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網(wǎng)絡(luò)型心電圖系統(tǒng)的結(jié)構(gòu),重點(diǎn)敘述了前置隔離型心電圖放大器的設(shè)計,研制了具有定時采樣功能的多信道數(shù)據(jù)采集系統(tǒng),編制了集采樣、實時波形顯示、測量及網(wǎng)絡(luò)通信等功能于一體的系統(tǒng)軟件。其中對心電圖儀網(wǎng)絡(luò)通信部分的兩種模式作了詳細(xì)介紹。
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術(shù)研制了大規(guī)模電話線路擴(kuò)容器,能使多個用戶( 16 32 )共用少數(shù)電話線路( 4 6 )實現(xiàn)線路擴(kuò)容,而且每部話機(jī)都可利用其中任一空閑的電話線路進(jìn)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 接著本文討論了各種光纖非線性效應(yīng)的成因、特性及其對wdm系統(tǒng)傳輸性能的影響,著重研究光纖中多信道非線性效應(yīng)( xpm 、 fwm和srs )對wdm光纖傳輸系統(tǒng)性能的影響,提出了更符合實際情況的非線性傳輸方程和模型,得出了可供估計這些效應(yīng)影響程度的示意圖,提出抑制其影響的方案和建議。
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動態(tài)信道分配方式研制的大規(guī)模電話線路擴(kuò)容器使得多個用戶( 16 32 )共用少數(shù)電話線路( 4 6 )實現(xiàn)電話擴(kuò)容,提高了信道利用率,降低了工程投資成本。
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 最后結(jié)合喇曼放大器寬帶寬的特性討論了在多信道系統(tǒng)中光纖喇曼放大器的串?dāng)_問題,研究了在多信道系統(tǒng)情況下,系統(tǒng)中的信擾比與信號輸入光功率、信道數(shù)以及放大器增益之間的關(guān)系,并提出了減小此串?dāng)_的方法。