Energy dependent quantization for efficient coding of spatial audio parameters

一种能量度量、参数的技术，应用在语音分析、代码转换、数字记录/再现等方向，能够解决浪费带宽等问题，达到提高感觉音质、补充信息大小减少的效果

Active Publication Date: 2007-07-04
DOLBY INT AB +2
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Problems solved by technology

[0021] As detailed in the previous paragraph, a level parameter (IID or ICLD) describing the spatial perception of a multi-channel audio signal or other such as ICC, phase difference or time difference Quantization of parameters is still suboptimal, as bandwidth may be wasted for spatial parameters describing channels that are mostly masked due to low energy within the channel

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  • Energy dependent quantization for efficient coding of spatial audio parameters
  • Energy dependent quantization for efficient coding of spatial audio parameters
  • Energy dependent quantization for efficient coding of spatial audio parameters

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[0061] FIG. 1 shows a parameter quantizer 199 of the present invention having a quantizer 200 and a quantizer selector 202 . The quantizer selector 202 receives the local energy of a channel or pair of channels and the total energy of the multi-channel audio signal according to the parameters to be encoded. Based on the two energy information, the quantizer selector 202 generates a quantization rule that is used by the quantizer 200 to derive quantized parameters 204 from the parameters 206 input to the quantizer 200 . Therefore, in this case, the quantizer selector 202 functions as a quantization rule generator.

[0062] The input parameters to the quantizer selector 202 are the total energy of the original multi-channel signal and the local energy of the channels described by the parameters to be quantized. In a preferred embodiment of the invention, the ratio between Local Energy and Total Energy gives a metric that can be used to decide which quantizer to use. As an exam...

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Abstract

Parameters being a measure for a characteristic of a channel or of a pair of channels, wherein the parameter is a measure for a characteristic of the channel or of the pair of channels with respect to another channel of a multi-channel signal can be quantized more efficiently using a quantization rule that is generated based on a relation of an energy measure of the channel or the pair of channels and an energy measure of the multi-channel signal. With generation of the quantization rule taking into account a psycho acoustic approach, the size of an encoded representation of the multi-cha nnel signal can be decreased by coarser quantization without significantly disturbing the perceptual quality of the multi-channel signal when reconstructed from the encoded representation.

Description

technical field [0001] The present invention relates to quantization of spatial audio parameters and in particular to a concept allowing for more efficient compression without significantly reducing the perceived sound quality of an audio signal reconstructed using quantized spatial audio parameters. Background technique [0002] Recently, multi-channel audio reproduction technology is becoming more and more important. Considering the efficient transmission of multi-channel audio signals with 5 or more independent audio channels, several methods of compressing stereo or multi-channel signals have been developed. State-of-the-art methods for parametric coding of multi-channel audio signals (parametric stereo (PS), "Binaural Cue Coding (BCC)", etc.) are supplemented by downmixing the signal (which may be monophonic or containing several channels) and parametric The information represents a multi-channel audio signal, and the parameter supplementary information is also called ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00
CPCG10L19/008G10L19/03H03M7/30G11B20/10G10L19/08
Inventor 约纳斯·罗登约纳斯·恩德加德海科·普恩哈根杰罗恩·布瑞巴特埃里克·舒伊杰尔斯史蒂文·范德帕尔约翰尼斯·希尔皮尔特卓尔根·赫瑞
Owner DOLBY INT AB
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