频谱分析

词组短语

spectral decomposition

与频谱分析相关的网络例句 [注：此内容来源于网络，仅供参考]

By using this method, the angular frequency, amplitude, initial phase angle, decay constant of each component in transient voltage and/or current waveforms can be precisely extracted. Also, all other kinds of transient procedure can be analyzed by this method. Thirdly, a new definition of generalized instantaneous reactive power and generalized instantaneous reactive current in dq0 coordinates under any nonsinusoidal and unbalanced three-phase circuit is proposed for the first time. The detection and compensation method for different instantaneous reactive currents are also concerned.

本文首先提出了用于快速高精度频谱分析的一种改进快速傅立叶变换方法，该法具有速度快、精度高、抗混迭、不受采样定理约束、可以分析出谐次大于N／2的频谱系数等特点，可方便地应用于电力系统谐波分析及其它各类频谱分析；然后提出了基于非线性最小二乘优化法的电力系统暂态波形分析方法，可准确求出电力系统暂态电压、电流波形中各个分量的角频率、幅值、初相角及衰减常数，并可广泛应用于各类暂态过程波形分析。

In order to make the analyzing results of virtual instrument more accurate, the spectrum correcting technology is studied. After analyzing three existing methods for phase difference correcting on discrete spectrum, it is recommended to correct the spectrum by the first phase difference correcting method.

为了使虚拟仪器频谱分析的结果更加准确，论文研究了目前应用广泛的频谱校正技术，并对三种相位差频谱校正技术进行了仿真实验和综合比较，提出了推荐采用的技术。

Based on the histogram multifractal spectrum estimation, a kernel density estimation of multifractal spectrum is suggested, and moreover a edge dection method by multifractal spectrum is present, simulation results show that image edges detecting through this method have good global and local character, and are more finner.

在多重分形频谱直方图估计方法的基础上，提出了一种基于核估计的多重分形频谱估计方法，同时提出了一种基于多重分形频谱分析的图象边缘检测方法，利用该方法所检测出的图象边缘具有良好的全局性和局部性，也就是说它能够检测出比较精细的图象边缘； 4。

Methods The semitive utterance studies were formant of vowels and voice onset time of consonant, which were analyzed by speech spectrum analysis system.

方法应用语音频谱分析系统分别对正常儿童、腭裂术前患者和腭裂术后患者的元音共振峰频率值和辅音嗓音起始时间的频谱特点进行分析。

This paper introduces the inverse spectrum and its features ,and presents with some applied experimental examples in the rolling bearing analysis by using this method.

转动轴承故障的倒频谱分析张文苑周湛学刘国众摘要：先容了倒频谱及其特点，列举了其在转动轴承分析中的应用实例。

Audio waveform statistical characteristics: base on high order spectral analysis methods, detect forgeries using bispectral analysis. Use matlab for experiments and perform analysis on the result.

音频波形统计特征方面：从高阶频谱分析理论出发，研究了高阶频谱分析的检测方法，并利用三阶频谱篡改检测使用matlab工具进行实验并分析实验结果，最后对整个方法进行分析以及思考。

Due to existing signal processing technology's shortage such aslow measurement, narrow measurement range precision and other poor performance, we introduced a high-precise signal processing technology:firstly,to get power spectrum with Hanning windowed Welch modified periodogram, search its peak value frequency;secondly, to apply zooming analysis via Goertzel algorithm;at last,to get a highly precise doppler frequency with energy centrobaric rectifying algorithm.

针对存在的缺点，本文提出了一种应用于激光多普勒测速的高精度信号处理技术，即首先利用加Hanning窗的Welch修正周期图算法得到信号功率谱，搜索其谱峰值频率，接着利用Goertzel频谱细化算法对搜索的谱峰进行细化分析，再引入能量重心频谱校正算法对细化后的谱峰进行校正分析，从而将离散频谱分析算法、频谱细化算法和频谱校正算法三者有机结合起来，充分发挥各自的优点：通过加Hanning窗的Welch修正周期图算法快速得到功率谱及峰值频率，通过Goertzel算法获得分析频带的高分辨率频谱，然后通过能量重心校正算法对细化后的频谱进行高精度校正，这样不仅保证了算法的高效性，而且大大提高了分析的精度。

Through simulation and computation, some critical values to contral interferences are obtained. These values have directive significance to the design and deployment of WRAN.(4) New methods to measure and analyze spectrum aredevelopedAccording to the shortages of previous spectrum measurements, new methods to measure spectrum occupancy in wide-band and multi-point synchronously is proposed in this dissertation, and the tests last a whole week; the relativities of licensed services are considered when test points are selected. More importantly, data mining and in-depth analysis are carried out with the huge amounts of test data, and a channel analysis method using Channel Vacancy Duration and Service Congestion Rate are proposed. The spectrum relativities of 3-dimension in time, space and frequency are researched also. The correlativity between channel state and history information is discoved, and which will provide the scientific basis to channel modeling, spectrum analysis and decision of CR users.

4提出了频谱测量与分析的新方法针对以前频谱测量工作存在的不足，本文提出了多点同时广域频谱测量方法，测量工作持续了一周的时间，同时考虑了测量地点的选取和频谱授权业务之间的相关性；对测量得到的海量数据进行了数据挖掘和深度分析，提出了使用信道空闲时间(Channel VacancyDuration，CVD)和业务拥塞率(Service Congestion Rate，SCR)进行信道分析的方法，研究了频谱之间的时间、空间、和频率三维立体的相关性，发现了信道状态和历史信息的关联性，为CR用户的信道建模、频谱分析和决策提供了科学的理论依据。

The results reveal that spectra obtained by different parametric methods are similar. The spectra of normal cells' voltage have only one noticeable lobe due to fluctuation of molten alumina at anodes, while spectra of other abnormal cells have one mainlobe and one sidelobe. In cells with carbon in bath the spectral mainlobe of cell voltage is still due to the fluctuation of molten alumina at anodes and the sidelobe is due to the fluctuation of carbon in bath; in cells with metal pad wave, the spectral mainlobe is due to metal pad waving and the sidelobe is still due to the fluctuation of molten alumina at anodes. Compared with wavelet packet analysis, spectral analysis is simpler and takes less time in calculation, which is a big merit in the large-scale application of online diagnosis systems of working conditions in aluminum reduction cells.

研究结果表明：不同的参数估计法得到趋于一致的频谱分析结果，正常槽只有1个尖锐谱峰，对应于阳极下熔融氧化铝涌动的特征峰，其他故障槽都有2个特征谱峰，即1个主峰和1个次峰，碳渣槽的主峰仍然对应着阳极下熔融氧化铝涌动特征峰，次峰对应悬浮碳渣的涌动特征峰；铝液波动槽主峰对应铝液波动特征峰，次峰对应着熔融氧化铝涌动的特征峰；频谱分析相对于小波包分析具有算法简单、耗时少、物理意义明确等特点，在槽况在线诊断系统的大规模推广中具有优势。

The Hilbert modulus is defined as the sum of the square of a signal and its conjugation.Hilbert modulus is used to covert the fundamental component in original phase current to direct current component,the fault characteristics frequency of bar break is transformed into the twice slip frequency.The problem is solved that fault characteristic component in the spectrum analysis of the current is easily to be blanketed by fundamental component and is hard to highlight fault characteristics.

将Hilbert模量定义为原始信号与其共轭信号的平方和，利用Hilbert模量将原相电流中的基波分量转变为直流分量，原频谱分析的转绕组断条的故障特征分量转变为频率为二倍转差频率的电流分量，决了相电流频谱分析方法中断条故障特征成分容易被基波湮没而难以突出故障特征的问题。

与频谱分析相关的网络解释 [注：此内容来源于网络，仅供参考]

fourier analysis：傅里叶分析(频谱分析)

Transient Analysis... 瞬态分析... | Fourier Analysis... 傅里叶分析(频谱分析)... | Noise Analysis... 噪声分析...

radio spectrum analyzer：射电频谱仪

细胞功能分析:Cell Function Analyzer | 射电频谱仪:radio spectrum analyzer | 分光晶体:X-ray analyzer crystal

spectral analysis：频谱分析

2.4.1 生理影响 Kimura等[21]用心率和血压变异性(HRV和BPV)频谱分析(spectral analysis)的方法,研究尼卡地平控制性低血压的血管神经反应. 将HRV和BPV取对数后积分,总频率范围为0.01~0.4Hz,低频(LF)区0.06~0.1Hz,代表交感和副交感活动,

Signal Spectral Analysis：频谱分析

解析信号:analysis signal | 频谱分析:Signal Spectral Analysis | 图象分析:Signal analysis

spectral decomposition：频谱分析

spectral colours 谱色 | spectral decomposition 频谱分析 | spectral density function 谱密度函数

SD Spectral Distribution：光谱分布,频谱分析

SCUF slow continuous ultrafiltration 缓慢连续性超滤 | SD spectral distribution 光谱分布,频谱分析 | SDS sodium dodecyl sulfate 十二烷基硫酸钠

spectrum analysis：频谱分析

1980年在新竹交通大学,我们开始用频谱分析(spectrum analysis)来研究脉波. 我们与台北三军总院合作,由该院的病人取得脉波,存於磁带,然后在交大以电脑作频谱分析. 图二显示正常人(无病)的频谱. 这图包括由左腕寸、关按轻按重(用精密而微小麦克风录取脉搏波动,

frequency spectrum analysis：频谱分析

frequency spectrum analyser 频谱分析仪 | frequency spectrum analysis 频谱分析 | frequency spectrum 频谱

Spectrum：频谱

"频谱"(Spectrum)是指声音中所含泛音的数量以及 各个泛音在强度上的相对关系. 声音的频谱可以用专门的分析仪器显示出

sonic frequency spectrum recording meter：声频频谱记录仪

sonic frequency cymometer 声频频率计 | sonic frequency spectrum recording meter 声频频谱记录仪 | sonic gas analyzer 声学气体分析计