G - Physics – 10 – L
Patent
G - Physics
10
L
G10L 19/00 (2006.01)
Patent
CA 2698600
An encoding apparatus comprises a frame processor (105) which receives a multi channel audio signal comprising at least a first audio signal from a first microphone (101) and a second audio signal from a second microphone (103). An ITD processor (107) then determines an inter time difference between the first audio signal and the second audio signal and a set of delays (109, 111) generates a compensated multi channel audio signal from the multi channel audio signal by delaying at least one of the first and second audio signals in response to the inter time difference signal. A combiner (113) then generates a mono signal by combining channels of the compensated multi channel audio signal and a mono signal encoder (115) encodes the mono signal. The inter time difference may specifically be determined by an algorithm based on determining cross correlations between the first and second audio signals.
L'invention porte sur un appareil de codage qui comporte un processeur de trame (105) qui reçoit un signal audio à multiples canaux comportant au moins un premier signal audio provenant d'un premier microphone (101) et un second signal audio provenant d'un second microphone (103). Un processeur ITD (107) détermine alors une inter différence temporelle entre le premier signal audio et le second signal audio et un ensemble de retards (109, 111) génère un signal audio à multiples canaux compensé à partir du signal audio à multiples canaux en retardant au moins l'un des premier et second signaux audio en réponse au signal d'inter différence temporelle. Un dispositif de combinaison (113) génère ensuite un mono signal en combinant des canaux du signal audio à multiples canaux compensé et un codeur de mono signal (115) code le mono signal. L'inter différence temporelle peut être précisément déterminée par un algorithme à partir de la détermination d'inter corrélations entre les premier et second signaux audio.
Gowling Lafleur Henderson Llp
Motorola Inc.
Motorola Mobility Inc.
LandOfFree
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