| 摘要 |
PROBLEM TO BE SOLVED: To provide a sound absorber capable of ensuring reliability thereof. SOLUTION: A noise detector, a sound absorbent deviation detector and a sound wave generator are respectively constituted of four sound detectors 8a-8d, sound absorbent deviation detectors 5a-5d and speakers 6a-6d. Average outputs x' and e' are calculated by operation amplifiers 4 and 2 from outputs of the noise detectors 8a-8d and sound absorbent deviation detectors 5a-5d, and a sound absorbent signal y is formed on the basis of them. Sound absorbent signals are respectively supplied to the speakers 6a-6d connected in parallel through a power amplifier 3. By the constitution, since the noise detector, sound absorbent deviation detector and sound wave generator are respectively constituted of a plurality of devices, even in the case there are troubles in any of them, function of the whole device can not be impaired, and reliability of the device can be ensured accordingly. |
