1. Home
  2. From matlab and simulink to real
  3. Signal processing and communication
  4. Signal to noise measurement

2.5 Signal to noise measurement

<< Chapter < Page
  From matlab and simulink to real     Page 1 / 2
Chapter >> Page >
This module describes the implementation af a Signal to Noise Measurement tool using the DSK6713. A Simulink simulation model is created, and used afterwards to generate real-time DSP code.

Introduction

The signal-to-noise ratio of an audio signal gives a measurement of the quality of that signal. Signal-to-Noise ratio can be measured in real-time using statistics.

This laboratory shows how to evaluate a model of Signal-to-Noise Ratio measurement using Simulink® and run it on a Texas Instruments C6000 DSP.

Objectives

  • Run the Simulink model of signal-to-noise ratio measurement on a PC, to determine the optimum parameter settings.
  • Modify the Simulink model for real-time measurement of signal-to-noise ratio using the Texas Instruments C6713 DSK.
  • 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 some understanding of statistics 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.

Related files

Simulation

Procedure

Opening the signaltonoise model

Start MATLAB 7.3.0 R2006b then open the SignalToNoise.mdl

Opening SignalToNoise Model

Viewing the signaltonoise parent

The SignalToNoise parent is now displayed. Double-click on the Algorithm box.

SignalToNoise Parent

Algorithm for signal-to-noise ratio measurement

The Signal-to-Noise Ratio algorithm is now displayed. Run the model.

Signal-to-Noise Ratio Algorithm

Output of the model

Run the model.

Algorithm Output

It will be seen that the output of the algorithm (“Unfiltered S/N”) varies from frame to frame. The next step is to fine-tune the algorithm parameters.

Tuning the simulink model

The model is run several times to determine the best values of the parameters:

  • To evaluate the algorithm accuracy for different frequencies
  • To determine the optimal frame length
  • To set the optimum delay time
  • To evaluate the effect of sampling frequency
  • To obtain a consistent algorithm output.

Evaluating the algorithm accuracy for different frequencies

Change the sine wave frequency from 500 Hz (default) to 1000 Hz then run the model several times. Make a note of the four different meter outputs (S/N Ratio from RMS Signals, Unfiltered S/N, Filtered S/N and Buffered).

Changing the Sine Wave Frequency

Repeat using 1500Hz and 2000Hz.

Question: Does the input frequency of the Sine Wave have an effect on the accuracy of the algorithm? If it does, then it would be useful to put a digital filter at the input to the algorithm to limit the frequency band.

Sine wave 300 hz

Change the Sine Wave Frequency to 300Hz then run the model.

Questions & Answers

Difference between voluntary and non voluntary
Robert Reply
how possible science can explain natural occuring
David Reply
why qualitative method
David
using hypothetical examples from contemporary society discuss sociological imaginations
Orient Reply
Using Social Identity Theory, explain how group membership influences individual behavior and intergroup dynamics. Provide examples of how in-group favoritism and out-group bias manifest in real-world scenarios, such as in schools, workplaces, or communities. What strategies can be employed to mitigate negative intergroup behaviors rooted in social identity?
Adejumobi Reply
of course group membership can contribute in influencing an individual behaviour this is because when ever an individual associate with other group members he or she try to adopt their behaviour in one way or the other because human beings are very dynamic
Faiza
introduction to sociology
Hussain Reply
Sociology is the scientific study of the society. It's about studying man in groups at the complex form.
Prince
start new n questions too
Emmaunella Reply
Good evening everyone
JOE
what does secularization means
Munashe
summarize halerambos & holbon
David Reply
the Three stages of Auguste Comte
Clementina Reply
what are agents of socialization
Antonio Reply
socialazatio
Alkasim
sociology of education
Nuhu Reply
definition of sociology of education
Nuhu
definition of sociology of education
Emmaunella
what is culture
Abdulrahim Reply
shared beliefs, values, and practices
AI-Robot
What are the two type of scientific method
ogunniran Reply
I'm willing to join you
Aceng Reply
what are the scientific method of sociology
Man
what is socialization
ogunniran Reply
the process wherein people come to understand societal norms and expectations, to accept society's beliefs, and to be aware of societal values
AI-Robot
scientific method in doing research
ogunniran
defimition of sickness in afica
Anita
Cosmology
ogunniran
Hmmm
ogunniran
send
Alkasim
sendggg
Alkasim
list and explain the terms that found in society
REMMY Reply
list and explain the terms that found in society
Mukhtar
what are the agents of socialization
Antonio
Family Peer group Institution
Abdulwajud
I mean the definition
Antonio
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply
<< Chapter < Page Page > Chapter >>

Read also:

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play Download on the App Store Now




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