DETERMINING THE INTER-CHANNEL TIME DIFFERENCE OF A MULTI-CHANNEL AUDIO SIGNAL

摘要

A method and device are disclosed for determining an inter-channel time difference of a multi-channel audio signal having at least two channels. A determination is made at a number of consecutive time instances, inter-channel correlation based on a cross-correlation function involving at least two different channels of the multi-channel audio signal. Each value of the inter-channel correlation is associated with a corresponding value of the inter-channel time difference. An adaptive inter-channel correlation threshold is adaptively determined based on adaptive smoothing of the inter-channel correlation in time. A current value of the inter-channel correlation is then evaluated in relation to the adaptive inter-channel correlation threshold to determine whether the corresponding current value of the inter-channel time difference is relevant. Based on the result of this evaluation, an updated value of the inter-channel time difference is determined.

主权项

1. A method for determining an inter-channel time difference of a multi-channel audio signal having at least two channels, wherein said method comprises the steps of:
determining, at a number of consecutive time instances, an inter-channel correlation based on a cross-correlation function involving at least two different channels of the multi-channel audio signal, wherein each value of the inter-channel correlation is associated with a corresponding value of the inter-channel time difference; adaptively determining an adaptive inter-channel correlation threshold; evaluating a current value of inter-channel correlation in relation to the adaptive inter-channel correlation threshold to determine whether the corresponding current value of the inter-channel time difference is relevant; and determining an updated value of the inter-channel time difference based on the result of this evaluation.