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Parameter stereo coding, decoding method based on inter-channel transfer function

A parametric stereo and transfer function technology, applied in the field of decoding and parametric stereo coding, can solve problems such as only considering intra-frame compression, lack of high-frequency detail signals, and ignoring signal time-domain correlation.

Active Publication Date: 2016-03-16
PEKING UNIV
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Problems solved by technology

This method has two disadvantages. One is that the high-frequency signal is highly compressed, resulting in the loss of high-frequency detail signals; the other is that only intra-frame compression is considered, and the time-domain correlation of the signal is ignored.

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  • Parameter stereo coding, decoding method based on inter-channel transfer function
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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0033] Encoding process:

[0034] At the encoding end, the left and right channel signals are used to generate the downmix signal, and the input right channel signal (or left channel signal) and the downmix signal are divided into frames respectively, and the inter-channel transfer function of each frame is extracted, and each The frame transfer function coefficient vectors are assembled into a two-dimensional matrix. Use two-dimensional compression (such as two-dimensional DCT transformation, principal component analysis, sparse coding, etc.), run-length coding, and entropy coding to compress the coefficients in the two-dimensional matrix to generate side information, and at the same time form a bit stream with the downmix signal.

[0035] 1. Add and downmix module

[0036] The input of this module is a two-channel time-domain signal, and the output is a d...

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Abstract

The invention discloses a parameter stereo coding, decoding method based on inter-channel transfer function. The parameter stereo coding, decoding method is characterized in that 1) a lower mixed signal can be generated by a coding end using a left track signal and a right track signal; 2) after the respective framing of the input lower mixed signal and the single track signal, the inter-channel transfer function coefficient of every frame can be extracted, and then the extracted transfer function coefficients can be used to form a two-dimensional matrix, and in addition, the single track signal can be the left track signal or the right track signal; 3) the two-dimensional compression, the run coding, and the entropy coding of the two-dimensional matrix can be carried out sequentially, and the coefficients of the two-dimensional matrix can be compressed to form the side information, and then the side information and the lower mixed signal can be used to form the bit stream. The lower high-power space information of the signals can be retained, and the inner-frame compression and the inter-frame compression can be realized at the same time.

Description

technical field [0001] The invention belongs to the field of multi-channel audio compression, and relates to a parametric stereo encoding and decoding method. Background technique [0002] Digital audio codec technology uses computer technology to process audio signals, which is convenient for recording and transmission, and has a wide range of uses. With the popularity of 3D movies, 3D games and home theaters, multi-channel audio codec technology has become a hot research topic. [0003] The reason why audio files can be compressed is because of redundancy. Traditional compression algorithms mainly consider eliminating redundancy within channels. When inter-channel redundancy is not considered, the bit rate of multi-channel audio files is linear to the number of channels. Relationship, the increase in the number of channels will result in a double increase in the bit rate. Starting from MP3 in 1993, people gradually discovered that there is redundancy between channels and...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/008G10L19/04
CPCG10L19/008G10L19/04
Inventor 曲天书吴玺宏黄庆博
Owner PEKING UNIV
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