diff --git a/doc/codec2.pdf b/doc/codec2.pdf
index 8e81f731..0371ab13 100644
Binary files a/doc/codec2.pdf and b/doc/codec2.pdf differ
diff --git a/doc/codec2.tex b/doc/codec2.tex
index cb03c38a..8cd0b045 100644
--- a/doc/codec2.tex
+++ b/doc/codec2.tex
@@ -51,13 +51,6 @@ pinstyle/.style = {pin edge={to-,thin,black}}
 	\draw (#1,#2-0.25) -- (#1,#2+0.25);
 }
 
-% tikz: draw a multiplier
-\newcommand{\drawMultiplier}[2]{% x, y
-	\draw (#1,#2) circle (0.5);
-	\draw (#1-0.25,#2-0.25) -- (#1+0.25,#2+0.25);
-	\draw (#1-0.25,#2+0.25) -- (#1+0.25,#2-0.25);
-}
-
 \maketitle
 
 \section{Introduction}
@@ -341,6 +334,31 @@ There is nothing particularly unique about this pitch estimator or it's performa
 
 \subsection{Sinusoidal Analysis and Synthesis}
 
+\begin{figure}[h]
+\caption{Block Diagram of the Sinusoidal Encoder}
+\label{fig:encoder}
+\begin{center}
+\begin{tikzpicture}[auto, node distance=2cm,>=triangle 45,x=1.0cm,y=1.0cm, align=center]
+
+\node [input] (rinput) {};
+\node [tmp, right of=rinput,node distance=0.5cm] (z) {};
+\node [block, right of=z,node distance=1.5cm] (window) {Window};
+\node [block, right of=window,node distance=2.5cm] (dft) {DFT};
+\node [block, right of=dft,node distance=3cm,text width=2cm] (est) {Est Amp and Phase};
+\node [block, below of=window] (nlp) {NLP};
+\node [output, right of=est,node distance=2cm] (routput) {};
+
+\draw [->] node[align=left,text width=2cm] {$s(n)$} (rinput) -- (window);
+\draw [->] (z) |- (nlp);
+\draw [->] (window) -- node[below] {$s_w(n)$} (dft);
+\draw [->] (dft) -- node[below] {$S_\omega(k)$} (est);
+\draw [->] (nlp) -| node[below] {$\omega_0$} (est) ;
+\draw [->] (est) -- (routput) node[right] {$\{A_m\}$ \\ $\{\theta_m\}$};
+
+\end{tikzpicture}
+\end{center}
+\end{figure}
+
 \subsection{LPC/LSP based modes}
 
 \subsection{Codec 2 700C}