ddfs meaning in English
提出了一种使用直接数字合成
Examples
- 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。 - 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。 - 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。 - 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。 - 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。