Multiple choice technology

WHICH EQUATION BASICALLY DESCRIBES AN EQUATION OF ALL PASS FILTER ?

  1. (S-a)/( S+b)

  2. S/(S+b)

  3. (S+a)/(S+B)

  4. NONE OF THESE
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An all-pass filter passes all frequencies equally in magnitude but introduces phase shift. Its transfer function has poles and zeros that are mirror images across the imaginary axis. The standard form is (s-a)/(s+a) or (s+a)/(s-a). Option A matches this structure, where the pole and zero have the same real part but opposite signs.

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