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反量化（ＩＱ）和反离散余弦变换（ＩＤＣＴ）是ＭＰＥＧ－２ 中恢复帧内编码系数或差分系数的重要手段．设计了用于ＭＰＥＧ－２ ＭＰ＠ ＭＬ视频解码超大规模集成电路（ＶＬＳＩ）的ＩＱ 和ＩＤＣＴ电路结构，采用ＶＨＤＬ进行描述并通过模拟得以验证．采用全硬件实现的方法，并针对性地提出了相应的硬件电路结构设计，减少了电路规模以适应ＭＰＥＧ－２ＭＰ＠ ＭＬ视频较大的数据量，达到了实时解码的目的．
Inverse quantization (IQ) and inverse discrete cosine transform (IDCT) are important means of recovering intra-frame or differential coefficients in MPEG-2. The IQ and IDCT circuit structures for MPEG-2 MP @ ML Video Decoding VLSI (VLSI) are designed and described using VHDL and verified by simulation. All-hardware method is adopted, and corresponding hardware circuit structure design is pointed out. The circuit scale is reduced to adapt to the larger data volume of MPEG-2MP @ ML video and achieve the purpose of real-time decoding.