% Define some styles for use in Tikz diagrams.

\tikzstyle{simpleblock} = [draw, rectangle, minimum height=2em, minimum width=1em]

\tikzstyle{block} = [
  draw=blue!50!black!50,
  very thick,
  top color=blue!5,
  bottom color=blue!15,
  rounded corners=1.5mm,
  rectangle,
  minimum height=2em,
  minimum width=1em,
  text centered
]

\tikzstyle{mix} = [draw, circle, node distance=1cm, minimum size=0.7cm]

\tikzstyle{sum} = [draw, circle, minimum size=0.3cm, text centered]

\tikzstyle{gain} = [isosceles triangle, draw, sharp corners, scale=0.8, anchor=center]
