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- Fourier frequency analysis 傅里叶频谱
- The time frequency analysis remedies the defect that short Fourier translation (SFT) has the same time resolution and frequency resolution to different frequency ranges. 该方法克服了SFT（短时Fourier变换）分析对高、低频段具有相同的时间分辨率和频率分辨率的缺点，弥补了小波变换只能粗糙地模拟基底膜带通滤波器特性的不足。
- A Depth from Defocus Auto-Focusing Method Based on Frequency Analysis[J]. 引用该论文 裴锡宇;冯华君;李奇;徐之海.
- The frequency measurement algorithm can accurately track the system frequency by adjusting the amendatory coefficient in real time according to the error of the original Fourier frequency measurement algorithm. 测频算法根据传统傅氏测频算法存在的误差，通过实时调整修正系数的方法，实现了高精度地跟踪系统频率。
- It is measured that the phase noise of mm-wave PLL source is-78dBc/ Hz (Fourier frequency is 1kHz offset carrier 37.4 GHz), spurious is lower than-60 dBc, output power is higher than 40mW. 实验表明;34.;7GHz频率点输出的相位噪声指标(傅氏频率为1kHz时)为-78dBc/Hz;杂散优于-60dBc;输出功率大于40mW。
- The conclusions are drawn that the BMA is useful to deal with the model uncertainty in frequency analysis. 贝叶斯模型综合能根据各线型的后验概率设置权重进行加权平均，以此减小线型选择的不确定性。
- It is measured that when Fourier frequency is 1kHz and offset carrier is 92. 7GHz, the phase noise of 3mm-wave PLL source is-75dBc/Hz. Spurious is lower than-55dBc and output power is higher than 10mW. 经测试，92.;6GHz时其相位噪声指标（傅氏频率为1KHz时）为－75dBc/Hz，杂散优于－55dBc，输出功率大于10mW。
- This paper proposes a new method based on time frequency analysis to detect spikes automatically. 本研究提出了一种基于时频分析的癫痫脑电棘波检测方法。
- A frequency analysis method is presented in this paper for measuring the flowrate of oilwater twophase liquid mixtures. 叙述了利用两相流体的混合不均匀性来测量流体流量的频率分析法。
- A method of frequency analysis is described for the simplification of a heat exchangerdynamic model. 通过频域分析，从理论上提出了一种建立管壳式换热器简化模型的方法。
- The main methods for calculating designed flood are probable maximum precipitation and hydrologic frequency analysis. 设计洪水计算方法主要是可能最大降雨和水文频率法。
- Main published work included length frequency analysis, virtual population analysis, production models, and maximum sustainable yield of Qatari fishery. 主要研究成果包括体长分析，世代分析方法，产量模型和卡塔尔国渔业的最大持续产量。
- METHODS:Frequency analysis was performed on 472 ADR cases collected from 54 medical institutions by means of Microsoft Excel. 方法:对54所医疗机构收集到的472例ADR报告利用Microsoft Excel电子表格进行频数分析。
- Fourier frequency measurement algorithm 傅立叶测频法
- This paper was focused on deriving the B nomogram of L-moments method,which was used to estimate the sampling errors in frequency analysis. 在设计洪水的抽样误差估计中,采用保证修正值系数B方法估计均方差简单易用。
- A new spatial frequency analysis method based on wavelet was applied to homomorphic filtering to enhance the contrast of ICT image. 针对ICT图像对比度低、边缘模糊、细节不清晰等问题,提出采用基于小波的同态滤波算法来对图像进行增强。
- Cunnane,C.Statistical Distributions for Flood Frequency Analysis[M].WMO Operational Hydrology Report No.33,Secretariot of WMO,1989. 参考文献[8]中;自1153年计算至1990年;N取整为840年.;本文延至2004年(下同);故N取整为850年由此引起的经验频率值略有改变;但不影响已有的适线成果
- It shows that since 1999 the seismic activity mainly belongs to the tectonic event based on a seismic spectral and time frequency analysis. 火山地震的频谱分析和时频分析结果表明，自1999年以来发生的火山地震主要为构造型火山地震。
- In cryptanalysis, frequency analysis is the study of the frequency of letters or groups of letters in a ciphertext. The method is used as an aid to breaking classical ciphers. 在数学,物理和信号处理中频率分析是一种分解函数,波形,或信号的频率组成以获取频谱的方法。
- The principles of erecting evaluation system were established.Indexes were filtrated by frequency analysis method, theoretical analysis method, and expert consultation method. 确定了评价指标体系建立原则，采用频率统计法、理论分析法和专家咨询法设置、筛选指标，使指标的配置更加合理；
