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Audio channel conversion

An audio channel and channel conversion technology, applied in speech analysis, instruments, electrical components, etc., to solve problems such as impossible to provide audio channels

Active Publication Date: 2007-08-08
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The second reason may be coding efficiency
However, it is not feasible to remove the decorrelation unit from the decoder, as this would make it impossible to provide audio channels with correct inter-channel correlation

Method used

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Examples

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Embodiment Construction

[0034] The prior art device 1' shown in Figure 1 comprises an array 3 of decorrelation elements and an upmixing element 4. The device has M inputs 5 and N outputs 6 all coupled to an upmix unit 4 . Each input 5 receives an audio channel of a group of audio channels which together form a multi-channel audio signal.

[0035] The number of output channels (N outputs 6) is greater than the number of input channels (M inputs 5). Exemplary values ​​are N=6 and M=2, such as when a stereo audio signal is converted to a 5.1 audio signal, or N=2 and M=1, such as when a stereo signal is encoded as a mono signal plus additional information , although other values ​​of M and N are possible. The output channels typically have a (shared) correlation defined by the parameters fed to the upmix unit 4 . In order to produce output channels with the desired correlation, a set of mutually decorrelated channels is derived from the input channels. To this end, a decorrelation unit 3 is coup...

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Abstract

A device (1) for converting a first number (M) of input audio channels into a second, larger number (N) of output audio channels comprises: decorrelation units (3) for decomposing the input audio channels into a set of decorrelated auxiliary channels, at least one upmix unit (4) for combining the decorrelated auxiliary channels into the output audio channels, and at least one pre-processing unit (2) for pre-processing the input audio channels and feeding the pre-processed input audio channels to the decorrelation units (3). The pre-processing unit (2) and the upmix unit (4) are preferably controlled by audio parameters.

Description

technical field [0001] The present invention relates to audio channel conversion. More specifically, the present invention relates to an apparatus and method for converting a first number of input audio channels into a second number of output audio channels, said first number being smaller than said second number. Background technique [0002] Converting multiple audio channels into another larger number of audio channels is well known. This may be done for various reasons. The first reason may be conversion to a new format. Stereo recordings have, for example, only two channels, whereas modern audio systems typically have five or six channels, as in the popular "5.1" systems. Therefore, two stereo channels must be converted to five or six channels in order to take full advantage of advanced audio systems. The second reason may be coding efficiency. It has been found that a stereo audio signal can be encoded as a mono channel audio signal incorporating a parametric bit ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00H04S5/00G10L19/008
CPCG10L19/008H04S5/005H04S5/00
Inventor D·J·布里巴阿特E·G·P·舒伊杰斯H·普恩哈根K·J·罗登
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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