Combined feedback-feedforward active control of sound in a room Academic Article uri icon


  • This paper presents an active noise control system with a combined feedback–feedforward configuration, which may be useful when the location and directivity of the primary source in a room are not known. Using the combined system, the need to choose between a feedforward or a feedback system configuration beforehand is avoided. The optimum performance of feedforward, feedback, and the combined active control systems have been calculated from measurements taken in a 7× 6× 3 m 3 room with various primary source positions. Internal model control (IMC) together with optimal Wiener filtering are used in the design of the optimum controllers, which was performed for each primary source position and also included robust stability to guarantee the stability of the controllers in face of plant uncertainty. The performance of the feedforward controller alone was much more …

publication date

  • January 1, 1998