1) volt-frequency transformation
伏频变换
2) frequency conversion
频率变换
1.
The lithium thioindate(LiInS_2) crystal is an attractive material,which can be widely used for nonlinear optical frequency conversion in the infrared region.
LiInS2晶体是一种极具吸引力的晶体,可以应用于红外区域的非线性光学频率变换。
2.
The theoretical calculation of frequency conversion in a new bismuth triborate (BiB3O6) crystal with high nonlinear optical (NLO) coefficient is present.
理论计算了新型高非线性光学系数三硼酸铋晶体(BiB3O6)中的频率变换。
3.
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。
3) frequency transformation
频率变换
1.
Design of impedance transforming-network by frequency transformation;
频率变换法设计阻抗变换器
2.
The Research and Realization of AD Frequency Transformation Based on DSP;
基于DSP的AD频率变换的研究与实现
3.
Diode is one of the nonlinear elements which are usually used in electronic circuit,whose speciality of frequency transformation is widely used in communication system.
二极管是电子电路中常用的非线性元件,其频率变换特性在通信系统中得到广泛的应用。
4) phase-frequency conversion
相频变换
1.
The digital test technique is used to test the phase sequence and the phase-frequency conversion technique is used to test the line-break breakdown.
介绍了一种新颖的相序检测及电机缺相保护方法,利用单片机实现数字相序检测,并且用相频变换的方法来实现电源缺相检测。
5) voltage to frequency conversion
压频变换
6) time-frequency transform
时频变换
1.
A channel estimation model of time-frequency transform OFDM system;
一种时频变换OFDM系统的信道估计模型
2.
In this paper, the development and trend of those detecting algorithm on time-frequency transform are reviewed from single scale detecting ways, such as filters to multi-scales detecting ways based on wavelet analysis and a new multi-scales method experimental mode decomposition(EMD).
简要回顾了以滤波器为代表的单一尺度时频变换方法、以小波分析为代表的多尺度时频变换方法,以及另一种较新的多尺度时频变换分析方法—经验模式分解(EMD)等在QRS波群检测中的应用情况和发展前景。
3.
Therefore we present a non-uniform time-frequency transform (NUTFT) to replace the ordinary time-frequency transform used in short block.
设计了一种非均匀时频变换方法,它在保留了对信号低频平稳分量的频率分辨率的同时提高了对高频暂态分量的时间分辨率。
补充资料：Radon变换和逆Radon变换
Radon变换和逆Radon变换
X线物理学术语。CT重建图像成像的主要理论依据之一。1917年澳大利亚数学家Radon首先论证了通过物体某一平面的投影重建物体该平面两维空间分布的公式。他的公式要求获得沿该平面所有可能的直线的全部投影(无限集合)。所获得的投影集称为Radon变换。由Radon变换进行重建图像的操作则称为逆Radon变换。Radon变换和逆Radon变换对CT成像的意义在于，它从数学原理上证实了通过物体某一断层层面“沿直线衰减分布的投影”重建该层面单位体积，即体素的线性衰减系数两维空间分布的可能性。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条