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