Noise reduction system and noise reduction method

A noise reduction system is used for an electronic device. The electronic device comprises a shell. The noise reduction system comprises a first microphone, a second microphone and a processor circuit. The first microphone and the second microphone are arranged in the shell. The first microphone is used for generating a first sound signal. The second microphone is remote from the shell relative tothe first microphone. The second microphone is used for generating a second sound signal. The processor circuit is coupled to the first microphone and the second microphone. The processor circuit receives a first sound signal from the first microphone and a second sound signal from the second microphone. The processor circuit is configured to calculate a difference between the first sound signaland the second sound signal to obtain an equalized gain, and adjust the first sound signal according to the equalized gain to generate a third sound signal. In addition, the invention further providesa noise reduction method.