Audio processing system and network camera

The utility model provides an audio processing system and a network camera. The system comprises a protection device, a first filtering device and a second filtering device which are sequentially connected, and the protection device comprises a protector connected with an audio input and output device and used for reducing electrostatic voltage in an input or output audio signal to a preset value; the first filtering device comprises a common-mode filtering module and a differential-mode filtering module, and the common-mode filtering module is connected with the protector and used for consuming noise energy in the audio signal and filtering common-mode interference; and the differential mode filtering module is connected with the common mode filtering module and is used for filtering differential mode interference. Based on this, the noise anti-interference problem of various tests is solved based on a concise protection filter circuit by means of'blocking 'and'thinning' modes for noise energy through reason