在典型的通信系统中，调制过程是数字信号加载在载波的幅度值、载波的频率或者载波的相位上。
In the model communications system, the modulation process also is loaded the digital signal in the carrier scope value, the carrier frequency or on the carrier phase.
设计了以C8051F 060混合信号微控制器为核心的全数字信号检测系统，实现其采样信号和调制信号的相位关系保持。
An all digital signal detecting system using C8051F060 as its core was completed. It can maintain the phase relation of sampling signal and modulating signal.
针对火炮指挥系统供电电源高可靠性要求，设计了一种采用相位调制跟踪法的全数字式电源并联系统。
A parallel operation control method based on a modulated phase tracking method was designed for high reliability requirement of uninterrupted power supply used in gun command system.
本章首先分析了各种数字载波调制方法，从调制信号信噪比的角度分析说明基于相位调制的方法适合作为双绞线载波调制的方法。
From signal to noise ratio analysis of the modulation signal, we choose the phase modulation method as the suitable carrier modulation for the twisted-pair.
电光相位调制器是数字闭环光纤陀螺系统中的关键部件，主要用于产生偏置相移，使整个闭环系统始终工作在零点附近。
Electrooptic phase modulator is critical part in digital closed-loop FOG system, the function of which is to create bias phase, so that to make FOG working around zero point.
结果表明，数字调制具有分辨率高、全数字化可编程、相位噪声低等特点。
The results show that digital modulation is with high resolution, total digitalization programmable, and low phase noise etc.
借助所选择的离散的载波相位变化来传输数字信息的调制技术。
Modulation techniques for transmitting digital information in which that information conveyed by selecting discrete phase changes of the carrier.
针对传统数字调制信号频谱扩展问题，提出具有相位突变特性的时相调制(TPM)方式。
Aiming at the spectrum spread problem of traditional digital modulation signals, a time-phase modulation (TPM) method with abrupt phase change characteristic is proposed.
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.
为了补偿数字电视发射机的频谱畸变与相位失真，以得到最佳的VSB频谱特性，可以在调制器中加入预均衡网络对频谱进行预畸变。
To minimize the frequency and phase distortion in a DTV transmitter in order to achieve best VSB frequency performance, a pre equalizer can be inserted into the modulator.
尤其对用数字方法恢复单一载波调制格式中的光相位和偏振的接收机端的先进算法进行了详细的讨论和分析。
The principle of several digital phase and polarization tracking algorithms recently proposed and demonstrated for future spectrally-efficient optical transmission system are discussed in detail.
该方法用短时分析提取数字调制信号在幅度、频率和相位随时间变化的特征，并利用这些特征对各种数字调制信号进行识别。
The approach is to use short-time analysis to extract the characteristics of time-varying amplitude, frequency and phase in a digital modulation signal, and applies them for simple identification.
四相相移调制是利用载波的四种不同相位差来表征输入的数字信息，是四进制移相键控。
Quadrature phase shift carrier modulation is used to represent the four different phase inputs of digital information, is quaternary phase shift keying.
调制部分实现CPFSK调制，对传统的DDS技术进行改进，使其数字部分的杂散性能改善且具有较低的相位连续误差。
For the modulation part of the design, traditional DDS technology is improved to implement CPFSK modulation. As a result, the performance of spur and error of digital part are optimized.
调制部分实现CPFSK调制，对传统的DDS技术进行改进，使其数字部分的杂散性能改善且具有较低的相位连续误差。
For the modulation part of the design, traditional DDS technology is improved to implement CPFSK modulation. As a result, the performance of spur and error of digital part are optimized.
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