Economic periodic fluctuation early warning signal system is built. On the basis of it, the early warning limits of all the indexes are determined.
建立了经济周期波动预警信号系统，在此基础上确定了各指标的预警界限。
In this paper, we present a "harmonic group clean algorithm" to obtain the estimation of the parameters of the periodic signal.
本文提出了一种“谐波组清除算法”来估计周期信号的参数。
We design the algorithm to detect periodic signal from white noise by the derivation.
根据推导结果设计了一种从白噪声中检测周期性信号的算法。
The characteristics of error motion of shafting is a complex signal which includes periodic component and random term.
轴系回转误差运动的特征是一项复合信号，它含有周期分量和随机分量。
A new approach to extract weak periodic signal from strong noise is proposed to pick up some weak signals in the fault diagnosis of mechanical equipment.
为提取机械设备故障诊断中的某些微弱信号，给出一种新的提取强背景噪声中微弱周期信号的方法。
It is difficult to detect the periodic impulse component in the vibration acceleration signal with conventional analysis methods such as time domain wave and frequency spectrum.
通过时域波形和频谱等基本分析手段来探测振动加速度信号中的周期性冲击分量往往是困难的。
Software synchronous sampling is widely employed in periodic signal measurement, but measurement errors occur very commonly.
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。
A portable periodic signal processor consists of 8098 chip microprocessors and DMF5002 lattice liquid crystal plane display.
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。
By adding temporal periodic signal with natural frequencies to discrete spatial points, the spatiotemporal chaos can be suppressed successfully.
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。
The simulated extraction of weak frequency variation signal is carried out with the expressed Resonant frequency locking property when system transits from chaotic to great periodic motion.
利用系统从混沌状态到大周期转变时所表现出的共振锁频性质，进行了微弱频率变化信号的仿真提取。
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.
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 decaying DC component in the sampling signal will bring errors to the full-wave Fourier algorithm, which is derived with periodic signal.
全波傅氏算法是基于周期信号推导出来的，当采样信号中含有衰减直流分量时，将会产生误差。
In the course of non-synchronization sampling, signal period measurement is an important step in digital measurement and analysis of periodic signal.
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。
This paper deals with the closed form recursive estimation for parameters of almost periodic moving average (APMA) signal using higher order cyclic statistics.
本文利用高阶循环统计量讨论几乎周期滑动平均(apma)信号参数的闭式递推估计。
In laboratory study, all kinds of noise including chaotic noise, are needed to be generated, which iterated with weak periodic signal is used to be signal source.
实验室内研究需要产生包括混沌噪声在内的各种噪声，并叠加微弱周期信号作为微弱信号检测系统的信号源。
It is investigated that the characteristics of stochastic resonance of the periodic pulse signal added Gaussian white noise through a threshold system.
研究含有高斯白噪声的周期脉冲信号，通过阈值系统后的随机共振特性。
In the meantime the correlation algorithm is combined with periodic spectral estimation, and a further improvement of the signal detection ability using this method is proved.
同时提出相关法与周期谱估计相结合的方法，并证明该方法可进一步改善信号的检测能力。
The stochastic resonance(SR)in an optical bistable system under the simultaneous action of multiplicative and additive noises and periodic signal is studied using the adiabatic approximation theory.
运用绝热近似理论，研究了由加性噪声和乘性噪声及周期信号驱动的光学双稳系统的随机共振现象。
By studying the vibration signal characteristics in periodic loading machine system, vibration signal model including state equation and observed equation was constructed.
通过研究周期性负载机械系统振动信号的特点，构造了包括状态方程和观测方程的振动信号模型。
Signal detection system based on chaos theory has the critical sensitivity to periodic signal and the immunity to the strong noise, which can be used in weak signal detection area.
基于混沌理论构建的信号检测系统具有敏感微弱周期信号和对噪声有强免疫力的特点，用于微弱信号检测领域优势明显。
The weak electric signal from stem and leaf of Rhododendrons is composed with periodic group waves.
杜鹃枝、叶微弱电信号波由具一定的周期性的组峰组成。
This paper introduces the designing way and the programming methods of the CAI software for periodic signal spectrum analysis and demo .
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 presents a design and realization for a DSP based on real time low SNR periodic signal extracting system for low SNR signals.
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。
EEG is a kind of complicated non-periodic bioelectricity signal and its research is still an important field for modern science.
脑电是极为复杂的非周期生物电信号，对脑电的研究始终是现代科学的一大热点。
By the method of looking up table, the sinusoidal signal can produce little periodic signal, which is difficult for the previous signal generators.
正弦信号采用查表的方法，解决了以往信号发生器无法产生小周期正弦信号的难题。
To evaluate the influences of the stochastic component on apparatus, it is necessary to remove the periodic components from the vibration signal.
为评估随机成分对设备的影响，需要将周期成分从振动信号中去除。
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.
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。
Using power cepstrum the weaker periodic signal can be recognized, and the side frequency of modulation signal can be recognized effectively.
倒频谱可以识别信号中较弱的周期成分，并对识别调制信号的边频县有特殊的效果。
This paper describes the need to transform the continuous periodic signal in time domain to the discrete signal in frequency domain by using Fourier Series (FS).
讨论了利用傅里叶级数把连续周期时域信号转换成离散的频域信号的必要性。
This paper describes the need to transform the continuous periodic signal in time domain to the discrete signal in frequency domain by using Fourier Series (FS).
讨论了利用傅里叶级数把连续周期时域信号转换成离散的频域信号的必要性。
应用推荐