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What is the stop band gain of a low pass filter with δS as the pass band attenuation?

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What is the stop band gain of a low pass filter with δS as the pass band attenuation?

(a) -20log(1- δS)

(b) -20log(δS)

(c) 20log(δS)

(d) 20log(1- δS)

The question was asked by my school teacher while I was bunking the class.

This question is from Specifications and Classification of Analog Filters topic in portion Digital Filters Design of Digital Signal Processing

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Right choice is (c) 20log(δS)

To explain: If δS is the stop band attenuation, then the stop band gain is given by the formula 20log(δS).

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