Sound mixing method and device of LC3 audio code stream, medium and equipment

Abstract

The invention discloses a sound mixing method of an LC3 audio code stream, which comprises the following steps of: respectively carrying out partial steps in LC3 decoding on multiple paths of LC3 audio code streams to obtain a current frame audio spectrum coefficient, and obtaining a current frame mixed audio spectrum coefficient according to the current frame audio spectrum coefficient; and carrying out partial steps in LC3 coding by using the current frame mixed audio spectral coefficient, and setting a fundamental tone delay parameter to obtain a mixed LC3 audio code stream. The partial steps in LC3 decoding comprise code stream analysis, arithmetic and residual decoding, noise filling, global gain, time domain noise shaping decoding and transform domain noise shaping decoding; the partial steps in LC3 coding comprise transform domain noise shaping coding, time domain noise shaping coding, quantization, noise level estimation, arithmetic and residual coding and code stream packaging. The application of the invention reduces the total computing power demand in an audio mixing server, reduces the operand in the encoding and decoding process, saves the power consumption, reduces the cost, and ensures that the voice quality is not 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