Method and apparatus for embedding auxiliary data in primary...

H - Electricity – 04 – B

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H04B 1/69 (2006.01) G10L 19/00 (2006.01) G10L 19/02 (2006.01) G10L 19/04 (2006.01) H04B 1/707 (2006.01) H04J 13/00 (2006.01)

Patent

CA 2346092

Auxiliary data (x(m)) is transported in subbands (si(k)) of a primary data signal (s(t)) by hiding the data in the form of colored noise. The colored noise (pci(k)) has a spectrum that simulates the spectrum of the primary data signal in each subband (si(k)). The data to be transported is first converted to a spread spectrum signal (p(n)). The primary data signal (si(k)) is analysed (88) to determine its spectral shape. The same spectral shape is imparted (94) to the spread spectrum signal in each subband (pi(k)), which is then combined (100) with the primary data signal for transmission. The spectral shaping can be performed using time domain modeling (88) and synthesis (94) such as linear predictive coding. A plurality of different auxiliary information streams (AUX. DATA A, B, ..., N) can be transported on the primary data signal (s(t)). By adjusting the gain (287, 297, 307) of individual spread spectrum signal carrier(s) and the power of the colored noise, the auxiliary information stream(s) can be rendered at any desired level below or above an interference threshold in the primary data signal (s(t)).

On achemine des données auxiliaires (x(m)) dans les sous-bandes (s¿i?(k)) d'un signal de données primaires (s(t)) en masquant les données sous la forme de bruit coloré (p¿ci?(k)). Le spectre de ce bruit simule le spectre du signal de données primaires à l'intérieur de chaque sous-bande (s¿i?(k)). Les données acheminées sont d'abord converties en un signal à spectre étalé (p(n)). On analyse (88) le signal de données primaires (s¿i?(k)) pour en déterminer la forme spectrale. On applique (94) la même forme spectrale au signal à spectre étalé dans chaque sous-bande (p¿i?(k)) qui est ensuite combiné (100) avec le signal de données primaires aux fins de transmission. Cette mise en forme spectrale est réalisable par modelage du domaine temporel (88) et synthèse (94) du type codage prédictif linéaire. Plusieurs flux différents de données auxiliaires (AUX. DATA A, B, ..., N) peuvent être acheminés sur le signal de données primaires (s(t)). En réglant le gain (287, 297, 307) de la ou des porteuses de signal à spectre étalé et la puissance du bruit coloré, on peut restituer le ou les flux de données auxiliaires à un niveau quelconque au-dessous ou au-dessus d'un seuil de brouillage dans le signal de données auxiliaires (s(t)).

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