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Ajuda do Scilab >> Processamento de Sinais

Processamento de Sinais

• Convolution - Correlation
  • 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
• Filters
  • 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
  • sgolay — Savitzky-Golay Filter Design
  • sgolaydiff — Numerical derivatives computation using Savitzky-Golay filter.
  • sgolayfilt — Filter signal using Savitzky-Golay Filter.
  • 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
• 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
• Spectral estimation
  • 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.
• Transforms
  • idct — Inverse discrete cosine transform.
  • idst — Inverse discrete sine transform.
  • ifft — Inverse fast Fourier transform.
  • 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 of 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
• unwrap — unwrap a Y(x) profile or a Z(x,y) surface. Unfold a Y(x) profile
• xcov — Computes discrete auto or cross covariance

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