Apparatus and method for calculating bandwidth extension...

G - Physics – 10 – L

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G10L 21/02 (2006.01)

Patent

CA 2699316

An apparatus for calculating bandwidth extension data of an audio signal in a bandwidth extension system, in which a first spectral band is encoded with a first number of bits and a second spectral band different from the first spectral band is encoded with a second number of bits, the second number of bits being smaller than the first number of bits, has a controllable bandwidth extension parameter calculator (10) for calculating bandwidth extension parameters for the second frequency band in a frame-wise manner for a sequence of frames of the audio signal. Each frame has a controllable start time instant. The apparatus additionally comprises a spectral tilt detector (12) for detecting a spectral tilt in a time portion of the audio signal and for signaling the start time instant for the individual frames of the audio signal depending on spectral tilt.

Linvention concerne un appareil de calcul de données d'extension de bande passante d'un signal audio dans un système d'extension de bande passante, dans lequel une première bande spectrale est encodée avec un premier nombre de bits et une seconde bande spectrale différente de la première bande spectrale est encodée avec un second nombre de bits, le second nombre de bits étant inférieur au premier nombre de bits. Ledit appareil comporte un calculateur de paramètres d'extension de bande passante contrôlable (10) pour calculer des paramètres d'extension de bande passante pour la seconde bande de fréquence par trame pour une séquence de trames du signal audio. Chaque trame a un instant de début contrôlable. Lappareil comprend en plus un détecteur de balance spectrale (12) pour détecter une balance spectrale dans une partie temporelle du signal audio et pour signaler linstant de début des trames individuelles du signal audio en fonction de la balance spectrale.

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