最常见的数字信号处理技术之一是离散傅立叶变换（DFT），它把一个信号分解成它的组成频率，并表示成一个矩阵。
One of the most common digital-signal-processing techniques is the discrete Fourier transform (DFT), which breaks a signal into its component frequencies and can be represented as a matrix.
当他们把测量结果通过傅立叶变换分解成一组波时，这组波随着频率减小而增幅巨大。
When they turned these measurements into a series of waves using a mathematical trick called a Fourier transform, the waves increased in magnitude as their frequency decreased.
该文从原理上分析了相乘器在频率变换中的应用及过程。
This article analyses the applications and procedures in frequency transformation of multiplier from principle.
该文系统地讨论二极管工作在开关特性下所组成电路的频率变换的工作原理。
This paper tries to discuss the work principle of frequency transformation on the circuit where diodes work on on-off speciality.
或许我们可以寻找序列的Fourier变换中的高频率成分。
Maybe we could look for high frequency components in Fourier transforms on the sequences.
本文采用基于傅立叶变换(DFT)的频谱分析方法，计算流量信号的频率和相位差。
This paper presents calculation of frequency and phase difference of flow signals with spectrum analysis on basics of Fourier transform (DFT).
频率域滤波方法虽然可解决时变滤波问题，但这种方法是基于傅里叶变换，在窗口与窗口之间的接合部位会出现假异常。
Although the filtering method in frequency domain can solve the time variant filtering problem based on Fourier transform, the method may appear a false anomaly in conjunct part between Windows.
相乘器是由非线性元件组成，可以实现两个信号的相乘，完成频率变换的电路。
Multiplier is the circuit which is conformed of nonlinear elements and can make two signal multiplied so that it can implement frequency transformation.
小波变换作为频率和时间的二元函数，使之可以很方便地在频率和时间域中同时进行地震波能量的吸收衰减补偿。
Wavelet transform involves the two-variate function of frequency and time, which makes it convenient to simultaneously compensate for attenuation of seismic energy in frequency and time domains.
时频分析方法是利用小波变换原理，从地震波的时间域和频率域同时对其作出分析。
Time frequency analysis method is used to analyze the time domain and frequency domain of seismic waves at the same time according to the principle of wavelet transformation.
快速傅立叶变换用到的窗宽度长度有限，因此不能获得完美的频率分辨率。
In STFT is window is of finite length, and we no longer have perfect frequency resolution.
传统的快速傅里叶变换（FFT）可以有效地对正弦信号进行分析，但对于分析频率相近的正弦信号却存在很大的误差。
Traditional FFT can effectively analyze the sinusoidal signal, but the very big error exists for analyzing the similar frequency sinusoidal signal.
你变换岗位的频率有多高，包括在同一家公司和不同的公司？
How often have you switched positions, either within the same company or at different employers?
从理论上计算各个参数的设置范围，并且证明小波变换方法比FFT方法有较高的频率分辨率。
Calculates the setting range of each parameter in theory, and proves the method of wavelet transformation has higher frequency resolution than the method of FFT.
因此，采用AD器件和数字滤波器技术实现混频等频率变换功能，是一种比较先进和新颖并且实际可行的方法。
Therefore, taking advantage of AD device and digital filtering technique to realize mixing and other frequency transformation function is a comparatively advanced, novel and practical method.
在总结激光频率变换的原理和非线性光学晶体的相位匹配理论的基础上，可以根据相位匹配理论进行晶体的相位匹配角的计算。
The principles of laser frequency transformation and the theory of phase matching in nonlinear optic crystals are also discussed. Based on this theory, Angle of phase match is calculated.
本文在对相位噪声的概念、产生及其相关测量方法研究的基础上，设计出一种低噪声频率变换电路。
This paper presents a new type of low noise frequency conversion circuit based on the research of phase noise conception, generation as well as relativity measurement method.
本文利用数字梯形滤波器的设计原理，以离散微分器作为积木块，利用频率变换方法，设计出数字LDD梯形高通滤波器。
Based on the design fundamental of digital LDI ladder filter, a digital LDD ladder high-pass filter is designed by using the frequency transformation in this paper.
双线性时间-频率变换在时间域与频率域都具有较高的分辨率，有利于复杂背景条件下微弱瞬时信号的探测。
Bilinear time-frequency transform possesses a high resolution both in the time domain and the frequency domain. It can be utilized to detect weak transient signal in complex background.
介绍了利用快速富里叶变换(FFT)计算离散数学模型频率特性的方法。
A method of using fast Fourier transformation (FFT) to calculate the frequency characteristics of discrete mathematical model is introduced.
为了改善低信噪比下波束形成的性能，从双稳态随机共振模型出发，提出了利用频率尺度变换，将随机共振和波束形成结合起来的算法。
To improve beamforming under low signal-to-noise ratio, a method based on stochastic resonance(SR)in a bistable model is investigated by using a frequency scale transformation method.
该方法基于多维空间变换，构造频率转移函数简单方便，而且便于跳频密钥的管理和控制。
The technique is based on multi- dimension space transform, the realizing of this technique is convenience, and it is easy to control the secret key of frequency hopping.
以前的可调谐紫外激光器是基于可见光区域的可调谐激光，经过非线性频率变换得到。 结构复杂、可靠性差。
The majority of known tunable UV sources were complicated devicescomprising some tunable laser in visible region and subsequent nonlinear frequency conversion.
研究了双线性变换中的频率失真。
The frequency infidelity of Bi Linear Transform is investigated in this paper.
本文介绍计算双轴晶体二阶有效非线性系数的严格理论，适用于双轴晶体非线性光学频率变换器件的设计。
We present an accurate route, which is suitable for the design of nonlinear optical frequency translator of biaxial crystals, to calculate the effective second-order nonlinear coefficients.
通过对方向矩阵进行极分解构造聚焦矩阵，把各个窄带频率处的信号子空间变换到聚焦频率处的信号子空间。
Focus matrix is constructed by polar decomposition of location matrix and transforms signal subspace at different frequency bins to signal subspace at focusing frequency bin.
本文介绍一种基于频率变换的时间放大技术，可用于正弦周期信号的相位精确测量或延迟时间测量。
This article introduces a technology of time amplifier based on frequency converter. It can be used for phase detection of sine period signal or determination of time delay.
通过聚焦操作，把各个窄带频率处的阵列输出矢量变换到聚焦频率处，然后求其累积量矩阵。
By focusing operation, array output vectors at different frequency bins are transformed to focusing frequency and individual cumulants matrix is got.
方法ecg信号经过小波变换后，其不同频率成份会映射到变换结果的不同尺度上，而在这些尺度之间存在相互的联系。
Method After wavelet transformation, the components of different frequencies in an ECG signal could be mapped to a set of specific scales, and there were some connections among them.
拓宽激光输出波长的范围最常用最有效的方法之一是利用非线性晶体在相位匹配条件下的频率变换技术。
One of the most effective and feasible ways of broadening the range of the output wavelength is using frequency conversion of non-linear Crystal under the condition of phase matching.
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