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为提高在ＴＭＳ３２０Ｃ８０上开发Ｈ．２６３全软件解码系统的解码速度，减少片内ＲＡＭ与片外数据交换，提出了一种可变长解码（ＶＬＤ）算法．该算法根据Ｃ８０的高速并行处理能力和只有很小片内存储空间等特点，对ＶＬＤ码表进行设计．使用该算法，在Ｃ８０的一个片内ＲＡＭ中就能存放Ｈ．２６３的所有ＶＬＤ码表．为与目前较常用的逐位查找解码树方法和ＲｅｚａＨ方法比较，对ＭｉｓＡｍｅｒｉｃａｎ图象序列的７０帧图象进行实验，其解码速度是逐位查找解码树方法的２倍，比ＲｅｚａＨ方法快９．４％，最终可实现ＣＩＦ格式的１２．５帧／ｓ的解码速率．该方法同样适用于分析中需考虑内存及解码速度的其他系统中．
To improve the development of TMS320C80 The decoding speed of the whole software decoding system reduces the on-chip RAM and off-chip data exchange. A variable length decoding (VLD) algorithm is proposed. According to the C80 high-speed parallel processing capability and only a small on-chip memory space and other characteristics of the VLD code table design. Using this algorithm, H can be stored in an on-chip RAM on the C80. 263 all VLD code tables. Compared with the RezaH method, which is commonly used to search the bit-by-bit decoding tree, the decoding speed of the MisAmerican image sequence is 70 times faster than that of the RezaH method. 4%, finally can realize the decoding speed of 12.5 frames / s in CIF format. This method is equally applicable to other systems in the analysis that require memory and decoding speed.