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- The basic principle of using phase locked loop technique to realize the design and analysis of program controlled frequency syntheses was introduced. 本文简要地叙述了应用锁相环路实现信号合成的基本原理。
- admixture frequency synthesize technique 混合式频率合成技术
- Direct Digital Frequency Synthesis(DDS) technique is introduced and its spurious error is mainly studied. 介绍了直接数字频率合成技术以及分析其杂散误差,对相位截断误差和幅度量化误差进行了傅立叶级数分析研究。
- If no frequency synthesis is needed, the DLLs are preferred for the purpose of synchronization. 如果频率合成非必要的需求，在处理同步问题时，延迟锁相迴路是较佳的选择。
- DDS hybrid PLL can take good advantage of both their merit, have become an important area of frequency synthesis. PLL混合频率合成技术能综合两者的优点,已成为现今频率合成领域的重要研究方向。
- The technology of direct digital frequency synthesis(DDS),is a new typed synthesizer technology and signal frequency methods. 直接数字频率合成技术,即DDS,是一种新型的频率合成技术和信号产生方法。
- Direct Digital Frequency Synthesis(DDS) technology is realized on complex programmable logical component(CPLD) with hardware description language. 在复杂可编程逻辑器件(CPLD)上,用硬件语言实现了直接数字频率合成(DDS)技术。
- A UHF instrument which adopted frequency synthesis method used in exploring the partial discharge (PD) in GISs is introduced. 文中介绍一种采用频率合成技术对GIS腔体内放电所产生的甚高频响应进行检测的UHF测量设备。
- Could versus signal passing programme came realize frequency demultiplication, could realize precise frequency synthesis output. 可以对信号通过编程来实现分频，从而可以实现精确的频率合成输出。
- Digital look-up table method for synthesizing periodic signals is the most popular technique for direct digital frequency synthesis. 数字查表法合成周期信号是一种最常用的直接数字频率合成技术。
- B.G.Goldberg, “Analog and Digital Fractional-N PLL frequency Synthesis: A Survey and Update”, Applied Microwave &Wireless, JUN 1999. 叶家毅;“微波分数频率合成器之研制与应用”;国立中正大学电机工程研究所硕士论文;2000.
- The direct digital frequency synthesizes (DDS) to take one kind of new frequency synthesis technology, May realize from the signal parameter to the waveform transformation. 直接数字式频率合成(DDS)作为一种新的频率合成技术,它可以实现从信号参数到信号波形的转换。
- This paper introduces an improved direct digital frequency synthesis(DDFS) realization method based on CORDIC arithmetic,applying CORDIC arithmetic to substitute large SIN ROM to export fine frequency resolution. 提出了一种基于CORDIC算法的改进直接数字频率合成(DDFS)的实现方法,应用CORDIC算法替代了庞大的传统正弦函数ROM,输出高质量的信号。
- Basing on the discussion of principle and characteristic of direct digital frequency synthesis(DDS) and phase-locked loop frequency synthesis(PLL),a design scheme of frequency synthesizer combining direct digital synthesis used for modern radio is given. 介绍了DDS(直接数字频率合成)技术及PLL(锁相环)频率合成技术的工作原理及特点,给出了现代电台设计中基于DDS的频率合成器的设计方案。
- He varied the transmission frequency. 他变换了无线电传送的频率。
- Introduced the DDS basic principle as well as DDS the chip AD9852 structure, the characteristic, and have given based on in the AD9852 digital frequency synthesis system design and the realization. 本文介绍了DDS的基本原理以及DDS芯片AD9852的结构、特点,并给出了基于AD9852的数字频率合成系统中的设计与实现。
- A unit of frequency equal to one cycle per second. 赫兹频率的单位，等于每秒一周
- Fatal accidents have decreased in frequency over recent years. 近年来死亡事故发生的频率已经下降。
- The more the admixture, the lower the concrete strength. 掺量过高时,混凝土的强度降低;
- Quality: Feeding Broadbean,Moisture[max]15%,Admixture[max]2%. 品质：饲料蚕豆，水份[最高]15%25，杂质[最高]2%25。
