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← Logic & PuzzlesA digital filter's stability is determined by its eigenvalues; which outcome occurs when any eigenvalue's magnitude exceeds one?
A)Filter's computation becomes more precise
B)Output signal decays to zero
C)Filter output becomes unbounded✓
D)Filter's phase response becomes linear
💡 Explanation
The filter becomes unstable if any eigenvalue magnitude is greater than one, because the system's response grows exponentially with each iteration due to the iterative application of the system matrix, therefore the output will become unbounded, rather than remaining stable or decaying.
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