Patent ID: 8577045
Filing Date: 2013-11-05
Classification: G10L,H03M,H04S

Abstract:
1. An apparatus for encoding a multi channel audio signal, the apparatus comprising: a receiver for receiving the multi channel audio signal comprising at least a first audio signal from a first microphone and a second audio signal from a second microphone; a time difference unit for determining an inter time difference between the first audio signal and the second audio signal by combining successive observations of cross-correlations between the first audio signal and the second audio signal for a plurality of offsets for determining the inter time difference in response to the cross correlations and where the cross-correlations are processed to derive probabilities that are accumulated using a modified Viterbi algorithm and wherein the time difference unit comprises a delay unit for generating a compensated multi channel audio signal from the multi channel audio signal by delaying at least one of the first audio signal and the second audio signal in response to the inter time difference signal; a mono unit for generating a mono signal by combining channels of the compensated multi channel audio signal; and a mono signal encoder for encoding the mono signal.