[Mp4-tech] CAVLC limits

[Mark Dell'Agnese]

Hello,
I have a couple of questions regarding the level limits imposed on values
that have been transformed and quantized for the INTRA 16x16 case.  In the
JM reference encoder, there is a term, CAVLC_LEVEL_LIMIT, which limits the
absolute value of the transformed and quantized DC coeff's to 2063.  What is
the significance of 2063 (13-bits req'd)?  Why not 2047 which uses a 12-bit
signed number?  
And why isn't this restriction imposed on other coeff's for both 4x4 and
16x16 cases?
Thanks,
Mark.
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