Sampling at subnyqvist frequencies

1. What is sub Nyquist sampling?
2. What happens if you sample at Nyquist frequency?
3. What should be the sampling frequency?
4. What is the effect of sampling in frequency domain?

What is sub Nyquist sampling?

Sub-Nyquist. sampling, also known as compressive sampling or compressed. sensing, refers to the problem of recovering signals by samples. much fewer than suggested by Nyquist rate.

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.

What should be the sampling frequency?

The sampling frequency or sampling rate, f_s, is the average number of samples obtained in one second, thus f_s = 1/T. Its unit is sample per second or hertz e.g. 48 kHz is 48,000 samples per second.

What is the effect of sampling in frequency domain?

The sampling theorem essentially says that a signal has to be sampled at least with twice the frequency of the original signal. Since signals and their respective speed can be easier expressed by frequencies, most explanations of artifacts are based on their representation in the frequency domain.