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Quiz: On oscilloscopes, Part 3

25 Apr 2016  | Martin Rowe

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4. If you logarithmically weight a signal and the result is linear, what does that tell you about the signal?

a. The signal is linear.

b. The signal is amplitude modulated.

c. The signal is frequency modulated.

d. The signal is bandwidth limited.

e. The signal is sinusoidal.

f. The signal is exponential.

g. The signal is triangular.

h. None of the above

weighing signals

Figure 4: Weighing signals

5. The figure below shows the trace of a pulse-modulated carrier, often used to convey information. If the modulation is truly rectangular, then which of the choices below best describes the signal's frequency spectrum?

a. White noise.

b. Sin(x)/x shape centred at the carrier frequency.

c. Odd harmonics of the carrier frequency only.

d. Harmonics of the pulse repetition rate.

e. Sin(x)/x shape centred at the modulation frequency

f. None of the above

pulse modulated carrier

Figure 5: Trace of a pulse-modulated carrier.

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