What is the simplest formula of some noise signal?
$A(t)=...$
where t is time.
What is the name of a noise, which power spectral density is gaussian?
EDIT 1
Actually I need a function which can be easily calculated over time in Wolfram Mathematica. As for now I generated 1000 pseudo random numbers uniformly distributed from -1 to 1 and the use Interpolation[]. But firstly I think this signal is not "good" and also it is calculated for a long time.