Video fusion gateway based on digital video conference system

The utility model provides a video fusion gateway based on a digital video conference system, which is characterized in that a positive buffer circuit and a negative buffer circuit which are respectively used for carrying out buffer processing on an analog audio positive signal and an analog audio negative signal are arranged in an analog input buffer circuit; the analog audio positive signal and the analog negative signal are enabled to obtain relatively low noise and harmonic distortion, higher harmonic components in the audio signals are filtered out, and no noise is ensured in a communication process; a voltage stabilizing circuit for providing stable reference voltage for the positive buffer circuit and the negative buffer circuit is also arranged in the analog input buffer circuit, so that stable output of the positive buffer circuit and the negative buffer circuit can be ensured; a band-pass filter composed of a high-pass filter and a low-pass filter is arranged in the positive buffer circuit and used