Methods and apparatus to perform audio watermarking and...

G - Physics – 10 – L

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G10L 19/00 (2006.01) H04H 20/31 (2009.01) H04N 7/26 (2006.01)

Patent

CA 2705549

Encoding and decoding methods and apparatus as described. In one example, a method of embedding auxiliary information into an audio signal includes sampling the audio signal to create an audio block; receiving a code; determining frequency components that will be used to represent the code, wherein different sets of frequency components represent respectively different information and wherein one frequency component from each set of frequency components is located in a code band and there are multiple code bands and spacing between adjacent code bands is equal to or less than the spacing between adjacent frequency components of each code band; determining amplitudes of the frequency components that will be used to represent the information, wherein the amplitudes of the frequency components are determined by a masking ability of the audio block; synthesizing the frequency components that will be used to represent the information, wherein the frequency components are synthesized with the determined amplitudes; and combining the synthesized code frequency components with the audio block.

La présente invention concerne des procédés et des dispositifs de codage et de décodage. Dans un exemple, un procédé d'imbrication d'informations auxiliaires dans un signal audio comprend les étapes consistant à échantillonner le signal audio pour créer un bloc audio; recevoir un code; déterminer les composants de la fréquence qui seront utilisés pour représenter le code, différents ensembles de composants de la fréquence représentant respectivement différentes informations et un composant de la fréquence de chaque ensemble de composants de la fréquence se trouvant dans une bande de code et il y a de multiples bandes de code et l'espace entre les bandes de code adjacentes est égal ou inférieur à l'espace entre les composants de fréquence adjacents de chaque bande de code; déterminer les amplitudes des composants de la fréquence qui seront utilisés pour représenter les informations, les amplitudes des composants de la fréquence étant déterminées par la capacité de masque du bloc audio; synthétiser les composants de la fréquence qui seront utilisés pour représenter les informations, les composants de la fréquence étant synthétisés avec les amplitudes prédéterminées; et combiner les composants de la fréquence du code avec le bloc audio.

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