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介绍一种采用自适应差分脉冲编码调制（ＡＤＰＣＭ）的新型可变比特率编码方案，其特点是：增加了静默检测控制和１ｂｉｔ抽样编码，并给出用差值功率控制码率的公式和两种信元装配方法，其平均速率仅为６４ｋｂｉｔ／ｓ的１／３以下，而质量与ＰＣＭ编码几乎相当．
A novel variable bit rate coding scheme using Adaptive Differential Pulse Code Modulation (ADPCM) is introduced. The scheme is characterized by adding silence detection control and 1-bit sampling coding, and gives the formula of rate control with differential power control and two The kind of cell assembly method, the average rate of only 64kbit / s 1/3 or less, while the quality and almost the same PCM coding.