Active Noise Attenuation Using Lqg/ltr Control

Abstract

This paper presents a control system design for active noise cancellation using “Linear Quadratic Gaussian / Loop Transfer Recovery” (LQG/LTR). An implementation by an equipment like a headset is proposed, where both active and passive attenuation techniques are used. In this paper, the active technique is applied to attenuate low-frequency acoustic noise. The design objective is not only the active attenuation of acoustic noise, but also the sound audition at frequency band of the human voice. Results obtained from digital simulations are presented, which is considering the existence of a noise in the environment located near the turbine in a hydroelectric plant. In this noisy environment, the noise is attenuated and the equipment allows the user to hear human voices.

Keywords

• active noise control
• lqg/ltr control
• stability robustness