The framework of the instument is analyzed firstly , and the paper focuses on the ecg pre - amplifier design , the data acquisition module based - on isa bus with multi channel inputs is realized , the system software that can fulfill the data acquisition , display and communication is also designed . the two patterns of the network communication is introduced in detail 本文首先分析了智能网络型心电图系统的结构，重点叙述了前置隔离型心电图放大器的设计，研制了具有定时采样功能的多信道数据采集系统，编制了集采样、实时波形显示、测量及网络通信等功能于一体的系统软件。其中对心电图仪网络通信部分的两种模式作了详细介绍。
In this article , with the principle of the multi - channels share , the large - scale telephone line expander which can be used not only for more people ( 16 - 32 ) to reach the aim of the telephone line expansion with a few telephone lines ( 4 - 6 ) , but also for every telephone to communicate with any idle telephone line is researched to increase the utilization factor of the channels 本文采用多信道共用技术研制了大规模电话线路扩容器，能使多个用户( 16 32 )共用少数电话线路( 4 6 )实现线路扩容，而且每部话机都可利用其中任一空闲的电话线路进行通信，提高了信道利用率。
Then , the thesis continues to deal with the cause , character and effect on wdm systems of some kinds ofnonlinearities , such as spm , xpm , fwm , srs and sbs , with the emphasis on multi - tunnel nonlinear effects ( xpm , fwm and srs ) . some more reasonable modes for study and various techniques and suggestions to reduce the impairment effects are also provided and discussed 接着本文讨论了各种光纤非线性效应的成因、特性及其对wdm系统传输性能的影响，着重研究光纤中多信道非线性效应( xpm 、 fwm和srs )对wdm光纤传输系统性能的影响，提出了更符合实际情况的非线性传输方程和模型，得出了可供估计这些效应影响程度的示意图，提出抑制其影响的方案和建议。
The large - scale telephone expander can be used for more users ( 16 - 32 ) to expand capacitor with a few telephone lines ( 4 ~ 6 ) based on the principle of multi - channel share and dynamic channel distributed mode . and it is helpful to increase the utilization factor of the channels and decrease the project cost of investment 利用多信道共用原理和动态信道分配方式研制的大规模电话线路扩容器使得多个用户( 16 32 )共用少数电话线路( 4 6 )实现电话扩容，提高了信道利用率，降低了工程投资成本。
At last , in term of the property of wide band of fra , the interference between channels of multi - channel amplification system is discussed . in multi - channel system , the relations between signal - interference ratio and input signal wave power , between signal - interference ratio and the number of channel and between signal - interference ratio and gain of fra have be discussed . the way of restraining the interference is produced 最后结合喇曼放大器宽带宽的特性讨论了在多信道系统中光纤喇曼放大器的串扰问题，研究了在多信道系统情况下，系统中的信扰比与信号输入光功率、信道数以及放大器增益之间的关系，并提出了减小此串扰的方法。
