采用数字锁相技术从噪声中提取有效信号，以减小测量误差。
The digital lock-in technique is used to rather extract the effective signal from the noise and reduce the measurement error.
设计了基于模拟滤波器和基于数字锁相放大技术的两种红外气体传感器的信号处理方法。
Two signal processing methods, one based on analog filters, the other based on digital lock-in amplifying technique, are developed and analyzed.
采用高精度的直接数字频率合成（DDS）和数字锁相环技术，实现了高频率跟踪精度。
DDS and digital phrase-lock technology have been applied in FPGA to improve the accuracy of frequency tracking.
介绍了锁相环(PLL)技术和直接数字式频率合成(DDS)技术的基本工作原理，给出了一种提高DDS输出频率精度及减小其相位截断误差的方法。
This paper introduces the theory of the phase-locked loop (PLL) and the direct digital synthesis (DDS), a method to improve the precision of DDS and reduce its phase truncation error is also given.
数字锁相环路（DPLL）是数字相干解调技术的核心。
The Digital Phase Lock Loop(DPLL)is the core of the coherent demodulation.
提出了一种以复杂可编程逻辑器件（CPLD）和锁相环技术为核心的新型通用数字触发器，对其硬件电路和软件设计进行了详细分析。
To aim at the defect of the simulate trigger and the digital trigger with microcomputer, a new universal digital trigger based on CPLD and PLL is introduced.
以数字延迟锁相环为基础，并采用数模混合技术，实现了带电源控制的数字延迟锁相环。
Based on digital delay-locked loop, the mix signal technique is used to implement the digital delay locked loop with the resource control technique.
数字直放站采用数字中频处理技术方式并通过光纤实现远距离信号传输，此对系统中的锁相源的相位噪声提出了很高的要求。
In digital repeater, the application of digital intermediate frequency technology and realization of optical fiber transmission for distance will require for little Phase Noise of Phase-Locked Source.
重点研究了基于FPGA的全数字锁相环频率跟踪技术和数字化SPWM实现技术。
All digital Phase-Locked Loop frequency tracking and digital SPWM realization technology based on FPGA are emphasized in the research.
首先对直接数字频率合成技术(DDS)和锁相频率合成技术(PLL)的基本原理、特点及相噪特性作了详细的分析。
Firstly the basic theory of DDS and PLL, as well as their characteristics and phase noise properties have been analyzed detailedly.
应用过采样和数字锁相检测技术能提高动态光谱法中光电脉搏波信号的检测精度， 文章对此进行了理论推导。
The precision of measure can be advanced by making use of over-sampling and lock-in amplifying on the pick-up of photoelectric pulse wave in DS detection.
第四章探讨了运用可编程技术设计数字锁相环和数字倍频器的相关问题，为以后电路设计拓展更多的方法。
The chapter 4 discuss some question of the circuit using programmable device like digital phase locked loop and digital frequency multiplier, it can increase the way of circuit design.
第四章探讨了运用可编程技术设计数字锁相环和数字倍频器的相关问题，为以后电路设计拓展更多的方法。
The chapter 4 discuss some question of the circuit using programmable device like digital phase locked loop and digital frequency multiplier, it can increase the way of circuit design.
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