First, this paper proposes a novel frequency demodulation algorithm, where signals are first processed by autocorrelation analysis to eliminate random noise, and then implemented envelope demodulation to extract original modulation frequencies.
首先针对齿轮裂纹等局部故障的早期诊断,提出了一种时延自相关解调频方法。 该方法先对信号进行自相关预处理,然后再对信号的时延自相关函数进行包络解调,可以得原信号的调制频率。
参考来源 - 机械故障诊断中的微弱信号提取方法的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Combining to devise radio telemetry receiver, the application of digital down converter and frequency demodulation in software radio is discussed and analysed.
结合无线电遥测接收机的设计，论述和分析了软件无线电技术中的数字下变频和调频数字解调技术在遥测接收机中的应用。
Two kinds of signal processing methods for heterodyne interferometer, phase locked frequency demodulation and combinatorial frequency demodulation are presented in this paper.
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。
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.
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。
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