Active noise cancellation in ducts using internal model-based control algorithms

Jwu-Sheng Hu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


A feedback control algorithm based on the internal model principle is proposed to solve the active noise control (ANC) problem in ducts. Because of its infinite open-loop gain at selected frequencies, the controller is able, at the cancellation speaker position, to block noise transmission of these frequencies. In other words, the speaker acts like a totally reflective boundary. Stability analysis of the closed-loop system is performed using the Nyquist criterion. Experimental results confirm the theoretical analysis, showing an average noise level reduction of 30 to 40 dB at the target frequencies.

Original languageEnglish
Pages (from-to)163-170
Number of pages8
JournalIEEE Transactions on Control Systems Technology
Issue number2
StatePublished - 1 Dec 1996

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