Fast Fourier Transform (FFT) is an effective method to detect harmonic.

快速付立叶变换(FFT)是对谐波进行检测的有效方法。

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Period characteristics of radiated noise at high frequency is investigated by a method based on short time Fast Fourier Transformation, and propeller speed is estimated.

用短时傅立叶分析的方法研究了辐射噪声在高频段时频变化的周期性，估计了目标的螺旋桨转速。

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The method is compared to the traditional FFT(Fast Fourier Transformation)analysis. The feasibility of analyzing the engineering measure data using wavelet transformation is discussed in this paper.

并将该方法与传统快速傅立叶变换分析结果进行比较，探讨了使用小波变换对工程实测数据进行分析的可行性。

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