High quality time-scaling and pitch-scaling of audio signals

Details High quality time-scaling and pitch-scaling of audio signals High quality time-scaling and pitch-scaling of audio signals

G - Physics

10

L

G10L 19/04 (2006.01) G10L 15/04 (2006.01) G10L 21/04 (2006.01) H04N 5/60 (2006.01) H04N 5/04 (2006.01)

Patent

CA 2443837

In one alternative, an audio signal is analyzed using multiple pschoacoustic criteria to identify a region of the signal in which time scaling and/or pitch shifting processing whould be inaudible or minimally audible, and the signal is time scaled and/or pitch shifted within that region. In another alternative, the signal is divided into auditory events, and the signal is time scaled and/or pitch shifted within an auditory event. In a further alternative, the signal is divided into auditory events, and the auditory events are analyzed using a psychoacoustic criterion to identify those auditory events in which the time scaling and/or pitch shifting procession of the signal would be inaudible or minimally audible. Further alternatives provide for multiple channels of audio.

Selon un mode de réalisation, pour analyser un signal audio, on a recours à plusieurs critères psycho-acoustiques permettant d'identifier une région du signal dans laquelle on veut rendre sensiblement inaudible le traitement d'échelonnement temporel et/ou de décalage du pas, à la suite de quoi on effectue ce traitement dans la région considérée. Selon un autre mode de réalisation, on découpe le signal en événements auditifs, puis on effectue le traitement d'échelonnement temporel et/ou de décalage du pas. Selon encore un autre mode de réalisation, on découpe le signal en événements auditifs, puis, pour analyser les événements auditifs, on utilise un critère psycho-acoustique permettant d'identifier tous les événements auditifs dans lesquels le traitement d'échelonnement temporel et/ou de décalage du pas gagnerait à être sensiblement inaudible. Selon d'autres modes de réalisation enfin, on dispose de plusieurs canaux de signal audio.

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