Consider the signal s(t) = I_[-1,1](t) cos(400*pi*t).

a) Find and sketch the baseband signal u(t) that results when s(t) is downconverted as shown in the upper branch of Figure 2.39.

b) The signal s(t) is passed through the bandpass filter with impulse response h(t) = I_[0,1](t)sin(400*pi*t + pi/4). Find and sketch the baseband signal v(t) that results when the filter output y(t) = (s*h)(t) is downconverted as shown in the lower branch of Figure 2.39.

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