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- The radar digitalized receiver is based on Digital Down Conversion (DDC) technology, which is implemented on FPGA. 雷达数字化接收机部分是基于数字下变频(DDC)技术在FPGA上实现的算法研究及工程实现;
- The common approach to implement DDC (Digital Down Conversion) on FPGA is based on a look-up table, which requires a huge volume of ROM to achieve high resolution. 摘要数字下变频的FPGA实现通常都是基于查表的方法，为了达到高精度要求，常常需要耗费大量的ROM资源去建立庞大的查找表。
- Moreover, this paper explores how to make use of DSP, CPLD, Digital down conversion (DDC) device, ect, to construct a SDR IF receiver which can carry out the demodulation function of AM signal if AM demodulationprogram is downloaded. 利用DSP、CPLD、数字下变频器等器件，构造了一个软件无线电中频接收系统，对该系统下载AM解调程序，它可以执行AM信号的解调功能。
- spontaneous parametric down conversion (SPDC) 自发参量下转换
- quadrature digital down conversion(QDDC) 正交数字下变频
- Have a glass of beer to rinse your dinner down. 喝杯啤酒把你吃的晚饭冲下去。
- The machine must break down at this busy hour. 正忙的时候，机器偏偏又坏了。
- The old man stared the uninvited guest up and down. 老人把不速之客上下打量了一番。
- Synthesis, Structures and Up - conversion Luminescence Properties of Two New Organic Laser Dyes 两种新型有机激光染料的合成、结构和上转换发光性质
- Application of CORDIC Algorithm in Digital Down Conversion CORDIC算法在数字下变频中的应用
- He let himself down slowly by means of a tope. 他借助一根绳子慢慢地下来了。
- The deer was peppered with shot all down one side. 那只死鹿的半边身子都被子弹击中。
- The maid did down the walls with a duster. 女佣用掸帚由上而下地刷除四壁上的尘垢。
- But I worked in other ways also; I often accompanied my walks with dramatic dialogues,in which I played many parts; and often exercised myself in writing down conversations from memory. 我也采用其它方式练习写作，比如一边走路，一边进行戏剧性的对话，在对话中我扮演好几个角色，然后再凭着记忆把对话写下来。
- Bind down the ropes around the load on the lorry. 把绕在卡车上货物外面的绳子扎紧。
- He was not a man to sit down with affront. 他并不是一个可以忍受当众侮辱的人。
- One of the fishing boats sank down astern of us. 有一艘渔船在我们后面沉没了。
- He slicks his hair down with oil every day. 他每天搽油把头梳得光溜溜的。
- The chair sagged down under the fat man's weight. 椅子经这胖人一坐便压弯了。
- Our torpedo boats bore down on the enemy cruiser. 我方面鱼雷艇向敌巡洋舰冲去。
