Let xt = sin(10t) be a signal to be sampled, processed as a discrete-time signal, and converted back to continuous-time. Model the sampled signal as
xst = xt * pt
where the sampling function, with sampling interval T = 0.125, is an impulse train
pt = 8t - nT
Then the sampled signal is converted back to continuous-time through a reconstruction filter
xt = xt * hRt
The reconstruction filter cuts off at half the sampling frequency and has frequency response
H(w) = T * rect(w)
Sketch the magnitude spectra of the following signals:
a. The input signal: x(t)
b. The sampled signal: x(t)
c. The reconstructed signal: x(t)