查询词典 frequency analysis

So the ultra-low frequency absolute vibration detection is a difficult problem in engineering measurement field. In this paper, the ""high-frequency-suppression and low-frequency-lifting"" compensation method was presented based on the analysis of the inertial sensor with "" mkc "" structure.

本文通过对mkc结构惯性式传感器机理的分析，提出了一种对传感器传递函数进行"抑高扬低"的补偿方法，并对此补偿网络和系统幅频特性进行了优化，较好地克服了惯性式传感器低频特性差的固有缺陷，实现了传感器的微型化。

Matlab Toolbox time-frequency analysis, with short-time Fourier transform, Cohen category bilinear time-frequency processing function, Affine category bilinear time-frequency processing function, Fuzzy function and the other handling functions such as source, it should be very useful.

Matlab 时频分析工具箱，含短时傅立叶变换、Cohen类双线性时频处理函数、Affine类双线性时频处理函数、模糊函数和其他处理函数等源码，应该很有用。

Fast Fourier transformation and autoregressive model estimation, are the most common methods used in the frequency domain analysis. The fluctuation in the highfrequency bands are mediated by parasympathetic control, whereas the fluctuation in the low frequency bands are mediated by both sympathetic and parasympathetic nervous systems. The origin of the fluctuation in the very low and ultra low frequency ranges are less obvious.

频域分析法一般是利用快速傅位叶转换或自动回规模型估计法，高频处的变异是由副交感神经系统调控，低频处的变异则是由副交感神经系统共同调控，至於极低频处与超低频处的变异，其原因尚待厘清。

Aiming at the project request, the paper firstly introduces the theory of Frequency Hopping Communication, the theory of sampling and the principle of spectrum analysis using discrete Fourier transform, then combined with the characteristic and superiority of FPGA designs a channelizing detection method for the carrier frequency in Ultrashort Frequency Hopping signal based on FPGA.

然后结合现代可编程器件FPGA的特点与优势，设计了一种基于FPGA技术的信道化电子侦察方案。

The results of the study are as follows: 1 Wigner′s time-frequency analysis of the geoacoustic signal is of a clear physical meaning, which can be described as the energy distribution in time and frequency domain, and can reveal the frequency spectrum essential features of non-stationary geoacoustic signal.

研究表明：1。地声信号的Wigner时-频分析具有明确的物理意义，它可表述为信号在时间和频率域上的能量分布，揭示了非稳态地声信号频谱的本质特征。

On the basis of analysis and comparison of conventional and some modern dielectric loss measurement methods in this paper, considering the difficulty consist in the dielectric loss measurement, such as the problem of the locale measurement of dielectric loss the suffering the interference of the electric field in the electrified wire net, the influence of harmonics and the leakiness of frequency spectrum due to the change of the frequency in power supply etc. a new measurement method which the frequency conversion anti-jamming technology combines the fundamental waves phase detachment method is presented.

论文在分析了传统介质损耗测量方法和现代介质损耗测量方法的基础上，针对介质损耗检测中存在的技术问题，如现场测量时工频电网强电场干扰问题、高次谐波影响问题、供电电源频率改变所引起的频谱泄漏和栅栏效应等问题，提出了采用变频抗干扰技术和基波相位分离法相结合的新型测量方法。

In the past, the high frequency resonance technique is usually applied in the envelope detection for a vibration signal with amplitude modulation. When applying the Hilbert transform in the high frequency resonance technique for the envelope detection of vibration signals, the computing burden is very high. On the other hand, when applying the linear least squares analysis method, the computing burden is lower. When applying the envelope detection in the lowest vibration mode, an accelerometer with the low-pass filtering cutoff frequency at 4kHz should be choose.

在过去的研究方法中，振动讯号之振幅调变通常以高频解调分析法应用於包络讯号侦测，而高频解调方法应用希尔伯特转换的包络分析，所需要的计算量是非常的高，若以线性最小平方分析法应用於高频解调分析法中，则所需要的计算量较小，如果以最低模态来估测包络讯号时，可以适当的选取加速规来代替低通滤波器，而加速规的截止频带必须在4kHz左右。

It can eliminate the effect of rotor speed and sampling frequency on the distribution of wavelet analysis frequency band energy. Energy features of the frequency band gave unified physical meanings.

该方法能消除转子转速和采样频率对小波分解频带分布的影响，提取的频带能量特征具有统一的物理意义。

The frequency analysis conducted in this study further indicates that while high token frequency results in lexicalization of V-kai complex verbs, high type frequency leads to schematization of V-kai constructions.

本研究所执行的频率分析进一步指出例的频率会导致「V-开」复杂动词的词汇化，而型的频率则会引起「V-开」构式的基模化。

Because of the great effect of the stray capacitance and stray inductance under the high frequency, both the analysis methods and design applications of the high frequency show different from the one of low frequency circuit.

在高频条件下，杂散电容和杂散电感对电路的影响非常大，所以射频电路无论是分析方法还是设计应用都与低频电路存在很大的不同。

Molecular Distillation is a kind of high vacuum distillation method, which is suitable for the separation of high boiling, heat sensitivity and viscidity products.

分子蒸馏技术是一种在高真空条件下进行的连续蒸馏过程，适合于分离高沸点、热敏性及具有生物活性的混合物。

They are to the Noughties what yuppies were to the Eighties .

那在六十年代是时髦的，但在八十年代肯定是过时了