begin{tikzpicture}[
block/.style={draw, minimum width=10mm, minimum height=6mm},
sum/.style={circle, draw, minimum size=6mm, inner sep=0pt,
node contents={huge$+$}},
mult/.style={circle, draw, minimum size=6mm, inner sep=0pt,
node contents={huge$times$}},
>=Stealth,
node distance=12mm and 10mm]
node (b1) [block]              {$E$};
node (b2) [block,below=of b1] {$E$};
node (b3) [block,below=of b2]  {$E$};
 node (b4) [block,below=of b3]  {$E$};
 coordinate[left=of $(b1.west)!1.5!(b2.west)$] (in);
 coordinate[left=of $(b1.east)!1.5!(b2.east)$] (out);
 node (m)  [mult, right=of b2];
 node (m1)  [mult, left=of b2];
 node (s)  [sum,right=of out -| m.west];
 node (b5) [block,right=of s]   {$h_5[n]$};
 %
 draw[<-] (in) -- node[above] {$x[n]$} + (-12mm,0);
 draw[<->] (m1.west)-| (in) |- (b3.west);
  draw[<->] (b1.west) -| (in) |- (b4.west);
  draw[->]   (b1) -| (s);
 draw[->]   (b2) -- (m);
  draw[->]   (m1) -- (b2);
  draw[->]   (m)  -| (s);
  draw[->]   (s)  -- (b5);
  draw[->]   (b5.east)  -- node[above] {$y[n]$} + (12mm,0);
  end{tikzpicture}