Data dissemination system

Details Data dissemination system Data dissemination system

H - Electricity

04

B

H04B 14/08 (2006.01) H04B 1/66 (2006.01) H04H 1/00 (2006.01)

Patent

CA 2222198

The invention relates to a system for broadcasting data (D), said information being transmitted in the pass-band of a broadcast audio frequency signal (S), characterized in that it comprises means for determining in at least one frequency band (F'13, ..., F'24) of the amplitude (A'13, ..., A'24) of the audio frequency signal (S) and for comparing said amplitude with an audio mask level (Nm(13), ..., Nm(24)) associated to said frequency band, means for removing frequency components from the audio frequency signal in said frequency band if the amplitude of the signal is lower than the audio mask level of said band, and means for inserting said data in said frequency band at a level lower than or equal to the audio mask level of said frequency band.

Image L'invention concerne un système de diffusion de données (D), ces Informations étant transmises dans la bande passante d'un signal audiofréquentiel (S) diffusé, caractérisé en ce qu'il comprend des moyens de détermination dans au moins une bande de fréquence (F'13, ..., F'24) de l'amplitude (A'13, .... A'24) du signal audiofréquentiel (S) et de comparaison de cette amplitude avec un niveau de masque auditif (Nm(13), ..., Nm(24)) associé à cette bande de fréquence, des moyens d'élimination des composantes fréquentielles du signal audiofréquentiel dans ladite bande de fréquence si l'amplitude du signal est inférieure au niveau de masque auditif de ladite bande, et des moyens d'insertion desdites données dans cette bande de fréquence à un niveau inférieur ou égal au niveau de masque auditif de ladite bande de fréquence.

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