Find the sample rate,?

Question

Computer networks

Good afternoon! There is a task. The signal bandwidth is 0.7 - 5.1 kHz. What is the sampling frequency?
Problem by Kotelnikov's theorem. It states that the sampling frequency must be chosen at least twice as high as the maximum value of the signal spectrum. . So the correct answer is 0.7-5.1=-4.4 and 4.4*2=8.8kHz? or just 5.1*2=10.2kHz.?

Answer 1

This refers to the upper frequency in the spectrum, not the band, so the second option.
But for a practical problem, such a minimum frequency may not be enough.

Answer 2

do not confuse the bandwidth with the maximum frequency :)
minimum frequency, left edge of the spectrum - 0.7 kHz
maximum frequency, right edge of the spectrum - 5.1 kHz
If possible, take the sampling frequency with a margin.

Answer 3

The minimum sample rate in your case is 10.2 kHz.