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| Author |
Message |
metacase
Guest
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| problem with code output |
 Posted: Tue Jan 27, 2009 2:10 pm |
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hi!
i'm making a 4 microphone array to recognize a source of sound, like voice.
The algorithm which returns the angle of the ubication of the source need the next function.
| Code: |
unsigned long dot_product(unsigned int mic1,unsigned int mic2, int desfase)
{
unsigned long p;
int i,j;
p = 0;
for(i=0;i<BUFFER_SIZE;i++){
j = (i + desfase + BUFFER_SIZE)%BUFFER_SIZE;
p = p + (unsigned long)(((buffer[4*i + mic1]>>2)*(buffer[4*j + mic2]>>2))>>5);
}
return p;
}
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note: BUFFER_SIZE=64
the problem is that i don't understand the meaning of the last line.
thanks! |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Jan 27, 2009 8:41 pm |
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Do you mean the last line in the calculations ?
Did you get this code from some webpage ? If so, post a link to the
webpage. |
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Guest
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| Posted: Wed Jan 28, 2009 7:41 am |
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| PCM programmer wrote: | Do you mean the last line in the calculations ?
Did you get this code from some webpage ? If so, post a link to the
webpage. |
yeah, the last line, i got the code from a student who did this project long time ago, at that time the project worked, but now is not working, so i have to fix it. |
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Ttelmah
Guest
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| Posted: Wed Jan 28, 2009 9:32 am |
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How is buffer declared?.
Was the code written in CCS C originally, or in another C?.
Best Wishes |
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Guest
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| Posted: Wed Jan 28, 2009 10:51 am |
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I have the answer:
it's a cross correlation between one signal from mic_1 and the other signal from mic_2.
thanks. |
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