From a discrete-time signal x(n) with Fourier transform X(?). Shown in figure determine and sketch the Fourier transform of the following signals: Note that y1 (n) = x (n)s(n), where s(n) = { . . . 0, 1, 0, 1, 0, 1, 0, 1 . . . }

n even n odd r(n). (a) vi (n) = 0. (b) y;(n) = x(2n) x(n/2). n even n odd (c) y(n) 0. Xta)