Signal
======

Signal manual description



Filters
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:analpf analog low-pass filter
: :buttmag squared magnitude response of a Butterworth filter
: :casc creates cascade realization of filter
: :cheb1mag square magnitude response of a type 1 Chebyshev filter
: :cheb2mag square magnitude response of a type 1 Chebyshev filter
: :chepol recursive implementation of Chebychev polynomial
: :convol convolution of 2 discrete series
: :ell1 mag squared magnitude of an elliptic filter
: :eqfir minimax multi-band, linear phase, FIR filter
: :eqiir design of iir filter
: :faurre optimal lqg filter.
: :lindquis optimal lqg filter lindquist algorithm
: :ffilt FIR low-pass,high-pass, band-pass, or stop-band filter
: :filter compute the filter model
: :find_freq parameter compatibility for elliptic filter design
: :findm for elliptic filter design
: :frmag magnitude of the frequency responses of FIR and IIR filters.
: :fsfirlin design of FIR, linear phase (frequency sampling technique)
: :fwiir optimum design of IIR filters in cascade realization,
: :iir designs an iir digital filter using analog filter designs.
: :iirgroup group delay of iir filter
: :iirlp Lp IIR filters optimization
: :group calculate the group delay of a digital filter
: :remezb minimax approximation of a frequency domain magnitude
  response.
: :kalm Kalman update and error variance
: :lev resolve the Yule-Walker equations :
: :levin solve recursively Toeplitz system (normal equations)
: :srfaur square-root algorithm for the algebraic Riccati equation.
: :srkf square-root Kalman filter algorithm
: :sskf steady-state Kalman filter
: :system generates the next observation given the old state
: :trans transformation of standardized low-pass filter into low-pass,
  high-pass, band-pass, stop-band.
: :wfir linear-phase windowed FIR low-pass, band-pass, high-pass,
  stop-band
: :wiener Wiener estimate (forward-backward Kalman filter formulation)
: :wigner time-frequency wigner spectrum of a signal.
: :window calculate symmetric window
: :zpbutt Butterworth analog filter
: :zpch1 poles of a type 1 Chebyshev analog filter
: :zpch2 poles and zeros of a type 2 Chebyshev analog filter
: :zpell poles and zeros of prototype lowpass elliptic filter
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Spectral estimation
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:corr correlation coefficients
: :cspect spectral estimation using the modified periodogram method.
: :czt chirp z-transform algorithm
: :intdec change the sampling rate of a 1D or 2D signal
: :mese calculate the maximum entropy spectral estimate
: :pspect auto and cross-spectral estimate
: :wigner Wigner-Ville time/frequency spectral estimation
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Transforms
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:dft discrete Fourier transform
: :fft fast flourier transform
: :hilb Hilbert transform centred around the origin.
: :hank hankel matrix of the covariance sequence of a vector process
: :mfft fft for a multi-dimensional signal
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Identification
~~~~~~~~~~~~~~

:lattn,lattp recursive solution of normal equations
: :phc State space realisation by the principal hankel component
  approximation method,
: :rpem identification by the recursive prediction error method
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Miscellaneous
~~~~~~~~~~~~~

:sinc calculate the function sin(2*pi*fl*t)/(pi*t)
: :sincd calculates the function Sin(N*x)/Sin(x)
: :%k Jacobi's complete elliptic integral
: :%asn .TP the elliptic integral :
: :%sn Jacobi 's elliptic function with parameter m
: :bilt bilinear transform or biquadratic transform.
: :jmat permutes block rows or block columns of a matrix
: