结果表明，算法优于传统实小波包变换及点阈值算法，尤其对含周期噪声的语音信号，双树复小波包变换算法的优势更为明显。
The results show the proposed algorithm is better than common RWPT and node threshold method, especially for the speech contained periodic noise.
用平均平滑周期图法分别估算出信号与噪声的功率谱密度函数。
The power spectrum of the noise and signal are estimated by the average smooth periodogram method.
在考虑系统噪声和网络诱导延时大于一个采样周期的情况下，给出了多包传输的网络控制系统模型。
The model of NCS with multiple-packet transmission is presented considering system noise and network-induced delay longer than one sampling period.
本文给出了一种计算无噪声时具有正弦鉴相器的二阶锁相环捕捉特性的新方法，求得了每个差频周期的平均角频率牵引量。
A new method is presented for analyzing the acquisition behavior of second-order PLL with sinusoidal phase detector in the absence of noise.
实验结果表明：正常肺音音源为白噪声，异常肺音音源为周期脉冲序列，肺胸系统相当于声低通滤波器。
The results of experiment show that dreath sound sources are random white noise, Abnormal breath sounds sources are sequence of periodic impulses.
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.
临界混沌状态的周期振子对噪声具有免疫力，而对微弱的正弦信号或相位编码信号比较敏感。
The periodic oscillators at critical state are immune to noise and have sensitive dependence on weak sine signals or phase-coded signals at the same time.
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.
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。
It is investigated that the characteristics of stochastic resonance of the periodic pulse signal added Gaussian white noise through a threshold system.
最后，通过使用残差激励代替周期脉冲—随机噪声二元激励，让合成语音的质量得到了一定的提升。
Finally, by using residuals instead of periodic pulse excitation - random noise binary excitation, s the quality of synthesized speech has been some upgrading.
目前SAR经常用于内波的研究，但是SAR也存在着卫星重访周期长、数据费用高、图像噪声较大等的不足。
SAR imagery are usually available at the present research, however SAR are deficient for the long revisit period, high expense and strong noise.
其次，在考虑系统噪声和延时可以大于一个采样周期的情况下，提出了单包传输和多包传输的网络控制系统的模型。
Secondly, the model of NCS with single-packet and multiple-packet transmission under considering system noise and network-induced delay longer than one sampling are proposed.
用短时傅立叶分析的方法研究了辐射噪声在高频段时频变化的周期性，估计了目标的螺旋桨转速。
Period characteristics of radiated noise at high frequency is investigated by a method based on short time Fast Fourier Transformation, and propeller speed is estimated.
混沌信号具有遍历性、非周期、连续宽带频谱、似噪声的特性。
Chaotic signal has the properties of ergodicity, nonperiodicity, continuous broadband power spectra, and noise like etc.
为了在不同噪声、信噪比下为基音检测算法提供更能准确反映基音周期实际变化的输入语音，本文将信号分解思想引入基音检测前端处理中。
In order to provide an accurate-pitch-cycle speech for pith detection algorithm with varied noise and SNR, we use signal decomposition theory in pre-processing of pitch detection.
现场存在着各种各样的噪声，其中，白噪声和周期性窄带干扰是两类重要的干扰。
There have many kinds of noises in site, thereinto white noise and periodic narrowband noise are tow important noises.
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。
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.
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。
We design the algorithm to detect periodic signal from white noise by the derivation.
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。
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.
理论分析和仿真结果表明，新算法具有较强的鲁棒性，其抗噪声及抗协波失真性能明显高于现有周期算法，且计算简单，精度令人满意。
Simulation results and theoretical analysis show that the new period calculation method in this paper is robust? computationally simple and its accuracy of estimation is satisfactory.
时域平均法是从混有噪声的信号中提取周期性分量的最有效方法。
The time domain average method is an efficient method to extract period components from the signal mixed with noise.
通常检测的机械振动加速度信号，由于信噪比太低，即使存在周期性的冲击分量也往往被淹没在强的背景噪声之中。
However, in respect of a vibration acceleration signal, the signal to noise ratio (SNR) is often so small that the periodic impulse component is submersed in its intense background noises.
首先讨论了舰船辐射噪声的产生机理、构成和频率特性，指出螺旋桨噪声的振幅存在周期性调制。
First, the generation mechanism, components and frequency characteristic of radiated noise of naval ships are studied. There exists periodical modulation for the amplitude of propeller noise.
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。
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.
这表明相位噪声功率谱密度随外腔长度而周期性地漂移，且功率谱密度的峰值随外部反馈耦合率而发生很大的变化。
It is shown that the phase noise spectrum density shift periodicity with the length of external cavity and the peak value of power spectrum density varies considerably with the feedback coupling rate.
利用光学周期平均法能够清晰地描绘带有噪声的周期性图象。
Noisy images with a periodic structure can be cleared by utilizing optical periodic average method.
自适应预估器能用来提取宽带随机噪声背景中未知频率的周期性信号。
Self adaptive predictor is used to extract periodic signals with unknown frequencies from wide band random noise background.
对于时间周期小于半秒，陀螺仪的积分将会占优，水平加速度的噪声将会被滤去。
For time periods shorter than half a second, the gyroscope integration takes precedence and the noisy horizontal accelerations are filtered out.
如果在设计初期阶段对船舶舱室噪声进行预报，提出改进声学设计的措施，将对缩短造船周期，降低造船成本有着重要的作用。
If predicting Shipboard cabin noise in the early stages of ship design, proposed measures to improve the acoustic design, it is very important to shorten the shipbuilding cycle and reduce costs.
如果在设计初期阶段对船舶舱室噪声进行预报，提出改进声学设计的措施，将对缩短造船周期，降低造船成本有着重要的作用。
If predicting Shipboard cabin noise in the early stages of ship design, proposed measures to improve the acoustic design, it is very important to shorten the shipbuilding cycle and reduce costs.
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