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Miscellaneous on Digital Signal Processing related Questions and Answers


Question :   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?
1. T1+T2
2. T1-T2
3. T1/T2
4. T1*T2
Answer :   3 - T1/T2  

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