Define sampling theorem in time-domain and discuss Nyquist criteria. Differentiate between ideal and natural sampling.

Here are the answers to your questions, with suitable block diagrams where applicable.

Unit 1.0 Pulse Analog Modulation Techniques

1. Define sampling theorem in time-domain and discuss Nyquist criteria. The sampling theorem states that a continuous-time signal can be perfectly reconstructed from its samples if the sampling rate ($f_s$) is greater than twice the highest frequency component ($f_m$) of the signal. The Nyquist criteria specifies this minimum sampling rate as $f_s \ge 2f_m$. Block diagram not suitable.

2. Differentiate between ideal and natural sampling. Ideal sampling uses infinitesimally narrow pulses (impulses) to sample the signal, while natural sampling uses