| 摘要 |
PROBLEM TO BE SOLVED: To provide a microphone capable of changing the volume of an air chamber according to change of sound pressure of the air chamber which varies according to vibration of a diaphragm, and controlling impedance of the air chamber accurately.SOLUTION: A microphone comprises: a microphone unit 52 in which a diaphragm 53 vibrates with a sound wave from a sound source and the vibration of the diaphragm is converted into an audio signal; and an air chamber 56 which is formed behind the diaphragm 53 of the microphone unit 52 and whose volume varies according to the vibration of the diaphragm 53. The air chamber 56 includes: a sound pressure detection member 55 for detecting a sound pressure in the air chamber 56; and a volume adjuster 57 which is driven by an output signal from the sound pressure detection member 55 and varies the volume of the air chamber 56 according to the output signal so as to control an acoustic impedance in the air chamber 56. |
