DDS is digital synthesizer technique.
DDS是一种数字合成技术。
The multitone digital synthesizer is employed to simulate the spectra of ocean return signal.
该方案通过多频点数字合成技术可以准确模拟海面回波波谱；
And while programmed on DSP, we modulated data by the way of Direct Digital Synthesizer (DDS).
利用直接数字合成(DDS)技术完成对数据的调制。
A design scheme is proposed for a direct digital synthesizer (DDS) used in digital video encoders.
提出了一种应用于数字视频编码器中直接数字频率合成器(DDS)的设计方案。
The realization of direct digital synthesizer (DDS) by FPGA based on the principle of fraction division is introduced.
采用现场可编程门阵列（FPGA）基于小数分频器的原理，实现直接数字式频率合成器（DDS）。
Direct Digital Synthesizer (DDS) has the advantages of high frequency resolution, rapid frequency change rate and low phase noise.
直接数字频率合成器dds具有极高的分辨率、频率转换速度快、相位噪声低等优点。
Using DDS (Direct Digital Synthesizer) technique under control of single-chip computer, electronic-tunable wavelength scanning is realized.
系统采用计算机控制下的直接数字频率合成(DDS)技术，实现电调谐波长扫描。
Direct digital synthesizer (DDS) is a kind of new frequency synthesizer technique. With it signal parameter can be switched into signal wave.
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。
In this paper a method of designing and implementing Field Programmable Gate Array (FPGA) digital modulator based on the improved Direct digital Synthesizer (DDS) technology is presented.
提出了一种基于改进直接数字频率合成(DDS)技术的现场可编程门阵列(FPGA)数字调制器设计与实现方法。
The direct digital synthesizer (DDS) is used to sweep frequency for a sandwich piezoelectric transducer two admittance circles of the transducer about two different resonance frequencies is measured.
利用直接数字合成器(DDS)对夹心式换能器进行扫频，测得两个不同共振频率附近的导纳圆。
Musical Instrument Digital interface, or MIDI, is a communication interface provided on virtually every synthesizer made today.
音乐设备数字接口，或称MIDI，实际上是为目前制造的各种合成器提供的一种通信接口。
The zero-crossings of the AC voltage and digital frequency synthesizer are used in solving the two main problems in frequency hopping system-synchronization and fast frequency synthesizing.
利用电力系统三相交流电压过零点和高速数字频率合成器解决了跳频系统中同步和快速频率合成的两个关键问题。
The paper introduced the working principle of the direct digital frequency synthesizer (DDS) and its spurious analysis is performed.
文章介绍了直接数字频率合成器(DDS)的基本工作原理，同时对其杂散进行了分析。
The design of direct digital frequency synthesizer(DDFS)in the way of local carrier demodulation is mainly introduced.
文章重点讨论了本地载波解调中的直接数字频率合成器（DDFS）模块的设计。
An area-efficient design proposal of a direct digital frequency synthesizer is presented.
提出一种新的面积优化的直接数字频率合成器设计方案。
At first, this paper described the basic structure, working principle, sources of spurious signals and characteristics of output spectrum, of direct digital frequency synthesizer (DDS).
首先分析直接数字频率合成器(DDS)的基本结构、工作原理、杂散来源、输出频谱特性。
It has important significance in the design of high purity spectrum agile signal synthesizer and frequency synthesizer in military digital communication equipment.
这对于高纯频率捷变合成信号源和军用数字通信设备中频率合成器的设计具有重要意义。
The spectrumcharacteristic of the direct digital frequency synthesizer(DDS )is mainly stud-ied in this paper.
着重研究了直接数字式频率合成器（DDS）的频谱特性。
The paper discusses a prototype of direct digital frequency synthesizer(DDFS) controlled by microcomputer.
本文介绍一个微机可控直接数字频率合成器（DDFS）的实验样机。
A combined tuning technique of digital tuning and analog tuning is used to improve the phase noise of frequency synthesizer by decreasing the gain of VCO.
该频率综合器采用模拟调谐和数字调谐相结合的技术来提高相位噪声性能。
According to the characteristics and the requirements of telemetry and telecontrol system, a digital frequency source was developed with frequency synthesizer.
本文根据无人机测控系统数据链的特点及对测控系统的要求，提出了采用频率合成技术实现数字频率源的方案。
The USM driving control system based on digital signal processor was designed. The digital wave synthesizer was used as the signal generator, and the full-bridge inverter was used in power amplifier.
设计了基于数字信号处理器的超声电机驱动控制系统，以数字波合成器作为超声信号发生器，以全桥逆变器为功放。
A digital frequency synthesizer without ROM look up table is presented, a piecewise linear interpolation scheme is used to approximate a sinusoid function.
该方法使用具有分段连续的线性分段来近似正弦函数曲线的第一象限部分，根据正弦曲线的对称性，构成完整的正弦曲线。
The phase locked loop (PLL) frequency synthesizer for digital tuning system(DTS), which is used in DTS of car radio receiver, is presented.
针对一个汽车音响收音数字调谐系统的实例，介绍了一种广播用双波段锁相环频率合成芯片的设计方法。
We also introduced some concept of digital radio, including digital direction synthesizer (DDS) and digital down conversion (DDC) and digital filter.
介绍了数字直接合成器 （DDS）、数字下变频器 （DDC）、数字滤波器等数字无线电经常用到的概念 。
The structure and principles of Direct Digital Frequency Synthesizer is introduced, and each constituent is theoretically analyzed, and also a detailed design based on FPGA is given.
介绍了直接数字频率合成器的基本组成及设计原理，并对各组成部分进行了理论分析，给出了基于FPGA的具体设计方 案及实现方法。
The structure and principles of Direct Digital Frequency Synthesizer is introduced, and each constituent is theoretically analyzed, and also a detailed design based on FPGA is given.
介绍了直接数字频率合成器的基本组成及设计原理，并对各组成部分进行了理论分析，给出了基于FPGA的具体设计方 案及实现方法。
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