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 Signal Processing Toolbox.
 Version 3.0a   15-Dec-93
 Copyright (c) 1988-93 by The MathWorks, Inc.
 $Revision: 1.23 $  $Date: 1993/12/15 20:56:30 $

 Waveform generation.
   diric      - Dirichlet (periodic sinc) function.
   sawtooth   - Sawtooth function.
   sinc       - Sinc or sin(pi*x)/(pi*x) function
   square     - Square wave function.

 Filter analysis and implementation.
   abs        - Magnitude.
   angle      - Phase angle.
   conv       - Convolution.
   fftfilt    - Overlap-add filter implementation.
   filter     - Filter implementation.
   filtfilt   - Zero-phase version of filter.
   filtic     - Determine filter initial conditions.
   freqs      - Laplace transform frequency response.
   freqspace  - Frequency spacing for frequency response.
   freqz      - Z-transform frequency response.
   grpdelay   - Group delay.
   impz       - Impulse response (discrete).
   unwrap     - Unwrap phase.
   zplane     - Discrete pole-zero plot.

 Linear system transformations.
   convmtx    - Convolution matrix.
   poly2rc    - Polynomial to reflection coefficients transformation.
   rc2poly    - Reflection coefficients to polynomial transformation.
   residuez   - Z-transform partial fraction expansion.
   sos2ss     - Second-order sections to state-space conversion.
   sos2tf     - Second-order sections to transfer function conversion.
   sos2zp     - Second-order sections to zero-pole conversion.
   ss2sos     - State-space to second-order sections conversion.
   ss2tf      - State-space to transfer function conversion.
   ss2zp      - State-space to zero-pole conversion.
   tf2ss      - Transfer function to state-space conversion.
   tf2zp      - Transfer function to zero-pole conversion.
   zp2sos     - Zero-pole to second-order sections conversion.
   zp2ss      - Zero-pole to state-space conversion.
   zp2tf      - Zero-pole to transfer function conversion.

 IIR digital filter design.
   besself    - Bessel analog filter design.
   butter     - Butterworth filter design.
   cheby1     - Chebyshev type I filter design.
   cheby2     - Chebyshev type II filter design.
   ellip      - Elliptic filter design.
   yulewalk   - Yule-Walker filter design.

 IIR filter order selection.
   buttord    - Butterworth filter order selection.
   cheb1ord   - Chebyshev type I filter order selection.
   cheb2ord   - Chebyshev type II filter order selection.
   ellipord   - Elliptic filter order selection.

 FIR filter design.
   fir1       - Window based FIR filter design - low, high, band, stop.
   fir2       - Window based FIR filter design - arbitrary response.
   firls      - FIR filter design - arbitrary response with transition bands.
   intfilt    - Interpolation FIR filter design.
   remez      - Parks-McClellan optimal FIR filter design.
   remezord   - Parks-McClellan filter order selection.

 Transforms.
   czt        - Chirp-z transform.
   dct        - Discrete cosine transform.
   dftmtx     - Discrete Fourier transform matrix.
   fft        - Fast Fourier transform.
   fftshift   - Swap vector halves.
   hilbert    - Hilbert transform.
   idct       - Inverse discrete cosine transform.
   ifft       - Inverse fast Fourier transform.

 Statistical signal processing.
   cohere     - Coherence function estimate.
   corrcoef   - Correlation coefficients.
   cov        - Covariance matrix.
   csd        - Cross Spectral Density.
   psd        - Power Spectral Density.
   spectrum   - psd, csd, cohere and tfe combined.
   tfe        - Transfer function estimate.
   xcorr      - Cross-correlation function.
   xcov       - Covariance function.

 Windows.
   bartlett   - Bartlett window.
   blackman   - Blackman window.
   boxcar     - Rectangular window.
   chebwin    - Chebyshev window.
   hamming    - Hamming window.
   hanning    - Hanning window.
   kaiser     - Kaiser window.
   triang     - Triangular window.

 Parametric modeling.
   invfreqs   - Analog filter fit to frequency response.
   invfreqz   - Discrete filter fit to frequency response.
   levinson   - Levinson-Durbin recursion.
   lpc        - Linear Predictive Coefficients using autocorrelation method.
   prony      - Prony's discrete filter fit to time response.
   stmcb      - Steiglitz-McBride iteration for ARMA modeling.
   ident      - See also the Identification Toolbox.

 Specialized operations.
   cceps      - Complex cepstrum.
   decimate   - Resample data at a lower sample rate.
   deconv     - Deconvolution.
   demod      - Demodulation for communications simulation.
   interp     - Resample data at a higher sample rate.
   interp1    - General 1-D interpolation. (MATLAB Toolbox)
   medfilt1   - 1-Dimensional median filtering.
   modulate   - Modulation for communications simulation.
   rceps      - Real cepstrum and minimum pahse reconstruction.
   resample   - Resample sequence with new sampling rate.
   specgram   - Spectrogram, for speech signals.
   spline     - Cubic spline interpolation.
   vco        - Voltage controlled oscillator.

 Analog lowpass filter prototypes.
   besselap   - Bessel filter prototype.
   buttap     - Butterworth filter prototype.
   cheb1ap    - Chebyshev type I filter prototype (passband ripple).
   cheb2ap    - Chebyshev ty[pe II filter prototype (stopband ripple).
   ellipap    - Elliptic filter prototype.

 Frequency translation.
   lp2bp      - Lowpass to bandpass analog filter transformation.
   lp2bs      - Lowpass to bandstop analog filter transformation.
   lp2hp      - Lowpass to highpass analog filter transformation.
   lp2lp      - Lowpass to lowpass analog filter transformation.

 Filter discretization.
   bilinear   - Bilinear transformation with optional prewarping.
   impinvar   - Impulse invariance analog to digital conversion.

 Other
   conv2      - 2-D convolution.
   cplxpair   - Order vector into complex conjugate pairs.
   detrend    - Linear trend removal.
   fft2       - 2-D fast Fourier transform.
   fftshift   - Swap quadrants of array.
   ifft2      - Inverse 2-D fast Fourier transform.
   polystab   - Polynomial stabilization.
   stem       - Plot discrete data sequence.
   strips     - Strip plot.
   xcorr2     - 2-D cross-correlation.

 Demonstrations.
   cztdemo    - Chirp-z transform and FFT demonstration.
   filtdemo   - Filter design demonstration.
   moddemo    - Modulation/demodulation demonstration.
   sosdemo    - Second-order sections demonstration.