# Example: Block diagram of Third order noise shaper in Compact Disc Players

Published 2014-05-19 | Author: Ramón Jaramillo

This is a block diagram of a third-order noise shaper, circuit located inside of a compact disc player.

Source: A fundamental introduction to the Compact Disc Player (1994), located in http://www.tc.umn.edu/~erick205/Papers/3011Paper.pdf, page 17 by Grant M. Erickson

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% Title: Block diagram of Third order noise shaper in Compact Disc Players
% Author: Ramón Jaramillo
\documentclass[tikz,14pt,border=10pt]{standalone}
\usepackage{textcomp}
\usetikzlibrary{shapes,arrows}
\begin{document}
% Definition of blocks:
\tikzset{%
block/.style    = {draw, thick, rectangle, minimum height = 3em,
minimum width = 3em},
sum/.style      = {draw, circle, node distance = 2cm}, % Adder
input/.style    = {coordinate}, % Input
output/.style   = {coordinate} % Output
}
% Defining string as labels of certain blocks.
\newcommand{\suma}{\Large$+$}
\newcommand{\inte}{$\displaystyle \int$}
\newcommand{\derv}{\huge$\frac{d}{dt}$}

\begin{tikzpicture}[auto, thick, node distance=2cm, >=triangle 45]
\draw
% Drawing the blocks of first filter :
node at (0,0)[right=-3mm]{\Large \textopenbullet}
node [input, name=input1] {}
node [sum, right of=input1] (suma1) {\suma}
node [block, right of=suma1] (inte1) {\inte}
node at (6.8,0)[block] (Q1) {\Large $Q_1$}
node [block, below of=inte1] (ret1) {\Large$T_1$};
% Joining blocks.
% Commands \draw with options like [->] must be written individually
\draw[->](input1) -- node {$X(Z)$}(suma1);
\draw[->](suma1) -- node {} (inte1);
\draw[->](inte1) -- node {} (Q1);
\draw[->](ret1) -| node[near end]{} (suma1);
\draw
node at (5.4,-4) [sum, name=suma2] {\suma}
% Second stage of filter
node at  (1,-6) [sum, name=suma3] {\suma}
node [block, right of=suma3] (inte2) {\inte}
node [sum, right of=inte2] (suma4) {\suma}
node [block, right of=suma4] (inte3) {\inte}
node [block, right of=inte3] (Q2) {\Large$Q_2$}
node at (9,-8) [block, name=ret2] {\Large$T_2$}
;
% Joining the blocks of second filter
\draw[->] (suma3) -- node {} (inte2);
\draw[->] (inte2) -- node {} (suma4);
\draw[->] (suma4) -- node {} (inte3);
\draw[->] (inte3) -- node {} (Q2);
\draw[->] (ret2) -| (suma3);
\draw[->] (ret2) -| (suma4);
% Third stage of filter:
% Defining nodes:
\draw
node at (11.5, 0) [sum, name=suma5]{\suma}
node [output, right of=suma5]{}
node [block, below of=suma5] (deriv1){\derv}
node [output, right of=suma5] (sal2){}
;
% Joining the blocks:
\draw[->] (suma2) -| node {}(suma3);
\draw[->] (Q1) -- (8,0) |- node {}(ret1);
\draw[->] (8,0) |- (suma2);
\draw[->] (5.4,0) -- (suma2);
\draw[->] (Q1) -- node {}(suma5);
\draw[->] (deriv1) -- node {}(suma5);
\draw[->] (Q2) -| node {}(deriv1);
\draw[<->] (ret2) -| node {}(deriv1);
\draw[->] (suma5) -- node {$Y(Z)$}(sal2);
% Drawing nodes with \textbullet
\draw
node at (8,0) {\textbullet}
node at (8,-2){\textbullet}
node at (5.4,0){\textbullet}
node at (5,-8){\textbullet}
node at (11.5,-6){\textbullet}
;
% Boxing and labelling noise shapers
\draw [color=gray,thick](-0.5,-3) rectangle (9,1);
\node at (-0.5,1) [above=5mm, right=0mm] {\textsc{first-order noise shaper}};
\draw [color=gray,thick](-0.5,-9) rectangle (12.5,-5);
\node at (-0.5,-9) [below=5mm, right=0mm] {\textsc{second-order noise shaper}};
\end{tikzpicture}
\end{document} 