Three-dimensional audio multichannel grouping and clustering coding method and three-dimensional audio multichannel grouping and clustering coding system

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.