Generation of thermal agitation noise according to a...

G - Physics – 06 – F

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G06F 7/58 (2006.01) G06F 1/035 (2006.01)

Patent

CA 2541315

The invention relates to a method and device for generating a thermal agitation noise and to the thus obtained thermal agitation noise. The aim of said invention is to deliver a method for generating a thermal agitation noise comprising a certain number of points according to a predetermined histogram and corresponding at least to a frequency. The inventive method consists in generating a noise by several successive sequences {h (kN+n)}¿1<=n<=N? of M.N points (M, N are integers>=1), [S2] selecting in a random and independent manner a base sub-sequence(s) {h¿lm? (n)} ¿1<=n<=N, m<=M? for each sequence M amongst at least L base sub-sequence(s) of N conforming points (L is integer >=1), thereby making it possible to obtain a line-free thermal agitation noise spectrum without a simple sub-sequence repetition. In the second variant, said inventive method also consists in [S6] randomly and independently selecting a temporal reading of each selected base sub-sequence for each sequence. In the third variant, said invention also proposes [S8] an E interleaving of M selected sub-sequences for each sequence.

L'invention concerne un procédé et un dispositif de génération d'un bruit d'agitation, et le bruit d'agitation obtenu. Un objet de l'invention est un procédé de génération d'un bruit d'agitation comportant un nombre quelconque de points, à histogramme prédéterminé, conformé autour d'au moins une fréquence comportant:- la génération du bruit par une succession de plusieurs séquences {h(kN+n)}1<=n<=N de M.N points (M, N entiers >=1),- [S2]: le choix pour chaque séquence de M sous-séquence(s) de base {hlm(n)}1<=n<=N, m<=M de manière aléatoire et indépendante parmi au moins L sous-séquence(s) de base de N points conformées (L entier >=1), - [S4]: le choix de manière aléatoire et indépendante, pour chaque séquence, du signe. Ainsi, en ne faisant pas une simple répétition de la sous-séquence, le spectre du bruit d'agitation obtenu n'a pas de raies. Une deuxième variante de l'invention comporte en outre [S6]: le choix de manière aléatoire et indépendante, pour chaque séquence, du sens de lecture temporelle de chacune des sous-séquence de base choisie. Une troisième variante de l'invention propose en outre, pour chaque séquence, [S8]: l'entrelacement E des M sous-séquences choisies.

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