A three-dimensional audio multi-channel grouping clustering coding method and system
A technology of three-dimensional audio and coding method, which is applied in the field of three-dimensional audio multi-channel grouping clustering coding method and system, and can solve problems such as complex channel association, complex channel content, and large number of channels
Active Publication Date: 2018-02-02
SHENZHEN RES INST OF WUHAN UNIVERISTY
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In the 3D audio environment, the number of channels is large, the content of the channels is complex, and the relationship between channels is complicated
The existing three-dimensional multi-channel parameter coding is mainly based on fixed speaker grouping or grouping and clustering of speakers based on energy level, extracting the spatial parameter information of the sound image, and considering the inter-channel correlation of three-dimensional audio in the simplest way, grouping The method lacks theoretical guidance and cannot fully reveal the spatial clustering of 3D audio signals. The effect of signal de-redundancy in 3D audio is reduced, and the downmixing of unrelated channels will also lead to information aliasing
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[0037] The 3D audio multi-channel group clustering encoding method and system provided by the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0038] During specific implementation, the system provided by the present invention can be realized by using computer software modularization technology. see figure 1 , the present invention provides a kind of three-dimensional audio multi-channel group clustering coding method, and concrete steps comprise:
[0039] In step S1, preprocessing is performed on the N channel input signals, specifically including high-pass filtering and frame processing, and the input signal 101 is sent to the high-pass filter to filter out low-frequency signals below 50 Hz; read in 20 ms as a frame The sampling data is used as the current frame data; the audio signal S of the current frame of N channels is obtained 1 ,...,S N , that is, the subscript 1 of the audio signal 102 indicates t...
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The invention relates to a three-dimensional audio multichannel grouping and clustering coding method and a three-dimensional audio multichannel grouping and clustering coding system. By the characteristic that signal sub-band enveloping structures of the same group of loudspeakers of the same sound source are similar, a calculating method based on sub-band frequency point extreme value enveloping similarity is provided to perform dynamic three-dimensional audio grouping and down conversion, the grouping calculation complexity of the calculating method is far lower than that of the traditional channel correlation calculating method, but the accuracy of the calculating method is similar to that of the traditional channel correlation calculating method. Compared with the existing multichannel down-conversion coding method, the three-dimensional audio multichannel grouping and clustering coding method has the advantages that a plurality of loudspeakers which form a main sound image can be effectively grouped, the spatial position information of an actual sound image can be well described by spatial parameter information which is extracted by the grouping loudspeakers, and the problem of information aliasing caused by a fixed grouping parameter extracting method is solved.
Description
technical field [0001] The present invention relates to the technical field of audio coding, in particular to a three-dimensional audio multi-channel group clustering coding method and system. Background technique [0002] In the traditional stereo and surround sound coding methods, the channel involved in the downmix has a strong correlation with the signal, and parametric coding can provide a higher compression ratio and improve better sound quality at the same time. In the 3D audio environment, the number of channels is large, the content of the channels is complex, and the relationship between channels is complicated. The loudspeaker groups forming the same sound image have the strongest signal correlation, the loudspeaker grouping is not fixed, and the loudspeaker grouping is not fixed and depends on the principle of physical nearest neighbor. The existing three-dimensional multi-channel parameter coding is mainly based on fixed speaker grouping or grouping and cluster...
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IPC IPC(8): G10L19/008
Inventor 胡瑞敏张茂胜姚雪春王晓晨姜林涂卫平王松杨乘
Owner SHENZHEN RES INST OF WUHAN UNIVERISTY