I want to generate a Gaussian white noise as an input to a vibration exciter. Since, it does not follow the high frequencies I need to low pass filter the signal. I need to implement a filter which makes minimum distortion to my signal in terms of temporal correlation of the filtered signal and at the same time attenuates the high frequencies. Can anybody help me with designing this filter? I think I should use an FIR moving average filter, but I do not know which windowing method would be useful!