[Mp4-tech] How to quantize the coefficients in advanced intra coding of h.263+?

[Darui.Sun]

hi, experts,
   In reference encoder of h.263+, the quantization for advanced intra coding is calculated as follows,
     |LEVEL| = (|COF| + QUANT / 2) / (2 * QUANT)
   but in the Test model (for example TMN12)£¬ the equation is as follows,
     |LEVEL| = (|COF| + 3 * QUANT / 4) / (2 * QUANT) 
   Why is the quantization different? could anybody clarify it for me£¿
thanks in advance
sun