Voice conference audio mixing system and voice conference audio mixing method

Abstract

The invention discloses a voice conference audio mixing system and a voice conference audio mixing method. The voice conference audio mixing system comprises a conference audio mixing module. The conference audio mixing module comprises an input voice processing unit and an input voice audio mixing unit. The input voice processing unit is used to subtract input voice data acquired by a current frame of a voice input port of every participant by the input voice data acquired by the previous frame to acquire the input voice difference of the current frame of every participant. The input voice audio mixing unit is used for the successive superposition of every input voice difference of the current frame, and the new audio mixing value of the current frame of the participant is acquired after each superposition. The voice conference audio mixing system and the voice conference audio mixing method are advantageous in that the new input voice data input by every participant is subtracted by the voice data input by the previous frame, and a direct current component of an audio mixing result is effectively removed, and therefore distortion of conference voice signals is prevented; design is simple, occupied resources are less, and costs are low.

Description

technical field [0001] The invention relates to the technical field of voice conference communication, in particular to a voice conference sound mixing system and method. Background technique [0002] In the existing communication equipment, there are mainly two ways to realize the audio mixing function of the conference. One is to achieve sound mixing through CPU or DSP; the other is to achieve sound mixing through FPGA / CPLD. [0003] The advantage of implementing audio mixing through CPU or DSP is that more complex audio mixing control functions may be realized. However, when the audio mixing is realized by CPU or DSP, when the number of conference resource channels is the same, the processing of audio mixing needs to occupy the processing time of CPU or DSP. More conference audio mixing channels require CPU or DSP to process more More instructions require a stronger processor, resulting in a much higher cost than FPGA / CPLD. In addition, since it is difficult for the CP...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention proposes a voice conference sound mixing system and method. The system or method uses a difference mixing and summation algorithm, and completes the process by means of a time-division multiplexing pipeline on the FPGA / CPLD. The conference audio mixing function of dozens to tens of thousands of audio channels has a small delay, and can effectively remove the DC component of the input signal and improve the audio signal-to-noise ratio; on the premise of not reducing the audio mixing quality, it solves the complicated design of the existing technology , Occupying a lot of resources and high cost

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