An adaptive-control-based noise cancellation approach

The authors outline a single (two-) microphone design of an ANC (adaptive noise cancellation) system that avoids prediction of colored noise, thus achieving the optimal prediction residual that is theoretically achievable. The design forces the colored acoustic noise to its inaccessible white generating sequence. The system, which is less sensitive to parameter estimation errors than previous approaches, is easily extended to an array of cancellation speakers. Computer simulation results using actually recorded machine noise are presented to illustrate (simulated) system performance. Parameter sensitive analysis shows that the present design is far less sensitive to identification than are deterministic designs