Active noise control using a distributed mode flat panel loudspeaker

H. Zhu, R. Rajamani, J. Dudney, K. A. Stelson

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


A flat panel distributed mode loudspeaker (DML) has many advantages over traditional cone speakers in terms of its weight, size, and durability. However, its frequency response is uneven and complex, thus bringing its suitability for active noise control (ANC) under question. This paper presents experimental results demonstrating the effective use of panel DML speakers in an ANC application. Both feedback and feedforward control techniques are considered. Effective feedback control with a flat panel speaker could open up a whole range of new noise control applications and has many advantages over feedforward control. The paper develops a new control algorithm to attenuate tonal noise of a known frequency by feedback control. However, due to the uneven response of the speakers, feedback control is found to be only moderately effective even for this narrow-band application. Feedforward control proves to be most capable for the flat panel speaker. Using feedforward control, the sound pressure level can be significantly reduced in close proximity to an error microphone. The paper demonstrates an interesting application of the flat panel in which the panel is placed in the path of sound and effectively used to block sound transmission using feedforward control. This is a new approach to active noise control enabled by the use of flat panels and can be used to prevent sound from entering into an enclosure in the first place rather than the traditional approach of attempting to cancel sound after it enters the enclosure.

Original languageEnglish (US)
Pages (from-to)475-484
Number of pages10
JournalISA Transactions
Issue number3
StatePublished - Jul 2003

Bibliographical note

Funding Information:
This project was partially funded by Thermok-ing, Inc, Minneapolis, MN 55420. The actuators for the panel speakers were provided by Kodel, Inc., Schaumburg, IL 60193. The authors would like to express their appreciation to Steve Gleason and Jeff Berge from Thermoking and Mike Delazzer from Kodel.


  • Active noise control
  • Distributed mode speaker
  • Feedback
  • Feedforward
  • Flat panel speaker


Dive into the research topics of 'Active noise control using a distributed mode flat panel loudspeaker'. Together they form a unique fingerprint.

Cite this