摘要
说明了利用傅立叶级数把连续周期时域信号转换成离散的频域信号的必要性。指出了傅立叶级数的2种表达形式,并对复指数形式的傅立叶级数的3个概念,即"虚数单位j"、"负频率"和"相位"进行了诠释。
It demonstrates the importance of converting continuous cycle time domain signal to discrete frequency domain signal with Frourier series. It points out two expression forms of Fourier series,in addition,it complains three concepts of Frourier series of plural exponential form,namely ＂imaginary unit j＂, ＂negative frequency＂and ＂phase＂.
出处
《科技信息》
2009年第25期I0134-I0134,I0132,共2页
Science & Technology Information
关键词
时一频转换
旋转因子“j”
负频率
相住
Time-frequency transformation
Rotating factor
Negative frequency
Phase
