tfrridbn.tex

STFT相关函数

% This is part of the TFTB Reference Manual.
% Copyright (C) 1996 CNRS (France) and Rice University (US).
% See the file refguide.tex for copying conditions.


\markright{tfrridbn}
\hspace*{-1.6cm}{\Large \bf tfrridbn}

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{\bf \large \fontfamily{cmss}\selectfont Purpose}\\
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\begin{minipage}[t]{13.5cm}
Reduced Interference Distribution with a binomial kernel.
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{\bf \large \fontfamily{cmss}\selectfont Synopsis}\\
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\begin{minipage}[t]{13.5cm}
\begin{verbatim}
[tfr,t,f] = tfrridbn(x)
[tfr,t,f] = tfrridbn(x,t)
[tfr,t,f] = tfrridbn(x,t,N)
[tfr,t,f] = tfrridbn(x,t,N,g)
[tfr,t,f] = tfrridbn(x,t,N,g,h)
[tfr,t,f] = tfrridbn(x,t,N,g,h,trace)
\end{verbatim}
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{\bf \large \fontfamily{cmss}\selectfont Description}\\
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\begin{minipage}[t]{13.5cm}
        Reduced Interference Distribution with a kernel based on the
        binomial coefficients.  {\ty tfrridbn} computes either the
        distribution of a discrete-time signal {\ty x}, or the cross
        representation between two signals. This distribution has the
        following discrete-time continuous-frequency expression :

\[RIDBN_x(t,\nu)=\sum_{\tau=-\infty}^{+\infty} \sum_{v=-|\tau|}^{+|\tau|} 
{1\over 2^{2|\tau|+1}}\ { 2|\tau|+1\choose |\tau|+v+1}\ 
x[t+v+\tau]\ x^*[t+v-\tau]\ e^{-\jmath 4\pi\nu\tau}.\]

\hspace*{-.5cm}\begin{tabular*}{14cm}{p{1.5cm} p{8cm} c}
Name & Description & Default value\\
\hline
        {\ty x}     & signal if auto-RIDBN, or {\ty [x1,x2]} if cross-RIDBN ({\ty
			Nx=length(x)})\\
        {\ty t}     & time instant(s)          & {\ty (1:Nx)}\\
        {\ty N}     & number of frequency bins & {\ty Nx}\\ 
        {\ty g}     & time smoothing window, {\ty G(0)} being forced to {\ty 1}, where {\ty G(f)} is the Fourier transform of {\ty g(t)}
                                         & {\ty window(odd(N/10))}\\ 
        {\ty h}     & frequency smoothing window, {\ty h(0)} being forced to {\ty 1}
                                         & {\ty window(odd(N/4))}\\ 
        {\ty trace} & if nonzero, the progression of the algorithm is shown
                                         & {\ty 0}\\
     \hline {\ty tfr}   & time-frequency representation. \\
        {\ty f}     & vector of normalized frequencies\\
 
\hline
\end{tabular*}
\vspace*{.1cm}

When called without output arguments, {\ty tfrridbn} runs {\ty tfrqview}.
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\newpage

{\bf \large \fontfamily{cmss}\selectfont Example}
\begin{verbatim}
         sig=[fmlin(128,.05,.3)+fmlin(128,.15,.4)]; 
         tfrridbn(sig); 
\end{verbatim}
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{\bf \large \fontfamily{cmss}\selectfont See Also}\\
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all the {\ty tfr*} functions.
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{\bf \large \fontfamily{cmss}\selectfont Reference}\\
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\begin{minipage}[t]{13.5cm}
[1] W. Williams, J. Jeong ``Reduced Interference Time-Frequency
Distributions'' in {\it Time-Frequency Analysis - Methods and
Applications} Edited by B. Boashash, Longman-Cheshire, Melbourne, 1992.
\end{minipage}