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Which of the following is a digital-to-analog conversion process?

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Which of the following is a digital-to-analog conversion process?

(a) Staircase approximation

(b) Linear interpolation

(c) Quadratic interpolation

(d) All of the mentioned

I have been asked this question during an online exam.

The doubt is from A2D and D2A Converters in chapter DSP – Basic Signaling of Digital Signal Processing

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Correct option is (d) All of the mentioned

Easiest explanation: The process of joining in terms of steps is known as staircase approximation, connecting two samples by a straight line is known as Linear interpolation, connecting three samples by fitting a quadratic curve is called as Quadratic interpolation.

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