Impulse response using TMS320C67XX/TMS320C6713 KIT 

Aim:To find the impulse response using TMS320C67XX/TMS320C6713 KIT

SOFTARE REQUIREMENTS:

Operating System – Windows XP

Constructor - Simulator

Software – Code Composer Studio3.1v,  6713DSK Diagnostics.

HARDARE REQUIREMENTS:

TMS320C6713DSP KIT  

USB cable  

Power Supply +5v 

Procedure:  

? Open code composer studio, make sure the DSP kit is turned on. Start a new project using ‘project-new’ pull down menu, save it in a separate directory (c:\ccstudio\myprojects) with the name ‘file name. pjt’.  

?   Add the source file of linear convolution to the project using ‘project-add files to project’ pull down menu.  

?   Add the linker command file ‘hello. cmd’(c\ccstudio\tutorials\dsk6713\hello1\hello.cmd)  

?   Add the run time support library file rts6700.lib (c-ccstudio\c6000\cgtools\lib\rts6700.lib)  

?   Compile program using the ‘project-compile’ pull down menu or by clicking the short cut icon on the left side of program window.  

?   Build the program using ‘project-build’ pull down menu or by clicking the icon on the left side of the program window.  

?   Load the program in program memory of DSP chip using the ‘file-load  program’ pull down menu.  

?  To view o/p graphically, select View -graph-time and frequency.  

Program  :

#include <stdio.h>  
#define Order 2     /*Order of the system*/
#define Len 10         /*Length of the output pulses*/
float y[Len]={0,0,0},sum;  
main()  
{  
int j,k;  
float a[Order+1]={0.1311, 0.2622, 0.1311};  
/* y coefficient may change in accordance with the difference equation */  

float b[Order+1]={1, -0.7478, 0.2722};
/* x coefficients may change in accordance with the difference equation */  

for(j=0;j<Len;j++)  
{  
sum=0;  
for(k=1;k<=Order;k++)  
{  
if((j-k)>=0)  
sum=sum+(b[k]*y[j-k]);
}
if(j<=Order)
{
y[j]=a[j]-sum;
}
else
{
y[j]=-sum;
}
printf("Respose[%d] = %f\n",j,y[j]);
}
}  

Precautions:  

?  Switch ON the computer only after connecting USB cable and make sure   the DSP kit is ON.  

?   Perform the diagnostic check before opening code composer studio.  

?   All the connections must be tight.  

Result : The impulse response is obtained and the graphs are plotted.

Viva questions:

1.  Define impulse response.  

2.  Give me one example for impulse response.  

3.  Write the Formula for impulse response.  

4.  What are major role in order & length?