A network audio mixing processing method and device

Abstract

The invention discloses a network audio mixing processing method and device, relating to the technical field of audio processing, comprising: performing signed accumulation of audio data from various channels; segmentally compressing the accumulated audio data; and determining the attenuation factor of each segment; Obtain the mixed sound audio signal of output; Described mixed sound processing method adopts the method for segmental compression to carry out sound mixing, even if make computing efficiency high, also be easy to realize in the single-chip microcomputer; Observation by actual waveform, after drawing the sound mixing of this method, There is no overflow and top clipping phenomenon, but they are all compressed at the position close to the upper and lower limits, the volume is louder, the remaining intelligibility is high, and there is no obvious noise interference; the system used in the device of the present invention only needs to use ARMCortex TM ‑Single-chip microcomputer above the M4 architecture can realize the function; and use the existing LWIP protocol stack to enable the system to support the basic transmission protocol in TCP / IP; since only one single-chip microcomputer is required for processing, a block can be saved from the circuit FPGA, thereby saving costs.

Description

technical field [0001] The present invention relates to the technical field of audio processing, and in particular, to a method and device for processing network audio mixing. Background technique [0002] At present, the common sound mixing processing methods on the market all use the existing "normalized sound mixing". The advantages of this algorithm are that it is easy to understand and the operation expression is concise. However, the disadvantages are also obvious. It is necessary to use floating-point operation or expand the floating-point into shaping and then perform the operation, so it is difficult to use a single-chip microcomputer to complete the operation efficiency; and the mixing data at the current moment will be affected by the mixing data at the previous moment. In case of packet loss. [0003] In addition, in the industry, FPGA+MCU architecture is used for transmission in conference audio transmission. For example, Patent No. 201010593939.5 (a multimedi...

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Problems solved by technology

[0004] This method of transmission is stable, but the disadvantages are also obvious

[0005] (1) The cost is high, this is because the system uses dual chips, FPGA+SCM;

[0006] (2) The transmission protocol is inflexible, because the network audio part is processed by FPGA, and the logic of FPGA is poor, so the system does not have a complete TCP / IP protocol stack;

[0007] (3) The development time is long, and the FPGA and single-chip microcomputer need to be developed separately, and relevant agreements and long-term debugging need to be formulated between the two chips;

[0008] (4) There are many developers, and professional engineers with FPGA and single-chip microcomputer are needed to complete the design of the entire software; and when a problem occurs, one cannot handle and modify the software BUG alone

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