| 摘要 |
PURPOSE: To reduce noises being generated from the exhaust port side of the indoor machine of an air-conditioner package, by providing a stage for generating a signal with an inverse phase for a guide noise by specifying a parameter section code, synthesizing the signal with the inverse phase and a transfer function before amplification, and outputting and discharging a signal with the inverse phase for reducing the original noise. CONSTITUTION: A control unit of a control means detects noise state through a sensor 25 being provided at a noise source and forms each kind of noise parameter, transfer function, parameter, and the like into a database. A gain is adjusted according to the difference between a vibration signal and the database of a noise spectrum to obtain the transfer function. A signal where a parameter or the like is obtained by a sensor and is rotated, namely a control noise with an inverse phase difference for the generated noise, is discharged by upper and lower speakers 20 and 21 through an amplifier. Therefore, the energy of noise being discharged from an indoor machine is reduced and the noise is reduced according to a control noise source with an inverse phase being generated from the upper and lower speakers 20 and 21. As a result, a user can use equipment comfortably. |
