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Apparatus, method or computer program for estimating an inter-channel time difference

A time difference and channel technology, applied in the field of multi-channel processing, can solve the problem of not optimal robustness

Pending Publication Date: 2021-01-22
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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  • Application Information

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Problems solved by technology

[0012] However, it has been shown that the robustness of this general technique is not optimal especially in signals different from e.g. clean speech without any reverberation or background noise

Method used

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  • Apparatus, method or computer program for estimating an inter-channel time difference
  • Apparatus, method or computer program for estimating an inter-channel time difference

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Embodiment Construction

[0078]Figure 10a An embodiment for estimating the inter-channel time difference between the first channel signal such as the left channel and the second channel signal such as the right channel is shown. These channels are input to the time-spectrum converter 150, which is relative toFigure 4e As item 451 additional explanation.

[0079]In addition, the time domain representations of the left channel and right channel signals are input into the calculator 1020 for calculating the cross-correlation spectrum for the time block from the first channel signal in the time block and the second channel signal in the time block (cross-correlation spectrum). In addition, the device includes a spectral feature estimator 1010 for estimating the spectral feature of the first channel signal or the second channel signal of the time block. The device further includes a smoothing filter 1030 for smoothing the cross-correlation spectrum in time using the spectral features to obtain a smoothed cross-corr...

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Abstract

An apparatus for estimating an inter-channel time difference between a first channel signal and a second channel signal, comprises a signal analyzer (1037) for estimating a signal characteristic (1038) of the first channel signal or the second channel signal or both signals or a signal derived from the first channel signal or the second channel signal; a calculator (1020) for calculating a cross-correlation spectrum for a time block from the first channel signal in the time block and the second channel signal in the time block; a weighter (1036) for weighting a smoothed or non-smoothed cross-correlation spectrum to obtain a weighted cross correlation spectrum using a first weighting procedure (1036a) or using a second weighting procedure (1036b) depending on a signal characteristic estimated by the signal analyzer (1037), wherein the first weighting procedure is different from the second weighting procedure; and a processor (1040) for processing the weighted cross-correlation spectrumto obtain the inter-channel time difference.

Description

Technical field[0001]This application relates to stereo processing, or generally to multi-channel processing, where a multi-channel signal has two channels, such as the left and right channels in the case of a stereo signal, or more than two channels, such as three, Four, five or any other number of channels.Background technique[0002]Compared with the storage and broadcasting of stereo effect music, stereo voice, especially conversational stereo voice, has received much less scientific attention. Indeed, in voice communication, single-channel transmission is still mostly used. However, with the increase of network bandwidth and capacity, it is foreseeable that communication based on stereo effect technology will become more common and bring a better listening experience.[0003]High-efficiency encoding of stereo audio materials has been studied for a long time in perceptual audio encoding of music for efficient storage or broadcasting. In high bit rate situations where waveform preser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/008G10L25/06
CPCH04R5/04G10L19/0017G10L19/008H04W24/04H04W56/001G10L25/06G10L25/18G10L21/0216
Inventor 埃伦妮·福托波罗简·布埃斯伊曼纽·拉维利帕拉维·马本马丁·迪茨弗兰兹·鲁特胡伯斯蒂芬·多拉斯里坎特·科塞
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV