Signal and it's Fourier transform can reflect the info of time domain and frequence domain independently.

信号及其傅里叶变换可以分别反映信号在时频两域内的信息。

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Feature extraction is the key of the content based watermarking algorithm. Feature can be extracted either in the space domain or in the frequence domain.

特征提取是基于内容的数字水印技术的关键，它可以在空域和变换域两个空间进行。

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A new approach is developed to the evaluation of linear quadratic optimal control problem (LQ) in frequence domain, and its practical procedure is pre - sented.

本文研究在频域中线性系统二次性能最优控制问题(LQ问题)的计算方法，并给出具体步骤。

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