Working control method for earphone noise reduction and audio processor in terminal device

The invention provides a working control method for earphone noise reduction and an audio processor in a terminal device. Pins in a USB Type C interface are multiplexed, when the scheme provided by the invention is implemented, switch modules corresponding to the pins in the USB Type C interface are switched to ensure that the normal functions of the pins in the USB Type C interface are not influenced, a DMIC module in the terminal device is connected with a noise reduction microphone in an earphone by the pins in the USB Type C interface, in order to receive a noise reduction signal sent by the microphone through the DMIC module in the terminal device to realize the noise reduction processing of the terminal device on the earphone, and no additional audio processing chip or power supply needs to be added in the earphone, thereby effectively reducing the cost of the earphone, reducing the size and the weight of the earphone and effectively improving the user experience.