% Signal Processing Toolbox.
% Version 2.0b  13-Nov-92
% Copyright (c) 1988-92 by The MathWorks, Inc.
%
% Analog lowpass filter prototypes.
%   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.
%
% IIR digital 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.
%
% FIR filter design.
%   fir1       - Window based FIR filter design - low, high, band, stop.
%   fir2       - Window based FIR filter design - arbitrary response.
%   remez      - Parks-McClellan optimal FIR filter design.
%
% 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.
%
% Filter transformations.
%   bilinear   - Bilinear transformation with optional prewarping.
%   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.
%   ss2zp      - State-space to zero-pole conversion.
%   tf2ss      - Transfer function to state-space conversion.
%   zp2ss      - Zero-pole to state-space conversion.
%
% Filter analysis and implementation.
%   abs        - Magnitude.
%   angle      - Phase angle.
%   filter     - Filter implementation.
%   filtfilt   - Zero-phase version of filter.
%   fftfilt    - Overlap-add filter implementation.
%   filtic     - Determine filter initial conditions.
%   freqs      - Laplace transform frequency response.
%   freqz      - Z-transform frequency response.
%   grpdelay   - Group delay.
%   unwrap     - Unwrap phase.
%
% Parametric Modeling.
%   invfreqs   - Analog filter fit to frequency response.
%   invfreqz   - Discrete filter fit to frequency response.
%   prony      - Prony's discrete filter fit to time response.
%   ident      - See also the Identification Toolbox.
%
% Spectral analysis.
%   cceps      - Complex cepstrum.
%   czt        - Chirp-z transform.
%   detrend    - Linear trend removal.
%   fft        - Fast Fourier transform.
%   fftshift   - Swap vector halves.
%   hilbert    - Hilbert transform.
%   ifft       - Inverse fast Fourier transform.
%   czt        - Chirp-z transform.
%   rceps      - Real cepstrum and minimum pahse reconstruction.
%   specplot   - Plot output of spectrum function.
%   specgram   - Spectrogram, for speech signals.
%   spectrum   - Power spectrum estimate, Welch method.
%
% Correlation and convolution.
%   conv       - Convolution.
%   corrcoef   - Correlation coefficients.
%   cov        - Covariance matrix.
%   deconv     - Deconvolution.
%   xcorr      - Cross-correlation function.
%   xcov       - Covariance function.
%
% Two-dimensional signal and image processing.
%   conv2      - 2-D convolution.
%   fft2       - 2-D fast Fourier transform.
%   fftshift   - Swap quadrants of array.
%   ifft2      - Inverse 2-D fast Fourier transform.
%   xcorr2     - 2-D cross-correlation.
%
% 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.
%
% Decimation and interpolation.
%   decimate   - Resample data at a lower sample rate.
%   interp     - Resample data at a higher sample rate.
%   interp1    - General 1-D interpolation.
%
% Other.
%   stem       - Plot discrete data sequence.
%   convmtx    - Convolution matrix.
%   cplxpair   - Order vector into complex conjugate pairs.
%   dftmtx     - Discrete Fourier transform matrix.
%   mpoles     - Identify repeated poles and their multiplicities.
%   polystab   - Polynomial stabilization.
%   residuez   - Z-transform partial fraction expansion.
%   sawtooth   - Sawtooth function.
%   square     - Square wave function.

% Utilities.
%   abcdchk    - Check consistency of (A,B,C,D) set.
%   comb       - Same as stem - for backward compatibility.
%   denf       - Denominator from covariances for YULEWALK.
%   filtdemo   - Filter design demonstration.
%   kratio     - Utility for ELLIP.
%   nargchk    - Check number of M-file arguments.
%   numf       - Find numerator from impulse response for YULEWALK.
%   rcunwrap   - Phase unwrap specific to the real cepstrum.
%   remezdd    - Lagrange interpolation coefficients for REMEZ.
%   vratio     - Utility for ELLIP.
%   Copyright (c) 1982-92 by The MathWorks, Inc.
%   All rights reserved.
