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When noise is passed through a narrow band filter, the output of filter should be?(a) triangular(b) square(c) parabolic(d) sinusoidalThe question was asked in an online quiz.This intriguing question comes from Generation of DSBSC Waves in portion Double Sideband Suppressed Carrier Modulation of Analog Communications

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The CORRECT choice is (d) SINUSOIDAL

For explanation I WOULD SAY: Narrow band filter is used to isolate a narrow band of frequencies from a wider bandwidth signal. It is a combination of band pass and band reject filter. When noise gets passed through it, the output of it should be sinusoidal.



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