说明：  详细介绍matlab的FFT变换的实际物理意义，并通过具体事例具体分析，简单明了，方便易懂！绝对对你明白FFT变换的意义有很大好处和实用价值。
(Details of the FFT transform matlab actual physical meaning, and through a concrete analysis of concrete examples, simple and clear, easy to understand! Absolutely right you understand the meaning of FFT transform of great benefit and practical value.)