The Nyquist frequency

Control Systems in Practice: Nichols Chart, Nyquist Plot, and Bode Plot

What is the Nyquist theorem?

The frequency which, under the sampling theorem, must be exceeded by the sampling frequency is called the Nyquist rate. Determine the Nyquist rate corresponding to each of the following signals: (a) x(t)=1+cos (2,000 π t)+sin (4,000 π t) (b) x(r)=(sin (4,000 π t))/(π t) (c) x(t)={ .(sin (4,000 π t))/(π t))^2 .

if the frequency spectrum of an analog signal has a bandwidth of 500 hz with the lowest frequency at 100 hz what should be the sampling rate according to nyquist theorem 97967