Patent ID: 8483399

Claim:
A condenser microphone in which a diaphragm and a backplate are disposed as two opposing electrodes inside a housing having an opening for admitting sound waves in a front surface, wherein an aeration hole is formed in a wall portion that blocks off a back surface of said housing; and a sound-absorbing filter having sound absorption characteristics with respect to a frequency band targeted for detection is disposed so as to entirely cover said opening or aeration hole in one of the front surface or back surface of said housing when the sound waves are admitted on a front surface and back surface of the housing, air vibrations of the frequency band targeted for detection are being cut on a surface of the diaphragm on a side that the sound-absorbing filter is disposed, while the air vibrations of the frequency band targeted for detection are not being cut on a surface of the diaphragm on a side that the sound-absorbing filter is not disposed; and air vibrations on the surfaces of the diaphragm other than air vibrations of the frequency band targeted for detection are canceled out, to thereby detect the air vibrations of the frequency band targeted for detection.