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Apparatus and method for processing a multichannel audio signal

An audio signal and multi-channel technology, applied in the use of detectable carrier information, voice analysis, information storage, etc., can solve problems such as stereo image distortion, sound quality reduction, and stereo information loss

Active Publication Date: 2019-03-01
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The downside is that the modification of the phase produces an artifact known as "transient tailing", i.e. the temporal envelope of the signal is modified so that the note impact is perceived as having less percussion and sounds less percussive
Processing mono downmixing of the input signal has the disadvantage that stereo information is lost and thus the sound quality is reduced
The main disadvantage of processing each channel signal separately is the introduction of arbitrary decorrelation between channels, which distorts the stereo image

Method used

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  • Apparatus and method for processing a multichannel audio signal
  • Apparatus and method for processing a multichannel audio signal
  • Apparatus and method for processing a multichannel audio signal

Examples

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Embodiment Construction

[0099] figure 2 A block diagram of an embodiment of the inventive method is shown in , for the example of an input signal having two channels (eg left and right channels of stereo sound).

[0100] The input audio signal is x=[x 1 x 2 ] T , where x 1 Indicates the first channel signal, x 2 Indicates the second channel signal. In step STFT, for x 1 and x 2 Compute the short-time Fourier transform (STFT) representation, resulting in X 1 and x 2 .

[0101] According to the invention, in a step named MS, the channel signal (here the transformed channel signal X of the multi-channel audio signal is obtained according to the following formula 1 and x 2 ) to calculate and signal X s sum and difference signal X d :

[0102] x s =(X 1 +X 2 ), (6)

[0103] x d =(X 1 -X 2 ) (7)

[0104] In a different embodiment, the order of STFT and signal combination in step MS is swapped. This takes into account that calculating the sum and difference signals can also be perfor...

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Abstract

An apparatus (1) for processing a multichannel audio signal (100) is provided, comprising a plurality of channel signals (x1, x2). The apparatus performs a time scale modulation of the multichannel audio signal (100) and comprises a phase adaptor (5) and a separator (6). The phase adaptor (5) provides a processed signal (Ys, Yd) by modifying a phase of a signal (Xs, Xd) based on a combination of the channel signals (x1, x2). The separator (6) provides separated signals (Y1, Y2) based on the processed signal (Ys, Yd). Also a corresponding method is provided.

Description

technical field [0001] The invention relates to a device for processing multi-channel audio signals. A multi-channel audio signal includes multiple (ie, at least two) channel signals. The apparatus performs time scale modulation of a multi-channel audio signal. The invention also relates to a corresponding method and computer program. Background technique [0002] Time Scale Modification (TSM) refers to a process for slowing down or speeding up the playback of an audio signal without affecting the pitch. TSM combined with sample rate conversion can also change the pitch without changing the tempo. The challenge for TSM is to preserve all other characteristics of the audio signal (except speed or pitch), especially sound quality. Processing should not produce audible artifacts. [0003] For mono input signals, the main important characteristic is timbre. For signals with more than one channel, the spatial characteristics also need to be preserved. Spatial properties in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B27/00G11B27/28G10L21/04
CPCG11B27/005G11B27/28G10L19/008G10L21/04G10L19/02G10L21/043
Inventor 克里斯丁·乌勒迈克尔·克拉茨保罗·克洛斯蒂莫西·伦纳德安德烈·卢维佐托塞巴斯蒂安·沙勒
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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