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的傅立叶变换,工程技术中，常将看成一时间信号，相应的空间，称为时间域和空域；将其傅立叶变换看成频率函数，相应的空间称为频域。称为其相角，这在物理上是有良好背景的。-The Fourier transform, engineering technology, often viewed as a time signal, the corresponding space, known as time domain and airspace its Fourier transform as a frequency function, the corresponding space is called the frequency domain. Known as its phase angle, which in physics is a good background.
