频谱 frequency spectrum; frequency content; spectrum; power-density spectrum; power spectrum; [系统] spectral density◇频谱测定法 spectrometry; 频谱分析 spectrum analysis; frequency analysis; 频谱仪 frequency spectrograph
Information of system auto and cross spectrum , auto and cross correlation . coherent function , signal to noise ratio , frequency response and impulse response was established to help the study and arrangement of the module components 由力规及加速规两量测之时域讯号,经快速富利叶转换,计算其自频谱及互频谱,再经反富氏转换回时域之自相关及互相关函数、相通函数、讯噪比、频率响应函数、脉冲响应函数。