Multiple choice technology

EQUATION WHICH BEST DESCRIBES AN ALL PASS FILTER IS ?

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

  2. (s)/(S-b)

  3. (s+a)/(s+b)

  4. none of these
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A Correct answer
Explanation

A first-order all-pass filter has the transfer function (S-a)/(S+a) where 'a' is a real positive constant. The given form (S-a)/(S+b) represents an all-pass filter when a = b. All-pass filters pass all frequencies equally but introduce a phase shift that varies with frequency.

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