The Fourier amplitudespectrum used in a seismological model can be expressed as a product of source spectrum, propagation path factor and site effect in frequency domain.
在频域内，场地的地震动傅立叶幅值谱，可以表示为震源谱、传播路径影响因子和场地效应的乘积。
2
The spectrum division technique was used for establishing signal model of delay time measurement, and amplitudefrequency characteristics of the signal after spectrum division was investigated.
利用频谱相除技术构建了延迟时间测量的信号模型，研究了频谱相除后信号的幅频特性。
3
Spectrum of the amplitude-modulated wave is observed by a radio frequencyspectrum analyzer and amplitude values of every spectrum are recorded at the upper sideband or lower sideband.