The invention discloses a multi-channel
digital audio mixing method and
system for an
online video conference, and the method comprises the steps: calculating the audio energy of a current frame in each channel of audio
stream, and storing the audio energy in an audio energy sequence; acquiring position coordinates of face key points from a video picture corresponding to a current frame of each path of audio
stream, calculating a pronunciation action value of the current frame, and storing the pronunciation action value in a pronunciation action value sequence; calculating a speech evaluation value of the current frame in each path of audio
stream according to the audio energy sequence and the pronunciation action value sequence; calculating the conference participation degree of the current frame in each path of audio stream according to the speaking evaluation value of the current frame; and calculating an audio
attenuation coefficient of the current frame in each path of audio stream according to the conference participation degree, the speaking evaluation value and the
time domain sampling amplitude of the current frame, and outputting
audio mixing data according to the audio
attenuation coefficient. The invention relates to the technical field of video conferences and
audio synthesis, and can effectively eliminate audio overflow, reduce volume attenuation and reduce environmental sound interference without influencing the audio of a main spokesman when multi-channel
digital audio signals of a conference are mixed.