Audio object coding and decoding method based on high-and-low frequency domain resolution switching

Abstract

The invention provides an audio object coding and decoding method based on high-and-low frequency domain resolution switching. According to the coding end, a plurality of input audio object signals are firstly transformed from a time domain to a frequency domain through a preprocessing module. The transformed audio object signals are mixed on one hand to obtain a single-track mixed signal and on the other hand are subjected to object signal activeness detection on the basis of a low-frequency domain resolution sub-band and are used for extracting parameters together with the mixed signal, wherein parameter extraction is carried out on the basis of the high-frequency or low-frequency domain resolution according to the activeness of the object signal. Finally, the mixed signal, an activenessexpression matrix and object parameters extracted based on the high-frequency or low-frequency domain resolution are synthesized into a code stream. According to the decoding end, firstly, the code stream is decomposed to obtain the mixed signal, the activeness expression matrix and the object parameters; and then, under guidance of the activeness matrix, audio object signal reconstruction is carried out by using the mixed signal and the object parameters. The method provided by the invention provides a better solution for simultaneous high-quality coding of multiple audio objects.

Description

technical field [0001] The invention relates to the field of digital audio signal processing, relates to audio object coding, in particular to high-quality compression coding of audio objects with multiple frequency domain resolutions. Background technique [0002] Based on the theoretical basis of spatial audio hearing, audio coding technology has developed from traditional mono and stereo coding technology to more immersive multi-channel audio coding technology, realizing the coding and reconstruction of three-dimensional audio scenes. However, traditional 3D audio is channel-based and cannot adapt to non-standard and diverse playback environments, nor can it meet the user's needs for individual audio object tracks and personalized reconstruction of audio scenes. Audio object-based audio coding technology can encode and transmit multiple independent audio objects, so as to ensure the flexibility, accuracy and personalized needs of audio object reconstruction, so object-bas...

AI Technical Summary

Problems solved by technology

[0009] In order to solve the technical problems existing in existing audio object coding methods, the present invention proposes an audio object coding method that can comprehensively improve the coding quality of audio object signals without significantly increasing the coding bit rate, and can be applied in streaming media environments. decoding method

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