Quick question - Noise margin and SNR

Discussion in 'Broadband' started by Daniel, Mar 23, 2006.

  1. Daniel

    Daniel Guest

    Possibly a stupid question Do noise margin and SNR mean exactly the same
    thing? And if so are there any other words which mean the same thing I
    should know of?

    Thanks

    Dan
     
    Daniel, Mar 23, 2006
    #1
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  2. Daniel

    ato_zee Guest

    AFAIK - You can measure noise in the absense of a
    signal, and you can measure the signal, thus determine
    the SNR. SNR is a measurable quantity.

    OTOH Noise margin as generally used means how
    much the signal has to be greater than the noise
    for a system to work, or acceptably work.
    So, for instance, for satellite television, a better
    LNB by contributing less noise, will give a
    less picture noise, as will a better receiver front
    end if it contributes less noise than a competitors
    product. The noise margin is therefore subjective,
    what you are prepared to accept, and equipment
    subject, how good the equipment copes with a
    not perfect signal. So noise margin has to be
    qualified it is not a simple measureable ratio.

    So no, they are not EXACTLY the same.
     
    ato_zee, Mar 24, 2006
    #2
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  3. Daniel

    P H Guest

    P H, Mar 25, 2006
    #3
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