查询词典 DDS

The paper study about the interrelated technology of Direct Digital Synthesizer and Arbitrary Waveform Generator.According to that, a three-pass Arbitrary Waveform Generator base on DDS and embedded-computer PC104 is designed.

本文主要研究了直接数字频率合成技术及任意波形发生器的相关技术，设计了基于DDS和PC104嵌入式计算机技术的三通道程控任意波形发生器。

Altera Corporation system to the Cyclone FPGA series of digital platform, microprocessor, bus, Digital Frequency Synthesizer, memory and I / O interface hardware concentrated in an FPGA, the use of direct digital frequency synthesis technology and digital modulation waveforms required to achieve the rise, Using FPGA ROM storage of the DDS waveform table, and make full use of on-chip resources, improve the system's accuracy, stability and robustness.

系统以 ALTERA公司的 Cyclone 系列 FPGA 为数字平台，将微处理器、总线、数字频率合成器、存储器和 I/O 接口等硬件设备集中在一片 FPGA 上，利用直接数字频率合成技术、数字调制技术实现所要求波形的产生，用 FPGA 中的 ROM 储存 DDS 所需的波形表，充分利用片上资源，提高了系统的精确度、稳定性和抗干扰性能。

If You have strange snow texture go to Your Sword of Damocles\Textures folder and delete snow.dds file.

如果您有奇怪的雪纹理转到您的达摩克利斯之剑\素材文件夹，并删除snow.dds文件。

The maindisadvantage of DR and DDS as a photosensitive agents are their poor thermostability, especially inaqueous solutions.

DR和DDS的缺点是热稳定性差，特别是在水中。

The digital frequency source this paper researched uses high integrated DDS chip AD9851 as frequency sources and signal mirac processors AT89C51 as system control center, it can output 10Hz-20MHz signal with high-precision and high stability frequency. The evenness of signal within the range of 10MHz is low to 0.1dB degree, and the smallest step is low to 10Hz frequency.

本课题研究的数字频率源采用高集成度DDS芯片AD9851作为频率源；以单片机AT89C51作为系统的控制中心，实现了10Hz～20MHz的高精度、高稳定度的频率输出。10MHz内信号幅度的平坦度为0.1dB、频率最小步进为10Hz。

RIGOL operates the DDS of own research and development, can control all elements, can show distinct aleatoric weaveform more.

RIGOL操作自立研发的DDS，能够节制到所有元素，更可显示出逼真的任意波形。

This paper bases on frequency-hopped and frequency synthesis theories, and through demonstrating three schemes of frequency synthesis, the paper selects one of these schemes that uses DDS spiriting up PLL and improves on the method according to the practical target and synchronously, the paper analysis the capability of the output signal and the conversion time of the frequency.

本文在对跳频理论及频率合成理论分析的基础上，在讨论三种频率合成方案后，设计完成了一种适于本课题的DDS激励PLL的混合方案，并对频率合成器主要性能中的输出信号的噪声特性和频率转换性能做了研究分析。

A real-timely non-linearity emendating method in the echos of radar based on DDS is discussed. The reason is that the requirement of the radar LFM linearity is more and more high.

由于防撞雷达对信号的调频线性度要求极为苛刻，为此，论文研究了一种基于DDS 在回波信号中进行实时非线性度修正的简易方法。3。

This paper mainly presents several methods in reducing the parasitic sidelobe level in phased arrays, and uses a method for randomizing the phase errors to improve DDS on the condition of a phase truncation.

DDS是参考时钟进行抽样、数字化，经过数字处理产生需要的频率，它的优异性能为频率合成的设计开辟了宽广的前景。

Baseband signal can control by serial each that one-chip computer produce phase place , DDS of generator control and bring in realizing, and the phase locking ring of the integration can produce the signal carrier within AD9856 chip, its frequency is set up through the interface of the outside one-chip computer.

基带信号可以由单片机产生的串行码元控制DDS发生器的相位控制端来实现，而AD9856芯片内部集成的锁相环可以产生载波，其频率也是通过外部单片机的接口来设置。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。