Active Noise Control as a Solution to Low Frequency Noise Problems

Abstract

The control of low frequency noise presents special problems which do not occur at higher frequencies. These problems relate mainly to the long wavelength at low frequencies, which leads to little absorption by conventional means, unless large quantities of absorbing material or large volumes of space are used. There are many examples of low frequency noise problems which can be solved by active attenuation, without the use of thick absorbing material. Some of these are given in this paper.