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