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signal to noise ratio measurement

Discussion in 'Electronic Basics' started by [email protected], Jan 21, 2007.

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  1. Guest

    I was just wondering if there is an easy way to automatically measure a
    signal to noise ratio. I'm looking for a means that doesn't require
    human intervention.

    Thanks.
     
  2. chuck

    chuck Guest

    S+N/N measurements can be automated, more or less. What kinds of
    signals, noise, and channels are you thinking about? What accuracy and
    frequency?

    Chuck
     
  3. Phil Allison

    Phil Allison Guest

    ** Groper in the Dark Alert !


    ** The s/n ratio of an actual signal ( as opposed to an equipment spec) is
    usually continually varying !!!!!

    A good spectrum analyser will take a snapshot of the signal +noise at any
    point in time and then the display can be interpreted ( in most cases ) to
    give the approximate s/n ratio at that moment.

    All depends on the exact nature of the wanted signal and the characteristics
    of the noise.



    ......... Phil
     
  4. neon

    neon

    1,325
    0
    Oct 21, 2006
    An amplifier can have a spec of -90Db power rejection ratio. how you verify is by injecting a signal and measuring the output. then again at 100 mhz and above it can be -10Db then again a 100mhz amp is hard to come by.
     
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