plotsid.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{plotsid}
\hspace*{-1.6cm}{\Large \bf plotsid}

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



{\bf \large \fontfamily{cmss}\selectfont Purpose}\\
\hspace*{1.5cm}
\begin{minipage}[t]{13.5cm}
Schematic interference diagram of FM signals. 
\end{minipage}
\vspace*{.5cm}


{\bf \large \fontfamily{cmss}\selectfont Synopsis}\\
\hspace*{1.5cm}
\begin{minipage}[t]{13.5cm}
\begin{verbatim}
plotsid(t,iflaws)
plotsid(t,iflaws,K)
\end{verbatim}
\end{minipage}
\vspace*{.5cm}


{\bf \large \fontfamily{cmss}\selectfont Description}\\
\hspace*{1.5cm}
\begin{minipage}[t]{13.5cm}
        {\ty plotsid} plots the schematic interference diagram of any
        distribution in the affine class which is perfectly localized for
        signals with a power-law group-delay of the form $t_x(\nu)=t_0+c\
        \nu^{K-1}.$ This diagram is computed for any (analytic) FM
        signal. \\
 
\hspace*{-.5cm}\begin{tabular*}{14cm}{p{1.5cm} p{8.5cm} c}
Name & Description & Default value\\
\hline
        {\ty t} & time instants\\
        {\ty iflaws} & matrix of instantaneous frequencies, 
                 with as many columns as signal components\\ 
        {\ty K} & distribution parameter                & {\ty 2}\\ 
        &      {\ty K = 2}   : Wigner-Ville distribution\\ 
        &      {\ty K = 1/2} : D-Flandrin distribution\\
        &      {\ty K = 0 }  : Bertrand (unitary) distribution\\ 
        &      {\ty K = -1}  : Unterberger (active) distribution\\
        &      {\ty K = inf} : Margenhau-Hill-Rihaczek dist.\\
  
\hline
\end{tabular*}

\end{minipage}
\vspace*{1cm}


{\bf \large \fontfamily{cmss}\selectfont Example}\\
\hspace*{1.5cm}
\begin{minipage}[t]{13.5cm}
Here is the interference diagram corresponding to the Bertrand
distribution, for a signal composed of two components : a linear and a
constant frequency modulation\,:
\begin{verbatim}
         Nt=90; [y,iflaw]=fmlin(Nt,0.05,0.25); 
         [y2,iflaw2]=fmconst(50,0.4); 
         iflaw(:,2)=[NaN*ones(10,1);iflaw2;NaN*ones(Nt-60,1)]; 
         plotsid(1:Nt,iflaw,0); 
\end{verbatim}
\end{minipage}
\vspace*{.5cm}


{\bf \large \fontfamily{cmss}\selectfont See Also}\\
\hspace*{1.5cm}
\begin{minipage}[t]{13.5cm}
\begin{verbatim}
plotifl, midpoint, tfrqview, tfrview.
\end{verbatim}
\end{minipage}