正弦项 meaning in English

sine term

The thesis mainly deals with the third part of across : " sompi " cepstrum methods . the principle and system structure of across a re first introduced . the propagation of wave in media is simply studied and its transfer function in frequency domain is modeled as superimposed damped exponential sinusoids , each damped exponential sinusoid is called as a wave element and its exponential index part consists of two factors : group velocity travel time and decayed factor
为此，首先介绍了across的原理与组成和通过简单地讨论地震波在介质中的传播情况建立起介质的传递函数模型，指出：在一个狭窄的频率窗口里，介质的传递函数可以用有限个阻尼正弦项的叠加的形式表示，每个阻尼正弦项代表一个波成分，其指数部分包括两个因子：波成分在介质中的传播时间和衰减因子。