English translation for "ddfs"

提出了一种使用直接数字合成

Example Sentences:

	1.	The drop of cables in number reduces the number of ddfs significantly D )由于电缆的减少，也大大的减少了数字配线架ddf的数量。
	2.	No matter whether in the pdh or sdh transmission network , the use of 2 mbits trunks to connect to the switch needs large amounts of hw equipment , including cable and ddfs 无论是pdh传输网还是sdh传输网，交换机采用2mbits中继与其连接都需要大量的硬件设备，包括电缆和ddf设备。
	3.	The use of these paths simplifies effectively the network and reduces the number of digital distribution frames ( ddfs ) , connecting lines and shelves of 2 mbits terminal boards as well as simplifies maintenance Stm - 1通路的使用，有效地简化了网络，减少了数字配线架ddf和连接线， 2mbits端路板的机架数目减少，并且简化了维护。
	4.	Digital t / r module use dds ( ddfs and ddws ) technique to implement amplitude and phase weighting , it can achive transmitting beamforming in if or lower frequency by using digital method whitch realizes phase control and amplitude weighting 数字t / r组件利用dds技术实现了雷达的信号产生和幅相控制,可以在中频甚至更低的频率上用数字的方法实现幅度加权和相位控制,从而真正地实现相控阵天线发射波束的全数字控制。
	5.	Moreover , look at the transmission machine room . the use of the 2 mbits interface requires a complete set of ddfs whereas the 155 mbits interface only requires a coaxial cabinet without the use of 2 mbits multiplex equipment , greatly reducing the occupancy of machine room space 再来看一下传输机房，采用2mbits接口，需要整列的数字配线架，而采用155mbits接口，只需要一个同轴柜，在传输设备一侧也不再需要2mbits的复用器设备，大大的减少了对传输机房的占用。
	6.	The primary work in this dissertation : 1 . based on the analysis of direct digital synthesis ( dds ) , this dissertation compares the differences and similarities between direct digital waveform synthesizer ( ddws ) and direct digital frequency synthesizer ( ddfs ) . a dds system is presented , and the theoretical analysis and practical implementation of the system is discussed in details 本文所作的主要工作如下: 1 .全面分析了直接数字合成( dds )技术的工作原理,对比了直接数字波形合成( ddws )及直接数字频率合成( ddfs )两种数字波形产生方法,并就其理论设计和工程实践问题进行讨论。
	7.	Based on the results , beijing telecom has forwarded its suggestions to relevant vendors , who in turn have made a number of improvements in their later product versions . with the stm - 1 link as the inter - office trunk , the number of ddfs will be markedly reduced , thus saving floor space in the pit and wiping off distribution - related failures . besides , the number of outgoing trunks will be brought down , thus demanding less maintenance staff and improving the maintenance efficiency 交换机利用stm - 1链路作为局间中继线路，可以减少数字配线架ddf的数量与规模，从而大大节省局房占用面积，解决局房面积紧张的问题；还可大大减少配线数量，去除因配线引起的故障；另外，交换机利用stm - 1链路作为局间中继线路，可以减少出局中继线路数量，从而可以减少维护人员对中继线路进行维护的工作量，提高维护效率。

Similar Words：

"ddf dispersion-decreasing fiber" English translation, "ddf distance decay function" English translation, "ddf-03" English translation, "ddfc" English translation, "ddfi" English translation, "ddg" English translation, "ddg data display generator" English translation, "ddg digital data generator" English translation, "ddg digital data group" English translation, "ddg digital delay generator" English translation