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２００１年，杜比实验室在ＤｏｌｂｙＰｒｏＬｏｇｉｃ（杜比定向逻辑）的基础上开发出第二代矩阵环绕声解码技术──Ｄｏｌｂｙ Ｓｕｒｒｏｕｎｄ Ｐｒｏ Ｌｏｇｉｃ Ⅱ（简称 ＰＬ Ⅱ）。由于ＰＬ Ⅱ仍是矩阵环绕声技术，所以在声音效果上不及杜比数字ＤＤ（及ＤＴＳ等数字环
In 2001, Dolby Laboratories developed the second-generation matrix surround decoding technology based on Dolby ProLogic (Dolby Pro Logic) - Dolby Surround Pro Logic II (PL II for short). As PL Ⅱ is still matrix surround sound technology, so the sound effect is less than Dolby Digital DD (and digital ring DTS