Determine two signals with a scale factor

1. How do you know if two signals are correlated?
2. Can we add two signals?

How do you know if two signals are correlated?

In words, we compute a correlation by multiplying two signals together and then summing the product. The result is a single number that indicates the similarity between the signals x[n] and y[n]. What values can C(x, y) take on, and what does this tell us about the signals x[n] and y[n]?

Can we add two signals?

Signal addition—Two signals x(t) and y(t) are added to obtain their sum z(t). An adder is used. Constant multiplication—A signal x(t) is multiplied by a constant α. A constant multiplier is used.