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本文介绍了IMSL 中快速付立叶变换子程序FFT2C 和付立叶正、反变换的关系,子程序中各参数、数组的选取和建立以及子程序调用的方法。说明通过该子程序的调用解决了时域和频域间的转换问题.使得模拟由各种信号和单元电路组成的系统变成可能.在一般介绍如何模拟各种激励信号、系统的时域单元和频域单元的基础上,给出一个系统模拟的实例,从而证明了该方法的可行性与方便性.
This paper introduces the fast Fourier transform subroutine FFT2C in IMSL and Fourier transform, the relationship between the inverse transformation, the subroutine parameters, array selection and establishment and subroutine call. Which shows that the subroutine call solves the problem of conversion between time domain and frequency domain and makes it possible to simulate a system composed of various signals and unit circuits.In the general introduction of how to simulate various excitation signals, the system time domain unit And frequency domain unit, a system simulation example is given, which proves the feasibility and convenience of this method.