Audio conference safe secrecy system and method using echo cancellation function

The invention discloses an audio conference safe secrecy system and method using an echo cancellation function. The system is composed of a control system and a meeting place system. The control system is composed of a processor, a multi-path headset distributor, a conference system master controller and a multi-path audio power amplifier. The meeting place system is composed of a loudspeaker box, a headset and a microphone. The processor is provided with two sound cards and audio conference safe secrecy software, wherein the first sound card has the echo cancellation function. The software is composed of a noise playing module, an audio processing module and a pure voice output module. The method includes the steps that the audio conference safe secrecy software plays noise and collects and transmits voice with noises to the first sound card for echo cancellation and noise reduction, and the audio processing module removes residual noise of voice signals subjected to echo cancellation and noise reduction. The audio conference safe secrecy system and method resolve the problems that the anti-eavesdrop measure of anti-eavesdrop equipment is simplex, and the spreading range of sound waves is not controllable, and can effectively guarantee that the conference content is not eavesdropped and communication is not affected.