| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain an electroacoustic transducer which can change volume of an air chamber accurately corresponding to a sound pressure variation in the air chamber which varies due to oscillation of a diaphragm of an electroacoustic conversion unit, and can precisely control acoustic impedance of the air chamber. <P>SOLUTION: An electroacoustic transducer includes an electroacoustic conversion unit 11 provided with a diaphragm which receives and oscillates a sound wave emitted from a sound source, and converts the sound wave into a sound signal, or a diaphragm which is driven by a sound signal to oscillate, and generates sound; and an air chamber 15 having the diaphragm of the electroacoustic conversion unit 11 disposed thereon, and volume of which is being changed due to the oscillation of the diaphragm. The air chamber 15 includes a sound pressure detection member 16 which detects sound pressure within the air chamber 15; and a volume adjustor which is driven by output signal of the sound pressure detection member 16, and changes the volume of the air chamber 15 in accordance with the output signal to control acoustic impedance of the air chamber 15. <P>COPYRIGHT: (C)2012,JPO&INPIT |
