tfrideal.tex

时频分析的工具包

% 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{tfrideal}
\hspace*{-1.6cm}{\Large \bf tfrideal}

\vspace*{-.4cm}
\hspace*{-1.6cm}\rule[0in]{16.5cm}{.02cm}
\vspace*{.2cm}

{\bf \large \fontfamily{cmss}\selectfont Purpose}\\
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\begin{minipage}[t]{13.5cm}
Ideal TF-representation for given instantaneous frequency laws.
\end{minipage}
\vspace*{.3cm}

{\bf \large \fontfamily{cmss}\selectfont Synopsis}\\
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\begin{minipage}[t]{13.5cm}
\begin{verbatim}
[tfr,t,f] = tfrideal(iflaws)
[tfr,t,f] = tfrideal(iflaws,t)
[tfr,t,f] = tfrideal(iflaws,t,N)
[tfr,t,f] = tfrideal(iflaws,t,N,trace)
\end{verbatim}
\end{minipage}
\vspace*{.5cm}

{\bf \large \fontfamily{cmss}\selectfont Description}\\
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\begin{minipage}[t]{13.5cm}
        {\ty tfrideal} generates the ideal time-frequency representation
        corresponding to the instantaneous frequency laws of the components
        of a signal.\\

\hspace*{-.5cm}\begin{tabular*}{14cm}{p{1.5cm} p{8.5cm} c}
Name & Description & Default value\\
\hline
        {\ty iflaws} & {\ty (M,P)}-matrix where each column corresponds to
                 the instantaneous frequency law of an {\ty (M,1)}-signal.
                 These {\ty P} signals do not need to be present at the same time
		 instants. The values of {\ty iflaws} must be
		 between 0 and 0.5\\ 
        {\ty t}      & time instant(s)      & {\ty (1:M)}\\
        {\ty N}      & number of frequency bins & {\ty M}\\
        {\ty trace}  & if nonzero, the progression of the algorithm is shown
                                          & {\ty 0}\\
     \hline {\ty tfr}    & output time-frequency matrix, of size {\ty (N,length(t))}\\
        {\ty f}      & vector of normalized frequencies\\

\hline
\end{tabular*}
\vspace*{.2cm}

When called without output arguments, a contour plot of {\ty tfr} is
automatically displayed on the screen.
\end{minipage}
\vspace*{.5cm}

{\bf \large \fontfamily{cmss}\selectfont Example}
\begin{verbatim}
         N=140; t=0:N-1; [x1,if1]=fmlin(N,0.05,0.3); 
         [x2,if2]=fmsin(70,0.35,0.45,60);
         if2=[zeros(35,1)*NaN;if2;zeros(35,1)*NaN];
         tfrideal([if1 if2]); 
\end{verbatim}
\vspace*{.5cm}

{\bf \large \fontfamily{cmss}\selectfont See Also}\\
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\begin{minipage}[t]{13.5cm}
{\ty plotifl, plotsid} and all the {\ty tfr*} functions.
\end{minipage}