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sum of signal noise ratio?

Discussion in 'Electronic Basics' started by hh, Sep 11, 2004.

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  1. hh

    hh Guest

    If you have two system, one SN is a, another is b. If they are summed, what is SN?
    Assuming they can be summed for same properties.


    Hui
     
  2. Hi,
    In the case of two uncorrelated noise sources mixed with
    identical signals of the same amplitude, I think there should be
    a 3dB improvement in S/N ratio. The voltage resulting from two
    such noise signals would be equal to the square-root of their
    sum but the signals alone would add normally.

    That is, uncorrelated noise powers add normally but the sum of
    their voltages do not.


    Cheers - Joe
     
  3. Hi,

    Oops! the last sentence should read -

    That is, uncorrelated noise powers add normally but
    their voltages do not.


    Cheers - Joe
     
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