Introduction - If you have any usage issues, please Google them yourself
1, using Matlab to generate sine wave, square wave, and shows the respective time-domain waveform
2, FFT transform, display each spectrum, where the sampling rate, frequency, length of data demand, requirements specified
3, three maps drawn rms signal
4, the reply signal by IFFT, the sinusoidal signal and displays the recovered time-domain waveform.