What is the purpose of an anti-aliasing filter in a digital system?

A) To increase the sample rate

B) To prevent aliasing by removing high-frequency components before sampling

C) To amplify the signal

D) To convert digital signals to analog

Answer: B) To prevent aliasing by removing high-frequency components before sampling

Explanation: An anti-aliasing filter is used before sampling to remove high-frequency components from the signal that could cause aliasing, ensuring that the sampled signal accurately represents the original.