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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.

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.

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

what does nano mean?
Anassong Reply
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Bharti
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Damian Reply
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Daniel
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Maciej
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s. Reply
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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.
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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
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Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
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
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s.
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SUYASH Reply
for screen printed electrodes ?
SUYASH
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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
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Cied
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how did you get the value of 2000N.What calculations are needed to arrive at it
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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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