Adaptive residual audio coding

An audio encoder and encoding technology, applied in the field of encoding and decoding of audio signals, can solve problems such as high bandwidth and limitations

Active Publication Date: 2008-04-09
DOLBY INT AB +1
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AI Technical Summary

Problems solved by technology

MS techniques have limitations when there is a large intensity difference between the left and right channel

Method used

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  • Adaptive residual audio coding
  • Adaptive residual audio coding
  • Adaptive residual audio coding

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Embodiment Construction

[0047] FIG. 1 shows a block diagram of an audio encoder 10 of the present invention, including a downmixer 12 , a limiter 14 , and a parameter extractor 16 .

[0048] A stereo signal 18 having left and right channels is input into the down-mixer 12 and the parameter extractor 16 simultaneously. The parameter extractor 16 extracts spatial parameters 19 describing the correlation between the left and right channels of the stereo signal 18 . These parameters are available on the one hand for transmission and on the other hand are also input into the limiter 14 . The limiter 14 applies limiting rules to the parameters. Details of appropriate restriction rules should be derived in subsequent sections.

[0049] The limiter derives the limited spatial parameters and inputs them into the down-mixer 12, which applies down-mixing rules to the left and right channels of the stereo signal 18 in order to A downmix signal 20 and a residual signal 22 are derived from the left and right ch...

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Abstract

An audio signal having at least two channels can be efficiently down-mixed into a downmix signal and a residual signal, when the down-mixing rule used depends on a spatial parameter that is derived from the audio signal and that is post-processed by a limiter to apply a certain limit to the derived spatial parameter with the aim of avoiding instabilities during the up-mixing or down-mixing process. By having a down-mixing rule that dynamically depends on parameters describing an interrelation between the audio channels, one can assure that the energy within the down-mixed residual signal is as minimal as possible, which is advantageous in the view of coding efficiency. By post processing the spatial parameter with a limiter prior to using it in the down-mixing, one can avoid instabilities in the down- or up-mixing, which otherwise could result in a disturbance of the spatial perception of the encoded or decoded audio signal.

Description

technical field [0001] The invention relates to the encoding and decoding of audio signals, in particular to efficient high-quality encoding of pairs of audio channels. Background technique [0002] Recently, with the widespread use of digital distribution of compressed audio or video content, such as by satellite or terrestrial digital audio or video broadcasting, efficient high quality encoded audio signals have become increasingly important. For example, the known MP3 technology allows for the convenient transmission of audio titles over the Internet or other transmission channels with limited bandwidth. [0003] In addition to MP3, the goal of many other audio coding structures is to maximize the audio quality for a given compression ratio or bit rate. It has been demonstrated in "Efficient and scalable Parametric Stereo Coding for Low Bit rate Audio Coding Application" of PCT / SE02 / 01372 that when additionally using a compact representation of a stereo signal, commonly ...

Claims

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Application Information

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IPC IPC(8): G10L19/00
CPCG10L19/008
Inventor 拉斯·维莱摩尔斯法兰寇斯·菲利普司·梅布格
Owner DOLBY INT AB
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