Multiple choice

Three functions f1 (t), f2 (t) and f3 (t) which are zero outside the interval [0, T] are shown in the figure. Which of the following statements is correct?

  1. f1 (t) and f2 (t) are orthogonal.

  2. f1 (t) and f3 (t) are orthogonal.

  3. f2 (t) and f3 (t) are orthogonal.

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

For two orthogonal signals f(x) and g(x)

$$\int_{- \infty}^{+ \infty} f(x) g(x) dx =0$$

i.e common area between f(x) and g(x) is zero.

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