Fully digital conference audio mixing apparatus and method

Abstract

The present invention discloses a fully digital conference audio mixing apparatus and method. Multi-channel audio data which are input is subjected to audio data preprocessing and then are sent to a summation module for summation, so as to obtain a multi-channel audio mixing digital sequence. After the multi-channel audio mixing digital sequence enters a gain adjustment module, the audio gain output is adjusted according to an adjustment factor parameter which is updated in real time. An overflow detection module detects whether overflow appears or not and feeds back an overflow flag to an adaptive adjustment factor calculation module. The adaptive adjustment factor calculation module calculates and updates adjustment factor parameters in real time according to the overflow flag value, and provides them to the gain adjustment module. Therefore, adaptive adjustment characteristics are achieved. The present invention realizes little noise, solves the problem of digital mixing overflow while retaining high sound quality, and has the benefits of high real-time capability and short delay.

Description

technical field [0001] The invention relates to the technical field of digital audio, in particular to an all-digital conference audio mixing device and method. Background technique [0002] In multi-channel audio transmission processing systems, especially in digital conference systems, it is often necessary to perform multi-channel audio mixing to mix the voices of multiple representative units into one voice output. At present, there is an all-digital conference audio mixing method It is to superimpose multi-channel input audio data. If overflow occurs, the clamping method is used. When overflow occurs, the value after clamping is the maximum value that can be represented. When underflow occurs, the value after clamping is The smallest value that can be represented. This method can only prevent overflow, but it will lead to clipping distortion, which will introduce a lot of noise, so that the mixing effect will directly affect the final audio output sound quality; anothe...

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Problems solved by technology

This method can only prevent overflow, but it will lead to clipping distortion, which will introduce a lot of noise, so that the mixing effect will directly affect the final audio output sound quality; another method is to average the multi-channel audio, although this method avoids The noise generated by the overflow will be greatly attenuated, but the useful audio signal will be greatly attenuated, thus affecting the normal voice communication of the useful signal

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