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Coding method, coder, decoding method and decoder for multi-channel audio

An audio coding, multi-channel technology, applied in the field of decoding methods and decoders, multi-channel audio coding methods, and encoders, and can solve problems such as insufficient elimination.

Active Publication Date: 2010-04-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current method of eliminating redundancy in surround sound mainly focuses on PC (Pair-Channels, symmetrical channel pair), and for NPC (Not-Pair-Channels, asymmetrical channel pair), there is a certain elimination effect, but the elimination not strong enough

Method used

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  • Coding method, coder, decoding method and decoder for multi-channel audio
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  • Coding method, coder, decoding method and decoder for multi-channel audio

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Embodiment 1

[0115] In order to improve the codec performance and adaptively change the output playback channel at the decoding end, the embodiment of the present invention provides a multi-channel audio encoding and decoding method. The multi-channel audio includes at least the main channel signal and the surround signal. Channel signal, wherein, the main channel signal includes the left and right main channel signals and the center channel signal, and the surround channel signal includes the left surround channel signal and the right surround channel signal, see figure 2 As shown, the method specifically includes:

[0116] Step 201: Linearly predict the surround channel signal according to the main channel signal to obtain prediction parameters, and add the prediction parameters to the coded stream; or, predict the surround channel signal according to the main channel signal and the transfer function to obtain prediction parameters , add the prediction parameters to the encoded code str...

Embodiment 2

[0122] see image 3 As shown, in order to improve the codec performance and adaptively change the output playback channel at the decoding end, the embodiment of the present invention provides a multi-channel audio coding method, including:

[0123] Step 301: According to the delay parameter, perform multiple delay processing on the left main channel signal L and the right main channel signal R;

[0124] Wherein, the initial delay parameter may be determined according to actual conditions.

[0125] Step 302: Scale the delayed signal according to the scaling parameter;

[0126] Wherein, the initial scaling parameter may be determined according to actual conditions.

[0127] Among them, since the central channel signal is a low-frequency signal, while the left and right main channel signals are mid- and high-frequency signals, in order to make the processed spectrum similar to the original signal and keep it intact, the signal needs to be scaled to a certain extent.

[0128] S...

Embodiment 3

[0187] see Figure 7 , in order to improve the codec performance and adaptively change the output playback channel at the decoding end, an embodiment of the present invention provides a multi-channel audio encoder, wherein the multi-channel audio at least includes the main channel signal and the surround Channel signals, wherein the main channel signals include left and right main channel signals and center channel signals, and the surround channel signals include left surround channel signals and right surround channel signals. The multi-channel audio encoder specifically includes :

[0188] A first prediction module 70 , a second prediction module 71 , a correlation judgment module 72 , a correlation coding module 73 and an irrelevance coding module 74 .

[0189] The first prediction module 70 is used to linearly predict the surround channel signal according to the main channel signal to obtain a prediction parameter, and add the prediction parameter to the encoded code str...

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Abstract

The invention discloses a coding method, a coder, a decoding method and a decoder for multi-channel audio and belongs to the technical field of audio processing. The coding method for multi-channel audio includes steps of acquiring predicated parameters by performing linear predication on surround channel signals according to main channel signals and adding the predicated parameters to a coding code stream, or acquiring predicated parameters by predicating the surround channel signals according to the main channel signals and transmission functions and adding the predicated parameters to the coding code stream; and judging whether the surround channel signals relate to center channel signals or not, or judging whether the surround channel signals relate to left main channel signals and right main channel signals or not, and if so, then coding the predicated parameters, the main channel signals and the judging information of relevance. The invention further discloses a coder, a decoding method and a decoder for multi-channel audio. By aids of the coding method, the coder, the decoding method and the decoder for multi-channel audio, coding and decoding performances are improved, and output replay channels can be changed at a decoding terminal adaptively.

Description

technical field [0001] The present invention relates to the technical field of audio processing, in particular to a multi-channel audio encoding method, encoder, decoding method and decoder. Background technique [0002] The frequency range of audio (Audio) signal is from 20Hz to 20000Hz. The processing process of audio signal should not only consider its characteristics as a signal, try to ensure that it is not distorted, but also consider the sensory characteristics of human acoustic function for audio signals. Signal processing can reduce the computational load and complexity of processing as much as possible on the premise of ensuring the human auditory experience. [0003] Most of the relatively successful multi-channel audio codec systems in the prior art adopt the sensory audio codec based on the psychoacoustic model. For example, technologies known in the art include Dolby AC-3 and MPEG AAC (Advanced Audio Coding, advanced audio coding) five-channel surround sound s...

Claims

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Application Information

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IPC IPC(8): H04S3/00
Inventor 窦维蓓刘光明
Owner TSINGHUA UNIV
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