The spectrum of amplitude modulated signal are two half magnitude spectrums of base band signal positive and negative shifted by a carrier or R. F. frequency.
调幅讯号之频谱为一半强度基频讯号之频谱分别正负位移一射频或载波之频率。
2
Firstly, in order to reduced the computational complexity, the magnitudespectrum of CW is divided into basic matrix, transitional matrix and supplemental matrix.
首先，为了降低计算复杂度，将CW的幅度谱分块处理，分成基本矩阵、过渡矩阵和补充矩阵。
3
Both seismological theory and macroseismic observation show that the shape of strong motion response spectrum depends mainly on magnitude, distance of epicenter and engineering site condition.