Our voice activity detection method is simple to be implemented and calculated and has high accuracy, which can work in the real time digital communication network with better signal-noise-ratio.

基于频谱特征的语音激活检测方法易于实现，计算量小且准确率高，适合较高信噪比的实时数字通信网络中。

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Based on the analysis method of the simple intrinsically safe inductive circuit and its discharge current waveform, studied on the intrinsically safe performance of communication and signal cable.

基于简单电感性本质安全电路的分析方法及其放电电流波形，对通信与信号电缆的本质安全性能进行了研究。

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This paper introduces a way of simple place signal communication. The way is proved to be effective by practice. It has the high practical value at present condition of the PLC USES.

本文介绍了一种简易位信号通讯方式，通过实际应用效果理想，它在目前PLC应用现状下有较高的实用价值。

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