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Wavelets can be used in a wide range of applications, one of which is noise reduction. This module shows a real-time implementation of a wavelet-based noise reduction in the DSK6713. A Simulink model is created for simulation, and afterwards used for DSP code generation.

Introduction

Wavelets can be used in a range of applications, one of which is noise reduction.

This laboratory shows how to design a model of Wavelet Noise Reduction using Simulink and run it on a Texas Instruments C6000 DSP.

Objectives

  • Design a model of Wavelet Noise Reduction for the Texas Instruments C6000 family of DSP devices using MATLAB® and Simulink®.
  • Modify an existing Simulink demonstration model.
  • Run the project on the Texas Instruments C6713 DSK with a microphone and computer loudspeakers / headphones.

Level

Intermediate. Assumes prior knowledge of MATLAB and Simulink. It also requires a theoretical understanding of wavelets and some knowledge of Texas Instruments DSPs.

Hardware and software requirements

This laboratory was originally developed using the following hardware and software:

  • MATLAB R2006b with Embedded Target for TI C6000.
  • Code Composer Studio (CCS) v3.1
  • Texas Instruments C6713 DSK hardware.
  • Microphone and computer loudspeakers / headphones.

Simulation

The Simulink model described here is based on a MATLAB Demo.

Opening the model

Open WaveletDenoising.mdl

Opening WaveletDenoising.mdl

Running the model

Run the model. The colors change to show the different filter channels. Green = high frequency.

Wavelet Model Showing Color Coding

Scope output

The scope output shows how the random noise has been separated out (Residual).

Scope Output

Monitoring the dyadic filter outputs

Add an extra scope as shown in Figure 4 to display the Diadic Filter Outputs.

Monitoring the Dyadic Filter Outputs

Analysis of diadic filter outputs

It can be seen that the noise is on Out1, Out2 and Out3. The clean input signal is on Out4.

Noise Levels at Dyadic Filter Outputs

Modifying the dead zone

Double-click on the “Soft Threshold” block. This is the actual noise reduction stage. The fields are in order Out1, Out2, Out3 and Out4.

Noise Levels at Dyadic Filter Outputs

Here Out1 has been given a threshold of 3. This means that only values>3 are let through.

Out2, Out3 and Out4 have been given the value of 0. This means the whole signal is let through.

The output is shown in Figure 6. Note that the noise associated with Out2 and Out3 have not been reduced.

Threshold only applied to Out1

Changing the delay alignment

Double-click on the “Delay Alignment” block. Temporarily remove the delays on Out1 and Out2.

Removing the Delay Alignments

Run the model to see the effect.

Summary of simulation

From practical experimentation using the Simulink model, you should now understand how wavelet denoising works.

Real-time model for ti c6713 dsk

Texas instruments c6713 dsk setup

Texas Instruments C6713 DSK Setup

Questions & Answers

what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
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 did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, From matlab and simulink to real-time with ti dsp's. OpenStax CNX. Jun 08, 2009 Download for free at http://cnx.org/content/col10713/1.1
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