Final answer:
To sketch the signal x[n] = δ [n] + δ [n - 3], illustrate two spikes on a discrete time graph: one at n = 0 and another at n = 3, each with an amplitude of 1.
Step-by-step explanation:
The student's question is related to signal processing, specifically the sketching of discrete-time signals. To sketch the signal x[n] = δ [n] + δ [n - 3], we need to represent two discrete impulses on a graph. The first delta function, δ [n], is an impulse at n = 0, and the second delta function, δ [n - 3], is an impulse at n = 3. The amplitude of the delta function is typically 1.
A sketch of this signal will have peaks at n = 0 and n = 3 with an amplitude of 1, and will be zero at all other points. On the horizontal axis, we put the values of n, and on the vertical axis, we have the amplitude of x[n]. The resulting sketch will show two spikes upward at the points n = 0 and n = 3, with no other activity along the rest of the graph.