This theorem states that a signal which has a Fourier transform having only frequencies upto a certain maximum value fm, we can obtain the analog signal f(t) from the sampled signal f*(t) by passing the sampled signal f*(t) through a low pass filter provided that the sampling frequency fs is more than twice the maximum frequency fm present in the signal i.e., fs > 2fm.
The required conditions for recovery of the analog signal f (t) from the sampled signal f*(t) are given below:
Fig. 3.26 shows a typical band limited signal.
Fig. 3.26 Typical ...