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Paper presented at the Recent Trends in Electrical, Electronics and Communications Engineering Conference at ITM Universe in January 2014
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Nirav Desai, Asst. Professor, Dept. of ECE, ITM Universe
Recent Trends in Electrical, Electronics and Communications Engineering Conference 2014
ITM Universe, Vadodara, Gujarat
Active Noise Cancellation by the modified filtered x-LMS algorithm with online secondary path modelling
Author: Nirav DesaiAsst. Professor,
Department of Electronics and Communications Engg.ITM Universe, Vadodara
(Affiliated to Gujarat Technological University)
Nirav Desai, Asst. Professor, Dept. of ECE, ITM Universe
Active Noise Cancellation: Problem Statement andSystem Development
Active Noise Cancellation: Problem Definition LMS approach to active noise cancellation
System diagram for slow adaptation
Nirav Desai, Asst. Professor, Dept. of ECE, ITM Universe
Classic Least Mean Square Algorithm
System identification using LMS Algorithm Design equations for LMS algorithm
[2] AdaptiveFilter Theory:
Book by Simon Haykin
Nirav Desai, Asst. Professor, Dept. of ECE, ITM Universe
Modified Least Mean Square Algorithm
Tap weight updates:
Nirav Desai, Asst. Professor, Dept. of ECE, ITM Universe
Modified filtered x-LMS with Online Secondary Path Modelling
FXLMS without modifications
Nirav Desai, Asst. Professor, Dept. of ECE, ITM Universe
Code Snippet for simulation on SCILAB
Nirav Desai, Asst. Professor, Dept. of ECE, ITM Universe
Extraction of channel statistics from available data
Nirav Desai, Asst. Professor, Dept. of ECE, ITM Universe
Estimation of channel model in 1st, 2nd and 3rd order
Nirav Desai, Asst. Professor, Dept. of ECE, ITM Universe
Estimation of noise signal by the FXLMS algorithm
Nirav Desai, Asst. Professor, Dept. of ECE, ITM Universe
Adaptive step size used by modified LMS algorithm
Nirav Desai, Asst. Professor, Dept. of ECE, ITM Universe
Mean square estimation error of noise by algorithm
Nirav Desai, Asst. Professor, Dept. of ECE, ITM Universe
Mean square estimation error w/o modification of FXLMS algorithm
Nirav Desai, Asst. Professor, Dept. of ECE, ITM Universe
Need better hardware such as a Texas Instruments DSP or ARM Cortex M3/M4 processorAdd output drivers, use active filters.
Condensor Mic
3mH inductor
Second order low pass filter
with 10uF Ceramic capacitors
Arduino UNOWith Atmel ATMEGA
MicrocontrollerHaving 8 bit
PWM audio out
Hardware setup for test of noise cancelling algorithm
[1] Active Noise Control: A Tutorial Review Sen M. Kuo and Dennis R. Morgan, Senior Member IEEE PROCEEDINGS OF THE IEEE, VOL. 87, NO. 6, JUNE 1999 [2] Adaptive Filter Theory by Simon Haykin [3] Active Noise Cancellation System using DSP Processor G.U.Priyanga, T.Sangeetha, P.Saranya, Mr.B.Prasad International Journal of Scientific & Engineering Research, Volume 4, Issue 4, April-2013
REFERENCES:
Nirav Desai, Asst. Professor, Dept. of ECE, ITM Universe
Thank you for your attention.Questions?
