通过将生物体与外部的周期信号完全隔离，生物学家了解到生物体有内部的生物钟。
By isolating organisms completely from external periodic cues, biologists learned that organisms have internal clocks.
相位是周期信号的一种重要的波形参数。
Phase is a kind of important wave parameter of periodical signal.
本文提出了一种周期信号等效非均匀采样策略。
A strategy for the equivalent nonuniform time sampling of periodic signals is proposed.
这一方法为周期信号频谱的准确测量提供了可能。
This makes it possible to measure period signal spectrum exactly.
本文提出了一种“谐波组清除算法”来估计周期信号的参数。
In this paper, we present a "harmonic group clean algorithm" to obtain the estimation of the parameters of the periodic signal.
数字查表法合成周期信号是一种最常用的直接数字频率合成技术。
Digital look up table method for synthesizing periodic signals is the most popular technique for direct digital frequency synthesis.
分析了这三种改进算法的误差和性能，供交流周期信号测量选择。
The error caused by each algorithm was analysed, and some Suggestions for ac periodic signals measurement were provided.
实践证明了，倒频谱在检测周期信号和识别边频上具有独特的功能。
The special functions of cepstrum in testing cycle signal and side-band identification were fully proved by application.
针对周期信号实际的非同步采样，提出一种频谱插值校正的分析法。
A new spectral interpolated compensation analysis method of periodic signals to compensate the spectral leakage caused by non-coherent sampling process is presented.
在实验室进行周期信号分析时，通常使用选频电平表来测量其频谱。
When periodic signals are analyzed in the laboratory, we measure the frequency spectrum of signals usually by a selection level meter.
介绍了“周期信号频谱分析演示CAI软件”的设计思路和编程方法。
This paper introduces the designing way and the programming methods of the CAI software for periodic signal spectrum analysis and demo .
周期信号测量中广泛采用软件同步采样测量方法，其测量误差普遍存在。
Software synchronous sampling is widely employed in periodic signal measurement, but measurement errors occur very commonly.
该方法可应用到设备内部自测试中，并可完成周期信号的在线故障检测。
This method can be applied to the built in self test of equipment and accomplish on line fault detection of period signals.
应用小波分析研究了外循环反应器浓度波这类非平稳拟周期信号的特征。
The characteristic of the concentration wave in the RTD of out-circular reactor, which is a nonstationary quasi-periodic signal, has been investigated with wavelet analysis.
它能精确测量任意波形的低频模拟周期信号并同时显示其有效值和分贝值。
It not only can measure the discretionary low frequency analog signals exactly, but also can simultaneously show their virtual values and decibels.
应用四要素法对周期信号和非周期信号激励的一阶电路作了较详细的分析；
The traditional three factors method ford-c first-order linear circuit is only one special example of the new method being discussed.
本文介绍了一种基于DSP的低信噪比周期信号实时提取系统的设计和实现。
This paper presents a design and realization for a DSP based on real time low SNR periodic signal extracting system for low SNR signals.
给出了LFMCW雷达信号的多周期模糊函数，并与单周期信号进行了比较。
The multi-period ambiguity function of LFMCW radar signal is given, and compared with single-period ambiguity function.
反映滚动轴承故障的特征周期信号处于较低频带内，容易被噪声淹没，难以检测。
The fault characteristic periodic signals of the rolling bearing are in low frequency band and often buried in the noise.
在非同步采样过程中，信号周期的测量是周期信号数字化测量和分析的重要环节。
In the course of non-synchronization sampling, signal period measurement is an important step in digital measurement and analysis of periodic signal.
讨论了周期信号取样的时域频域特性、非同步取样引起的截断误差和频谱泄漏误差。
The time-frequency domain sampling characteristics of periodic signal, the truncation error and the spectrum leakage error caused by asynchronous sampling are discussed in detail.
斑秃发病机制的研究，重点是早期病程中炎症和毛囊周期信号传导通路的改变机制。
Research on pathogenesis of alopecia areata, with a focus on inflammation in the early stage of the disease and dynamics of signal transduction pathway of hair cycle.
这说明胎儿心率信号不是噪声，不是周期信号，可能是服从一定动力学规律的信号。
This shows that the heart beat signal of fetal is not signal of noise, not periodic signal, but the signal, which may follow some dynamical laws.
被高速伪随机码调制的扩频信号，其伪随机码是具有随机编码信号特征的周期信号。
The spread spectrum (SS) signal is modulated by high-rate pseudo noise code, and belongs to typically periodic signal.
从软、硬件角度设计了适用于分布式系统的发动机电子控制器，如周期信号发生器；
In the paper, engine electronic controller(EEC) which is fit for distributed system is designed from the way of hardware and software, such as regular pulse generator.
研究表明，通过在空间分立点加上自然频率的时间周期信号，可以控制时空混沌运动。
By adding temporal periodic signal with natural frequencies to discrete spatial points, the spatiotemporal chaos can be suppressed successfully.
通过分析模糊函数表达式，得到了单、多周期信号的理论多普勒分辨率与时延分辨率。
By analyzing ambiguity function expressions, this paper resolves theoretic Doppler signal resolutions and delay resolutions of single-period and multi-period symmetrical triangle LFMCW signals.
便携式周期信号分析仪由8098单片机和DMF5002点阵式液晶平面显示器组成。
A portable periodic signal processor consists of 8098 chip microprocessors and DMF5002 lattice liquid crystal plane display.
而时域同步平均可以有效衰减与回转频率无关的干扰，提取与工作状态直接相关的周期信号。
Time domain synchronous averaging can reduce the signal not coherent to rotation frequency effectively, and extract the repetitive signals directly related to machine operation condition.
而时域同步平均可以有效衰减与回转频率无关的干扰，提取与工作状态直接相关的周期信号。
Time domain synchronous averaging can reduce the signal not coherent to rotation frequency effectively, and extract the repetitive signals directly related to machine operation condition.
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