Method and system for improving SNR

The invention provides a method for improving the SNR. The method for improving the SNR includes the following steps that a main interface of a main CPU grasps a digital voice signal output by a codec; a main interface of an audio device receives a voice signal transmitted by the main interface of the main CPU; the main interface of the audio device transmits the voice signal to a microprocessor; the microprocessor carries out noise reduction on the voice signal and then converts the voice signal into an analog voice signal. The analog voice signal is played by a palyer. According to the method for improving the SNR, under the condition that hardware of a mobile phone is not changed, the microprocessor carries out noise reduction on the voice signal, affection brought by noise is eliminated and the communication quality is improved.