| Publication: G.J. Pan, A.J. Brammer, R.A. Goubran, J. Ryan and J. Zera "Broad-Band Active Noise Reduction in Communication Headsets by Digital Feedforward Control. |
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Abstract:
Communication headsets are frequently required to operate in environments in which acoustic noise interferes with the intelligibility of speech. The noise reduction obtained using conventional acoustic devices, which usually consist of an earphone mounted in a circumaural hearing protector, is known to be insufficient for some applications at low frequencies. For this reason, "active" noise reduction (ANR), in which a corrective sound is generated electro-acoustically to reduce the combined sound field at a desired location, has been proposed as a technique for reducing the noise at the ears [1,2].
The purpose of the present work is to explore the performance obtainable with a digital ANR system for such applications, based on the use of a circumaural headset and a floating-point digital signal processor (DSP). This paper reports our initial results. |