例句與造句

1. Design of bessel low pass filter in direct digital synthesizer
   直接數(shù)字合成器中貝塞爾低通濾波器設(shè)計(jì)
2. Through the research of direct digital synthesizer ( dds ) used as a divider in phase lock loop ( pll ) , a frequency synthesizer with small frequency resolution ratio and high purity frequency spectrum can be realized
   摘要通過對(duì)直接數(shù)字合成器在鎖相環(huán)路中作為分頻器應(yīng)用的研究，使頻率合成器可以在實(shí)現(xiàn)超細(xì)頻率分辨率的同時(shí)達(dá)到高的頻譜純度。
3. This paper studies the system and hardware design of the arbitrary waveform generator based direct digital synthesizer in detail . and a theoretical analysis of the system performance is also given
   本文主要研究了基于直接數(shù)字合成( directdigitalsynthesizer )技術(shù)的任意波形發(fā)生器( arbitrarywaveformgenerator )的整體方案和核心部分的硬件設(shè)計(jì)。
4. The developed module are the arbitrary waveform generator based on dos ( direct digital synthesizer ) technology as a signal source of testing system and the common testing device such as virtual spectrum analyzer - , virtual digital storage oscilloscopes virtual frequency counter etc
   所開發(fā)的模塊有，采用dds技術(shù)實(shí)現(xiàn)的任意波形發(fā)生器作為測試系統(tǒng)中的信號(hào)源，以及常見的信號(hào)測量設(shè)備，如虛擬頻譜分析儀，虛擬數(shù)字存儲(chǔ)示波器，虛擬頻率計(jì)數(shù)器等虛擬儀器。
5. This paper deals with fundamental principles and characters of direct digital synthesizer ( dds ) , analyzes the principle of dds in modulation , also presents various basic schemes to implement gmsic 4dqpsk and qam , and makes an initial analysis on their performances
   本文介紹了直接數(shù)字頻率合成( directdigitalsynthesizer ， dds )的基本原理及特性，分析了dds用于調(diào)制的原理，并給出了實(shí)現(xiàn)gmsk 、 / 4dqpsk和qam等調(diào)制的多種方案，同時(shí)對(duì)其性能進(jìn)行初步分析。
6. It's difficult to find direct digital synthesizer in a sentence. 用direct digital synthesizer造句挺難的
7. The modulating signal is generated in the way of direct digital synthesizer technology . the signal has many characteristics such as ultra wide frequency bandwidth , ultra high frequency resolution and ultra good phasic continuity , etc . thus it can be achieved the high frequency and amplitude stability of the modulating signal
   本文采用了數(shù)字頻率合成技術(shù)( dds )來產(chǎn)生調(diào)制信號(hào),它具有超寬的頻率帶寬、超高的頻率分辨率和相位連續(xù)性等特點(diǎn),可以實(shí)現(xiàn)聲光調(diào)制信號(hào)的頻率和振幅的高穩(wěn)定性。
8. The paper lays a strong emphasis on discussing the realization of the autocontrol of raster scanning of the scanner in x - y dimension , the " tapping " of the cantilever of the tappingmode afm by a direct digital synthesizer . then a method of parallel communication between dsp and pc in epp mode is given . finally , the author discussed the digital pid closed loop control of the scanner in z - direction , the automatic approaching of the tip using step - motor , and also some electro - magnetic interferences
   論文首先簡單介紹了掃描探針顯微鏡的發(fā)展、分類、工作原理及應(yīng)用；接著對(duì)ti公司的tms320vc5402dsp的特點(diǎn)及外圍擴(kuò)展作了簡單介紹；然后分章節(jié)重點(diǎn)講述了利用vc5402dsp實(shí)現(xiàn)掃描探針顯微鏡的核心部件? ?壓電陶瓷管的x向和y向的光柵掃描控制；借助直接數(shù)字集成器( dds )實(shí)現(xiàn)輕敲式原子力顯微鏡的微懸臂的“輕敲” ； vc5402dsp的主機(jī)接口( hpi )與pc機(jī)在增強(qiáng)并行口( epp )模式下的通信；論文最后還介紹了掃描管z向的數(shù)字pid閉環(huán)控制，步進(jìn)電機(jī)的自動(dòng)進(jìn)針，并對(duì)實(shí)際出現(xiàn)的一些電磁干擾問題作了討論。