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Select View ->Library Browser ->Signal Processing Blockset ->Filtering->Adaptive Filters.

Highlight “Adaptive Filters”. Drag-and-drop the “LMS Filter” block onto the model.

Adding an LMS Filter Block

Setting the lms filter parameters

The most critical variable in an LMS filter is the “Step size (mu)”.

If “mu” is too small, the filter has very fine resolution, but reacts too slowly to the audio signal.

If “mu” is too great, the filter reacts very quickly, but the error also remains large.

We will start with 0.005.

Setting the Parameter “Set size (mu)”

Adding a delay

From the “Signal Processing Blockset”, highlight “Signal Operations”. Drag-and-drop the “Delay” Since we are working with frames, the delay from “Discrete Components” library will not work! block onto the model.

Adding a Delay

Setting the delay parameters

Because we are working with frames of 64 samples, it is convenient configure the delay using frames. Double-click on the “Delay” block.

Change the “Delay units” to Frames.

Set the “Delay (frames)” to 1. This makes the delay 64 samples.

Setting the Delay Size

Adding a dip switch and led

So we can hear the difference without LMS denoising and with LMS noise reduction, we will use a DIP switch of the DSK6713.

Adding a Switch and LED

Select View ->Library Browser ->Embedded Target for TI C6000 DSP. Highlight “DSK6713 Board Support”.

Drag-and-drop the “Switch” block onto the model. Also drag-and-drop the “LED” block onto the model.

Dip switch settings

The DIP switch needs to be configured. Double-click on the “Switch” block.

Select all the boxes and set “Data type” to Integer. The “Sample time” should also be set to “–1”.

Setting up the DIP Switch Values

Adding a constant, switch and relational operator

We now need to setup a way to switch between straight through without noise reduction and with LMS noise reduction.

Select View ->Library Browser ->Simulink. Highlight “Commonly Used Blocks”.

Drag-and-drop a “Constant” onto the model.

Drag-and-drop a “Switch” block onto the model.

Drag-and-drop a “Relational Operator” block onto the model.

Selecting the Commonly Used Blocks

Setting the constant value

The switch values lie between 0 and 15. We will use switch values 0 and 1. Double-click on the “Constant” block. Set the “Constant value” to 1 and the “Sample time” to “inf”.

Setting the Echo Delay Gain

Setting the constant data type

Click on the “Signal Data Types” tab. Set the “Output data type mode” to “int16”. This is compatible with the DAC on the DSK6713.

Data Type Conversion to 16-bit Integer

Setting the relational operator type

Double click on the “Relational Operator” block. Change the “Relational operator” to “==”. Click on the “Signal Data Types” tab.

Changing the Relational Operator

Setting the relational operator data type

Set the “Output data type mode” to “Boolean”. Click on “OK”.

Changing the Output Data Type

Joining the blocks

Move the blocks and join them as shown in the Figure below.

Joining the Blocks

Returning to the parent system

From the Toolbar, select the “Up Arrow” icon. This returns you to the next higher level.

Returning to the Parent System

Building the model

Selecting real-time workshop

Select Tools ->Real-Time Workshop ->Build Model.

Building the Model

Frames displayed on model

When built, the single lines are replaced by double lines. This shows frames.

Frames

The completed model running on code composer studio

From the folders on the left, select the source code for the project.

The Completed Model Running in Code Composer Studio

Different settings on the dsk6713

Microphone straight through to loudspeakers

To check out the microphone and loudspeakers, set the DIP switches on the DSK6713 as follows:

Switch Position 0

The microphone is fed directly to the loudspeakers. There is no LMS noise reduction.

Switch position for lms noise reduction

To run the “LMS Noise Reduction” subsystem, set the DIP switch to 1.

Switch Position 1 for LMS Noise Reduction

Some things to try

You may wish to experiment with different settings. Here are some suggestions.

Experiment with lms filter settings

Change the value of “Step size (mu)” between 0.0001 and 0.5. This is the critical value.

Low values of mu give good resolution, but a slow reaction time.

High values of mu give less resolution, but faster reaction times.

Find the best value of mu for noise reduction on the TI DSK6713.

Configuring the LMS Filter Block Parameter

Experiment with lms filter settings

Try different value of “Filter Length”. What is the minimum value that will allow the filter to work correctly?

Change from lms filter to rls filter

Inside the “Adaptive Filters” are different LMS types. Which are suitable for LMS denoising and which are not?

Available Adaptive Filter Types

Figure 40 –

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Questions & Answers

what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
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
How can I make nanorobot?
Lily
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
how can I make nanorobot?
Lily
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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