter prototype.

buttap
Butterworth analog lowpass filter prototype.

cheb1ap
Chebyshev Type I analog lowpass filter prototype.

cheb2ap
Chebyshev Type II analog lowpass filter prototype.

ellipap
Elliptic analog lowpass filter prototype.

top of page

Analog Filter Design

besself
Bessel analog filter design.

butter
Butterworth analog and digital filter design.

cheby1
Chebyshev Type I filter design (passband ripple).

cheby2
Chebyshev Type II filter design (stopband ripple).

ellip
Elliptic (Cauer) filter design.

Analog Filter Transformation

lp2bp
Transform lowpass analog filters to bandpass.

lp2bs
Transform lowpass analog filters to bandstop.

lp2hp
Transform lowpass analog filters to highpass.

lp2lp
Change the cut-off frequency for a lowpass analog filter.

Filter Discretization

bilinear
Bilinear transformation method for analog-to-digital filter conversion.

impinvar
Impulse invariance method for analog-to-digital filter conversion.

Linear System Transformations

latc2tf
Convert lattice filter parameters to transfer function form.

polystab
Stabilize a polynomial.

polyscale
Scale the roots of a polynomial.

residuez
z-transform partial-fraction expansion.

sos2ss
Convert digital filter second-order section parameters to state-space form.

sos2tf
Convert digital filter second-order section data to transfer function form.

sos2zp
Convert digital filter second-order sections parameters to zero-pole-gain form.

ss2sos
Convert digital filter state-space parameters to second-order sections form.

ss2tf
Convert state-space filter parameters to transfer function form.

ss2zp
Convert state-space filter parameters to zero-pole-gain form.

tf2latc
Convert transfer function filter parameters to lattice filter form.

tf2sos
Convert digital filter transfer function data to second-order sections form.

tf2ss
Convert transfer function filter parameters to state-space form.

tf2zp
Convert continuous-time transfer function filter parameters to zero-pole-gain form

tf2zpk
Convert discrete-time transfer function filter parameters to zero-pole-gain form

zp2sos
Convert digital filter zero-pole-gain parameters to second-order sections form.

zp2ss
Convert zero-pole-gain filter parameters to state-space form.

zp2tf
Convert zero-pole-gain filter parameters to transfer function form.

Windows

barthannwin
Compute a modified Bartlett-Hann window.

bartlett
Compute a Bartlett window.

blackman
Compute a Blackman window.

blackmanharris
Compute a minimum 4-term Blackman-Harris window.

bohmanwin
Compute a Bohman window.

chebwin
Compute a Chebyshev window.

flattopwin
Compute a flat top window.

gausswin
Compute a Gaussian window.

hamming
Compute a Hamming window.

hann
Compute the Hann (Hanning) window.

kaiser
Compute a Kaiser window.

nuttallwin
Compute a Nuttall-defined minimum 4-term Blackman-Harris window.

parzenwin
Compute a Parzen (de la Valle-Poisson) window.

rectwin
Compute a rectangular window.

sigwin
Create window using object-oriented syntax.

triang
Compute a triangular window.

tukeywin
Compute a Tukey (tapered cosine) window.

window
Window function gateway.

Transforms

bitrevorder
Permute input into bit-reversed order.

czt
Chirp z-transform.

dct
Discrete cosine transform (DCT).

dftmtx
Discrete Fourier transform matrix.

fft
Compute the one-dimensional fast Fourier transform. (This is a MATLAB function.)

fft2
Compute the two-dimensional fast Fourier transform. (This is a MATLAB function.)

fftshift
Rearrange the outputs of the FFT functions. (This is a MATLAB function.)

goertzel
Compute the discrete Fourier transform using the second order Goertzel algorithm.

hilbert
Compute the discrete-time analytic signal using the Hilbert transform.

idct
Inverse discrete cosine transform.

ifft
One-dimensional inverse fast Fourier transform. (This is a MATLAB function.)

ifft2
Two-dimensional inverse fast Fourier transform. (This is a MATLAB function.)

Cepstral Analysis

cceps
Complex cepstral analysis.

icceps
Inverse complex cepstrum.

rceps
Real cepstrum and minimum phase reconstruction.

Statistical Signal Processing and Spectral Analysis

cohere
Estimate magnitude squared coherence function between two signals.

corrcoef
Compute the correlation coefficient matrix. (This is a MATLAB function.)

corrmtx
Compute a data matrix for autocorrelation matrix estimation.

cov
Compute the covariance matrix. (This is a MATLAB function.)

csd
Estimate the cross spectral density (CSD) of two signals.

pburg
Estimate the power spectral density using the Burg method.

pcov
Estimate the power spectral density using the covariance method.

peig
Estimate the pseudospectrum using the eigenvector method.

periodogram
Estimate the power spectral density (PSD) of a signal using a periodogram.

pmcov
Estimate the power spectral density using the modified covariance method.

pmtm
Estimate the power spectral density using the multitaper method (MTM).

pmusic
Estimate the power spectral density using MUSIC algorithm.

psdplot
Plot power spectral density (PSD) data.

pwelch
Estimate the power spectral density (PSD) of a signal using Welch's method.

pyulear
Estimate the power spectral density using the Yule-Walker AR method.

rooteig
Estimate frequency and power content using the eigenvector method.

rootmusic
Estimate frequency and power content using the root MUSIC algorithm.

tfe
Estimate the transfer function from input and output.

xcorr
Estimate the cross-correlation function.

xcorr2
Estimate the two-dimensional cross-correlation.

xcov
Estimate the cross-covariance function (equal to mean-removed cross-correlation).

Parametric Modeling

arburg
Compute an estimate of AR model parameters using the Burg method.

arcov
Compute an estimate of AR model parameters using the covariance method.

armcov
Compute an estimate of AR model parameters using the modified covariance method.

aryule
Compute an estimate of AR model parameters using the Yule-Walker method.

ident
See the System Identification Toolbox documentation.

invfreqs
Identify continuous-time filter parameters from frequency response data.

invfreqz
Identify discrete-time filter parameters from frequency response data.

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

stmcb
Compute a linear model using Steiglitz-McBride iteration.

Linear Prediction

ac2poly
Convert an autocorrelation sequence to prediction polynomial.

ac2rc
Convert an autocorrelation sequence to reflection coefficients.

is2rc
Convert inverse sine parameters to reflection coefficients.

lar2rc
Convert log area ratio parameters to reflection coefficients.

levinson
Compute the Levinson-Durbin recursion.

lpc
Compute linear prediction filter coefficients.

lsf2poly
Convert line spectral frequencies to a prediction filter coefficients.

poly2ac
Convert a prediction filter polynomial to an autocorrelation sequence.

poly2lsf
Convert prediction filter coefficients to line spectral frequencies.

poly2rc
Convert a prediction filter polynomial to reflection coefficients.

rc2ac
Convert reflection coefficients to an autocorrelation sequence.

rc2is
Convert reflection coefficients to inverse sine parameters.

rc2lar
Convert reflection coefficients to log area ratio parameters.

rc2poly
Convert reflection coefficients to a prediction filter polynomial.

rlevinson
Compute the reverse Levinson-Durbin recursion.

schurrc
Compute reflection coefficients from an autocorrelation sequence.

Multirate Signal Processing

decimate
Decrease the sampling rate for a sequence (decimation).

downsample
Reduce the sampling rate by an integer factor.

interp
Increase sampling rate by an integer factor (interpolation).

interp1
One-dimensional data interpolation (table lookup).

resample
Change sampling rate by any rational factor.

spline
Cubic spline interpolation.

upfirdn
Upsample, apply an FIR filter, and downsample.

upsample
Increase the sampling rate by an integer factor

Waveform Generation

chirp
Generate a swept-frequency cosine.

diric
Compute the Dirichlet or periodic sinc function.

gauspuls
Generate a Gaussian-modulated sinusoidal pulse.

gmonopuls
Generate a Gaussian monopulse.

pulstran
Generate a pulse train.

rectpuls
Generate a sampled aperiodic rectangle.

sawtooth
Generate a sawtooth or triangle wave.

sinc
Sinc function.

square
Generate a square wave.

tripuls
Generate a sampled aperiodic triangle.

vco
Voltage controlled oscillator.

Specialized Operations

buffer
Buffer a signal vector into a matrix of data frames.

cell2sos
Convert a cell array for second-order sections to a second-order section matrix.

cplxpair
Group complex numbers into complex conjugate pairs. (This is a MATLAB function.)

demod
Demodulation for communications simulation.

dpss
Discrete prolate spheroidal sequences (Slepian sequences).

dpssclear
Remove discrete prolate spheroidal sequences from database.

dpssdir
Discrete prolate spheroidal sequences database directory.

dpssload
Load discrete prolate spheroidal sequences from database.

dpsssave
Save discrete prolate spheroidal sequences in database.

eqtflength
Make the lengths of a transfer function's numerator and denominator equal.

modulate
Modulation for communications simulation.

seqperiod
Compute the period of a sequence.

sos2cell
Convert a second-order section matrix to cell arrays.

specgram
Time-dependent frequency analysis (spectrogram).

stem
Plot discrete sequence data.

strips
Strip plot.

udecode
Decode 2ⁿ-level quantized integer inputs to floating-point outputs.

uencode
Quantize and encode floating-point inputs to integer outputs.

Graphical User Interfaces

fdatool
Open the Filter Design and Analysis Tool.

fvtool
Open the Filter Visualization Tool.

sptool
Interactive digital signal processing tool (SPTool).

wintool
Open the Window Design and Analysis Tool.

wvtool
Open the Window Visualization Tool.

Making Signal Measurements: Using Markers Functions -- Alphabetical List

`abs`	Absolute value (magnitude). (This is a MATLAB function.)
`angle`	Phase angle. (This is a MATLAB function.)
`freqs`	Frequency response of analog filters.
`freqspace`	Frequency spacing for frequency response. (This is a MATLAB function.)
`freqz`	Compute the frequency response of digital filters.
`fvtool`	Open the Filter Visualization Tool.
`grpdelay`	Compute the average filter delay (group delay).
`impz`	Compute the impulse response of digital filters.
`phasedelay`	Compute the phase delay response of digital filters.
`phasez`	Compute the phase response of digital filters.
`stepz`	Compute the step response of digital filters.
`unwrap`	Unwrap phase angles. (This is a MATLAB function.)
`zerophase`	Compute the zero-phase reponse of digital filters.
`zplane`	Zero-pole plot.

`conv`	Convolution and polynomial multiplication. (This is a MATLAB function.)
`conv2`	Two-dimensional convolution. (This is a MATLAB function.)
`deconv`	Deconvolution and polynomial division. (This is a MATLAB function.)
`fftfilt`	FFT-based FIR filtering using the overlap-add method.
`filter`	Filter data with a recursive (IIR) or nonrecursive (FIR) filter. (This is a MATLAB function.)
`filter2`	Two-dimensional digital filtering. (This is a MATLAB function.)
`filtfilt`	Zero-phase digital filtering.
`filtic`	Find initial conditions for a transposed direct form II filter implementation.
`latcfilt`	Lattice and lattice-ladder filter implementation.
`medfilt1`	One-dimensional median filtering.
`sgolayfilt`	Savitzky-Golay filtering.
`sosfilt`	Second-order (biquadratic) IIR digital filtering.
`upfirdn`	Upsample, apply an FIR filter, and downsample.

`convmtx`	Convolution matrix.
`cremez`	Complex and nonlinear-phase equiripple FIR filter design.
`dfilt`	Create filter using object-oriented syntax.
`fir1`	Design a window-based finite impulse response filter.
`fir2`	Design a frequency sampling-based finite impulse response filter.
`fircls`	Constrained least square FIR filter design for multiband filters.
`fircls1`	Constrained least square filter design for lowpass and highpass linear phase FIR filters.
`firgauss`	Gaussian FIR filter design.
`firls`	Least square linear-phase FIR filter design.
`firrcos`	Raised cosine FIR filter design.
`intfilt`	Interpolation FIR filter design.
`kaiserord`	Estimate parameters for an FIR filter design with Kaiser window.
`remez`	Compute the Parks-McClellan optimal FIR filter design.
`remezord`	Parks-McClellan optimal FIR filter order estimation.
`sgolay`	Savitzky-Golay filter design.

`butter`	Butterworth analog and digital filter design.
`cheby1`	Chebyshev Type I filter design (passband ripple).
`cheby2`	Chebyshev Type II filter design (stopband ripple).
`dfilt`	Create filter using object-oriented syntax.
`ellip`	Elliptic (Cauer) filter design.
`maxflat`	Generalized digital Butterworth filter design.
`prony`	Prony's method for time-domain IIR filter design.
`stmcb`	Compute a linear model using Steiglitz-McBride iteration.
`yulewalk`	Recursive digital filter design.

`buttord`	Calculate the order and cutoff frequency for a Butterworth filter.
`cheb1ord`	Calculate the order for a Chebyshev Type I filter.
`cheb2ord`	Calculate the order for a Chebyshev Type II filter.
`ellipord`	Calculate the minimum order for elliptic filters.

`besselap`	Bessel analog lowpass filter prototype.
`buttap`	Butterworth analog lowpass filter prototype.
`cheb1ap`	Chebyshev Type I analog lowpass filter prototype.
`cheb2ap`	Chebyshev Type II analog lowpass filter prototype.
`ellipap`	Elliptic analog lowpass filter prototype.

`besself`	Bessel analog filter design.
`butter`	Butterworth analog and digital filter design.
`cheby1`	Chebyshev Type I filter design (passband ripple).
`cheby2`	Chebyshev Type II filter design (stopband ripple).
`ellip`	Elliptic (Cauer) filter design.

`lp2bp`	Transform lowpass analog filters to bandpass.
`lp2bs`	Transform lowpass analog filters to bandstop.
`lp2hp`	Transform lowpass analog filters to highpass.
`lp2lp`	Change the cut-off frequency for a lowpass analog filter.

`bilinear`	Bilinear transformation method for analog-to-digital filter conversion.
`impinvar`	Impulse invariance method for analog-to-digital filter conversion.

`latc2tf`	Convert lattice filter parameters to transfer function form.
`polystab`	Stabilize a polynomial.
`polyscale`	Scale the roots of a polynomial.
`residuez`	z-transform partial-fraction expansion.
`sos2ss`	Convert digital filter second-order section parameters to state-space form.
`sos2tf`	Convert digital filter second-order section data to transfer function form.
`sos2zp`	Convert digital filter second-order sections parameters to zero-pole-gain form.
`ss2sos`	Convert digital filter state-space parameters to second-order sections form.
`ss2tf`	Convert state-space filter parameters to transfer function form.
`ss2zp`	Convert state-space filter parameters to zero-pole-gain form.
`tf2latc`	Convert transfer function filter parameters to lattice filter form.
`tf2sos`	Convert digital filter transfer function data to second-order sections form.
`tf2ss`	Convert transfer function filter parameters to state-space form.
`tf2zp`	Convert continuous-time transfer function filter parameters to zero-pole-gain form
`tf2zpk`	Convert discrete-time transfer function filter parameters to zero-pole-gain form
`zp2sos`	Convert digital filter zero-pole-gain parameters to second-order sections form.
`zp2ss`	Convert zero-pole-gain filter parameters to state-space form.
`zp2tf`	Convert zero-pole-gain filter parameters to transfer function form.

`barthannwin`	Compute a modified Bartlett-Hann window.
`bartlett`	Compute a Bartlett window.
`blackman`	Compute a Blackman window.
`blackmanharris`	Compute a minimum 4-term Blackman-Harris window.
`bohmanwin`	Compute a Bohman window.
`chebwin`	Compute a Chebyshev window.
`flattopwin`	Compute a flat top window.
`gausswin`	Compute a Gaussian window.
`hamming`	Compute a Hamming window.
`hann`	Compute the Hann (Hanning) window.
`kaiser`	Compute a Kaiser window.
`nuttallwin`	Compute a Nuttall-defined minimum 4-term Blackman-Harris window.
`parzenwin`	Compute a Parzen (de la Valle-Poisson) window.
`rectwin`	Compute a rectangular window.
`sigwin`	Create window using object-oriented syntax.
`triang`	Compute a triangular window.
`tukeywin`	Compute a Tukey (tapered cosine) window.
`window`	Window function gateway.

`bitrevorder`	Permute input into bit-reversed order.
`czt`	Chirp z-transform.
`dct`	Discrete cosine transform (DCT).
`dftmtx`	Discrete Fourier transform matrix.
`fft`	Compute the one-dimensional fast Fourier transform. (This is a MATLAB function.)
`fft2`	Compute the two-dimensional fast Fourier transform. (This is a MATLAB function.)
`fftshift`	Rearrange the outputs of the FFT functions. (This is a MATLAB function.)
`goertzel`	Compute the discrete Fourier transform using the second order Goertzel algorithm.
`hilbert`	Compute the discrete-time analytic signal using the Hilbert transform.
`idct`	Inverse discrete cosine transform.
`ifft`	One-dimensional inverse fast Fourier transform. (This is a MATLAB function.)
`ifft2`	Two-dimensional inverse fast Fourier transform. (This is a MATLAB function.)

`cceps`	Complex cepstral analysis.
`icceps`	Inverse complex cepstrum.
`rceps`	Real cepstrum and minimum phase reconstruction.

`cohere`	Estimate magnitude squared coherence function between two signals.
`corrcoef`	Compute the correlation coefficient matrix. (This is a MATLAB function.)
`corrmtx`	Compute a data matrix for autocorrelation matrix estimation.
`cov`	Compute the covariance matrix. (This is a MATLAB function.)
`csd`	Estimate the cross spectral density (CSD) of two signals.
`pburg`	Estimate the power spectral density using the Burg method.
`pcov`	Estimate the power spectral density using the covariance method.
`peig`	Estimate the pseudospectrum using the eigenvector method.
`periodogram`	Estimate the power spectral density (PSD) of a signal using a periodogram.
`pmcov`	Estimate the power spectral density using the modified covariance method.
`pmtm`	Estimate the power spectral density using the multitaper method (MTM).
`pmusic`	Estimate the power spectral density using MUSIC algorithm.
`psdplot`	Plot power spectral density (PSD) data.
`pwelch`	Estimate the power spectral density (PSD) of a signal using Welch's method.
`pyulear`	Estimate the power spectral density using the Yule-Walker AR method.
`rooteig`	Estimate frequency and power content using the eigenvector method.
`rootmusic`	Estimate frequency and power content using the root MUSIC algorithm.
`tfe`	Estimate the transfer function from input and output.
`xcorr`	Estimate the cross-correlation function.
`xcorr2`	Estimate the two-dimensional cross-correlation.
`xcov`	Estimate the cross-covariance function (equal to mean-removed cross-correlation).

`arburg`	Compute an estimate of AR model parameters using the Burg method.
`arcov`	Compute an estimate of AR model parameters using the covariance method.
`armcov`	Compute an estimate of AR model parameters using the modified covariance method.
`aryule`	Compute an estimate of AR model parameters using the Yule-Walker method.
`ident`	See the System Identification Toolbox documentation.
`invfreqs`	Identify continuous-time filter parameters from frequency response data.
`invfreqz`	Identify discrete-time filter parameters from frequency response data.
`prony`	Prony's method for time domain IIR filter design.
`stmcb`	Compute a linear model using Steiglitz-McBride iteration.

`ac2poly`	Convert an autocorrelation sequence to prediction polynomial.
`ac2rc`	Convert an autocorrelation sequence to reflection coefficients.
`is2rc`	Convert inverse sine parameters to reflection coefficients.
`lar2rc`	Convert log area ratio parameters to reflection coefficients.
`levinson`	Compute the Levinson-Durbin recursion.
`lpc`	Compute linear prediction filter coefficients.
`lsf2poly`	Convert line spectral frequencies to a prediction filter coefficients.
`poly2ac`	Convert a prediction filter polynomial to an autocorrelation sequence.
`poly2lsf`	Convert prediction filter coefficients to line spectral frequencies.
`poly2rc`	Convert a prediction filter polynomial to reflection coefficients.
`rc2ac`	Convert reflection coefficients to an autocorrelation sequence.
`rc2is`	Convert reflection coefficients to inverse sine parameters.
`rc2lar`	Convert reflection coefficients to log area ratio parameters.
`rc2poly`	Convert reflection coefficients to a prediction filter polynomial.
`rlevinson`	Compute the reverse Levinson-Durbin recursion.
`schurrc`	Compute reflection coefficients from an autocorrelation sequence.

`decimate`	Decrease the sampling rate for a sequence (decimation).
`downsample`	Reduce the sampling rate by an integer factor.
`interp`	Increase sampling rate by an integer factor (interpolation).
`interp1`	One-dimensional data interpolation (table lookup).
`resample`	Change sampling rate by any rational factor.
`spline`	Cubic spline interpolation.
`upfirdn`	Upsample, apply an FIR filter, and downsample.
`upsample`	Increase the sampling rate by an integer factor

`chirp`	Generate a swept-frequency cosine.
`diric`	Compute the Dirichlet or periodic sinc function.
`gauspuls`	Generate a Gaussian-modulated sinusoidal pulse.
`gmonopuls`	Generate a Gaussian monopulse.
`pulstran`	Generate a pulse train.
`rectpuls`	Generate a sampled aperiodic rectangle.
`sawtooth`	Generate a sawtooth or triangle wave.
`sinc`	Sinc function.
`square`	Generate a square wave.
`tripuls`	Generate a sampled aperiodic triangle.
`vco`	Voltage controlled oscillator.

`buffer`	Buffer a signal vector into a matrix of data frames.
`cell2sos`	Convert a cell array for second-order sections to a second-order section matrix.
`cplxpair`	Group complex numbers into complex conjugate pairs. (This is a MATLAB function.)
`demod`	Demodulation for communications simulation.
`dpss`	Discrete prolate spheroidal sequences (Slepian sequences).
`dpssclear`	Remove discrete prolate spheroidal sequences from database.
`dpssdir`	Discrete prolate spheroidal sequences database directory.
`dpssload`	Load discrete prolate spheroidal sequences from database.
`dpsssave`	Save discrete prolate spheroidal sequences in database.
`eqtflength`	Make the lengths of a transfer function's numerator and denominator equal.
`modulate`	Modulation for communications simulation.
`seqperiod`	Compute the period of a sequence.
`sos2cell`	Convert a second-order section matrix to cell arrays.
`specgram`	Time-dependent frequency analysis (spectrogram).
`stem`	Plot discrete sequence data.
`strips`	Strip plot.
`udecode`	Decode 2ⁿ-level quantized integer inputs to floating-point outputs.
`uencode`	Quantize and encode floating-point inputs to integer outputs.

`fdatool`	Open the Filter Design and Analysis Tool.
`fvtool`	Open the Filter Visualization Tool.
`sptool`	Interactive digital signal processing tool (SPTool).
`wintool`	Open the Window Design and Analysis Tool.
`wvtool`	Open the Window Visualization Tool.