(a) Let x(t) have the Fourier transform X(jω), and let p(t) be periodic with mental freq...

(a) Let x(t) have the Fourier transform X(jω), and let p(t) be periodic with mental frequency and Fourier series representation

Determine an expression for the Fourier transform of

y(t) = x(t)p(t). (P4.28-1)

(b) Suppose that X(jω) is as depicted in Figure P4.28(a). Sketch the spectrum of y(t) in eq. (P4.28-1) for each of the following choices of p(t):