1. A method for generating an analog Gaussian noise signal comprising: providing one of a pulse-density modulated 1-bit sequence and a pulse-density modulated multi-bit sequence representing a Gaussian noise signal having a predetermined probability distribution function, bandwidth and center frequency; and, processing the one of a pulse-density modulated 1-bit sequence and a pulse-density modulated multi-bit sequence to generate a corresponding analog Gaussian noise signal having a predetermined probability distribution function, bandwidth and center frequency.