Audio signal decoding device and audio signal encoding device

Details Audio signal decoding device and audio signal encoding device Audio signal decoding device and audio signal encoding device

G - Physics

10

L

G10L 19/02 (2006.01)

Patent

CA 2572805

The three main processes in the conventional invention for encoding the multi- channel audio signal are: generation of a reverberation signal by using an all pass filter; division of a signal by time and a frequency axis for level adjustment; and mixing of the encoded binaural signal with the original signal encoded up to the fixed crossover frequency. These processes include the problems mentioned in this invention. The present invention presents three embodiments: an inter-channel interference queue is used to dynamically adjust the all pass filter coefficient so as to control spread of the reverberation; the signal division along the time axis is performed in small units for low frequency and in rough units for high frequency; the crossover frequency for mixing is controlled by the bit rate and when the original audio quantization is rough, the down mix signal is mixed with the original audio signal with a ratio decided by the inter-channel interference queue.

Les trois principaux processus de la présente invention destinés iddot;coder le signal sonore multivoie sont: la production d'un signal de réverbération au moyen d'un filtre passe-tout;a division d'un signal par un axe du temps et un axe de la fréquence pour le réglage de niveau; et le mélange du signal binau cod·avec le signal original cod·jusqu'·la fréquence de coupure fixée. Ces processus prennent en charge s problèmes mentionnés dans la présente invention. On décrit troides de réalisation: une file d'attente des interferences ente les voies est utilisée pour régler de façon dynamique le coeffint du filtre passe-tout en vue de contrôler l'étalement de lréverbération; la division du signal le long de l'axe du tem est effectuée en petites unités pour les basses fréquences et enités approximatives pour les hautes fréquences; la fréquence de cure pour le mélange est contrôl

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