<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
<!DOCTYPE MAN SYSTEM "../../manrev.dtd">
<MAN>
  <LANGUAGE>eng</LANGUAGE>
  <TITLE>Signal</TITLE>
  <TYPE>Scilab Function</TYPE>
  <DATE>April 1993</DATE>
  <SHORT_DESCRIPTION name="Signal"> Signal manual description</SHORT_DESCRIPTION>
  <SECTION label="Filters">
    <ITEMIZE>
      <ITEM label="analpf">
        <SP>: analog low-pass filter</SP>
      </ITEM>
      <ITEM label="buttmag">
        <SP>: squared magnitude response of a Butterworth filter</SP>
      </ITEM>
      <ITEM label="casc">
        <SP>: creates cascade realization of filter</SP>
      </ITEM>
      <ITEM label="cheb1mag">
        <SP>: square magnitude response of a type 1 Chebyshev filter</SP>
      </ITEM>
      <ITEM label="cheb2mag">
        <SP>: square magnitude response of a type 1 Chebyshev filter</SP>
      </ITEM>
      <ITEM label="chepol">
        <SP>: recursive implementation of Chebychev polynomial</SP>
      </ITEM>
      <ITEM label="convol">
        <SP>: convolution of 2 discrete series</SP>
      </ITEM>
      <ITEM label="ell1 mag">
        <SP>: squared magnitude of an elliptic filter</SP>
      </ITEM>
      <ITEM label="eqfir">
        <SP>: minimax multi-band, linear phase, FIR filter</SP>
      </ITEM>
      <ITEM label="eqiir">
        <SP>: design of iir filter</SP>
      </ITEM>
      <ITEM label="faurre">
        <SP>: optimal lqg filter.</SP>
      </ITEM>
      <ITEM label="lindquis">
        <SP>: optimal lqg filter lindquist algorithm</SP>
      </ITEM>
      <ITEM label="ffilt">
        <SP>: FIR low-pass,high-pass, band-pass, or stop-band filter</SP>
      </ITEM>
      <ITEM label="filter">
        <SP>: compute the filter model</SP>
      </ITEM>
      <ITEM label="find_freq">
        <SP>: parameter compatibility for elliptic filter design</SP>
      </ITEM>
      <ITEM label="findm">
        <SP>: for elliptic filter design</SP>
      </ITEM>
      <ITEM label="frmag">
        <SP>: magnitude of the frequency responses of FIR and IIR filters.</SP>
      </ITEM>
      <ITEM label="fsfirlin">
        <SP>: design of FIR, linear phase (frequency sampling technique)</SP>
      </ITEM>
      <ITEM label="fwiir">
        <SP>: optimum design of IIR filters in cascade realization,</SP>
      </ITEM>
      <ITEM label="iir">
        <SP>: designs an iir digital filter using analog filter designs.</SP>
      </ITEM>
      <ITEM label="iirgroup">
        <SP>: group delay of iir filter</SP>
      </ITEM>
      <ITEM label="iirlp">
        <SP>: Lp IIR filters optimization</SP>
      </ITEM>
      <ITEM label="group">
        <SP>: calculate the group delay of a digital filter</SP>
      </ITEM>
      <ITEM label="optfir">
        <SP>: optimal design of linear phase filters using linear programming</SP>
      </ITEM>
      <ITEM label="remezb">
        <SP>: minimax approximation of a frequency domain magnitude response.</SP>
      </ITEM>
      <ITEM label="kalm">
        <SP>: Kalman update and error variance</SP>
      </ITEM>
      <ITEM label="lev">
        <SP>: resolve the Yule-Walker equations :</SP>
      </ITEM>
      <ITEM label="levin">
        <SP>: solve recursively Toeplitz system (normal equations)</SP>
      </ITEM>
      <ITEM label="srfaur">
        <SP>: square-root algorithm for the algebraic Riccati equation.</SP>
      </ITEM>
      <ITEM label="srkf">
        <SP>: square-root Kalman filter algorithm</SP>
      </ITEM>
      <ITEM label="sskf">
        <SP>: steady-state Kalman filter</SP>
      </ITEM>
      <ITEM label="system">
        <SP>: generates the next observation given the old state</SP>
      </ITEM>
      <ITEM label="trans">
        <SP>: transformation of standardized low-pass filter into low-pass, high-pass, band-pass, stop-band.</SP>
      </ITEM>
      <ITEM label="wfir">
        <SP>: linear-phase windowed FIR low-pass, band-pass, high-pass, stop-band</SP>
      </ITEM>
      <ITEM label="wiener">
        <SP>: Wiener estimate (forward-backward Kalman filter formulation)</SP>
      </ITEM>
      <ITEM label="wigner">
        <SP>: time-frequency wigner spectrum of a signal.</SP>
      </ITEM>
      <ITEM label="window">
        <SP>: calculate symmetric window</SP>
      </ITEM>
      <ITEM label="zpbutt">
        <SP>: Butterworth analog filter</SP>
      </ITEM>
      <ITEM label="zpch1">
        <SP>: poles of a type 1 Chebyshev analog filter</SP>
      </ITEM>
      <ITEM label="zpch2">
        <SP>: poles and zeros of a type 2 Chebyshev analog filter</SP>
      </ITEM>
      <ITEM label="zpell">
        <SP>: poles and zeros of prototype lowpass elliptic filter</SP>
      </ITEM>
    </ITEMIZE>
  </SECTION>
  <SECTION label="Spectral estimation">
    <ITEMIZE>
      <ITEM label="corr">
        <SP>: correlation coefficients</SP>
      </ITEM>
      <ITEM label="cspect">
        <SP>: spectral estimation using the modified periodogram method.</SP>
      </ITEM>
      <ITEM label="czt">
        <SP>: chirp z-transform algorithm</SP>
      </ITEM>
      <ITEM label="intdec">
        <SP>: change the sampling rate of a 1D or 2D signal</SP>
      </ITEM>
      <ITEM label="mese">
        <SP>: calculate the maximum entropy spectral estimate</SP>
      </ITEM>
      <ITEM label="pspect">
        <SP>: auto and cross-spectral estimate</SP>
      </ITEM>
      <ITEM label="wigner">
        <SP>: Wigner-Ville time/frequency spectral estimation</SP>
      </ITEM>
    </ITEMIZE>
  </SECTION>
  <SECTION label="Transforms">
    <ITEMIZE>
      <ITEM label="dft">
        <SP>: discrete Fourier transform</SP>
      </ITEM>
      <ITEM label="fft">
        <SP>: fast flourier transform</SP>
      </ITEM>
      <ITEM label="hilb">
        <SP>: Hilbert transform centred around the origin.</SP>
      </ITEM>
      <ITEM label="hank">
        <SP>: hankel matrix of the covariance sequence of a vector process</SP>
      </ITEM>
      <ITEM label="mfft">
        <SP>: fft for a multi-dimensional signal</SP>
      </ITEM>
    </ITEMIZE>
  </SECTION>
  <SECTION label="Identification">
    <ITEMIZE>
      <ITEM label="lattn,lattp">
        <SP>: recursive solution of normal equations</SP>
      </ITEM>
      <ITEM label="phc">
        <SP>: State space realisation by the principal hankel component  approximation method,</SP>
      </ITEM>
      <ITEM label="rpem">
        <SP>: identification by the recursive prediction error method</SP>
      </ITEM>
    </ITEMIZE>
  </SECTION>
  <SECTION label="Miscellaneous">
    <ITEMIZE>
      <ITEM label="lgfft">
        <SP>: computes p = ceil (log_2(x))</SP>
      </ITEM>
      <ITEM label="sinc">
        <SP>: calculate the function sin(2*pi*fl*t)/(pi*t)</SP>
      </ITEM>
      <ITEM label="sincd">
        <SP>: calculates the function Sin(N*x)/Sin(x)</SP>
      </ITEM>
      <ITEM label="%k">
        <SP>: Jacobi's complete elliptic integral</SP>
      </ITEM>
      <ITEM label="%asn">
        <SP>: .TP the elliptic integral :</SP>
      </ITEM>
      <ITEM label="%sn">
        <SP>: Jacobi 's elliptic function with parameter m</SP>
      </ITEM>
      <ITEM label="bilt">
        <SP>: bilinear transform or biquadratic transform.</SP>
      </ITEM>
      <ITEM label="jmat">
        <SP>: permutes block rows or block columns of a matrix</SP>
      </ITEM>
    </ITEMIZE>
  </SECTION>
</MAN>
