Introduction - If you have any usage issues, please Google them yourself
The first program to simulate the amount of generating a normal random sequence X (n), a random sequence of waveforms generated by the correlation function draw (with comparative theoretical curve)
And power spectral density. The second program to generate a signal X (n), and draw the signal amplitude spectrum curve, move to the left when the center frequency f0 = 200Hz, obtaining low-pass equivalent signal, and draw its amplitude spectrum signal with phase and quadrature components of the envelope. When the center frequency shift f0 = 100Hz left when obtaining low-pass equivalent signal, and draw its magnitude spectrum, the in-phase signal and quadrature component envelope.