Precedence Diagramming Method(PDM) is a method used in activity sequencing.There..

2011年上半年上午试卷综合知识

第 75 题


知识点	DM
章/节	专业英语

Precedence Diagramming Method(PDM) is a method used in activity sequencing.There are four types of dependencies or precedence relationships in PDM. The initiation of the successor activity depends upon the completion of the predecessor activity is called(75).

A. Finish-to-Start

B. Finish-to-Finish

C. Start-to-Start

D. Start-to-Finish

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知识点讲解

· DM

DM（Delta Modulation）即增量调制，又称ΔM调制，是最简单的有损预测编码方法，早期在数字电话中被采用，是一种最简单的差值脉冲编码。实际的采样信号与预测的采样信号的差的极性若为正，则用1表示，反之则用0表示。由于DM编码只用1位对声音信号进行编码，所以DM系统又称1位系统。

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