直接数字合成是先进的频率合成技术，给出了直接数字合成器的设计方法和实现技术。
Direct digital synthesis is a kind of advanced technique on frequency synthesis, in this paper, the design and realized technique of DDS is given.
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。
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.
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。
Musical Instrument Digital interface, or MIDI, is a communication interface provided on virtually every synthesizer made today.
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。
It has important significance in the design of high purity spectrum agile signal synthesizer and frequency synthesizer in military digital communication equipment.
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 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.
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 paper introduced the working principle of the direct digital frequency synthesizer (DDS) and its spurious analysis is performed.
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。
The design of direct digital frequency synthesizer(DDFS)in the way of local carrier demodulation is mainly introduced.
提出一种新的面积优化的直接数字频率合成器设计方案。
An area-efficient design proposal of a direct digital frequency synthesizer is presented.
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。
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).
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。
The paper discusses a prototype of direct digital frequency synthesizer(DDFS) controlled by microcomputer.
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。
Direct Digital Synthesizer (DDS) has the advantages of high frequency resolution, rapid frequency change rate and low phase noise.
根据汉语普通话中数字串发音的韵律规则和特点，利用LMA语音合成器，实现了一种全新的数字串报号系统。
Based on the prosodic characteristics of Chinese digit strings and the application of the LMA synthesizer, a new speech synthesis system is introduced in this paper.
本文分析了数字锁相环路的寄生频偏，它是现代通讯系统中频率合成器的重要指标之一。
This paper gives an analysis of parasitic frequency deviation in the digital phase locked loop, which is one of the important specifications of modern communication systems.
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）。
The realization of direct digital synthesizer (DDS) by FPGA based on the principle of fraction division is introduced.
MIDI(乐器数字界面)是用于在电子音乐设备中发送音乐信息的的格式，类似于电子合成器和PC声卡。
The MIDI (Musical Instrument Digital Interface) is a format for sending music information between electronic music devices like synthesizers and PC sound CARDS.
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。
A design scheme is proposed for a direct digital synthesizer (DDS) used in digital video encoders.
介绍了高速中规模集成数字频率合成器、晶体管高频大功率放大器的设计。
The high-speed digital frequency mixer made of medium-scale integrated circuits and the design of a high power transistor amplifier are also presented.
着重研究了直接数字式频率合成器（DDS）的频谱特性。
The spectrumcharacteristic of the direct digital frequency synthesizer(DDS )is mainly stud-ied in this paper.
该解调器由数字混频器、数字频率合成器(DDFS)和低通滤波器构成。
This initial demodulator incorporates a digital mixer, DDFS and low-pass filter.
这些理论，对于设计满足一定信噪比要求的数字波形合成器及对其性能的分析具有指导意义。
These theories provide a guide for designing and analyzing digitally synthesized signals with a specified SNR requirement.
由于相位舍位会导致直接数字频率合成器(DDS)的输出产生杂散，使其频谱特性恶化。
As we know, spurious noise of a DDS resulted from phase truncation degrades its spectral characteristics.
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。
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.
所以CORDIC算法来实现软件无线电直接数字频率合成器有助于节省芯片面积、降低功耗、减少成本。
Thus, software radio DDFS based on CORDIC algorithm can help to reduce chip area, power dissipation and cost.
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.
在第二章中，主要介绍直接数字频率合成器（DDS）的工作原理，对DDS的系统结构，工作原理，技术指标，频谱特性，优缺点进行了阐述。
Then the work theory, system structure, technology index, spectrum characteristic, merits and defects of Direct Digital Synthesis (DDS) are introduced mostly in the second chapter.
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 。
We also introduced some concept of digital radio, including digital direction synthesizer (DDS) and digital down conversion (DDC) and digital filter.
分析比较了各种频率合成技术的优缺点，重点分析了直接数字式频率合成器的原理、结构、频谱以及特点。
Analyze and compare a variety of technologies of frequency synthesis, analyze the principle, structure, spectrum and characteristics of direct digital synthesis.
本文讨论了基于FPGA芯片的直接数字频率合成器(DDS)的设计方法。
This paper talks about the design method of DDS which is based on FPGA chip.
本文讨论了基于FPGA芯片的直接数字频率合成器(DDS)的设计方法。
This paper talks about the design method of DDS which is based on FPGA chip.
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