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Changing the Delay

Experiment with different values of delay to see how it effects the operation of the LMS Filter.

Changing the number of weights

Double-click on the “LMS Block” and change the Filter Size (number of Weights).

If the number of Weights is large, the algorithm will be slow to run.

If the number of Weights is too small, the filter will not remove the noise properly.

Changing the Filter Length

Summary

From practical experience, you should now know how to use LMS algorithm and how you can adjust the Step size (mu), the filter delay and the number of weights to obtain optimum performance.

You will now apply this to building a real-time model.

Real-time model

You have now run the simulation and understand the operation of the LMS Filter.

You will now implement the Real-Time Acoustic Noise Cancellation Model using the Texas Instrument C6713.

Texas instruments dsk6713 setup

Texas Instruments DSK6713 Setup

Alternatively, you can use computer loudspeakers.

Starting up code composer studio

Connecting the dsk6713

Start Code Composer Studio for DSK6713 and use Debug ->Connect

Startup Screen for Code Composer Studio (CCS)

Opening an existing model

Start MATLAB 7.3.0 R2006b:

Opening an Existing Demo

Click on “Demos”. The following screen will appear:

Selecting the Audio Demo Models

Highlight “Embedded Target for TI C6000 DSP” then “Audio”. Click on “Wavelet Denoising”. We are going to use this as our template.

Viewing the original model

The “Wavelet Denoising” model is now displayed.

Wavelet Denoising Parent

Saving the model

For convenience, save the model to the MATLAB “Work” directory, where most models are stored.

Saving the Model to the MATLAB “Work” directory

Changing the title

Delete the “Info” box. Change the title to “LMS Noise Reduction”. You may also wish to move the “DSK6713” icon to the left hand side.

LMS Noise Reduction Parent

The original wavelet noise reduction algorithm

Double-click on the “function()” box. The “Wavelet Noise Reduction Algorithm” model is now displayed.

Wavelet Denoising Algorithm

Delete blocks

Delete the blocks and connect the input directly to the output. Add a title.

LMS Denoising Algorithm Template

Overview of the lms model

We are going to implement the model shown below.

We will now update the empty model by dragging-and-dropping some library components onto the model.

Overview of the LMS Algorithm

Changing the input to microphone

Double-click on the blue box to the left marked “DSK6713 ADC”. The following screen will appear.

Setting up the ADC for Mono Microphone Input

Change the “ADC source” to “Mic In”.

If you have a quiet microphone, select “+20dB Mic gain boost”.

Set the “Sampling rate (Hz)” to “48 kHz”.

Set the “Samples per frame” to 64.

When done, click on “OK”.

Important: Make sure the “Stereo” box is empty.

The dac settings

The DAC settings need to match those of the ADC. Check that it uses the same sampling rates. Click on “OK”.

Setting the DAC Parameters

Adding an lms block

The Simulink block for LMS is to be found in the “Signal Processing Toolbox”.

Questions & Answers

what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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