I have recorded my audio by two hardware, PC and Microcontroller, I know the PC result are correct but my signal have some deficit. I have recorded by my PC and MCU my voice 6s 7812Hz and autocorrelation of each one become : Auto in case excitation being white noise: It seems in MCU we have summed with triangle signal in comparison with the PC signal autocorrelation.
White noise excitation cross-correlation (note both signal are recorded from one noise with small delay(PC have delay)):
I know what autocorrelation function is. Why mcu auto-corr has summed with triangle? Also two signal must be at some point highly correlated but its weird! what can be inferred?
Why cross correlation of white noises is not spike? Also note the end of cross being zero, it have zero tail, why?