What is sampling theorem?

Answer Posted / rajesh

Sampling theorem means,The sampling rate of the sampled
signal should be >= to Nyquist rate.Where Nyquist rate means
twice of the max of signal frequency .We can reconstruct the
original signal from the samples at the receiver end only
when the condition(Above) is met.
EX:Let the signal,that u want to sample, max frequency is 20kHZ.
Then Nyquist rate is 2*20kHZ=40kHZ.

Then the sampling rate is >=40kHZ.But generally sampling
rate units are mentioned as "Samples per Sec(Samples/sec)".
So for above example sampling rate is 40,000 samples/sec,if
sampling rate is equal to Nyquist rate.

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