Many of the noise in ducts, such as air intake noise of vehicles, contain single or multiple large periodic and broadband random noise. Generally, such air intake noise is reduced with multiple resonators that require large-sized area. There are many applications of ANC with Filtered-X LMS algorithm for ductlike structures. However, if the target noise contains very large periodic component, it is difficult to reduce the broadband random noise sufficiently by ANC. In this study, we suggest to apply a new system, namely "hybrid ANC system", in which a Helmholtz resonator is utilized. In the application to the duct noise containing single or multiple periodic components, it was found that hybrid ANC can reduce both of the periodic and broadband random noise more effectively than any conventional ANC system.
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