Long description: zfig4
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.