| 摘要 |
PURPOSE:To realize the speaker system for a noise canceller capable of obtaining a certain silencing effect regardless of dispersion of the individual performance of the speaker or aging change. CONSTITUTION:The speaker system for noise canceller silencing noise by generating a sound of an inverse phase from the speaker based on data prepared in advance corresponding to the characteristic of noise from a sound source is featured to be provided with impedance characteristic detection means 6, 7 detecting the impedance characteristic of the speaker and a sound pressure control means 5 generating the sound signal of an inverse phase, referring to the impedance characteristic detected by the impedance characteristic detection means to detect the phase and amplitude of a diaphragm of the speaker and controlling the sound signal of the inverse phase based on the difference between the initial phase and amplitude and detected phase and amplitude. |
