Question

An experimental analysis of the natural oscillations in a particular structure shows the dominant frequencies of interest appear at below 200 Hz. However, frequency information also exists at 350, 450, and 750 Hz. If the signal is sampled at 400 Hz, how will the information in the aliased frequencies appear in the sampled data. How can one prevent this information from being superposed onto the desired signal?

Answer 1

Answer:

In order to prevent the aliased frequency from we need to sample at  with a sampling frequency that is minimum 2 times the highest frequency where information exit i.e 2 × 750 = 1500 Hz

Explanation:

The explanation is shown on the first and second uploaded image