Figure shows 4 block diagram of a system to recover a sampled signal shown as input.

Blocks A and B can be respectively :

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ESE Electronics 2011 Paper 2: Official Paper
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  1. Zero order hold and low pass filter
  2. Multiplier and high pass filter
  3. Envelop detector and sampler
  4. Tuned circuit and mixer

Answer (Detailed Solution Below)

Option 1 : Zero order hold and low pass filter
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ST 1: UPSC ESE (IES) Civil - Building Materials
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Detailed Solution

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Zero-order hold circuit:

It is a mathematical model of two practical signal Reconstruction done by convention Digital to Analog converter (DAC).

By holding each sample value for one sample interval it converts the discrete signal into an analog signal.

Important Points

Zero-order function  

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