As noise signals are micro-pressure signals

external electromagnetic interference is easily superimposed on the noise signals

leading to abnormal output of the noise sensor during operation.To address this issue

the abnormal output of the noise sensor in electromagnetic interference environments is analyzed and studied

and the sensitive frequency range for abnormal output is determined to be 80~200MHz.An inductor-capacitor(LC)filter circuit composed of a common-mode inductor and a capacitor is proposed to eliminate electromagnetic interference in the sensitive frequency range.The effectiveness of the filter circuit design is verified through experiments

which improves the measurement accuracy of the noise sensor.