Active noise control system using FxLMS algorithm

Implementation of FxLMS algorithm for a single channel feed-forward active noise control system.

Description

This simple simulation shows the implementation of FxLMS algorithm for a single channel feed-forward active noise control system. Here, the controller generates an "anti-noise" signal to result a destructive interference at the sensor position. The objective is to minimize the noise residue.

The process comprises of two tasks: the "off-line" identification of the secondary propagation path that stays between the actuator and sensor; and the "on-line" control, in which the parameters of the controller are adjusted.

Similar to my previous code, "BEM Code for 2D Pulsating Cylinder", I use only simple programming technique and basic commands. Function "filter()" can be substitute with convolution routine, i.e., y=h(k)*s(k). A brief explanation on the system and line by line comments are provided.

• MATLAB release: MATLAB 5.3.1 (R11.1)

[Uspana Ombre]

I never thought that the idea is so simple. Nice work, thank you.

[Damilola Sadiq O.]

Thanks a lot for this. I was especially looking for an ordinary LMS implementation without using the MatLab functions - which you've done quite easily. The code is also well written and commented. Thanks again.

[lior]

 

[Tanyer Alan]

 

[Agustinus Oey]

Thank you for your comments. As my appreciation for your kind encouragements, I am now preparing another, more elaborate, FxLMS example. Please wait for a couple of weeks. I wish you all the very best.

[Partha Ghosh]

I don't want simulation any more! Do any one here have any program which creates and cancels at least a single pure tone? ( u require a microphone to pickup error signal and two speakers to produce noise and anti noise. u have all of them in a PC.)