Nyquist Frquency isn't what it is supposed to be

1. What does the Nyquist frequency represent?
2. What will happen if Nyquist sampling criterion is not satisfied?
3. Which is true for Nyquist rate?
4. Is sampling frequency same as Nyquist frequency?

What does the Nyquist frequency represent?

The Nyquist frequency is a type of sampling frequency that uses signal processing that is defined as “half of the rate” of a discrete signal processing system. It is the highest frequency that can be coded for a particular sampling rate so that the signal can be reconstructed.

What will happen if Nyquist sampling criterion is not satisfied?

Figure 8.2(c) shows the case where the Nyquist sampling criteria has not been met and spectral overlap occurs. The spectral overlap is termed aliasing and occurs when . When , the original signal can be reconstructed by using a low-pass digital filter whose pass band is designed to recover |L|.

Which is true for Nyquist rate?

This theorem states that the highest frequency which can be represented accurately is one half of the sampling rate. The Nyquist rate specifies the minimum sampling rate that fully describes a given signal; in other words a sampling rate that enables the signal's accurate reconstruction from the samples.

Is sampling frequency same as Nyquist frequency?

The Nyquist frequency is the bandwidth of a sampled signal, and is equal to half the sampling frequency of that signal.