Step four: the main frequency spectrum of the acoustic analysis.
步骤四：进行该声波主要频谱的分析。
This article proposes one practice case for a satellite frequency spectrum monitor system.
提出了一种卫星频谱监测系统的实践案例。
The concept of time - frequency power spectrum is introduced.
引出了时—频功率谱的概念。
The concept of time - frequency power spectrum is introduced.
引出了时—频功率谱的概念。
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