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RMS amplitude of a sinusoid

  1. Sep 13, 2012 #1
    Q: A single sinusoidal signal is found in a large amount of noise. If the RMS value of the noise is 0.5 volts and the SNR is 10 dB, what is the RMS amplitude of the sinusoid?

    I've related the question to the following equation: SNR=20log(singal/noise)dB

    My answer is 1.58 volts, BUT I'm not entirely sure if that is what they are asking for. Just looking for a little guidance on the question.
  2. jcsd
  3. Sep 13, 2012 #2


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    Staff: Mentor

    Hi TomUIC. http://img96.imageshack.us/img96/5725/red5e5etimes5e5e45e5e25.gif [Broken]

    20.log(1.58/0.5) = 10 dB so your answer looks right. :smile:
    Last edited by a moderator: May 6, 2017
  4. Sep 13, 2012 #3
    Hmmmm ... the answer is exactly 10 ...... homework?
  5. Sep 13, 2012 #4
    Yes homework, what relationship am I missing? I'm new to this area so any help is appreciated.
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