Spatial audio parameters prediction coding and decoding methods of movable sound source and system

Abstract

The invention relates to the technical field of audio frequency, in particular relating to spatial audio parameters prediction coding and decoding methods of a movable sound source and a system. The coding method provided in the invention comprises: inputting multichannel audio frequency signals; extracting spatial audio parameters from the input multichannel audio frequency signals; predicting the spatial audio parameters in the current frame according to the speed of the movable sound source; obtaining the spatial audio parameter prediction coefficient and the spatial audio parameter prediction residual error of the current frame; and coding the spatial audio parameter prediction residual error of the current frame and obtaining a code stream. The decoding method provided in the invention comprises: inputting the code stream; decoding the code stream and obtaining the spatial audio parameter prediction residual error; and rebuilding the spatial audio parameters of the current frame according to the speed of the movable sound source and the spatial audio parameter prediction residual error of the current frame. The invention can predict accurately the spatial parameter variation of the movable sound source according to the Doppler effect, kinematic principle, geometrical acoustics principle and fluctuation acoustics principle, the prediction error is small, and the coding rateis effectively reduced.

Description

technical field [0001] The present invention relates to the field of audio technology, in particular to a mobile sound source spatial audio parameter prediction encoding and decoding method and system. Background technique [0002] The theoretical basis of spatial audio coding is the physiological and psychoacoustics of human ear spatial hearing. In 1983, Blauert et al. gave a mathematical-physical model and experimental analysis for the spatial localization of single and multiple sound sources of the human ear, and defined spatial clue parameters such as interaural time difference ITD, interaural intensity difference ILD, and interaural correlation IC. Among them, ITD and ILD respectively represent the time difference and intensity difference of the sound from the same sound source arriving at the left and right ears. These two parameters can be used to locate the position of the sound source. IC is the measure of the similarity of the sound entering the left and right ears...

AI Technical Summary

Problems solved by technology

This differential encoding method uses the spatial audio parameters of the previous frame as the predicted value of the current frame, and does not take into account the changes in the spatial audio parameters of moving sound sources, and there is still room for improvement.

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