Signal - Signal manual description

FILTERS

• 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
• optfir : optimal design of linear phase filters using linear programming
• 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

Spectral estimation

• 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

Transforms

• 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

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

MISCELLANEOUS

• lgfft : computes p = ceil (log_2(x))
• 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