need to do the AM-SSB
from the AM coding need to perform the following steps:
- Low-pass filter, to remove noise
- Modulate the signal again by the carrier frequency
- Pass through another filter, to remove high-frequency components
- Amplify the signal, because the previous steps have attenuated it significantly.
Can anyone help me...
Thank...
//AM.c AM using table for carrier and baseband signals
#include "DSK6713_AIC23.h" //codec-dsk support file
Uint32 fs=DSK6713_AIC23_FREQ_8KHZ; //set sampling rate
short amp = 1; //index for modulation
void main()
{
short baseband[20]={1000,951,809,587,309,0,-309,-587,-809,-951,
-1000,-951,-809,-587,-309,0,309,587,809,951}; //400-Hz baseband
short carrier[20] ={1000,0,-1000,0,1000,0,-1000,0,1000,0,
-1000,0,1000,0,-1000,0,1000,0,-1000,0}; //2-kHz carrier
short output[20];
short k;
comm_poll(); //init DSK, codec, McBSP
while(1) //infinite loop
{
for (k=0; k<20; k++)
{
output[k]= carrier[k] + ((amp*baseband[k]*carrier[k]/10)>>12);
output_sample(20*output[k]); //scale output
}
}
}
