说明：  无噪声信源编码（或无损数据压缩）以尽量少的比特数来表示数据对这类数据进行压缩的目标为目的，以便原始数据序列可以完全从压缩序列中恢复。信源编码技术如HUFFMAN编码都属于这类数据压缩方案。这类编码方案没有信息丢失
(PROFESSOR DAVID A. HUFFMAN (1925-1999) WAS A PIONEER IN THE COMPUTER SCIENCE FIELD. HE PASSED AWAY AT THE AGE OF 74 AFTER A 10-MONTH BATTLE WITH CANCER. THROUGHOUT HIS LIFE, HUFFMAN MADE SIGNIF)