Step 5: According to the sound spectrum, inversion of time-domain graphics. (With distortion) Step six: to carry out inverse Fourier transform frequency domain IFFT and painted graphics.

• 步骤五：根据该声音的频谱，反演时域图形 。（有失真） 步骤六：进行付立叶逆变换IFFT并画频域图形 。