A kind of mixing method, device, medium and equipment of lc3 audio code stream

Abstract

The invention discloses a method for mixing LC3 audio code streams. Multiple LC3 audio code streams are respectively subjected to partial steps in LC3 decoding to obtain audio spectral coefficients of the current frame, and the audio spectral coefficients of the current frame are superimposed to obtain the current frame. Mixed audio spectral coefficients; use the mixed audio spectral coefficients of the current frame to perform some steps in LC3 encoding, and set pitch delay parameters to obtain mixed LC3 audio streams. Part of the steps in LC3 decoding include code stream analysis, arithmetic and residual decoding, noise filling, global gain, time-domain noise shaping decoding, and transform-domain noise shaping decoding; part of the steps in LC3 encoding include transform-domain noise shaping coding, time Domain noise shaping coding, quantization, noise level estimation, arithmetic and residual coding, and codestream encapsulation. The application of the present invention reduces the total computing power demand in the audio mixing server, reduces the computation load in the encoding and decoding process, saves power consumption, lowers the cost, and ensures that the voice quality will not be reduced.

Description

technical field [0001] The present application relates to the technical field of Bluetooth audio coding and decoding, in particular to a method, device, medium and equipment for mixing LC3 audio code streams. Background technique [0002] With the large-scale commercial use of the LC3 codec, it has been widely used in conference calls. There are usually two ways of mixing conference calls: centralized and distributed. For centralized mixing, the complete audio stream buffering, decoding, mixing and encoding needs to be completed on the central mixing server. As the number of participants in the conference increases , the computing power requirements of the central mixing server also increase accordingly. Regardless of whether it is a distributed mixing system or a centralized mixing system, in order to support more mixing channels, it is necessary to configure a mixing server with stronger computing power, which increases the cost of conference equipment. Moreover, complet...

AI Technical Summary

Problems solved by technology

Whether it is a distributed mixing system or a centralized mixing system, in order to support more mixing channels, it is necessary to configure a mixing server with stronger computing power, which increases the cost of conference equipment

Moreover, complete decoding and encoding are carried out in the above processing, and the low-delay modified discrete cosine transform step and the low-delay modified inverse discrete cosine transform step usually use fixed-point operations, which will result in loss of precision due to the limitation of the word length. , thereby degrading the sound quality

Images