Let x(t) = t[u(t) − u(t −1)], we would like to consider its expanded and compressed versions.

(a) Plot x(2t) and determine if it is a compressed or expanded version of x(t).

(b) Plot x(t/2) and determine if it is a compressed or expanded ver-sion of x(t).

(c) Suppose x(t) is an acoustic signal, e.g., a music signal recorded in a magnetic tape, what would be a possible application of the expanding and compression operations? Explain.