Module SciPy.​signal.​info

Signal Processing Tools

Convolution:

convolve -- N-dimensional convolution. correlate -- N-dimensional correlation. fftconvolve -- N-dimensional convolution using the FFT. convolve2d -- 2-dimensional convolution (more options). correlate2d -- 2-dimensional correlation (more options). sepfir2d -- Convolve with a 2-D separable FIR filter.

B-splines:

bspline -- B-spline basis function of order n. gauss_spline -- Gaussian approximation to the B-spline basis function. cspline1d -- Coefficients for 1-D cubic (3rd order) B-spline. qspline1d -- Coefficients for 1-D quadratic (2nd order) B-spline. cspline2d -- Coefficients for 2-D cubic (3rd order) B-spline. qspline2d -- Coefficients for 2-D quadratic (2nd order) B-spline. spline_filter -- Smoothing spline (cubic) filtering of a rank-2 array.

Filtering:

order_filter -- N-dimensional order filter. medfilt -- N-dimensional median filter. medfilt2 -- 2-dimensional median filter (faster). wiener -- N-dimensional wiener filter.

symiirorder1 -- 2nd-order IIR filter (cascade of first-order systems). symiirorder2 -- 4th-order IIR filter (cascade of second-order systems). lfilter -- 1-dimensional FIR and IIR digital linear filtering.

deconvolve -- 1-d deconvolution using lfilter.

hilbert -- Compute the analytic signal of a 1-d signal. get_window -- Create FIR window.

detrend -- Remove linear and/or constant trends from data. resample -- Resample using Fourier method.

Filter design:

remez -- Optimal FIR filter design. firwin -- Windowed FIR filter design. iirdesign -- IIR filter design given bands and gains. iirfilter -- IIR filter design given order and critical frequencies. freqs -- Analog filter frequency response. freqz -- Digital filter frequency response.

unique_roots -- Unique roots and their multiplicities. residue -- Partial fraction expansion of b(s) / a(s). residuez -- Partial fraction expansion of b(z) / a(z). invres -- Inverse partial fraction expansion.

Matlab-style IIR filter design:

butter (buttord) -- Butterworth cheby1 (cheb1ord) -- Chebyshev Type I cheby2 (cheb2ord) -- Chebyshev Type II ellip (ellipord) -- Elliptic (Cauer) bessel -- Bessel (no order selection available -- try butterod)

Linear Systems:

lti -- linear time invariant system object. lsim -- continuous-time simulation of output to linear system. impulse -- impulse response of linear, time-invariant (LTI) system. step -- step response of continous-time LTI system.

LTI Reresentations:

tf2zpk -- transfer function to zero-pole-gain. zpk2tf -- zero-pole-gain to transfer function. tf2ss -- transfer function to state-space. ss2tf -- state-pace to transfer function. zpk2ss -- zero-pole-gain to state-space. ss2zpk -- state-space to pole-zero-gain.

Waveforms:

sawtooth -- Periodic sawtooth square -- Square wave gausspulse -- Gaussian modulated sinusoid chirp -- Frequency swept cosine signal

Window functions:

boxcar -- Boxcar window triang -- Triangular window parzen -- Parzen window bohman -- Bohman window blackman -- Blackman window blackmanharris -- Minimum 4-term Blackman-Harris window nuttall -- Nuttall's minimum 4-term Blackman-Harris window flattop -- Flat top window bartlett -- Bartlett window hann -- Hann window barthann -- Bartlett-Hann window hamming -- Hamming window kaiser -- Kaiser window gaussian -- Gaussian window general_gaussian -- Generalized Gaussian window slepian -- Slepian window

Wavelets:

daub -- return low-pass filter for daubechies wavelets qmf -- return quadrature mirror filter from low-pass cascade -- compute scaling function and wavelet from coefficients