<< Chapter < Page
  From matlab and simulink to real     Page 3 / 3
Chapter >> Page >
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”.

Changing the Output Data Type

Joining the blocks

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

Joining the Blocks

Checking the dyadic analysis filter bank

Double click on the “Dyadic Analysis Filter Bank” block. The values of the Dyadic Analysis Filter Bank are shown below. You do not need to change them yet. Click on “OK”.

Checking the Dyadic Analysis Filter Bank

Checking the delay alignment

The delay alignment is shown below, with different delay times for the different frequencies.

Checking the Delay Alignment

Checking the soft threshold

The “Soft Threshold” sets the threshold below which noise is ignored for each of the four channels. Zero means no noise reduction.

Checking the Thresholds

Checking the dyadic synthesis

Double-click on the “Dyadic Synthesis Filter Bank”. There is no need to change the values at this time. Click on “OK” when done.

Checking the Dyadic Synthesis Filter Bank

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

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 under Code Composer Studio

Different settings on the c6713 dsk

Microphone straight through to loudspeakers

To check out the microphone and loudspeakers, set the DIP switches on the C6713 DSK as follows:

Switch Position 0

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

Switch position for wavelet noise reduction

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

Switch Position 1 for Wavelet Noise Reduction

Modifying the model

The next stage is to modify the model. We will change the wavelet type to “Symlets”.

Changing the filter type

Double-click on the “Dyadic Analysis Filter Bank” block. Change the “Filter” field to “Symlets”. Click on “OK”.

Dyadic Analysis Filter Bank set to Symlets

Updating the dyadic synthesis filter bank

The wavelet type should be the same as that used in the Dyadic Analysis Filter Bank. Double-click on the “Dyadic Synthesis Filter Bank” block. Change the “Filter” field to “Symlets”. Click on “OK”.

Configuring the Dyadic Synthesis Filter Bank

Building the model

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

Building the Model

Running the updated model

Run the updated model and listen to the effect of using different filter types.

Some things to try

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

Change the wavelet types

Inside the “Dyadic Analysis Filter Bank” are different wavelet types. Which are suitable for wavelet denoising and which are not? Note: you will also have to alter the values used in the “Dyadic Synthesis Filter Bank”.

Available Wavelet Types

Change the delay alignment times

Experiment with the delay alignment times. Try higher and lower values.

What is the effect of completely removing the “Delay Alignment” block?

Change the noise reduction thresholds

In the “Soft Threshold” block, change the values. The existing vector of [3, 2, 1, 0] reduces high frequency noise, but does not affect low frequencies.

Create your own subsystem

Add your own subsystem block controlled by the DIP switches and add your own wavelet denoising algorithm. Choose your own wavelet, number of channels, sampling frequency and thresholds.

Questions & Answers

a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
Kim
y=10×
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
is it 3×y ?
Joan Reply
J, combine like terms 7x-4y
Bridget Reply
im not good at math so would this help me
Rachael Reply
how did I we'll learn this
Noor Reply
f(x)= 2|x+5| find f(-6)
Prince Reply
f(n)= 2n + 1
Samantha Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!





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
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'From matlab and simulink to real-time with ti dsp's' conversation and receive update notifications?

Ask