This paper advance a new algorithm of increment copy based on research of Apache log file,which achieved real-time update of log file on the premise of running normally.

There are three differences between simple copy and value-added copy: conversion of method and purpose being the presupposition;conversion of nature being the index;the author\'s individual understanding of the world being the fundamentality.

Theoretical analysis and circuit implementation of adaptive weighted delta modulation;

This system realizes the collection,transmission and data processing of earthquake wave signal by means of delta modulation,frequency-shifting keying,frequency-division multiplexing technologies.

To meet the increasingly urgent demand of voice communication on ZigBee network,a voice communication scheme based on variant-slope adaptivedelta modulation was proposed.

In view of making use of predictive control approach as reference,the control increment for next step time is determined according to output error,error change and desired trajectory of the output variable at present.

The method called delta modulation (DM) and the ADM for overcoming some disadvantages of the DM are presented.