G - Physics – 10 – L
Patent
G - Physics
10
L
G10L 19/00 (2006.01) G10L 21/00 (2006.01)
Patent
CA 2185790
Apparatus and methods for including a code (68) having at least one code frequency component in an audio signal (60) are provided. The abilities of various frequency components in the audio signal to mask the code frequency component to human hearing are evaluated (64), and based on these evaluations an amplitude (76) is assigned to the code frequency component. Methods and apparatus for detecting a code in an encoded audio signal are also provided. A code frequency component in the encoded audio signal is detected based on an expected code amplitude or on a noise amplitude within a range of audio frequencies including the frequency of the code component.
Dispositifs et méthodes d'incorporation d'un code (68) comportant au moins une composante de fréquence de code dans un signal audio (60). Les capacités que présentent diverses composantes de fréquence d'un signal audio à masquer la composante de fréquence de code pour l'oreille humaine sont évaluées (64), après quoi une amplitude (76) est attribuée à la composante de fréquence de code sur la base de ces évaluations. L'invention porte également sur les méthodes et dispositifs permettant de détecter un code dans un signal audio codé. La composante de fréquence de code d'un signal audio codé est détectée sur la base de l'amplitude attendue du code ou du bruit dans la plage des fréquences audio incluant la fréquence de la composante du code.
Graybill Robert B.
Hassan Sayed
Jensen James M.
Lynch Wendell D.
Perelshteyn Michael M.
Arbitron Inc.
Perry + Currier
The Arbitron Company
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