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A method and apparatus for performing an adaptive down- and up-mixing of a multi-channel audio signal

Through the downmix blocking matrix and Carlo-Low transformation matrix based on the inter-channel covariance matrix, the problem of being unable to retain spatial characteristics and achieve backward compatibility in the adaptive downmixing and upmixing processes of multi-channel audio signals is solved. Efficient encoding and decoding, reducing complexity and rate-distortion performance.

Active Publication Date: 2014-01-01
HONOR DEVICE CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

However, this conventional method described by Hausho et al. is only effective for a small number of channels
Furthermore, the coding performance of this conventional downmixing method is not optimal in terms of rate-distortion performance
[0007] Conventional adaptive downmixing methods either support an arbitrary number of channels, but fail to preserve the spatial characteristics of the original multi-channel audio signal, that is to say backwards compatibility cannot be achieved; Preserves the spatial characteristics of the original multi-channel audio signal, but is only available for multi-channel audio signals with a limited number of audio channels

Method used

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Embodiment Construction

[0065] as in figure 1 As seen in , in the illustrated embodiment, an audio system 1 according to an aspect of the invention may comprise at least one encoding device 2 and at least one decoding device 3 connectable via a network or signal line 4 . exist figure 1 In the embodiment shown, the encoding device 2 may comprise a signal input 5 to which a multi-channel audio signal may be applied. This multi-channel audio signal may contain M input channels. exist figure 1 In the exemplary embodiment shown, the input multi-channel audio signal is applied to a pre-processing block 6 for pre-processing the received multi-channel audio signal. In a possible embodiment, the pre-processing block 6 may perform delay alignment between input channels of the received multi-channel audio signal and / or time-frequency transformation between input channels of the received multi-channel audio signal. The pre-processing block 6 supplies the pre-processed multi-channel audio signal to a down-mix...

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Abstract

A method and apparatus for performing an adaptive down-mixing of a multichannel audio signal comprising a number of input channels,wherein a signal adaptive transformation of said input channels is performed by multiplying the input channels with a downmix block matrix comprising a fixed block for providing a set of backward compatible primary channels and a signal adaptive block for providing a set of secondary channels.

Description

technical field [0001] The invention relates to a method for performing adaptive downmixing and subsequent upmixing of a multi-channel audio signal. In particular, the method relates to downmixing and upmixing operations commonly used in multi-channel audio coding or spatial audio coding. Background technique [0002] The invention relates to a method for performing adaptive downmixing and subsequent upmixing of a multi-channel audio signal. In particular, the method relates to downmixing and upmixing operations commonly used in multi-channel audio coding or spatial audio coding. [0003] Conventional adaptive downmix methods use signal-dependent downmix transforms. Depending on the specific implementation of the signal, the most efficient downmix transform is selected from the set of available downmix transforms. For example, in the case of stereo coding, the downmix transform of a stereo coding scheme may be selected from a group consisting of two different downmix tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/008
CPCG10L19/008
Owner HONOR DEVICE CO LTD