Long description: zfig4

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A diagram showing a signal passing through two blocks, each labeled with the function \(z^{-1}\), indicating a time-shift operation.

Alt text: A diagram showing a signal passing through two blocks, each labeled with the function \(z^{-1}\), indicating a time-shift operation.

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  • The diagram depicts a signal flow graph consisting of three main elements connected by directed arrows.
  • On the left, an input signal is labeled as \(\{y_n\}\).
  • This signal passes through the first block, which is labeled with the transformation \(z^{-1}\), representing a one-step time shift.
  • After the first block, the signal is labeled as \(\{y_{n-1}\}\).
  • This signal then passes through a second block, which is also labeled with the transformation \(z^{-1}\).
  • The output of the second block is labeled as \(\{y_{n-2}\}\), indicating a two-step time shift from the initial input.

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