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I have an exam question about sampling frequency. Actually i really don't get the concept. I have limited sources.

Question:

Bandwith of x(t) 10 kHz

y(t) obtained modulating x(t) with a sinus wave with frequency 30 kHz.

y(t) sampled

a) What is the sampling frequency of y(t) ?

b) z(t)=y(t)+s(t) -> bandwith of s(t) = 40 kHz, what is the sampling frequency of z(t) ?

Could you help me to find a solution ?

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# Sampling frequency

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