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Determining the inter-channel time difference of a multi-channel audio signal

An inter-channel time difference, audio signal technology, applied in the field of audio coding and/or decoding, can solve the problem that the algorithm does not allow accurate tracking of ICTD, does not allow accurate tracking of ICTD, etc.

Active Publication Date: 2013-11-20
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, the algorithm described in [1] using temporally smoothed ICTD does not allow accurate tracking of ICTD, especially when the signal features (ICC, ICTD and ICLD) evolve rapidly in time

Method used

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  • Determining the inter-channel time difference of a multi-channel audio signal
  • Determining the inter-channel time difference of a multi-channel audio signal
  • Determining the inter-channel time difference of a multi-channel audio signal

Examples

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Embodiment Construction

[0044] In the figures, the same reference numerals are used for similar or corresponding elements.

[0045] will now refer to Figure 5 to describe an example of a basic method for determining an inter-channel time difference of a multi-channel audio signal having at least two channels.

[0046] Step S1 comprises determining the inter-channel correlation ICC based on a cross-correlation function involving at least two different channels of the multi-channel audio signal at a plurality of consecutive time instants, wherein each value of the inter-channel correlation Associated with the corresponding value of the inter-channel time difference ICTD.

[0047] This may eg be a cross-correlation function of two or more different channels (usually a pair of channels), but also a cross-correlation function between different combinations of channels. More generally, this can be a cross-correlation function of a set of channel representations comprising at least a first representation...

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Abstract

There is provided a method and device 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, of 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.

Description

technical field [0001] The present technique generally relates to the field of audio encoding and / or decoding and the problem of determining inter-channel time differences of multi-channel audio signals. Background technique [0002] Spatial or 3D audio is a general representation for representing various types of multi-channel audio signals. Depending on the acquisition method and the rendering method, the audio scene is represented in a spatial audio format. For example, typical spatial audio formats defined by acquisition methods (microphones) are represented as stereo, binaural, surround, etc. Spatial audio rendering systems (headphones or speakers), often denoted as surround sound systems, can utilize stereo (left and right channels 2.0) or more advanced multi-channel audio signals (2.1, 5.1, 7.1, etc.) to render a spatial audio scene. [0003] Recently developed technologies for transmitting and processing such audio signals allow end users to have an enhanced audio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/008H04S7/00
CPCH04S7/00G10L19/008G10L19/20H04R2499/11H04S3/008H04S2420/01H04S2420/03
Inventor 曼纽尔·白里安托马斯·特夫特加德·詹森
Owner TELEFON AB LM ERICSSON (PUBL)
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