tailieunhanh - Adaptive Filtering Applications Part 4

Tham khảo tài liệu 'adaptive filtering applications part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Active Noise Cancellation The Unwanted Signal and the Hybrid Solution 81 Fig. 43. MSE with snoring reference signal Hybrid System Neutralization Change in secondary path An important characteristic of ANC systems is that they must be capable of secondary path online modeling which is observed in the graphs 44. There is an abrupt secondary path change in the thousandth iteration - taken from Lopez-Caudana et al 2008 - which does not causes the behavior of either system to destabilize when the values for a new secondary path appear. Fig. 44. MSE with 4 tones reference signal Hybrid System Neutralization Active Noise Cancellation The Unwanted Signal and the Hybrid Solution 83 to accurately individualize the parameters to achieve the desired response. However difficult this may not be impossible to do so there is still a lot of work to be done with hybrid ANC systems. 6. Acknowledgement The contributions of several students from Communications and Electronic Engineering from Tecnologico de Monterrey Mexico City Campus are gratefully acknowledged and the guidance from Dr. Hector Perez-Meana from IPN SEPI ESIME CULHUACAN. This work has been supported by Mechatronic s Department of the Engineering and Architecture School from Tecnologico de Monterrey Mexico City Campus. 7. References Akthar Muhammad Tahir Masahide Abe and Masayuki Kawamata 2004 . Modified-filtered-x LMS algorithm based active noise control system with improved online secondary-path modeling in Proc. IEEE 2004 Int. Mid. Symp. Circuits Systems MWSCAS2004 Hiroshima Japan Jul. 25-28 2004 pp. I-13-I-16 2004. Akhtar . Abe M. Kawamata M. 2006 . A new variable step size LMS algorithmbased method for improved online secondary path modeling in active noise control systems . IEEE Transactions on Audio Speech and Language Processing Volume 14 Issue 2 March 2006 Page s 720 - 726. Akhtar et al. 2007 Muhammad Tahir Akhtar M. Tufail Masahide Abe y Masayuki Kawamata. Acoustic feedback neutralization in active .