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In SSB modulation system, if signal (cos 30t) is modulated with a carrier signal of frequency 850 rad /sec, then the expression for the lower side band is
  • a)
    sin 850 t
  • b)
    cos 820 t
  • c)
    cos 880 t
  • d)
    –sin 820 t
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
In SSB modulation system, if signal (cos 30t) is modulated with a carr...
m(t) = cos⁡ 30t
m(t) = cos⁡(30t − 90) = sin⁡30t
For lower side band
s(t) = cos⁡30t cos ⁡850t + sin⁡ 30t sin ⁡850t
=cos⁡(850−30)t
= cos⁡ 820t
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In SSB modulation system, if signal (cos 30t) is modulated with a carrier signal of frequency 850 rad /sec, then the expression for the lower side band isa)sin 850 tb)cos 820 tc)cos 880 td)–sin 820 tCorrect answer is option 'B'. Can you explain this answer?
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