6. The auto-correlation function is –
(a) An odd function in t0
(b) An even function in t0
(c) An exponential function in t0
(d) None of the above
7. The auto-correlation function of a signal (t) at to = 0 is equal to –
(a) Zero
(b) Infinite
(c) Average voltage of the signal
(d) Average power of the signal
8. The auto-correlation function of white noise is a –
(a) Step function
(b) Impulse function
(c) Gaussian function
(d) Constant
9. A random process is defined as ergodic if –
(a) All type of ensemble averages are not changeable
(b) All type of ensemble averages are constant
(c) All type of ensemble averages are interchangeable
(d) None of these
10. Audio frequency range lies between –
(a) 20 Hz to 20 kHz
(b) 20 kHz to 200 kHz
(c) 2 MHz to 20 MHz
(d) 20 MHz to 200 MHz
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Analog Communications » Exercise - 14. Which of the following is not true regarding auto-correlation function? (a) It is an average function (b) It is defined only for periodic signals (c) It is measure of both time variation and statistical dependence (d) It is non-unique description of signals- Analog Communications » Exercise - 1 13. In ergodic process : (a) Ensemble and time average are identical (b) Ensemble and time average are different (c) Ensemble and time average are opposite to each other (d) None of the above
- Analog Communications » Exercise - 12. An ergodic process in communication present if many random signals have- (a) Identical time averages (b) Identical ensemble averages (c) Identical time and ensemble averages (d) None of the above
- Analog Communications » Exercise - 17. The auto-correlation function of a signal (t) at to = 0 is equal to - (a) Zero (b) Infinite (c) Average voltage of the signal (d) Average power of the signal
- Analog Communications » Exercise - 19. A random process is defined as ergodic if - (a) All type of ensemble averages are not changeable (b) All type of ensemble averages are constant (c) All type of ensemble averages are interchangeable (d) None of these