Howtosignalprocessing
- What will happen if Nyquist sampling criterion is not satisfied?
- What happens if the sampling frequency is less than the Nyquist limit?
- What will happen when sampling rate is greater than Nyquist rate?
- Why is it important to set the sampling rate higher than the maximum frequency measured?
What will happen if Nyquist sampling criterion is not satisfied?
If the Nyquist theorem is not obeyed, higher frequency information is recorded in too low a sample rate, resulting in aliasing artifacts.
What happens if the sampling frequency is less than the Nyquist limit?
When the sampling frequency drops below the Nyquist rate, the frequencies will crossover and cause aliasing.
What will happen when sampling rate is greater than Nyquist rate?
It is the critical rate of sampling. If the signal xt is sampled above the Nyquist rate, the original signal can be recovered, and if it is sampled below the Nyquist rate, the signal cannot be recovered.
Why is it important to set the sampling rate higher than the maximum frequency measured?
The science behind sample rates goes back to the 1940s, with the development of the Nyquist–Shannon theorem. The theorem states that when the sampling frequency is greater than twice the maximum frequency of the signal being sampled, the original signal can be faithfully reconstructed.
