数字频率合成技术

本文采用了数字频率合成技术（DDS）来产生调制信号，它具有超宽的频率带宽、超高的频率分辨率和相位连续性等特点，可以实现声光调制信号的频率和振幅的高稳定性。

The modulating signal is generated in the way of Direct Digital Synthesizer technology .

基于CORDIC算法的高速直接数字频率合成技术的ASIC实现

ASIC Realization of High Speed Direct Digital Frequency Synthesizer Based on CORDIC Algorithm

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。

The technology of direct digital frequency synthesis ( DDS ), is a new typed synthesizer technology and signal frequency methods .

特别是直接数字频率合成技术（DDS）需要快速、复杂、灵活的控制来发挥其优点。

Direct digital frequency synthesis technology ( DDS ) often requires fast , complex and flexible control in order to exert its merits .

直接数字频率合成技术（DFS）一种先进的频率控制技术。

Direct digital frequency synthesis ( DDFS ) is an advanced technique for frequency synthesis .

本文采用了完全数字化的方法，是利用直接数字频率合成技术的原理，并基于DSP的系统实现MSK调制。

The thesis used a fully digital method that employed the principle of direct digital frequency synthesis to realize the modulation based on DSP .

文章主要分析了如何利用基于矢量旋转的CORDIC（COordinationRotationDIgitalComputer）算法实现高速高精度的直接数字频率合成技术（DDS）。

This paper analyses a ASIC method that realizes the high speed and high precision Direct Digital Frequency Synthesizer ( DDS ) with the CORDIC ( Coordination Rotation Digital Computer ) algorithm based on vector rotation .

本文设计了一台高精度程控相移信号发生器，利用直接数字频率合成技术（DDS）的理论，输出频率稳定度高，分辨率高。

This paper designs a high-precision programmable phase shift signal generator using direct digital frequency synthesis ( DDS ) theory , the output high frequency stability , high resolution .

仅用单片FPGA就实现了直接数字频率合成技术（DDS），产生稳幅正弦波，并在数字域实现了AM、FM、ASK、PSK等四类调制信号。

The DDS , Direct Digital Synthesizer , which is implemented by a unique FPGA IC , can provide the stable sine signal with digital AM , FM , ASK , PSK modulation .

本文主要描述利用FPGA现场可编程门阵列器件作为控制核心，结合DDS数字频率合成技术直接形成SPWM脉宽调制波。

Combine with the direct digital synthesizer ( DDS ) technology , use field programmable gate array ( FPGA ) chip as control unit , directly generate the sine pulse width modulation ( SPWM ) .

直接数字式频率合成技术（DDS）是一种先进的全数字频率合成技术，本文基于DDS的相位调制功能，给出了一种DDS数字移相器的设计方案。

Direct digital synthesis ( DDS ) is an advanced all digital frequency synthesis technology , based on the PM function of DDS , this paper gives the design scheme of a DDS digital phase shifter .

通过分析研究直接数字频率合成技术DDS波形发生器的原理与实现，给出了教学实施的具体内容和参考方案。

In this paper , a new teaching scheme on Direct Digital Frequency Synthesis ( DDS ) and its content are presented for reference , based on the analysis on the principle and implementation of DDS .

本系统由FPGA、单片机控制模块、D/A转换电路和低通滤波模块构成，仅用单片FPGA就实现了直接数字频率合成技术（DDS），产生幅度稳定的正弦波。

The system consists of FPGA , monolithic computer control module , D / A conversion circuit and low pass filter module . Only monolithic FPGA is used to realize direct digital frequency synthetic technology , producing sinusoidal wave of stable amplitude .

本文阐述通过直接数字频率合成技术（DDS）用FPGA设计三角载波移相PWM波形的原理和要点，使多电平逆变器控制电路实现全数字化控制，改进了传统设计三角载波移相PWM的方法。

This paper describes the principle of Phase-Shift SPWM designed by Direct Digital Frequency Synthesis ( DDS ) based on FPGA implemented . It realizes full digital control for control circuit of Multilevel converter and amends the way of traditional SPWM design .

直接数字频率合成技术（DDS）的出现是频率合成技术的一次革命。DDS由相位累加器、正弦波形ROM、DAC以及外加滤波器构成。

The discovery of The Direct Digital Frequency Synthesizer is a revolution in the development of frequency synthesis technique , which consists of the phase accumulator , the sine look-up table , the digital to analog converter and the low band filter .

同时该程控智能函数发生器以直接数字频率合成技术（DDS）为基础的，此技术是随着计算机、数字集成电路和微电子技术的发展，在频率合成技术领域的新的突破。

At same time this program-controlled intelligent function generator is on basis of direct digital synthesize technology ( DDS ), and this technology is a breakthrough in the domain of frequency synthesize technology with the development of computer , digital integration circuit and micro-electronically technology .

本论文讨论了直接数字频率合成技术及CORDIC算法，对两者进行了详尽分析之后，论文提出了两种构造这种新颖DDS的方法并其性能进行了分析。

The paper mainly discussed the CORDIC algorithm and the elementary technique of DDS . After giving a thorough analysis of the above two , the paper proposes two de-sign methods of the novel DDS and analysis capabilities of the two .

简单介绍采用CORDIC算法的直接数字频率合成技术。4，简单回顾基于随机梯度迭代的盲均衡算法，重点讨论独立于载波的常模数算法。

There is also an introduction of direct digital frequency synthesis based on CORDIC algorithm . 4 , A review of blind equalization algorithm based on stochastic gradient recursion is proposed , and constant modulus algorithm that independent of carrier is mainly discussed .

计算机仿真分析表明，本文方法的理论重构精度达80dB以上，通过直接数字频率合成技术（DDS）实现的数字正交调制器的实际输出信噪比达65dB以上。

The computer simulation indicates that the theoretical reconstruction accuracy of the method is over 80 dB , the actual ratio of signal to noise of the digital quadrature modulator implemented by direct digital frequency synthesis ( DDS ) is over 65 dB .

软件数字频率合成技术在继电保护测试装置上的应用

Application of Software Digital Frequency Synthesis Technology in Relay Protection Device

双系统架构下的直接数字频率合成技术研究

Research of Direct Digital Frequency Synthesis Technology under Double System Overhead Construction

数字频率合成技术在地球站中的应用

The Application of Digital PLL Frequency Synthesizer in Ground Station

直接数字频率合成技术杂散信号频谱性能分析

Analysis of the spurious spectrums in direct digital frequency synthesizers

基于直接数字频率合成技术的数字调制实现

Realization of Digital Modulation Based on Direct Digital Frequency Synthesis

基于数字频率合成技术的任意波形发生器设计与应用

Design And Apply of Arbitrary Waveform Generator Based On Direct Digital Synthesizing Technology

本文主要讨论了直接数字频率合成技术及其应用。

This thesis mainly discusses the direct digital frequency synthesis technique and its applications .

介绍了基于直接数字频率合成技术的双通道任意波形信号发生器。

The double channel arbitrary wave generator based on direct digital frequency synthesis is introduced .

其次，对实现原理和在设计中需要用到的直接数字频率合成技术进行了深入的分析。

Secondly , the principle and Direct Digital Frequency Synthesis ( DDS ) is analyzed deeply .

程控直接数字频率合成技术在雷达和其他系统中应用非常广泛。

Generated technology of program controlled direct digital frequency has widely been used in Radar and other electronic systems .

采用了直接数字频率合成技术，较大幅度的提高了输出波形的频率；

In order to improve the frequency of the output waveforms , the direct digital synthesizer was applied in this system .