Acoustic Science and Technology, Vol.22, No.6, pp.437-438 (2001.6)

Feedback active noise control system based on H-infinity control

S.Adachi, M.Ogawa, A.Takahashi and H.Sano

Abstract

Feedback active noise control (FB-ANC) [1] can eliminate low-frequency noise below 300 Hz which substantially constitutes the road noise inside an automobile. An FB-ANC system is developed by first constructing a lower-order infinite impulse response (IIR) model for the acoustic transmission system, this model incorporates a loudspeaker, an acoustic field and a microphone.
A feedback controller is then developed by H-inf control based on the model. Digital control is implemented by a digital signal processor (DSP) and the effectiveness of the proposed FB-ANC system is verified through experiments.

Key words: Active noise control, Feedback control, Acoustic field, H-inf control