NOISE CONTROL SYSTEM, FAN STRUCTURE EQUIPPED THEREWITH, AND OUTDOOR UNIT OF AIR CONDITIONER

摘要

To provide a noise control system capable of generating a noise cancellation field where noise is reduced at a desired position in a space. An error scanning filter 12 generates a noise cancellation signal using an adaptive control algorithm based on error scanning, the signal having a phase opposite to that of an acoustic signal component detected by a reference sensor. A control speaker 13 radiates the noise cancellation signal to create a noise cancellation field 60 near the head of a person 26 receiving sound.