Amateur Extra › E7 Practical Circuits › E7F05
E7F05
How frequently must an analog signal be sampled to be accurately reproduced?
Pick an answer to check it.
Answer: B. At least twice the rate of the highest frequency component of the signal
By the Nyquist rule, you must sample at least twice the highest frequency in the signal. Sampling slower causes aliasing, where frequencies are reproduced incorrectly.
Tip: Nyquist: sample at twice the highest frequency.