Since the sound card driver of Shenzhou notebook is installed by default, the sound from the microphone is collected from time to time. The solution is as follows:

　1. Start》Control Panel》Sounds and Audio Devices》Advanced (V) , or double-click the gray speaker icon in the lower right corner to open the dialog box.

2. Click the options, properties, and mixer column in the upper left corner, select the realtek hd audio input or mic option, make the recording below optional, and select it.

3. Select the microphone, MIC and other options in the white box below. Click OK.

4. Check the corresponding "Select" column under the microphone and raise the volume to the top (maximum).

5. If your hand is close to the microphone, or the computer howls under other circumstances, please click Advanced Options and cancel Microphone Enhancement below the icon.