| 摘要 |
<p>PURPOSE:To easily suppress a noise by detecting a sound pressure in the cavity of a sound wave made resonate with a microphone arranged in the cavity of the resonator and canceling an incoming sound with the emission of an opposite-phase sound wave from a speaker. CONSTITUTION:The microphone is arranged in the cavity of the resonator, and the output of the microphone generated by the sound pressure in the cavity of the resonating sound wave is increased by an amplifier, and it is emitted from the speaker at an opposite phase. By adjusting the position relation among a noise source, the resonator and the speaker, and a gain, the sound with the same degree on intensity as the sound pressure of the arriving sound and with the opposite phase can be emitted in a wide range, and the sound pressure of the arriving sound can be offset with the emitted sound from the speaker at least in the range. Thus, the noise can be easily suppressed.</p> |
