| 摘要 |
A process and device for generation of a random signal, and a digital-analog conversion system using such a random signal. The process includes a first noise generation step, a second noise filtering step to obtain a signal x(t) with a predetermined spectral envelope H(f), a third step in which a non-linear function g is applied to the signal x(t) in order to give a signal y(t) similar to a predetermined amplitudes histogram f(y), the function g being defined by the following relation:where the function P is the histogram of the signal x(t) to which the third step is applied, and a fourth step in which a pulse response filtering w(t) is applied to the signal y(t) to correct its spectral envelope and obtain an output signal s(t) with a predetermined spectral envelope H(f). The pulse response w(t) is the inverse Fourier transform of a frequency function W obtained by dividing the function H(f) by the modulus Y2(f) of the Fourier transform of the signal y(t). Such a process, device, and system may find particular application to a direct digital frequency synthesis, such as in radar or instrumentation applications.
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