\documentclass{article}
\usepackage{html,epsfig}
\usepackage{graphicx,color,natbib}
\usepackage[margin=1in]{geometry}
\setlength{\unitlength}{1in}

\begin{document}

\begin{figure}[hbt]
  \begin{center}
    \begin{picture}(7,1.0)
      \put(0.28,0){\epsfig{file = allpasses.eps, width=6in}}
      \put(0,0.42){$x[n]$}
      \put(6.3,0.42){$y[n]$}
    \end{picture}
  \end{center}
  \caption{Test.}
\end{figure}

\end{document}
