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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?

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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.

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    Matlab would be better. It has specific function for whatever distribution to generate random sequences. This can simulate any noisy process.2012-02-07
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    Thanks! Which function(s) to use in Matlab (for example)?2012-02-07
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    For a Gaussian, you could use normrnd or also random should do the work. But this can be done with whatever distribution. E.g. normrnd(0,1,1,100) will generate 100 random number, with a Gaussian distribution, in a vector of 100 elements having mean 0 and variance 1. You can take 100 time steps and you have simulated your noise.2012-02-07
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    The same can be done in Mathematica also. I was thinking you are saying Matlab has dedicated functions to generate various noise signals.2012-02-07
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    But this is a noise signal: It is sampled at discrete times.2012-02-07

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