AbstractThe characteristics of a microphone are affected by the pressure and composition of the ambient gas. This paper presents a numerical simulation of the microphone within nitrogen gas with various pressures up to 48 atm. The simulation was carried out both for the deflection (static deflection) of the membrane by the polarization voltage and for the vibration (dynamic deflection) of the membrane by the incident acoustic pressure. In these cases, the physical constants of the gas, the location of the hole on the back plate and the gas flow between the back plate with a hole and the membrane were considered. The case also was considered in which the location of the hole is axially nonsymmetric. It was found that the membrane vibration derived by simulation corresponds well with the experimental result on the actual microphone as reported previously. From these simulations, the sensitivity frequency response of the condenser microphone under a high‐gas‐pressure environment were better underst