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Understanding QAM 256 and 128 difference

  1. Sep 15, 2016 #1
    Hi guys, I set HDMI Modulator recently, but here is one question - it has QAM 16/32/64/128/256. What is the practical difference between 128 and 256 for example if I keep resolution and bitrate the same?
  2. jcsd
  3. Sep 15, 2016 #2


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    Gold Member

    Going from 128 to 256 QAM and keeping the bandwidth constant will provide a small increase in data rate but will require a higher Carrier to Noise Ratio.
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