Performance Comparison of FXRLS, FXAPA and FXLMS Active Noise Cancellation Algorithms on An FMRI Bore Test-Bed

Active Noise Control (ANC) Algorithms (FX-RLS, FX-APA and FX-LMS) are tested on an fMRI test-bed. Floating point DSP hardware with high sampling rates are used to ascertain the effectiveness of ANC in a real-time application containing high sound pressure levels (SPL). Secondary paths are also calculated and updated as necessary. The results presented use a realistic primary path of an fMRI bore simulated by a half cylindrical acrylic bore of 0.76 m (D) x 1.52 m (L). Detailed results of the performance of the ANC system are presented in the paper. The results were obtained by using an automated system, designed to systematically test any frequency range with high precision. Our experiments show that the LMS algorithm gives the best performance with good stability for single-tone noise but RLS algorithm shows better performance for fMRI noise.