This paper presents the results of research of active control of noise. The authors built a prototype to lower the direct field of a known source using a linear array of 40 loudspeakers controlled by delay lines and a digital signal processor. The inspiring theoretical tool is wave field synthesis (WFS), an holographic approach to sound control, which was proposed by Berkhout, et al., in 1988, at the Delft University of Technology. An average reduction of 3 dB was obtained on an area of 16-square meters for a frequency of 1000 Hz.:

Authors: Zanolin, Michele; Podini, Paolo; Farina, Angelo; De Stabile, Stefano; Vezzoni, Paolo
Affiliations: Massachusetts Institute of Technology,Cambridge, MA ; Physics Department, University of Parma, Italy ; Acoustic consultant, Gamma Engineering, Reggio Emilia, Italy ; Industrial Engineering Department, Area delle scienze, Parma ,Italy(See document for exact affiliation information.)
AES Convention: 108 (February 2000) Paper Number: 5092
Publication Date: February 1, 2000
Subject: Audio Measurement and Instrumentation

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