本文首先介绍了DDS的基本原理。然后提出用双dds结构实现调频信号数字合成的方法。
This paper first presents the fundamentals of DDS, and then gives a method of accomplishing digital synthesis of FM signals by means of dual DDS structures.
首先简要介绍它的结构和特性，之后重点评述了普鲁蓝的生物合成方法和发酵生产方法。
First of all, the structure and characteristic of Pullulan are briefed. Then the biosynthesis method and fermentative production method for Pullulan are reviewed in detail.
首先介绍了虚拟演播室技术的几个关键：摄像机跟踪系统，蓝背景和虚拟背景，键信号处理与图像合成以及计算机系统；
This paper introduced several keys of virtual studio technology, such as camera tracing system, blue scenery and virtual scenery, key signal transact and picture synthesis.
首先，本文对数字频率直接合成(DDS)技术的特点进行介绍，提出一种基于DDS技术的任意波形发生器(AWG)的改进结构。
First of all, this thesis introduces the features of Direct Digital Frequency Synthesis (DDS) technique and gives a new structure of the Arbitrary Waveform Generators (AWG) base on DDS technology.
首先我们介绍了炔丙醇一般合成方法。
Firstly, we mainly introduces the common methods for the preparation of propargylic alcohols.
本文首先简单介绍了合成孔径雷达（SAR）成像原理，并对以超高速数字信号处理器（DS）为核心的机载合成孔径雷达实时成像处理系统的硬件结构作了描述。
This paper presents the principle of Sythetic Aperture Radar(SAR) imaging and describes the system hardware of airborneSAR real-time digital signal processing system with ultra-high speed DSP .
本文首先介绍了直接数字频率合成技术的原理和结构，并分析了其噪声来源和抑制方法。
Firstly, this paper introduced the principle and structure of direct digital frequency synthesis and analyzed the source and suppression methods of frequency noise.
本文首先介绍了合成孔径聚焦超声成像的基本原理。
At first, the principle of synthetic aperture focusing technique for ultrasonic imaging is introduced in this paper.
首先简要介绍DDS的工作原理及其性能，然后阐述如何利用AD985 1芯片设计一个高精度直接数字式合成频率源。
This paper briefly introduces the basic principles and the performance of DDS. Then it mainly describes how to use AD9851 chip to design a direct digital synthesis frequency source with high accuracy.
首先简要介绍DDS的工作原理及其性能，然后阐述如何利用AD985 1芯片设计一个高精度直接数字式合成频率源。
This paper briefly introduces the basic principles and the performance of DDS. Then it mainly describes how to use AD9851 chip to design a direct digital synthesis frequency source with high accuracy.
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