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

F2 Shraddha Neha 12.12.2020 D18

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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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.

F1 Shraddha Neha 22.01.2021 D 6

Important Points

Zero-order function \(= rect\;\left( {\frac{{t - \frac{T}{2}}}{T}} \right)\) 

F1 Shraddha Neha 22.01.2021 D 7

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