Let x1(t) and x2(t) be periodic signals with fundamental periods T1 and T2 respectively. Which of the following must be a rational number for x(t)=x1(t)+x2(t) to be periodic?
A. T1+T2
B. T1-T2
C. T1/T2
D. T1*T2
Answer:A
Let x1(t) and x2(t) be periodic signals with fundamental periods T1 and T2 respectively. Which of the following must be a rational number for x(t)=x1(t)+x2(t) to be periodic?
A. T1+T2 B. T1-T2 C. T1/T2 D. T1*T2
Explanation: Let T be the period of the signal x(t)