Noise is an important consideration in both occupational and residential environments, with respect to comfort, communication, health and safety. Traditional methods of noise control incorporate "passive" techniques such as utilising sound absorbing and dampening materials, vibration isolators, or placing barriers between the noise source and observer. These methods however only prove successful at higher frequencies and while technically possible for lower frequencies they can become cumbersome, space intrusive and expensive.
With notable publications on the subject [1-6], the concept of introducing "anti noise", "cancelling noise" or "active noise control (ANC)", is becoming a viable complementary or alternative solution. While an old idea, technological advancements have recently allowed it to become a practical reality in an increasing number of applications. Notable