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stftb >> stftb > Overview of STFTb features

Overview of STFTb features

Scilab Time Frequency Toolbox

Signal generation functions:

Choice of the Instantaneous Amplitude :

amexpo1s One-sided exponential amplitude modulation

amexpo2s Bilateral exponential amplitude modulation

amgauss Gaussian amplitude modulation

amrect Rectangular amplitude modulation

amtriang Triangular amplitude modulation

Choice of the Instantaneous Frequency :

fmconst Signal with constant frequency modulation

fmhyp Signal with hyperbolic frequency modulation

fmlin Signal with linear frequency modulation

fmodany Signal with arbitrary frequency modulation

fmpar Signal with parabolic frequency modulation

fmpower Signal with power-law frequency modulation

fmsin Signal with sinusoidal frequency modulation

gdpower Signal with a power-law group delay

if2phase Generate the phase from the instantaneous frequency

Choice of Particular Signals

altes Altes signal in time domain

anaask Amplitude Shift Keyed (ASK) signal

anabpsk Binary Phase Shift Keyed (BPSK) signal

anafsk Frequency Shift Keyed (FSK) signal

anapulse Analytic projection of unit amplitude impulse signal

anaqpsk Quaternary Phase Shift Keyed (QPSK) signal

anasing Lipschitz singularity

anastep Analytic projection of unit step signal

atoms Linear combination of elementary Gaussian atoms

chirp Evaluate a chirp signal at time t. A chirp signal is a frequency swept cosine wave.

dopnoise Complex Doppler random signal

doppler Complex Doppler signal

klauder Klauder wavelet in time domain

mexhat Mexican hat wavelet in time domain

pulstran Puls generation

sawtooth Generates a sawtooth wave

tftb_window Window generation

griffitc Test signal example C of Griffiths' paper.

Noise Realizations

noisecg Analytic complex gaussian noise

noisecu Analytic complex uniform white noise

Modification

scale Scale a signal using the Mellin transform

sigmerge Add two signals with a given energy ratio in dB

Processing functions

Time-Domain Processing

ifestar2 Instantaneous frequency estimation using AR2 modelisation.

instfreq Instantaneous frequency estimation

loctime Time localization characteristics

Frequency-Domain Processing

ffmt Fast Mellin transform

iffmt Inverse fast Mellin transform

locfreq Frequency localization characteristics

sgrpdlay Group delay estimation

tftb_fft Fast Fourier transform

tftb_ifft Inverse fast Fourier transform

frspec Spectrum

frpowerspec Power spectrum

parafrep parametric frequency representation of a signal.

Linear Time-Frequency Processing

tfrgabor Gabor representation

tfrstft Short time Fourier transform

tfrsurf extract from a time-frequency representation the biggest energy dots

tfristft Inverse Short time Fourier transform.

tffilter Time frequency filtering of a signal.

Bilinear Time-Frequency Processing in the Cohen's Class

tfrbj Born-Jordan distribution

tfrbud Butterworth distribution

tfrcw Choi-Williams distribution

tfrgrd Generalized rectangular distribution

tfrmh Margenau-Hill distribution

tfrmhs Margenau-Hill-Spectrogram distribution

tfrmmce Minimum mean cross-entropy combination of spectrograms

tfrpage Page distribution

tfrpmh Pseudo Margenau-Hill distribution

tfrppage Pseudo Page distribution

tfrpwv Pseudo Wigner-Ville distribution

tfrri Rihaczek distribution

tfrridb Reduced interference distribution (Bessel window)

tfrridbn Reduced interference distribution (binomial window)

tfrridh Reduced interference distribution (Hanning window)

tfrridt Reduced interference distribution (triangular window)

tfrsp Spectrogram distribution

tfrspwv Smoothed Pseudo Wigner-Ville distribution

tfrwv Wigner-Ville distribution

tfrzam Zhao-Atlas-Marks distribution

tfrspbk Smoothed Pseudo K-Bertrand time-frequency distribution.

Bilinear Time-Frequency Processing in the Affine Class

tfrbert Unitary Bertrand distribution

tfrdfla D-Flandrin distribution

tfrscalo Scalogram, for Morlet or Mexican hat wavelet

tfrspaw Smoothed Pseudo Affine Wigner distributions

tfrunter Unterberger distribution, active or passive form

istfraff returns true is method is an affine time frequency representation.

lambdak Evaluate lambda function for Affine Wigner distribution.

Reassigned Time-Frequency Processing

tfrrgab Reassigned Gabor spectrogram

tfrrmsc Reassigned Morlet Scalogram time-frequency distribution

tfrrpmh Reassigned Pseudo Margenau-Hill distribution

tfrrppag Reassigned Pseudo Page distribution

tfrrpwv Reassigned Pseudo Wigner-Ville distribution

tfrrsp Reassigned Spectrogram

tfrrspwv Reassigned Smoothed Pseudo WV distribution

tfrrstan Reassigned Stankovic distribution.

Ambiguity Functions

ambifunb Narrow-band ambiguity function

ambifuwb Wide-band ambiguity function

Post-Processing or Help to the Interpretation

friedman Instantaneous frequency density

holder Estimation of the Holder exponent through an affine TFR

htl Hough transform for detection of lines in images

margtfr Marginals and energy of a time-frequency representation

midpoint Mid-point construction used in the interference diagram

momftfr Frequency moments of a time-frequency representation

momttfr Time moments of a time-frequency representation

plotsid Schematic interference diagram of FM signals

renyi Measure Renyi information

ridges Extraction of ridges from a reassigned TFR

tfrideal Ideal TFR for given frequency laws

Visualization and backup

plotifl Plot normalized instantaneous frequency laws

tfrparam Return the paramaters needed to display (or save) a TFR

tfrqview Quick visualization of a time-frequency representation

tfrsave Save the parameters of a time-frequency representation

tfrview Visualization of time-frequency representations

Other

disprog Display the progression of a loop

divider Find dividers of an integer, closest from the square root of the integer

dwindow Derive a window

integ Approximate an integral

integ2d Approximate a 2-D integral

izak Inverse Zak transform

kaytth Computation of the Kay-Tretter filter

vecmodulo Congruence of a vector

odd Round towards nearest odd value

zak Zak transform

rem Return the remainder of the division x/y

rot90 rotates the given matrix clockwise by 90 degrees

fzero solves the scalar nonlinear equation such that F(X) == 0

d2statio Distance to stationarity

correlmx correlation matrix of a signal

gaussn generates the order n derivative of the gaussian window, centered at frequency f0

imextrac imextrac(Image) extract and isolate dots in a binary image

umaxbert Determination of the maximum value of u for Bertrand distribution.

umaxdfla Determination of the maximum value of u for D-Flandrin distribution.

umaxunte Determination of the maximum value of u for Unterberger distribution.

istfr1 returns true is method is a time frequency representation of type 1 (positive and negative frequencies).

istfr2 returns true is method is a time frequency representation of type 2 (only positive frequencies).

contwtgn computes a continuous wavelet transform.

contwtgnmir Continuous wavelet transform of mirrored 1-D signals

C - Toolbox functions

Time-Frequency representations

Ctfrbj Born-Jordan time-frequency distribution.

Ctfrbud Butterworth time-frequency distribution.

Ctfrcw Choi-Williams time-frequency distribution.

Ctfrgrd Generalized rectangular time-frequency distribution.

Ctfrmh Margenau-Hill time-frequency distribution.

Ctfrmhs Margenau-Hill-Spectrogram time-frequency distribution.

Ctfrmmce Minimum mean cross-entropy combination of spectrograms.

Ctfrpage Page time-frequency distribution.

Ctfrpmh Pseudo Margenau-Hill time-frequency distribution.

Ctfrppage Pseudo Page time-frequency distribution.

Ctfrpwv Pseudo Wigner-Ville time-frequency distribution.

Ctfrri Rihaczek time-frequency distribution.

Ctfrridb Reduced Interference Distribution with Bessel kernel.

Ctfrridbn Reduced Interference Distribution with binomial kernel.

Ctfrridh Reduced Interference Distribution with Hanning kernel.

Ctfrridt Reduced Interference Distribution with Triangular kernel.

Ctfrrsp Reassigned Spectrogram

Ctfrsp Spectrogram Time Frequency distribution

Ctfrspwv Smoothed Pseudo Wigner-Ville time-frequency distribution.

Ctfrstft Short time Fourier transform

Ctfrwv Wigner-Ville time-frequency distribution.

Ctfrzam Zao-Atlas-Marks time-frequency distribution.

Ambiguity plane function

Cambifunb Ambiguity function

Ctfrker Time frequency representation kernel.

Caf2tfr From ambiguity plane to time frequency plane

Miscellanaeous functions

Chtl Hough transform for detection of lines in images..

Ctfrdist Time frequency distance measures

Ctfrreas Time Frequency Representation reassignment

Cwindow Window generation.

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