The LE32R51B is analouge only.
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The LE32R51BD and the LE32R51BDX have both analogue and digital tuners.

I don't think even Samsung are sure what the difference between the BD and the BDX is!
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On my box it says BD/BDX, what does that mean? maybe there is no difference between them and it has XEU?
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I have been labouring over the same querie and have found out a bit more but dont feel i have solved everything.
B is the model which does not include freeview.
BD is the model which does include freeview.
Following a phone call to Samsung they tell me that the X (BDX) denotes a model which has been sold through a retailer eg Comet. They also told me that XEU indicates a model designated for the UK/EU market. Does this help?