介绍了两种激光外差干涉信号的处理方法锁相频率解调法及组合频率解调法。
Two kinds of signal processing methods for heterodyne interferometer, phase locked frequency demodulation and combinatorial frequency demodulation are presented in this paper.
在正确了解调用链及其各自的频率之后，这些知识可能对调试和优化应用程序非常有用。
This knowledge can be useful for debugging and for optimizing an application through an understanding of the call chains and their respective frequencies.
提出了一种在未知信号频率条件下的FSK信号数字化解调方法。
A digital demodulation method of the FSK Signal is presented when its frequency parameters are unknown.
锁相环路是一种能实现相位自动锁定的控制系统，主要用于频率合成及跟踪解调系统。
The phase- locked loop is one kind of control system which is able to achieve phase automatic lock, to compose frequency and to trace demodulation system.
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.
因此，解调前必须去除频率偏差。
在载波频率已恢复的情况下给出了IQ正交分量的解调算法。
The demodulation algorithm for IQ components is given under condition that the carrier is recovered.
该解调方法具有结构简单、扫描频率高、分辨率好、线性度好等优点。
This method has some advantages such as simple structure, high scan frequency, high resolution and good linearity.
在接收端解调过程中，该频率同步误差会引入一定的相位误差，进而影响下一步的成像处理。
Phase errors is introduced in echo demodulation process because of the frequency synchronization error, and then, the final focus result will be deteriorated.
锁相技术在调制和解调、频率合成电路等很多领域应用极其广泛。
The phase-lock technique is widely used in many fields, such as modulation and demodulation circuit and frequency synthesizer circuit.
考虑到往复式压缩机振动具有振源丰富、信息干扰大的特点，利用包络解调法分离出系统固有频率成分的振动信号。
According to the character of vibration in reciprocating compressor, the vibration signal was separated from intrinsic frequencies of the system by envelope demodulation method.
理论分析证明，当频率间隔满足一定条件时注入ST-FSK解调器的干扰功率达到最小。
Theoretic analysis showed that the minimum jamming power could enter ST-FSK demodulator if frequency space were optimal.
它同时对激光频率和样品的塞曼效应进行调制，然后通过双解调来提取微弱的光谱信号。
In this spectroscopy, both laser frequency and Zeeman effect of a sample are modulated, and then the signal with high signal to noise will be obtained by double demodulation.
针对PGC解调中混频信号与实际调制信号的频率偏差，在DSP系统实现中采用一路A/D转换器对调制信号进行同步采样，从而克服了频率偏差对解调结果的影响。
To overcome the frequency offset between the mixing signal and modulating signal in PGC demodulation, an additional (A/D) channel in DSP system is used to sample the modulating signal.
因此，在改进的仿真模型中，采用科斯塔斯环来完成载波频率的同步，最终得到了正确的解扩和解调结果。
AS a solution COSTAS is used in the improved simulation model to complete the synthesis of the frequency of the carrier and in the end the correct demodulation and dispread spectrum results are made.
针对低莱斯因子信道中衰落和码间干扰的影响，提出了带内三重频率分集接收实现方式，给出了采用带内三重频率分集的调制器和解调器的原理框图。
For the influence of fading and ISI on low Rice factor channel, the system adopting diversity technology is presented, and the schematic diagram of the modem adopting diversity technology is given.
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.
在射频电路方面，提出了频率合成器和调制解调器设计方案，并通过测试证明了该方案的可行性。
In the aspect of RF circuits, the scheme of frequency synthesizer and modem is proposed, and the feasibility of the scheme is verified by practical test.
中频部分主要由HFA3724正交调制解调器和基于MB1502的锁相频率合成电路等组成。
The intermediate frequency circuit includes QPSK modulation based on HFA3724, PLL circuit based on MB1502.
许多已有的CO(中心局)dsl调制解调器可以只支持相对较窄的接收频率范围，这会增加估计宽的多的远端环路噪声的难度。
Many existing CO DSL modems may only support a relatively narrow receive frequency range, which will increase the difficulty of estimating the much wider bandwidth far-end loop noise.
不同目标的解调线谱频率是不同的。
不同目标的解调线谱频率是不同的。
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