Active adaptive noise cancellation with a feedforward open headset
Keywords:Adaptive control systems, Algorithms, Headphones, Active adaptive noise cancellation, Feedforward open headsets
AbstractActive noise-reduction headsets currently on the market use feedback-type controllers. This choice of configuration results in the active control of only low-frequency harmonics (usually under 1000 Hz). Moreover, no discrimination is made by feedback algorithms and any predictable acoustic signal, within the control band, is attenuated. Consequently, in addition to cancel the noise, the feedback-type headset will affect speech, alarms and other predictable useful signals, resulting in a discomfort sensation for the user. Also, in order to allow those headsets to attenuate higher frequencies, they are often combined with a passive attenuation shell, with consequence that the user does not hear any useful signal and has almost the feeling of being deaf. A solution to this problem is to use a feedforward controller instead of a feedback controller, thus allowing the headset to: Actively cancel high frequency components of a harmonic disturbance, Cancel only the disturbance without modifying useful signals, and Be light and comfortable (the headset can be of open type, since no passive attenuation is required).
How to Cite
Copyright on articles is held by the author(s). The corresponding author has the right to grant on behalf of all authors and does grant on behalf of all authors, a worldwide exclusive licence (or non-exclusive license for government employees) to the Publishers and its licensees in perpetuity, in all forms, formats and media (whether known now or created in the future)
i) to publish, reproduce, distribute, display and store the Contribution;
ii) to translate the Contribution into other languages, create adaptations, reprints, include within collections and create summaries, extracts and/or, abstracts of the Contribution;
iii) to exploit all subsidiary rights in the Contribution,
iv) to provide the inclusion of electronic links from the Contribution to third party material where-ever it may be located;
v) to licence any third party to do any or all of the above.