Nyquist Frequency Confusion

1. What is the Nyquist frequency formula?
2. What does the Nyquist frequency represent?
3. What happens if you sample at Nyquist frequency?
4. Why Nyquist rate is 2 times?

What is the Nyquist frequency formula?

The frequency f_n = 1/2Δt is called the Nyquist frequency. When spectra are presented for digital data, the highest frequency shown is the 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 happens if you sample at Nyquist frequency?

It can be seen that by sampling at the Nyquist rate, we can get the frequency information about the signal. However, to faithfully reconstruct the signal, we have to increase the sampling rate even more.

Why Nyquist rate is 2 times?

If the signal contains high frequency components, we will need to sample at a higher rate to avoid losing information that is in the signal. In general, to preserve the full information in the signal, it is necessary to sample at twice the maximum frequency of the signal. This is known as the Nyquist rate.