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Aide de Scilab >> Traitement du Signal

Traitement du Signal

  • Convolution - intercorrélation
    • conv — discrete 1-D convolution.
    • conv2 — discrete 2-D convolution.
    • convol — convolution
    • convol2d — discrete 2-D convolution, using fft.
    • corr — correlation, covariance
    • hank — covariance to hankel matrix
    • xcorr — Computes discrete auto or cross correlation
  • Filtrage
    • How to design an elliptic filter — How to design an elliptic filter (analog and digital)
    • analpf — create analog low-pass filter
    • buttmag — Power transmission of a Butterworth filter
    • casc — cascade realization of filter from coefficients (utility function)
    • cheb1mag — response of Chebyshev type 1 filter
    • cheb2mag — response of type 2 Chebyshev filter
    • ell1mag — magnitude of elliptic filter
    • eqfir — minimax approximation of FIR filter
    • eqiir — Design of iir filters
    • faurre — filter computation by simple Faurre algorithm
    • ffilt — coefficients of FIR low-pass
    • filt_sinc — samples of sinc function
    • filter — filters a data sequence using a digital filter
    • find_freq — parameter compatibility for elliptic filter design
    • frmag — magnitude of FIR and IIR filters
    • fsfirlin — design of FIR, linear phase filters, frequency sampling technique
    • group — group delay for digital filter
    • hilbert — Discrete-time analytic signal computation of a real signal using Hilbert transform
    • iir — iir digital filter
    • iirgroup — group delay Lp IIR filter optimization
    • iirlp — Lp IIR filter optimization
    • kalm — Kalman update
    • lev — Yule-Walker equations (Levinson's algorithm)
    • levin — Toeplitz system solver by Levinson algorithm (multidimensional)
    • lindquist — Lindquist's algorithm
    • remez — Remez exchange algorithm for the weighted chebyshev approximation of a continuous function with a sum of cosines.
    • remezb — Minimax approximation of magnitude response
    • srfaur — square-root algorithm
    • srkf — square root Kalman filter
    • sskf — steady-state Kalman filter
    • syredi — Design of iir filters, syredi code interface
    • system — observation update
    • trans — low-pass to other filter transform
    • wfir — linear-phase FIR filters
    • wfir_gui — Graphical user interface that can be used to interactively design wfir filters
    • wiener — Wiener estimate
    • wigner — 'time-frequency' wigner spectrum
    • window — compute symmetric window of various type
    • yulewalk — least-square filter design
    • zpbutt — Butterworth analog filter
    • zpch1 — Chebyshev analog filter
    • zpch2 — Chebyshev analog filter
    • zpell — lowpass elliptic filter
  • How To
    • Identification
      • frfit — frequency response fit
      • lattn — recursive solution of normal equations
      • lattp — Identification of MA part of a vector ARMA process
      • mrfit — frequency response fit
      • phc — Markovian representation
      • rpem — Recursive Prediction-Error Minimization estimation
    • Estimation Spectrale
      • cepstrum — cepstrum calculation
      • cspect — two sided cross-spectral estimate between 2 discrete time signals using the correlation method
      • czt — chirp z-transform algorithm
      • mese — maximum entropy spectral estimation
      • pspect — two sided cross-spectral estimate between 2 discrete time signals using the Welch's average periodogram method.
    • Tranformées
      • idct — Inverse discrete cosine transform.
      • idst — Inverse discrete sine transform.
      • ifft — Transformée de Fourier discrète rapide inverse.
      • fft2 — two-dimension fast Fourier transform
      • fftshift — rearranges the fft output, moving the zero frequency to the center of the spectrum
      • hilb — FIR approximation to a Hilbert transform filter
      • ifftshift — inverse de fftshift
    • bilt — bilinear or biquadratic transform SISO system given by a zero/poles representation
    • detrend — remove constant, linear or piecewise linear trend from a vector
    • intdec — Changes sampling rate of a signal
    • sincd — digital sinc function or Dirichlet kernel
    • xcov — Computes discrete auto or cross covariance
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