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enter image description hereI can't find the LCCDE equation of this system. I try to reduce but thing will get complicated.

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    \$\begingroup\$ What is the LCCDE equation? What does the 'D' block stand for? \$\endgroup\$
    – Renan
    Dec 7, 2014 at 20:12
  • \$\begingroup\$ Linear Constant Coefficient Difference Equation(s) \$\endgroup\$ Dec 7, 2014 at 20:27

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I assume D is a "sample" delay making (e.g.) e[n] into e[n-1]. Use the standard form for a delay of the multiplier \$Z^{-1}\$ and just treat it like algebra i.e.

e[n-1] = e[n]\$\cdot Z^{-1}\$

The rest should be easy.

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