【单选题】【消耗次数：1】
常用的压缩编码方法分为无损压缩和有损压缩，下面哪一个属于无损压缩。
①
DCT离散余弦变换编码
②
子带编码
③
模型编码
④
霍夫曼编码
参考答案：
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下列哪些压缩方法是冗余压缩法？（）（1）Huffman编码（2）PCM（3）行程编码（4）Lempel-Zev编码
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