介绍了一种基于神经网络的滚动轴承故障包络信号的自动识别方法。
An automatic recognition method based on the BP neural network for the envelope signal of the rolling bearing is presented.
再通过对振动包络信号进行频谱分析就可以对轴承的故障类型作出判定。
Finally the failures are diagnosed by envelope spectrum analysis of the envelope signals.
利用希尔伯特变换求舰船噪声的包络谱，对舰船噪声的包络信号进行分析，并提取了四个特征量。
With Hilbert transform, the envelop spectrum of the signals radiated from ships was obtained. The ship radiated noise is analyzed and its 4 features are extracted from the envelop spectrum.
通过改进搜索策略、调整视频包络信号的门限值和设置相应的过渡状态等方法，提高了自动磁迹跟踪的速度和准确性。
The speed and accuracy are increased by improving the search strategy, adjusting the threshold of the video signal envelope and setting the corresponding transitive state.
该方法不仅能够对电压闪变信号进行不失真地包络检波，而且能够精确地检测电压闪变信号的时间和包络信号的频率分量及其幅度。
This method not only can achieve the distortionless envelope detection of voltage flicker, but also can detect the time, frequency and amplitude of the signal accurately.
常数模算法是一种最为常用的盲均衡算法，普遍应用于恒包络信号和非恒包络信号的均衡，但存在收敛速度慢和剩余误差大的缺点。
To solve the problem of slow convergence in the modified constant modulus algorithm (MCMA), a variable step and dual mode blind equalization algorithm is proposed, based on the MCMA algorithm.
早期电视机的视频检波均采用大信号包络检波电路，后来在集成化的电视机中，视频检波又都采用同步检波方式。
All circuits of demodulating strong signal envelope are adopted in previous TV's video demodulation, synchronizing demodulations are widely used in video demodulation in the later integrated TV set.
基于参数联合估计的多目标定位方法在不同目标数目、不同信号包络的定位实验中都有较好的表现。
The method based on joint parameter estimation shows preferable performance almost at all times, in cases of various number of targets and various type of signal envelope.
主动声纳信号检测性能的分析上，目前在计算机仿真中一般假定混响包络的统计特性符合瑞利分布模型。
Recently in the analysis of active sonar signal detecting performance, the statistical model of reverberation envelope is assumed to be in accord with Rayleigh-distribution in computer simulation.
传统的AM调幅信号解调方法是同步检波和包络检波法。
Traditional way of AM signal demodulation is envelope detector or synchronism detector.
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.
最后，推出了信号的复包络自相关函数。
And finally, the Auto Correlation of complex envelope signals are deduced.
首先利用希尔波特变换解调出信号包络，进而计算出解调谱；
By means of Hilbert transform, the author obtains the signal envelope, and then calculates the demodulation spectrum.
CPM信号包含大量的信号形式，它们的共同特点是信号包络恒定、相位连续，尤其适合于无线通信。
CPM consists of a large family of signals that are especially suitable for wireless communication, and the common characteristics of these signals are their constant amplitude and continuous phase.
这种差异可以用包络来描述，包络的不同可以体现不同被测信号的特点。
The difference can be described by envelope which can show the characteristics of signals.
本文主要研究了多载波相位编码(MCPC)脉冲信号，以及具有低峰值-平均包络功率比(PMEPR)的多载波脉冲串的设计。
This thesis mainly discusses the multi-carrier phase code (MCPC) pulses signal, and the design of pulses trains with low peak-mean envelop power ratio (PMEPR).
超声多普勒血流信号声谱图包络是声谱参数提取的基础，能为临床心血管疾病的诊断提供重要信息。
The spectrogram envelop of Doppler ultrasound blood flow signals from which spectrogram parameters can be estimated is important to clinical diagnosis of cardiovascular diseases.
正交采样技术可以保留信号复包络的幅度、相位等信息，因此在信号处理领域中有着广泛的应用。
Quadrature sampling technique is widely used in the field of signal processing since it can reserve all information about the complex envelope of IF signal.
在此基础上，结合包络检波等技术本文设计了实时信号检测和目标定位的仿真程序。
On this basis, with the combination of envelope detection and correlation peak interpolation techniques, a simulation program of real-time signal detection and targeting is designed.
连续相位调制由于其具有恒定包络幅度且对任意的调制信息序列能保持信号的相位连续，从而能够有效的改进信号的频谱特性。
The continuous phase modulation has the constant amplitude and its phase is continuous, which make the signal has a very good power spectrum.
在中低速散射通信中，调制解调器的位同步信号通常从含有同步信息的包络中提取。
In the troposcatter communication at low rate or medium rate, a bit synchronization used by modem is usually extracted from the envelope that contains synchronization information.
正交相干检波可以将复包络的所有信息进行保留，所以在数字信号处理中得到广泛应用。
Quadrature coherent detection can reserve all information of the complex envelope of signals, and it is therefore widely used in signal processing.
正交相干检波可以保留信号复包络的所有信息，因而在信号处理领域中有广泛的应用。
The quadrature coherent detector is widely used in the field of signal processing since it can reserve all information about the complex envelope of IF signal.
对机械故障中常见的调制信号，包络分析法是一种有效的分析方法。
Envelope analysis is an efficient approach to analyze the compound signal which is common in machinery fault signal.
正交相干检波保留了信号复包络的所有信息，因而在信号处理中得到了广泛应用。
The quadrature coherent detection is widely used in signal processing field, since it can reserve all information of the complex envelope of signal.
利用希尔伯特变换解调分析各频带信号，得到对应频带信号的包络谱；
The reconstruction signals were demodulated with Hilbert transform, and envelope spectrum at each band was obtained.
理论分析表明，CPQPSK信号具有恒定包络。
Theoretical analysis proves that CPQPSK signal has constant envelope.
提出了基于线调频基稀疏信号分解的包络阶次谱方法，并将其应用于变速齿轮箱故障诊断之中。
An envelope order spectrum based on multi-scale chirplet and sparse signal decomposition was proposed and applied to the fault diagnosis of gearboxes with rotating speed fluctuation.
研究了在信号包络存在细微差异前提下，基于信号抽取与最大似然准则的特定辐射源识别算法。
Aimed at the existing of minor differences of the signal envelopes, a specific radar emitter recognition algorithm is proposed based on the signal decimation and the maximum-likelihood criteria.
提出了利用波形长短时窗能量比值与波形信号能量包络的平方乘积检测横波初至的新方法。
A new technique for picking the first S-Wave arrival is presented by multiplying energy ratio of the long window to the short window by the square of the amplitude envelope of waveforms in the paper.
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