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